Ignore lots and lots of std tests on emscripten

28 files changed, 255 insertions, 0 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index e3c92fc1aa8..29e18781ce2 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -1000,6 +1000,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn manually_share_arc() {
         let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
         let arc_v = Arc::new(v);
diff --git a/src/libcollections/linked_list.rs b/src/libcollections/linked_list.rs
index 690c4f4af35..67f3708a62b 100644
--- a/src/libcollections/linked_list.rs
+++ b/src/libcollections/linked_list.rs
@@ -1294,6 +1294,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_send() {
         let n = list_from(&[1, 2, 3]);
         thread::spawn(move || {
diff --git a/src/libcollectionstest/slice.rs b/src/libcollectionstest/slice.rs
index 5b341ab62d0..9580714075a 100644
--- a/src/libcollectionstest/slice.rs
+++ b/src/libcollectionstest/slice.rs
@@ -1116,6 +1116,7 @@ fn test_box_slice_clone() {
 }
 
 #[test]
+#[cfg_attr(target_os = "emscripten", ignore)]
 fn test_box_slice_clone_panics() {
     use std::sync::Arc;
     use std::sync::atomic::{AtomicUsize, Ordering};
diff --git a/src/libstd/env.rs b/src/libstd/env.rs
index 5da6e5a8b80..76a2f93c162 100644
--- a/src/libstd/env.rs
+++ b/src/libstd/env.rs
@@ -1033,6 +1033,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_var_big() {
         let mut s = "".to_string();
         let mut i = 0;
@@ -1046,6 +1047,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_self_exe_path() {
         let path = current_exe();
         assert!(path.is_ok());
@@ -1056,6 +1058,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_env_set_get_huge() {
         let n = make_rand_name();
         let s = repeat("x").take(10000).collect::<String>();
diff --git a/src/libstd/fs.rs b/src/libstd/fs.rs
index 576198564db..08d71c1d9f8 100644
--- a/src/libstd/fs.rs
+++ b/src/libstd/fs.rs
@@ -1745,6 +1745,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_io_smoke_test() {
         let message = "it's alright. have a good time";
         let tmpdir = tmpdir();
@@ -1766,6 +1767,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn invalid_path_raises() {
         let tmpdir = tmpdir();
         let filename = &tmpdir.join("file_that_does_not_exist.txt");
@@ -1780,6 +1782,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_iounlinking_invalid_path_should_raise_condition() {
         let tmpdir = tmpdir();
         let filename = &tmpdir.join("file_another_file_that_does_not_exist.txt");
@@ -1795,6 +1798,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_io_non_positional_read() {
         let message: &str = "ten-four";
         let mut read_mem = [0; 8];
@@ -1821,6 +1825,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_io_seek_and_tell_smoke_test() {
         let message = "ten-four";
         let mut read_mem = [0; 4];
@@ -1848,6 +1853,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_io_seek_and_write() {
         let initial_msg =   "food-is-yummy";
         let overwrite_msg =    "-the-bar!!";
@@ -1872,6 +1878,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_io_seek_shakedown() {
         //                   01234567890123
         let initial_msg =   "qwer-asdf-zxcv";
@@ -1904,6 +1911,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_stat_is_correct_on_is_file() {
         let tmpdir = tmpdir();
         let filename = &tmpdir.join("file_stat_correct_on_is_file.txt");
@@ -1925,6 +1933,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_stat_is_correct_on_is_dir() {
         let tmpdir = tmpdir();
         let filename = &tmpdir.join("file_stat_correct_on_is_dir");
@@ -1937,6 +1946,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_fileinfo_false_when_checking_is_file_on_a_directory() {
         let tmpdir = tmpdir();
         let dir = &tmpdir.join("fileinfo_false_on_dir");
@@ -1946,6 +1956,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_fileinfo_check_exists_before_and_after_file_creation() {
         let tmpdir = tmpdir();
         let file = &tmpdir.join("fileinfo_check_exists_b_and_a.txt");
@@ -1956,6 +1967,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_directoryinfo_check_exists_before_and_after_mkdir() {
         let tmpdir = tmpdir();
         let dir = &tmpdir.join("before_and_after_dir");
@@ -1968,6 +1980,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_test_directoryinfo_readdir() {
         let tmpdir = tmpdir();
         let dir = &tmpdir.join("di_readdir");
@@ -1997,6 +2010,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_create_new_already_exists_error() {
         let tmpdir = tmpdir();
         let file = &tmpdir.join("file_create_new_error_exists");
@@ -2006,6 +2020,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn mkdir_path_already_exists_error() {
         let tmpdir = tmpdir();
         let dir = &tmpdir.join("mkdir_error_twice");
@@ -2015,6 +2030,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recursive_mkdir() {
         let tmpdir = tmpdir();
         let dir = tmpdir.join("d1/d2");
@@ -2023,6 +2039,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recursive_mkdir_failure() {
         let tmpdir = tmpdir();
         let dir = tmpdir.join("d1");
@@ -2037,11 +2054,13 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recursive_mkdir_slash() {
         check!(fs::create_dir_all(&Path::new("/")));
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recursive_rmdir() {
         let tmpdir = tmpdir();
         let d1 = tmpdir.join("d1");
@@ -2061,6 +2080,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recursive_rmdir_of_symlink() {
         // test we do not recursively delete a symlink but only dirs.
         let tmpdir = tmpdir();
@@ -2094,6 +2114,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn unicode_path_is_dir() {
         assert!(Path::new(".").is_dir());
         assert!(!Path::new("test/stdtest/fs.rs").is_dir());
@@ -2113,6 +2134,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn unicode_path_exists() {
         assert!(Path::new(".").exists());
         assert!(!Path::new("test/nonexistent-bogus-path").exists());
@@ -2126,6 +2148,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_does_not_exist() {
         let from = Path::new("test/nonexistent-bogus-path");
         let to = Path::new("test/other-bogus-path");
@@ -2140,6 +2163,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_src_does_not_exist() {
         let tmpdir = tmpdir();
         let from = Path::new("test/nonexistent-bogus-path");
@@ -2153,6 +2177,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_ok() {
         let tmpdir = tmpdir();
         let input = tmpdir.join("in.txt");
@@ -2169,6 +2194,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_dst_dir() {
         let tmpdir = tmpdir();
         let out = tmpdir.join("out");
@@ -2180,6 +2206,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_dst_exists() {
         let tmpdir = tmpdir();
         let input = tmpdir.join("in");
@@ -2195,6 +2222,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_src_dir() {
         let tmpdir = tmpdir();
         let out = tmpdir.join("out");
@@ -2206,6 +2234,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn copy_file_preserves_perm_bits() {
         let tmpdir = tmpdir();
         let input = tmpdir.join("in.txt");
@@ -2234,6 +2263,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn symlinks_work() {
         let tmpdir = tmpdir();
         if !got_symlink_permission(&tmpdir) { return };
@@ -2252,6 +2282,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn symlink_noexist() {
         // Symlinks can point to things that don't exist
         let tmpdir = tmpdir();
@@ -2265,6 +2296,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn read_link() {
         if cfg!(windows) {
             // directory symlink
@@ -2285,6 +2317,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn readlink_not_symlink() {
         let tmpdir = tmpdir();
         match fs::read_link(tmpdir.path()) {
@@ -2294,6 +2327,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn links_work() {
         let tmpdir = tmpdir();
         let input = tmpdir.join("in.txt");
@@ -2322,6 +2356,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn chmod_works() {
         let tmpdir = tmpdir();
         let file = tmpdir.join("in.txt");
@@ -2345,6 +2380,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn sync_doesnt_kill_anything() {
         let tmpdir = tmpdir();
         let path = tmpdir.join("in.txt");
@@ -2358,6 +2394,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn truncate_works() {
         let tmpdir = tmpdir();
         let path = tmpdir.join("in.txt");
@@ -2392,6 +2429,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn open_flavors() {
         use fs::OpenOptions as OO;
         fn c<T: Clone>(t: &T) -> T { t.clone() }
@@ -2511,6 +2549,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn binary_file() {
         let mut bytes = [0; 1024];
         StdRng::new().unwrap().fill_bytes(&mut bytes);
@@ -2524,6 +2563,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn file_try_clone() {
         let tmpdir = tmpdir();
 
