Fix std tests for wasm32-wasip2 target

29 files changed, 125 insertions, 45 deletions

diff --git a/library/std/src/collections/hash/map/tests.rs b/library/std/src/collections/hash/map/tests.rs
index c28dd7b6b50..2599060ef62 100644
--- a/library/std/src/collections/hash/map/tests.rs
+++ b/library/std/src/collections/hash/map/tests.rs
@@ -1018,6 +1018,7 @@ mod test_extract_if {
     }
 
     #[test]
+    #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
     fn drop_panic_leak() {
         static PREDS: AtomicUsize = AtomicUsize::new(0);
         static DROPS: AtomicUsize = AtomicUsize::new(0);
@@ -1047,6 +1048,7 @@ mod test_extract_if {
     }
 
     #[test]
+    #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
     fn pred_panic_leak() {
         static PREDS: AtomicUsize = AtomicUsize::new(0);
         static DROPS: AtomicUsize = AtomicUsize::new(0);
@@ -1076,6 +1078,7 @@ mod test_extract_if {
 
     // Same as above, but attempt to use the iterator again after the panic in the predicate
     #[test]
+    #[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
     fn pred_panic_reuse() {
         static PREDS: AtomicUsize = AtomicUsize::new(0);
         static DROPS: AtomicUsize = AtomicUsize::new(0);
diff --git a/library/std/src/collections/hash/set/tests.rs b/library/std/src/collections/hash/set/tests.rs
index 7aa2167e213..8ee8a3e8bf6 100644
--- a/library/std/src/collections/hash/set/tests.rs
+++ b/library/std/src/collections/hash/set/tests.rs
@@ -429,6 +429,7 @@ fn test_extract_if() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn test_extract_if_drop_panic_leak() {
     static PREDS: AtomicU32 = AtomicU32::new(0);
     static DROPS: AtomicU32 = AtomicU32::new(0);
@@ -459,6 +460,7 @@ fn test_extract_if_drop_panic_leak() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn test_extract_if_pred_panic_leak() {
     static PREDS: AtomicU32 = AtomicU32::new(0);
     static DROPS: AtomicU32 = AtomicU32::new(0);
diff --git a/library/std/src/env/tests.rs b/library/std/src/env/tests.rs
index fc7aee29733..d0217261068 100644
--- a/library/std/src/env/tests.rs
+++ b/library/std/src/env/tests.rs
@@ -1,7 +1,7 @@
 use super::*;
 
 #[test]
-#[cfg_attr(any(target_os = "emscripten", target_env = "sgx"), ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi", target_env = "sgx"), ignore)]
 fn test_self_exe_path() {
     let path = current_exe();
     assert!(path.is_ok());
diff --git a/library/std/src/fs.rs b/library/std/src/fs.rs
index db7867337dd..124ef121b18 100644
--- a/library/std/src/fs.rs
+++ b/library/std/src/fs.rs
@@ -8,7 +8,15 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
+#[cfg(all(
+    test,
+    not(any(
+        target_os = "emscripten",
+        target_os = "wasi",
+        target_env = "sgx",
+        target_os = "xous"
+    ))
+))]
 mod tests;
 
 use crate::ffi::OsString;
diff --git a/library/std/src/io/buffered/tests.rs b/library/std/src/io/buffered/tests.rs
index d89ecd317d6..bff0f823c4b 100644
--- a/library/std/src/io/buffered/tests.rs
+++ b/library/std/src/io/buffered/tests.rs
@@ -164,6 +164,7 @@ fn test_buffered_reader_stream_position() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn test_buffered_reader_stream_position_panic() {
     let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4];
     let mut reader = BufReader::with_capacity(4, io::Cursor::new(inner));
@@ -487,7 +488,7 @@ fn dont_panic_in_drop_on_panicked_flush() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn panic_in_write_doesnt_flush_in_drop() {
     static WRITES: AtomicUsize = AtomicUsize::new(0);
 
