Replace Linux Mutex and Condvar with futex based ones.

1 files changed, 24 insertions, 8 deletions

diff --git a/library/std/src/sys/unix/locks/mod.rs b/library/std/src/sys/unix/locks/mod.rs
index f07a9f93b79..30e9f407eec 100644
--- a/library/std/src/sys/unix/locks/mod.rs
+++ b/library/std/src/sys/unix/locks/mod.rs
@@ -1,8 +1,24 @@
-mod pthread_condvar;
-mod pthread_mutex;
-mod pthread_remutex;
-mod pthread_rwlock;
-pub use pthread_condvar::{Condvar, MovableCondvar};
-pub use pthread_mutex::{MovableMutex, Mutex};
-pub use pthread_remutex::ReentrantMutex;
-pub use pthread_rwlock::{MovableRWLock, RWLock};
+cfg_if::cfg_if! {
+    if #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+    ))] {
+        mod futex;
+        #[allow(dead_code)]
+        mod pthread_mutex; // Only used for PthreadMutexAttr, needed by pthread_remutex.
+        mod pthread_remutex; // FIXME: Implement this using a futex
+        mod pthread_rwlock; // FIXME: Implement this using a futex
+        pub use futex::{Mutex, MovableMutex, Condvar, MovableCondvar};
+        pub use pthread_remutex::ReentrantMutex;
+        pub use pthread_rwlock::{RWLock, MovableRWLock};
+    } else {
+        mod pthread_mutex;
+        mod pthread_remutex;
+        mod pthread_rwlock;
+        mod pthread_condvar;
+        pub use pthread_mutex::{Mutex, MovableMutex};
+        pub use pthread_remutex::ReentrantMutex;
+        pub use pthread_rwlock::{RWLock, MovableRWLock};
+        pub use pthread_condvar::{Condvar, MovableCondvar};
+    }
+}