@@ -2546,6 +2586,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     #[cfg(not(windows))]
     fn unlink_readonly() {
         let tmpdir = tmpdir();
@@ -2558,6 +2599,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn mkdir_trailing_slash() {
         let tmpdir = tmpdir();
         let path = tmpdir.join("file");
@@ -2565,6 +2607,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn canonicalize_works_simple() {
         let tmpdir = tmpdir();
         let tmpdir = fs::canonicalize(tmpdir.path()).unwrap();
@@ -2574,6 +2617,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn realpath_works() {
         let tmpdir = tmpdir();
         if !got_symlink_permission(&tmpdir) { return };
@@ -2599,6 +2643,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn realpath_works_tricky() {
         let tmpdir = tmpdir();
         if !got_symlink_permission(&tmpdir) { return };
@@ -2628,6 +2673,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn dir_entry_methods() {
         let tmpdir = tmpdir();
 
@@ -2662,12 +2708,14 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn read_dir_not_found() {
         let res = fs::read_dir("/path/that/does/not/exist");
         assert_eq!(res.err().unwrap().kind(), ErrorKind::NotFound);
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn create_dir_all_with_junctions() {
         let tmpdir = tmpdir();
         let target = tmpdir.join("target");
@@ -2695,6 +2743,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn metadata_access_times() {
         let tmpdir = tmpdir();
 
diff --git a/src/libstd/io/buffered.rs b/src/libstd/io/buffered.rs
index 4ff8c6ac128..21a0cc1fb3b 100644
--- a/src/libstd/io/buffered.rs
+++ b/src/libstd/io/buffered.rs
@@ -1107,6 +1107,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn panic_in_write_doesnt_flush_in_drop() {
         static WRITES: AtomicUsize = AtomicUsize::new(0);
 
diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 0de02cbf19c..2ba2e8de71b 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1761,6 +1761,7 @@ mod tests {
     use super::repeat;
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn read_until() {
         let mut buf = Cursor::new(&b"12"[..]);
         let mut v = Vec::new();
@@ -1971,6 +1972,7 @@ mod tests {
     }
 