diff --git a/library/std/src/io/stdio/tests.rs b/library/std/src/io/stdio/tests.rs
index ea76a271d12..bf8f3a5adfb 100644
--- a/library/std/src/io/stdio/tests.rs
+++ b/library/std/src/io/stdio/tests.rs
@@ -25,7 +25,7 @@ fn stderrlock_unwind_safe() {
 fn assert_unwind_safe<T: UnwindSafe + RefUnwindSafe>() {}
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn panic_doesnt_poison() {
     thread::spawn(|| {
         let _a = stdin();
@@ -48,17 +48,17 @@ fn panic_doesnt_poison() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn test_lock_stderr() {
     test_lock(stderr, || stderr().lock());
 }
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn test_lock_stdin() {
     test_lock(stdin, || stdin().lock());
 }
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn test_lock_stdout() {
     test_lock(stdout, || stdout().lock());
 }
diff --git a/library/std/src/net/ip_addr.rs b/library/std/src/net/ip_addr.rs
index 8a9426b61f9..4d673a1d66d 100644
--- a/library/std/src/net/ip_addr.rs
+++ b/library/std/src/net/ip_addr.rs
@@ -1,5 +1,5 @@
 // Tests for this module
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", all(target_os = "wasi", target_env = "p1")))))]
 mod tests;
 
 #[stable(feature = "ip_addr", since = "1.7.0")]
diff --git a/library/std/src/net/socket_addr.rs b/library/std/src/net/socket_addr.rs
index 84922aabdb5..ba9c948a2e9 100644
--- a/library/std/src/net/socket_addr.rs
+++ b/library/std/src/net/socket_addr.rs
@@ -1,5 +1,5 @@
 // Tests for this module
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", all(target_os = "wasi", target_env = "p1")))))]
 mod tests;
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/std/src/net/tcp.rs b/library/std/src/net/tcp.rs
index 06ed4f6a03d..f31907b208d 100644
--- a/library/std/src/net/tcp.rs
+++ b/library/std/src/net/tcp.rs
@@ -1,6 +1,13 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "emscripten", target_os = "xous"))))]
+#[cfg(all(
+    test,
+    not(any(
+        target_os = "emscripten",
+        all(target_os = "wasi", target_env = "p1"),
+        target_os = "xous"
+    ))
+))]
 mod tests;
 
 use crate::fmt;
diff --git a/library/std/src/net/tcp/tests.rs b/library/std/src/net/tcp/tests.rs
index d26517d74e4..a7b5cdf4ec0 100644
--- a/library/std/src/net/tcp/tests.rs
+++ b/library/std/src/net/tcp/tests.rs
@@ -57,6 +57,7 @@ fn connect_timeout_error() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn listen_localhost() {
     let socket_addr = next_test_ip4();
     let listener = t!(TcpListener::bind(&socket_addr));
@@ -73,6 +74,7 @@ fn listen_localhost() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn connect_loopback() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -94,6 +96,7 @@ fn connect_loopback() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn smoke_test() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -114,6 +117,7 @@ fn smoke_test() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn read_eof() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -133,6 +137,7 @@ fn read_eof() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn write_close() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -161,6 +166,7 @@ fn write_close() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn multiple_connect_serial() {
     each_ip(&mut |addr| {
         let max = 10;
@@ -183,6 +189,7 @@ fn multiple_connect_serial() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn multiple_connect_interleaved_greedy_schedule() {
     const MAX: usize = 10;
     each_ip(&mut |addr| {
@@ -220,6 +227,7 @@ fn multiple_connect_interleaved_greedy_schedule() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn multiple_connect_interleaved_lazy_schedule() {
     const MAX: usize = 10;
     each_ip(&mut |addr| {
@@ -255,6 +263,7 @@ fn multiple_connect_interleaved_lazy_schedule() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn socket_and_peer_name() {
     each_ip(&mut |addr| {
         let listener = t!(TcpListener::bind(&addr));
@@ -270,6 +279,7 @@ fn socket_and_peer_name() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn partial_read() {
     each_ip(&mut |addr| {
         let (tx, rx) = channel();
@@ -291,6 +301,7 @@ fn partial_read() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn read_buf() {
     each_ip(&mut |addr| {
         let srv = t!(TcpListener::bind(&addr));
@@ -389,6 +400,7 @@ fn double_bind() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn tcp_clone_smoke() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -420,6 +432,7 @@ fn tcp_clone_smoke() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn tcp_clone_two_read() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -454,6 +467,7 @@ fn tcp_clone_two_read() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn tcp_clone_two_write() {
     each_ip(&mut |addr| {
         let acceptor = t!(TcpListener::bind(&addr));
@@ -483,6 +497,7 @@ fn tcp_clone_two_write() {
 #[test]
 // FIXME: https://github.com/fortanix/rust-sgx/issues/110
 #[cfg_attr(target_env = "sgx", ignore)]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn shutdown_smoke() {
     each_ip(&mut |addr| {
         let a = t!(TcpListener::bind(&addr));
@@ -505,6 +520,7 @@ fn shutdown_smoke() {
 #[test]
 // FIXME: https://github.com/fortanix/rust-sgx/issues/110
 #[cfg_attr(target_env = "sgx", ignore)]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn close_readwrite_smoke() {
     each_ip(&mut |addr| {
         let a = t!(TcpListener::bind(&addr));
@@ -547,6 +563,7 @@ fn close_readwrite_smoke() {
 #[cfg_attr(target_env = "sgx", ignore)]
 // On windows, shutdown will not wake up blocking I/O operations.
 #[cfg_attr(windows, ignore)]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn close_read_wakes_up() {
     each_ip(&mut |addr| {
         let listener = t!(TcpListener::bind(&addr));
@@ -574,6 +591,7 @@ fn close_read_wakes_up() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn clone_while_reading() {
     each_ip(&mut |addr| {
         let accept = t!(TcpListener::bind(&addr));
@@ -614,6 +632,7 @@ fn clone_while_reading() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn clone_accept_smoke() {
     each_ip(&mut |addr| {
         let a = t!(TcpListener::bind(&addr));
@@ -632,6 +651,7 @@ fn clone_accept_smoke() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn clone_accept_concurrent() {
     each_ip(&mut |addr| {
         let a = t!(TcpListener::bind(&addr));
@@ -670,10 +690,10 @@ fn debug() {
         addr.to_string()
     }
 
+    #[cfg(any(unix, target_os = "wasi"))]
+    use crate::os::fd::AsRawFd;
     #[cfg(target_env = "sgx")]
     use crate::os::fortanix_sgx::io::AsRawFd;
-    #[cfg(unix)]
-    use crate::os::unix::io::AsRawFd;
     #[cfg(not(windows))]
     fn render_inner(addr: &dyn AsRawFd) -> impl fmt::Debug {
         addr.as_raw_fd()
@@ -714,6 +734,7 @@ fn debug() {
     ignore
 )]
 #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 #[test]
 fn timeouts() {
     let addr = next_test_ip4();
@@ -742,6 +763,7 @@ fn timeouts() {
 
 #[test]
 #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 fn test_read_timeout() {
     let addr = next_test_ip4();
     let listener = t!(TcpListener::bind(&addr));
@@ -763,6 +785,7 @@ fn test_read_timeout() {
 
 #[test]
 #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 fn test_read_with_timeout() {
     let addr = next_test_ip4();
     let listener = t!(TcpListener::bind(&addr));
@@ -810,6 +833,7 @@ fn test_timeout_zero_duration() {
 
 #[test]
 #[cfg_attr(target_env = "sgx", ignore)]
+#[cfg_attr(target_os = "wasi", ignore)] // linger not supported
 fn linger() {
     let addr = next_test_ip4();
     let _listener = t!(TcpListener::bind(&addr));
@@ -879,6 +903,7 @@ fn set_nonblocking() {
 