     #[bench]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn bench_read_to_end(b: &mut test::Bencher) {
         b.iter(|| {
             let mut lr = repeat(1).take(10000000);
diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index 9a782e95f6e..89cb9909956 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -668,6 +668,7 @@ mod tests {
     use super::*;
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn panic_doesnt_poison() {
         thread::spawn(|| {
             let _a = stdin();
diff --git a/src/libstd/net/addr.rs b/src/libstd/net/addr.rs
index d0b59b42c17..930f2c721a7 100644
--- a/src/libstd/net/addr.rs
+++ b/src/libstd/net/addr.rs
@@ -533,6 +533,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn to_socket_addr_str_u16() {
         let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
         assert_eq!(Ok(vec![a]), tsa(("77.88.21.11", 24352)));
@@ -545,6 +546,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn to_socket_addr_str() {
         let a = sa4(Ipv4Addr::new(77, 88, 21, 11), 24352);
         assert_eq!(Ok(vec![a]), tsa("77.88.21.11:24352"));
@@ -559,6 +561,7 @@ mod tests {
     // FIXME: figure out why this fails on openbsd and bitrig and fix it
     #[test]
     #[cfg(not(any(windows, target_os = "openbsd", target_os = "bitrig")))]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn to_socket_addr_str_bad() {
         assert!(tsa("1200::AB00:1234::2552:7777:1313:34300").is_err());
     }
diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index 3c5f07c3e33..d34fce2be43 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -454,6 +454,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn bind_error() {
         match TcpListener::bind("1.1.1.1:9999") {
             Ok(..) => panic!(),
@@ -463,6 +464,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn connect_error() {
         match TcpStream::connect("0.0.0.0:1") {
             Ok(..) => panic!(),
@@ -475,6 +477,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn listen_localhost() {
         let socket_addr = next_test_ip4();
         let listener = t!(TcpListener::bind(&socket_addr));
@@ -492,6 +495,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn connect_loopback() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -513,6 +517,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke_test() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -533,6 +538,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn read_eof() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -552,6 +558,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn write_close() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -578,6 +585,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn multiple_connect_serial() {
         each_ip(&mut |addr| {
             let max = 10;
@@ -600,6 +608,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn multiple_connect_interleaved_greedy_schedule() {
         const MAX: usize = 10;
         each_ip(&mut |addr| {
@@ -635,6 +644,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn multiple_connect_interleaved_lazy_schedule() {
         const MAX: usize = 10;
         each_ip(&mut |addr| {
@@ -668,6 +678,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn socket_and_peer_name() {
         each_ip(&mut |addr| {
             let listener = t!(TcpListener::bind(&addr));
@@ -683,6 +694,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn partial_read() {
         each_ip(&mut |addr| {
             let (tx, rx) = channel();
@@ -704,6 +716,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn double_bind() {
         each_ip(&mut |addr| {
             let _listener = t!(TcpListener::bind(&addr));
@@ -720,6 +733,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn fast_rebind() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -735,6 +749,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn tcp_clone_smoke() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -766,6 +781,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn tcp_clone_two_read() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -800,6 +816,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn tcp_clone_two_write() {
         each_ip(&mut |addr| {
             let acceptor = t!(TcpListener::bind(&addr));
@@ -827,6 +844,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn shutdown_smoke() {
         each_ip(&mut |addr| {
             let a = t!(TcpListener::bind(&addr));
@@ -847,6 +865,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn close_readwrite_smoke() {
         each_ip(&mut |addr| {
             let a = t!(TcpListener::bind(&addr));
@@ -885,6 +904,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn close_read_wakes_up() {
         each_ip(&mut |addr| {
             let a = t!(TcpListener::bind(&addr));
@@ -912,6 +932,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn clone_while_reading() {
         each_ip(&mut |addr| {
             let accept = t!(TcpListener::bind(&addr));
@@ -952,6 +973,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn clone_accept_smoke() {
         each_ip(&mut |addr| {
             let a = t!(TcpListener::bind(&addr));
@@ -970,6 +992,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn clone_accept_concurrent() {
         each_ip(&mut |addr| {
             let a = t!(TcpListener::bind(&addr));
@@ -998,6 +1021,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn debug() {
         let name = if cfg!(windows) {"socket"} else {"fd"};
         let socket_addr = next_test_ip4();
@@ -1024,6 +1048,7 @@ mod tests {
     //        no longer has rounding errors.
     #[cfg_attr(any(target_os = "bitrig", target_os = "netbsd", target_os = "openbsd"), ignore)]
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn timeouts() {
         let addr = next_test_ip4();
         let listener = t!(TcpListener::bind(&addr));
@@ -1050,6 +1075,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_timeout() {
         let addr = next_test_ip4();
         let listener = t!(TcpListener::bind(&addr));
@@ -1066,6 +1092,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_with_timeout() {
         let addr = next_test_ip4();
         let listener = t!(TcpListener::bind(&addr));
@@ -1088,6 +1115,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn nodelay() {
         let addr = next_test_ip4();
         let _listener = t!(TcpListener::bind(&addr));
@@ -1102,6 +1130,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn ttl() {
         let ttl = 100;
 
@@ -1118,6 +1147,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn set_nonblocking() {
         let addr = next_test_ip4();
         let listener = t!(TcpListener::bind(&addr));
diff --git a/src/libstd/net/udp.rs b/src/libstd/net/udp.rs
index 781f026c12c..7315b6aaeb6 100644
--- a/src/libstd/net/udp.rs
+++ b/src/libstd/net/udp.rs
@@ -378,6 +378,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn bind_error() {
         match UdpSocket::bind("1.1.1.1:9999") {
             Ok(..) => panic!(),
@@ -388,6 +389,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn socket_smoke_test_ip4() {
         each_ip(&mut |server_ip, client_ip| {
             let (tx1, rx1) = channel();
@@ -412,6 +414,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn socket_name_ip4() {
         each_ip(&mut |addr, _| {
             let server = t!(UdpSocket::bind(&addr));
@@ -420,6 +423,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn udp_clone_smoke() {
         each_ip(&mut |addr1, addr2| {
             let sock1 = t!(UdpSocket::bind(&addr1));
@@ -449,6 +453,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn udp_clone_two_read() {
         each_ip(&mut |addr1, addr2| {
             let sock1 = t!(UdpSocket::bind(&addr1));
@@ -481,6 +486,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn udp_clone_two_write() {
         each_ip(&mut |addr1, addr2| {
             let sock1 = t!(UdpSocket::bind(&addr1));
@@ -519,6 +525,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn debug() {
         let name = if cfg!(windows) {"socket"} else {"fd"};
         let socket_addr = next_test_ip4();
@@ -534,6 +541,7 @@ mod tests {
     //        no longer has rounding errors.
     #[cfg_attr(any(target_os = "bitrig", target_os = "netbsd", target_os = "openbsd"), ignore)]
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn timeouts() {
         let addr = next_test_ip4();
 
@@ -558,6 +566,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_timeout() {
         let addr = next_test_ip4();
 
@@ -573,6 +582,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_with_timeout() {
         let addr = next_test_ip4();
 
@@ -592,6 +602,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn connect_send_recv() {
         let addr = next_test_ip4();
 
@@ -606,6 +617,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn ttl() {
         let ttl = 100;
 
@@ -618,6 +630,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn set_nonblocking() {
         let addr = next_test_ip4();
 
diff --git a/src/libstd/process.rs b/src/libstd/process.rs
index f0c44430700..233a4d3639c 100644
--- a/src/libstd/process.rs
+++ b/src/libstd/process.rs
@@ -819,6 +819,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke() {
         let p = Command::new("true").spawn();
         assert!(p.is_ok());
@@ -837,6 +838,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn exit_reported_right() {
         let p = Command::new("false").spawn();
         assert!(p.is_ok());
@@ -848,6 +850,7 @@ mod tests {
     #[test]
     #[cfg(unix)]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn signal_reported_right() {
         use os::unix::process::ExitStatusExt;
 
@@ -876,6 +879,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stdout_works() {
         let mut cmd = Command::new("echo");
         cmd.arg("foobar").stdout(Stdio::piped());
@@ -884,6 +888,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(any(windows, target_os = "android"), ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn set_current_dir_works() {
         let mut cmd = Command::new("/bin/sh");
         cmd.arg("-c").arg("pwd")
@@ -894,6 +899,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(any(windows, target_os = "android"), ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stdin_works() {
         let mut p = Command::new("/bin/sh")
                             .arg("-c").arg("read line; echo $line")
@@ -912,6 +918,7 @@ mod tests {
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
     #[cfg(unix)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn uid_works() {
         use os::unix::prelude::*;
         use libc;
@@ -938,6 +945,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_status() {
         let mut status = Command::new("false").status().unwrap();
         assert!(status.code() == Some(1));
@@ -947,6 +955,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_output_fail_to_start() {
         match Command::new("/no-binary-by-this-name-should-exist").output() {
             Err(e) => assert_eq!(e.kind(), ErrorKind::NotFound),
@@ -956,6 +965,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_output_output() {
         let Output {status, stdout, stderr}
              = Command::new("echo").arg("hello").output().unwrap();
@@ -968,6 +978,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_output_error() {
         let Output {status, stdout, stderr}
              = Command::new("mkdir").arg(".").output().unwrap();
@@ -979,6 +990,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_finish_once() {
         let mut prog = Command::new("false").spawn().unwrap();
         assert!(prog.wait().unwrap().code() == Some(1));
@@ -986,6 +998,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_finish_twice() {
         let mut prog = Command::new("false").spawn().unwrap();
         assert!(prog.wait().unwrap().code() == Some(1));
@@ -994,6 +1007,7 @@ mod tests {
 
     #[test]
     #[cfg_attr(target_os = "android", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_wait_with_output_once() {
         let prog = Command::new("echo").arg("hello").stdout(Stdio::piped())
             .spawn().unwrap();
@@ -1024,6 +1038,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_inherit_env() {
         use env;
 
@@ -1049,6 +1064,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_override_env() {
         use env;
 
@@ -1069,6 +1085,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_add_to_env() {
         let result = env_cmd().env("RUN_TEST_NEW_ENV", "123").output().unwrap();
         let output = String::from_utf8_lossy(&result.stdout).to_string();
diff --git a/src/libstd/rand/mod.rs b/src/libstd/rand/mod.rs
index 3f14fcd239f..69cd37651d5 100644
--- a/src/libstd/rand/mod.rs
+++ b/src/libstd/rand/mod.rs
@@ -242,6 +242,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_os_rng_tasks() {
 
         let mut txs = vec!();
diff --git a/src/libstd/sync/barrier.rs b/src/libstd/sync/barrier.rs
index ac0f400379e..f46eab68484 100644
--- a/src/libstd/sync/barrier.rs
+++ b/src/libstd/sync/barrier.rs
@@ -118,6 +118,7 @@ mod tests {
     use thread;
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_barrier() {
         const N: usize = 10;
 
diff --git a/src/libstd/sync/condvar.rs b/src/libstd/sync/condvar.rs
index 3db8b05b954..a983ae716a4 100644
--- a/src/libstd/sync/condvar.rs
+++ b/src/libstd/sync/condvar.rs
@@ -270,6 +270,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn notify_one() {
         let m = Arc::new(Mutex::new(()));
         let m2 = m.clone();
@@ -286,6 +287,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn notify_all() {
         const N: usize = 10;
 