 #[test]
 #[cfg_attr(target_env = "sgx", ignore)] // FIXME: https://github.com/fortanix/rust-sgx/issues/31
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn peek() {
     each_ip(&mut |addr| {
         let (txdone, rxdone) = channel();
diff --git a/library/std/src/net/udp.rs b/library/std/src/net/udp.rs
index 8c9e31f9c15..8954d9601b7 100644
--- a/library/std/src/net/udp.rs
+++ b/library/std/src/net/udp.rs
@@ -1,4 +1,12 @@
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
+#[cfg(all(
+    test,
+    not(any(
+        target_os = "emscripten",
+        all(target_os = "wasi", target_env = "p1"),
+        target_env = "sgx",
+        target_os = "xous"
+    ))
+))]
 mod tests;
 
 use crate::fmt;
diff --git a/library/std/src/net/udp/tests.rs b/library/std/src/net/udp/tests.rs
index 0cf99366452..1c8c58d1879 100644
--- a/library/std/src/net/udp/tests.rs
+++ b/library/std/src/net/udp/tests.rs
@@ -27,6 +27,7 @@ fn bind_error() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn socket_smoke_test_ip4() {
     each_ip(&mut |server_ip, client_ip| {
         let (tx1, rx1) = channel();
@@ -69,6 +70,7 @@ fn socket_peer() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn udp_clone_smoke() {
     each_ip(&mut |addr1, addr2| {
         let sock1 = t!(UdpSocket::bind(&addr1));
@@ -98,6 +100,7 @@ fn udp_clone_smoke() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn udp_clone_two_read() {
     each_ip(&mut |addr1, addr2| {
         let sock1 = t!(UdpSocket::bind(&addr1));
@@ -130,6 +133,7 @@ fn udp_clone_two_read() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // no threads
 fn udp_clone_two_write() {
     each_ip(&mut |addr1, addr2| {
         let sock1 = t!(UdpSocket::bind(&addr1));
@@ -183,6 +187,7 @@ fn debug() {
     any(target_os = "netbsd", target_os = "openbsd", target_os = "vxworks", target_os = "nto"),
     ignore
 )]
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 #[test]
 fn timeouts() {
     let addr = next_test_ip4();
@@ -208,6 +213,7 @@ fn timeouts() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 fn test_read_timeout() {
     let addr = next_test_ip4();
 
@@ -232,6 +238,7 @@ fn test_read_timeout() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // timeout not supported
 fn test_read_with_timeout() {
     let addr = next_test_ip4();
 
@@ -291,6 +298,7 @@ fn connect_send_recv() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // peek not supported
 fn connect_send_peek_recv() {
     each_ip(&mut |addr, _| {
         let socket = t!(UdpSocket::bind(&addr));
@@ -313,6 +321,7 @@ fn connect_send_peek_recv() {
 }
 
 #[test]
+#[cfg_attr(target_os = "wasi", ignore)] // peek_from not supported
 fn peek_from() {
     each_ip(&mut |addr, _| {
         let socket = t!(UdpSocket::bind(&addr));
diff --git a/library/std/src/path/tests.rs b/library/std/src/path/tests.rs
index 6436872087d..b75793d2bc9 100644
--- a/library/std/src/path/tests.rs
+++ b/library/std/src/path/tests.rs
@@ -139,7 +139,7 @@ fn test_pathbuf_leak() {
 }
 
 #[test]
-#[cfg(unix)]
+#[cfg(any(unix, target_os = "wasi"))]
 pub fn test_decompositions_unix() {
     t!("",
     iter: [],
@@ -1201,7 +1201,10 @@ pub fn test_push() {
         });
     );
 