@@ -322,6 +324,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn wait_timeout_ms() {
         let m = Arc::new(Mutex::new(()));
         let m2 = m.clone();
@@ -343,6 +346,7 @@ mod tests {
 
     #[test]
     #[should_panic]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn two_mutexes() {
         let m = Arc::new(Mutex::new(()));
         let m2 = m.clone();
diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index 3d9f81413dc..b8101ae85cf 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -1314,6 +1314,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke_threads() {
         let (tx, rx) = channel::<i32>();
         let _t = thread::spawn(move|| {
@@ -1346,6 +1347,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn port_gone_concurrent() {
         let (tx, rx) = channel::<i32>();
         let _t = thread::spawn(move|| {
@@ -1355,6 +1357,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn port_gone_concurrent_shared() {
         let (tx, rx) = channel::<i32>();
         let tx2 = tx.clone();
@@ -1381,6 +1384,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn chan_gone_concurrent() {
         let (tx, rx) = channel::<i32>();
         let _t = thread::spawn(move|| {
@@ -1391,6 +1395,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress() {
         let (tx, rx) = channel::<i32>();
         let t = thread::spawn(move|| {
@@ -1403,6 +1408,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_shared() {
         const AMT: u32 = 10000;
         const NTHREADS: u32 = 8;
@@ -1429,6 +1435,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn send_from_outside_runtime() {
         let (tx1, rx1) = channel::<()>();
         let (tx2, rx2) = channel::<i32>();
@@ -1449,6 +1456,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn recv_from_outside_runtime() {
         let (tx, rx) = channel::<i32>();
         let t = thread::spawn(move|| {
@@ -1463,6 +1471,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn no_runtime() {
         let (tx1, rx1) = channel::<i32>();
         let (tx2, rx2) = channel::<i32>();
@@ -1501,6 +1510,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_single_thread_recv_chan_close() {
         // Receiving on a closed chan will panic
         let res = thread::spawn(move|| {
@@ -1570,6 +1580,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_task_recv_then_send() {
         let (tx, rx) = channel::<Box<i32>>();
         let _t = thread::spawn(move|| {
@@ -1580,6 +1591,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_task_recv_then_close() {
         let (tx, rx) = channel::<Box<i32>>();
         let _t = thread::spawn(move|| {
@@ -1592,6 +1604,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = channel::<i32>();
@@ -1603,6 +1616,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_send_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = channel::<i32>();
@@ -1616,6 +1630,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_recv_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = channel::<i32>();
@@ -1634,6 +1649,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_send_recv_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = channel::<Box<isize>>();
@@ -1645,6 +1661,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stream_send_recv_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = channel();
@@ -1683,6 +1700,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_recv_timeout_two_threads() {
         let (tx, rx) = channel();
         let stress = stress_factor() + 100;
@@ -1724,6 +1742,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_recv_timeout_shared() {
         let (tx, rx) = channel();
         let stress = stress_factor() + 100;
@@ -1762,6 +1781,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn shared_recv_timeout() {
         let (tx, rx) = channel();
         let total = 5;
@@ -1780,6 +1800,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn shared_chan_stress() {
         let (tx, rx) = channel();
         let total = stress_factor() + 100;
@@ -1796,6 +1817,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_nested_recv_iter() {
         let (tx, rx) = channel::<i32>();
         let (total_tx, total_rx) = channel::<i32>();
@@ -1816,6 +1838,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_recv_iter_break() {
         let (tx, rx) = channel::<i32>();
         let (count_tx, count_rx) = channel();
@@ -1841,6 +1864,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_recv_try_iter() {
         let (request_tx, request_rx) = channel();
         let (response_tx, response_rx) = channel();
@@ -1895,6 +1919,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn try_recv_states() {
         let (tx1, rx1) = channel::<i32>();
         let (tx2, rx2) = channel::<()>();
@@ -1921,6 +1946,7 @@ mod tests {
     // This bug used to end up in a livelock inside of the Receiver destructor
     // because the internal state of the Shared packet was corrupted
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn destroy_upgraded_shared_port_when_sender_still_active() {
         let (tx, rx) = channel();
         let (tx2, rx2) = channel();
@@ -1988,6 +2014,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke_threads() {
         let (tx, rx) = sync_channel::<i32>(0);
         let _t = thread::spawn(move|| {
@@ -2013,6 +2040,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn port_gone_concurrent() {
         let (tx, rx) = sync_channel::<i32>(0);
         let _t = thread::spawn(move|| {
@@ -2022,6 +2050,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn port_gone_concurrent_shared() {
         let (tx, rx) = sync_channel::<i32>(0);
         let tx2 = tx.clone();
@@ -2048,6 +2077,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn chan_gone_concurrent() {
         let (tx, rx) = sync_channel::<i32>(0);
         thread::spawn(move|| {
@@ -2058,6 +2088,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress() {
         let (tx, rx) = sync_channel::<i32>(0);
         thread::spawn(move|| {
@@ -2069,6 +2100,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_recv_timeout_two_threads() {
         let (tx, rx) = sync_channel::<i32>(0);
 
@@ -2092,6 +2124,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_recv_timeout_shared() {
         const AMT: u32 = 1000;
         const NTHREADS: u32 = 8;
@@ -2130,6 +2163,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress_shared() {
         const AMT: u32 = 1000;
         const NTHREADS: u32 = 8;
@@ -2180,6 +2214,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_single_thread_recv_chan_close() {
         // Receiving on a closed chan will panic
         let res = thread::spawn(move|| {
@@ -2264,6 +2299,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_task_recv_then_send() {
         let (tx, rx) = sync_channel::<Box<i32>>(0);
         let _t = thread::spawn(move|| {
@@ -2274,6 +2310,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_task_recv_then_close() {
         let (tx, rx) = sync_channel::<Box<i32>>(0);
         let _t = thread::spawn(move|| {
@@ -2286,6 +2323,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = sync_channel::<i32>(0);
@@ -2297,6 +2335,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_send_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = sync_channel::<i32>(0);
@@ -2310,6 +2349,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_recv_close_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = sync_channel::<i32>(0);
@@ -2328,6 +2368,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_multi_thread_send_recv_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = sync_channel::<Box<i32>>(0);
@@ -2339,6 +2380,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stream_send_recv_stress() {
         for _ in 0..stress_factor() {
             let (tx, rx) = sync_channel::<Box<i32>>(0);
@@ -2375,6 +2417,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn shared_chan_stress() {
         let (tx, rx) = sync_channel(0);
         let total = stress_factor() + 100;
@@ -2391,6 +2434,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_nested_recv_iter() {
         let (tx, rx) = sync_channel::<i32>(0);
         let (total_tx, total_rx) = sync_channel::<i32>(0);
@@ -2411,6 +2455,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_recv_iter_break() {
         let (tx, rx) = sync_channel::<i32>(0);
         let (count_tx, count_rx) = sync_channel(0);
@@ -2436,6 +2481,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn try_recv_states() {
         let (tx1, rx1) = sync_channel::<i32>(1);
         let (tx2, rx2) = sync_channel::<()>(1);
@@ -2462,6 +2508,7 @@ mod sync_tests {
     // This bug used to end up in a livelock inside of the Receiver destructor
     // because the internal state of the Shared packet was corrupted
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn destroy_upgraded_shared_port_when_sender_still_active() {
         let (tx, rx) = sync_channel::<()>(0);
         let (tx2, rx2) = sync_channel::<()>(0);
@@ -2483,6 +2530,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn send1() {
         let (tx, rx) = sync_channel::<i32>(0);
         let _t = thread::spawn(move|| { rx.recv().unwrap(); });
@@ -2490,6 +2538,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn send2() {
         let (tx, rx) = sync_channel::<i32>(0);
         let _t = thread::spawn(move|| { drop(rx); });
@@ -2497,6 +2546,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn send3() {
         let (tx, rx) = sync_channel::<i32>(1);
         assert_eq!(tx.send(1), Ok(()));
@@ -2505,6 +2555,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn send4() {
         let (tx, rx) = sync_channel::<i32>(0);
         let tx2 = tx.clone();
@@ -2545,6 +2596,7 @@ mod sync_tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn issue_15761() {
         fn repro() {
             let (tx1, rx1) = sync_channel::<()>(3);
diff --git a/src/libstd/sync/mpsc/mpsc_queue.rs b/src/libstd/sync/mpsc/mpsc_queue.rs
index d926043fbbc..2ff9ffe6d08 100644
--- a/src/libstd/sync/mpsc/mpsc_queue.rs
+++ b/src/libstd/sync/mpsc/mpsc_queue.rs
@@ -161,6 +161,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test() {
         let nthreads = 8;
         let nmsgs = 1000;
diff --git a/src/libstd/sync/mpsc/select.rs b/src/libstd/sync/mpsc/select.rs
index 51b08bd75c4..3058282edf3 100644
--- a/src/libstd/sync/mpsc/select.rs
+++ b/src/libstd/sync/mpsc/select.rs
@@ -444,6 +444,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn unblocks() {
         let (tx1, rx1) = channel::<i32>();
         let (_tx2, rx2) = channel::<i32>();
@@ -468,6 +469,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn both_ready() {
         let (tx1, rx1) = channel::<i32>();
         let (tx2, rx2) = channel::<i32>();
@@ -494,6 +496,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress() {
         const AMT: i32 = 10000;
         let (tx1, rx1) = channel::<i32>();
@@ -521,6 +524,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn cloning() {
         let (tx1, rx1) = channel::<i32>();
         let (_tx2, rx2) = channel::<i32>();
@@ -543,6 +547,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn cloning2() {
         let (tx1, rx1) = channel::<i32>();
         let (_tx2, rx2) = channel::<i32>();
@@ -565,6 +570,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn cloning3() {
         let (tx1, rx1) = channel::<()>();
         let (tx2, rx2) = channel::<()>();
@@ -682,6 +688,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn oneshot_data_waiting() {
         let (tx1, rx1) = channel();
         let (tx2, rx2) = channel();
@@ -698,6 +705,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stream_data_waiting() {
         let (tx1, rx1) = channel();
         let (tx2, rx2) = channel();
@@ -718,6 +726,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn shared_data_waiting() {
         let (tx1, rx1) = channel();
         let (tx2, rx2) = channel();
@@ -746,6 +755,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn sync2() {
         let (tx, rx) = sync_channel::<i32>(0);
         let _t = thread::spawn(move|| {
@@ -758,6 +768,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn sync3() {
         let (tx1, rx1) = sync_channel::<i32>(0);
         let (tx2, rx2): (Sender<i32>, Receiver<i32>) = channel();
diff --git a/src/libstd/sync/mpsc/spsc_queue.rs b/src/libstd/sync/mpsc/spsc_queue.rs
index 724d7b1be73..cb9577f155e 100644
--- a/src/libstd/sync/mpsc/spsc_queue.rs
+++ b/src/libstd/sync/mpsc/spsc_queue.rs
@@ -305,6 +305,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stress() {
         unsafe {
             stress_bound(0);
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index 098a3e44258..07d60f0610f 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -375,6 +375,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn lots_and_lots() {
         const J: u32 = 1000;
         const K: u32 = 3;
@@ -435,6 +436,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_into_inner_poison() {
         let m = Arc::new(Mutex::new(NonCopy(10)));
         let m2 = m.clone();
@@ -458,6 +460,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_get_mut_poison() {
         let m = Arc::new(Mutex::new(NonCopy(10)));
         let m2 = m.clone();
@@ -474,6 +477,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_mutex_arc_condvar() {
         let packet = Packet(Arc::new((Mutex::new(false), Condvar::new())));
         let packet2 = Packet(packet.0.clone());
@@ -497,6 +501,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_arc_condvar_poison() {
         let packet = Packet(Arc::new((Mutex::new(1), Condvar::new())));
         let packet2 = Packet(packet.0.clone());
@@ -526,6 +531,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_mutex_arc_poison() {
         let arc = Arc::new(Mutex::new(1));
         assert!(!arc.is_poisoned());
@@ -539,6 +545,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_mutex_arc_nested() {
         // Tests nested mutexes and access
         // to underlying data.
@@ -555,6 +562,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_mutex_arc_access_in_unwind() {
         let arc = Arc::new(Mutex::new(1));
         let arc2 = arc.clone();
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index 86d2986959c..64c3e2bb42f 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -385,6 +385,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn stampede_once() {
         static O: Once = Once::new();
         static mut run: bool = false;
@@ -447,6 +448,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn wait_for_force_to_finish() {
         static O: Once = Once::new();
 