-    if cfg!(unix) || cfg!(all(target_env = "sgx", target_vendor = "fortanix")) {
+    if cfg!(unix)
+        || cfg!(target_os = "wasi")
+        || cfg!(all(target_env = "sgx", target_vendor = "fortanix"))
+    {
         tp!("", "foo", "foo");
         tp!("foo", "bar", "foo/bar");
         tp!("foo/", "bar", "foo/bar");
@@ -1358,7 +1361,10 @@ pub fn test_set_file_name() {
     tfn!("foo", "bar", "bar");
     tfn!("foo", "", "");
     tfn!("", "foo", "foo");
-    if cfg!(unix) || cfg!(all(target_env = "sgx", target_vendor = "fortanix")) {
+    if cfg!(unix)
+        || cfg!(target_os = "wasi")
+        || cfg!(all(target_env = "sgx", target_vendor = "fortanix"))
+    {
         tfn!(".", "foo", "./foo");
         tfn!("foo/", "bar", "bar");
         tfn!("foo/.", "bar", "bar");
@@ -1758,7 +1764,7 @@ fn test_components_debug() {
     assert_eq!(expected, actual);
 }
 
-#[cfg(unix)]
+#[cfg(any(unix, target_os = "wasi"))]
 #[test]
 fn test_iter_debug() {
     let path = Path::new("/tmp");
@@ -1859,7 +1865,7 @@ fn test_ord() {
 }
 
 #[test]
-#[cfg(unix)]
+#[cfg(any(unix, target_os = "wasi"))]
 fn test_unix_absolute() {
     use crate::path::absolute;
 
diff --git a/library/std/src/process.rs b/library/std/src/process.rs
index c84a5c65263..f24fe353e55 100644
--- a/library/std/src/process.rs
+++ b/library/std/src/process.rs
@@ -148,7 +148,15 @@
 #![stable(feature = "process", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
+#[cfg(all(
+    test,
+    not(any(
+        target_os = "emscripten",
+        target_os = "wasi",
+        target_env = "sgx",
+        target_os = "xous"
+    ))
+))]
 mod tests;
 
 use crate::convert::Infallible;
diff --git a/library/std/src/sync/barrier/tests.rs b/library/std/src/sync/barrier/tests.rs
index c5620cd91d8..0fbcd998812 100644
--- a/library/std/src/sync/barrier/tests.rs
+++ b/library/std/src/sync/barrier/tests.rs
@@ -3,7 +3,7 @@ use crate::sync::{Arc, Barrier};
 use crate::thread;
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn test_barrier() {
     const N: usize = 10;
 
diff --git a/library/std/src/sync/condvar/tests.rs b/library/std/src/sync/condvar/tests.rs
index 12d13a6b20b..f9e9066bc92 100644
--- a/library/std/src/sync/condvar/tests.rs
+++ b/library/std/src/sync/condvar/tests.rs
@@ -12,7 +12,7 @@ fn smoke() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn notify_one() {
     let m = Arc::new(Mutex::new(()));
     let m2 = m.clone();
@@ -29,7 +29,7 @@ fn notify_one() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn notify_all() {
     const N: usize = 10;
 