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index 7f053c6704b..cb46b694f37 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -403,6 +403,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn frob() {
         const N: usize = 10;
         const M: usize = 1000;
@@ -430,6 +431,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc_poison_wr() {
         let arc = Arc::new(RwLock::new(1));
         let arc2 = arc.clone();
@@ -441,6 +443,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc_poison_ww() {
         let arc = Arc::new(RwLock::new(1));
         assert!(!arc.is_poisoned());
@@ -454,6 +457,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc_no_poison_rr() {
         let arc = Arc::new(RwLock::new(1));
         let arc2 = arc.clone();
@@ -465,6 +469,7 @@ mod tests {
         assert_eq!(*lock, 1);
     }
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc_no_poison_rw() {
         let arc = Arc::new(RwLock::new(1));
         let arc2 = arc.clone();
@@ -477,6 +482,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc() {
         let arc = Arc::new(RwLock::new(0));
         let arc2 = arc.clone();
@@ -515,6 +521,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_rw_arc_access_in_unwind() {
         let arc = Arc::new(RwLock::new(1));
         let arc2 = arc.clone();
@@ -587,6 +594,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_into_inner_poison() {
         let m = Arc::new(RwLock::new(NonCopy(10)));
         let m2 = m.clone();
@@ -610,6 +618,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_get_mut_poison() {
         let m = Arc::new(RwLock::new(NonCopy(10)));
         let m2 = m.clone();
diff --git a/src/libstd/sys/common/io.rs b/src/libstd/sys/common/io.rs
index 3cd70eddb85..2778ed9326c 100644
--- a/src/libstd/sys/common/io.rs
+++ b/src/libstd/sys/common/io.rs
@@ -165,6 +165,7 @@ mod tests {
     }
 
     #[bench]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn bench_uninitialized(b: &mut ::test::Bencher) {
         b.iter(|| {
             let mut lr = repeat(1).take(10000000);
diff --git a/src/libstd/sys/common/remutex.rs b/src/libstd/sys/common/remutex.rs
index cbdeaad7f6b..4935afe6afc 100644
--- a/src/libstd/sys/common/remutex.rs
+++ b/src/libstd/sys/common/remutex.rs
@@ -181,6 +181,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn is_mutex() {
         let m = Arc::new(ReentrantMutex::new(RefCell::new(0)));
         let m2 = m.clone();
@@ -198,6 +199,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn trylock_works() {
         let m = Arc::new(ReentrantMutex::new(()));
         let m2 = m.clone();
@@ -218,6 +220,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn poison_works() {
         let m = Arc::new(ReentrantMutex::new(RefCell::new(0)));
         let mc = m.clone();
diff --git a/src/libstd/sys/unix/ext/net.rs b/src/libstd/sys/unix/ext/net.rs
index 3f93fce1935..8224696db2f 100644
--- a/src/libstd/sys/unix/ext/net.rs
+++ b/src/libstd/sys/unix/ext/net.rs
@@ -806,6 +806,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn basic() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -834,6 +835,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn pair() {
         let msg1 = b"hello";
         let msg2 = b"world!";
@@ -857,6 +859,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn try_clone() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -883,6 +886,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn iter() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -905,6 +909,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn long_path() {
         let dir = tmpdir();
         let socket_path = dir.path()
@@ -930,6 +935,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn timeouts() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -957,6 +963,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_timeout() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -972,6 +979,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_read_with_timeout() {
         let dir = tmpdir();
         let socket_path = dir.path().join("sock");
@@ -993,6 +1001,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_unix_datagram() {
         let dir = tmpdir();
         let path1 = dir.path().join("sock1");
@@ -1009,6 +1018,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_unnamed_unix_datagram() {
         let dir = tmpdir();
         let path1 = dir.path().join("sock1");
@@ -1026,6 +1036,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_connect_unix_datagram() {
         let dir = tmpdir();
         let path1 = dir.path().join("sock1");
@@ -1052,6 +1063,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_unix_datagram_recv() {
         let dir = tmpdir();
         let path1 = dir.path().join("sock1");
@@ -1069,6 +1081,7 @@ mod test {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn datagram_pair() {
         let msg1 = b"hello";
         let msg2 = b"world!";
diff --git a/src/libstd/sys/unix/process.rs b/src/libstd/sys/unix/process.rs
index 50014f51f6c..85aba4b9b15 100644
--- a/src/libstd/sys/unix/process.rs
+++ b/src/libstd/sys/unix/process.rs
@@ -630,6 +630,7 @@ mod tests {
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
     #[cfg_attr(target_os = "nacl", ignore)] // no signals on NaCl.
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_process_mask() {
         unsafe {
             // Test to make sure that a signal mask does not get inherited.
diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index c44dee49f14..59748b47d81 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -541,6 +541,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke_no_dtor() {
         thread_local!(static FOO: Cell<i32> = Cell::new(1));
 
@@ -563,6 +564,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn states() {
         struct Foo;
         impl Drop for Foo {
@@ -586,6 +588,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn smoke_dtor() {
         thread_local!(static FOO: UnsafeCell<Option<Foo>> = UnsafeCell::new(None));
 
@@ -600,6 +603,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn circular() {
         struct S1;
         struct S2;
@@ -640,6 +644,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn self_referential() {
         struct S1;
         thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
@@ -661,6 +666,7 @@ mod tests {
     // test on OSX.
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn dtors_in_dtors_in_dtors() {
         struct S1(Sender<()>);
         thread_local!(static K1: UnsafeCell<Option<S1>> = UnsafeCell::new(None));
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index d8e021bb04f..b42a0fa3ac1 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -755,6 +755,7 @@ mod tests {
     // !!! instead of exiting cleanly. This might wedge the buildbots.       !!!
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_unnamed_thread() {
         thread::spawn(move|| {
             assert!(thread::current().name().is_none());
@@ -762,6 +763,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_named_thread() {
         Builder::new().name("ada lovelace".to_string()).spawn(move|| {
             assert!(thread::current().name().unwrap() == "ada lovelace".to_string());
@@ -770,11 +772,13 @@ mod tests {
 
     #[test]
     #[should_panic]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_invalid_named_thread() {
         let _ = Builder::new().name("ada l\0velace".to_string()).spawn(|| {});
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_run_basic() {
         let (tx, rx) = channel();
         thread::spawn(move|| {
@@ -784,6 +788,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_join_panic() {
         match thread::spawn(move|| {
             panic!()
@@ -794,6 +799,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_spawn_sched() {
         let (tx, rx) = channel();
 
@@ -813,6 +819,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_spawn_sched_childs_on_default_sched() {
         let (tx, rx) = channel();
 
@@ -841,6 +848,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_avoid_copying_the_body_spawn() {
         avoid_copying_the_body(|v| {
             thread::spawn(move || v());
@@ -848,6 +856,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_avoid_copying_the_body_thread_spawn() {
         avoid_copying_the_body(|f| {
             thread::spawn(move|| {
@@ -857,6 +866,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_avoid_copying_the_body_join() {
         avoid_copying_the_body(|f| {
             let _ = thread::spawn(move|| {
@@ -866,6 +876,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_child_doesnt_ref_parent() {
         // If the child refcounts the parent thread, this will stack overflow when
         // climbing the thread tree to dereference each ancestor. (See #1789)
@@ -883,11 +894,13 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_simple_newsched_spawn() {
         thread::spawn(move || {});
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_try_panic_message_static_str() {
         match thread::spawn(move|| {
             panic!("static string");
@@ -902,6 +915,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_try_panic_message_owned_str() {
         match thread::spawn(move|| {
             panic!("owned string".to_string());
@@ -916,6 +930,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_try_panic_message_any() {
         match thread::spawn(move|| {
             panic!(box 413u16 as Box<Any + Send>);
@@ -932,6 +947,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_try_panic_message_unit_struct() {
         struct Juju;
 
@@ -944,6 +960,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_park_timeout_unpark_before() {
         for _ in 0..10 {
             thread::current().unpark();
@@ -952,6 +969,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_park_timeout_unpark_not_called() {
         for _ in 0..10 {
             thread::park_timeout(Duration::from_millis(10));
@@ -959,6 +977,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
     fn test_park_timeout_unpark_called_other_thread() {
         for _ in 0..10 {
             let th = thread::current();