@@ -66,7 +66,7 @@ fn notify_all() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn wait_while() {
     let pair = Arc::new((Mutex::new(false), Condvar::new()));
     let pair2 = pair.clone();
@@ -87,7 +87,7 @@ fn wait_while() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
 fn wait_timeout_wait() {
     let m = Arc::new(Mutex::new(()));
     let c = Arc::new(Condvar::new());
@@ -106,7 +106,7 @@ fn wait_timeout_wait() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
 fn wait_timeout_while_wait() {
     let m = Arc::new(Mutex::new(()));
     let c = Arc::new(Condvar::new());
@@ -118,7 +118,7 @@ fn wait_timeout_while_wait() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // condvar wait not supported
 fn wait_timeout_while_instant_satisfy() {
     let m = Arc::new(Mutex::new(()));
     let c = Arc::new(Condvar::new());
@@ -130,7 +130,7 @@ fn wait_timeout_while_instant_satisfy() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn wait_timeout_while_wake() {
     let pair = Arc::new((Mutex::new(false), Condvar::new()));
     let pair_copy = pair.clone();
@@ -153,7 +153,7 @@ fn wait_timeout_while_wake() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn wait_timeout_wake() {
     let m = Arc::new(Mutex::new(()));
     let c = Arc::new(Condvar::new());
diff --git a/library/std/src/sync/lazy_lock/tests.rs b/library/std/src/sync/lazy_lock/tests.rs
index 94044368305..7d7dde54349 100644
--- a/library/std/src/sync/lazy_lock/tests.rs
+++ b/library/std/src/sync/lazy_lock/tests.rs
@@ -34,6 +34,7 @@ fn lazy_default() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn lazy_poisoning() {
     let x: LazyCell<String> = LazyCell::new(|| panic!("kaboom"));
     for _ in 0..2 {
@@ -43,7 +44,7 @@ fn lazy_poisoning() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn sync_lazy_new() {
     static CALLED: AtomicUsize = AtomicUsize::new(0);
     static SYNC_LAZY: LazyLock<i32> = LazyLock::new(|| {
@@ -90,7 +91,7 @@ fn sync_lazy_default() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn static_sync_lazy() {
     static XS: LazyLock<Vec<i32>> = LazyLock::new(|| {
         let mut xs = Vec::new();
@@ -123,6 +124,7 @@ fn static_sync_lazy_via_fn() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn sync_lazy_poisoning() {
     let x: LazyLock<String> = LazyLock::new(|| panic!("kaboom"));
     for _ in 0..2 {
diff --git a/library/std/src/sync/mpsc/mod.rs b/library/std/src/sync/mpsc/mod.rs
index 26d5b9515a2..83a93a06369 100644
--- a/library/std/src/sync/mpsc/mod.rs
+++ b/library/std/src/sync/mpsc/mod.rs
@@ -137,10 +137,10 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod sync_tests;
 
 // MPSC channels are built as a wrapper around MPMC channels, which
diff --git a/library/std/src/sync/mutex.rs b/library/std/src/sync/mutex.rs
index f3de1f7bf49..fe2aca031a2 100644
--- a/library/std/src/sync/mutex.rs
+++ b/library/std/src/sync/mutex.rs
@@ -1,4 +1,4 @@
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 use crate::cell::UnsafeCell;
diff --git a/library/std/src/sync/once.rs b/library/std/src/sync/once.rs
index 5a1cd7d0b8b..993df9314fc 100644
--- a/library/std/src/sync/once.rs
+++ b/library/std/src/sync/once.rs
@@ -3,7 +3,7 @@
 //! This primitive is meant to be used to run one-time initialization. An
 //! example use case would be for initializing an FFI library.
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 use crate::fmt;
diff --git a/library/std/src/sync/once_lock/tests.rs b/library/std/src/sync/once_lock/tests.rs
index 1fff3273d20..5113d436c3c 100644
--- a/library/std/src/sync/once_lock/tests.rs
+++ b/library/std/src/sync/once_lock/tests.rs
@@ -9,7 +9,7 @@ fn spawn_and_wait<R: Send + 'static>(f: impl FnOnce() -> R + Send + 'static) ->
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn sync_once_cell() {
     static ONCE_CELL: OnceLock<i32> = OnceLock::new();
 
@@ -43,7 +43,7 @@ fn sync_once_cell_get_unchecked() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn sync_once_cell_drop() {
     static DROP_CNT: AtomicUsize = AtomicUsize::new(0);
     struct Dropper;
@@ -81,6 +81,7 @@ fn clone() {
 }
 
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
 fn get_or_try_init() {
     let cell: OnceLock<String> = OnceLock::new();
     assert!(cell.get().is_none());
@@ -154,7 +155,7 @@ fn eval_once_macro() {
 }
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 fn sync_once_cell_does_not_leak_partially_constructed_boxes() {
     static ONCE_CELL: OnceLock<String> = OnceLock::new();
 
diff --git a/library/std/src/sync/reentrant_lock.rs b/library/std/src/sync/reentrant_lock.rs
index 39f23a14441..0140e0d2129 100644
--- a/library/std/src/sync/reentrant_lock.rs
+++ b/library/std/src/sync/reentrant_lock.rs
@@ -1,4 +1,4 @@
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 use cfg_if::cfg_if;
diff --git a/library/std/src/sync/rwlock.rs b/library/std/src/sync/rwlock.rs
index 143bdef736d..da2da6f9dfc 100644
--- a/library/std/src/sync/rwlock.rs
+++ b/library/std/src/sync/rwlock.rs
@@ -1,4 +1,4 @@
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 use crate::cell::UnsafeCell;
diff --git a/library/std/src/sys_common/io.rs b/library/std/src/sys_common/io.rs
index e386c955f37..6f6f282d432 100644
--- a/library/std/src/sys_common/io.rs
+++ b/library/std/src/sys_common/io.rs
@@ -3,7 +3,7 @@
 pub const DEFAULT_BUF_SIZE: usize = if cfg!(target_os = "espidf") { 512 } else { 8 * 1024 };
 
 #[cfg(test)]
-#[allow(dead_code)] // not used on emscripten
+#[allow(dead_code)] // not used on emscripten and wasi
 pub mod test {
     use rand::RngCore;
 
diff --git a/library/std/src/thread/local.rs b/library/std/src/thread/local.rs
index f147c5fdcd1..88bf186700f 100644
--- a/library/std/src/thread/local.rs
+++ b/library/std/src/thread/local.rs
@@ -2,7 +2,7 @@
 
 #![unstable(feature = "thread_local_internals", issue = "none")]
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 #[cfg(test)]
diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs
index 41f02af9366..00e596d4d50 100644
--- a/library/std/src/thread/mod.rs
+++ b/library/std/src/thread/mod.rs
@@ -155,7 +155,7 @@
 // Under `test`, `__FastLocalKeyInner` seems unused.
 #![cfg_attr(test, allow(dead_code))]
 
-#[cfg(all(test, not(target_os = "emscripten")))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi"))))]
 mod tests;
 
 use crate::any::Any;
diff --git a/library/std/tests/create_dir_all_bare.rs b/library/std/tests/create_dir_all_bare.rs
index 8becf713205..30f800c5aa2 100644
--- a/library/std/tests/create_dir_all_bare.rs
+++ b/library/std/tests/create_dir_all_bare.rs
@@ -1,4 +1,4 @@
-#![cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
+#![cfg(all(test, not(any(target_os = "emscripten", target_os = "wasi", target_env = "sgx"))))]
 
 //! Note that this test changes the current directory so
 //! should not be in the same process as other tests.
diff --git a/library/std/tests/process_spawning.rs b/library/std/tests/process_spawning.rs
index d249eb7d50a..3e72e371ade 100644
--- a/library/std/tests/process_spawning.rs
+++ b/library/std/tests/process_spawning.rs
@@ -5,7 +5,7 @@ use std::{env, fs, process, str};
 mod common;
 
 #[test]
-#[cfg_attr(miri, ignore)] // Process spawning not supported by Miri
+#[cfg_attr(any(miri, target_os = "wasi"), ignore)] // Process spawning not supported by Miri and wasi
 fn issue_15149() {
     // If we're the parent, copy our own binary to a new directory.
     let my_path = env::current_exe().unwrap();
diff --git a/library/std/tests/thread.rs b/library/std/tests/thread.rs
index fc9917178b2..83574176186 100644
--- a/library/std/tests/thread.rs
+++ b/library/std/tests/thread.rs
@@ -4,7 +4,7 @@ use std::thread;
 use std::time::Duration;
 
 #[test]
-#[cfg_attr(target_os = "emscripten", ignore)]
+#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
 #[cfg_attr(miri, ignore)] // Miri does not like the thread leak
 fn sleep_very_long() {
     let finished = Arc::new(Mutex::new(false));