Return status from futex_wake().

Author: m-ou-se

library/std/src/sys/unix/futex.rs

@@ -69,14 +69,14 @@ pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
 }
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
-pub fn futex_wake(futex: &AtomicI32) {
+pub fn futex_wake(futex: &AtomicI32) -> bool {
     unsafe {
         libc::syscall(
             libc::SYS_futex,
             futex as *const AtomicI32,
             libc::FUTEX_WAKE | libc::FUTEX_PRIVATE_FLAG,
             1,
-        );
+        ) > 0
     }
 }
 
@@ -93,12 +93,10 @@ pub fn futex_wake_all(futex: &AtomicI32) {
 }
 
 #[cfg(target_os = "emscripten")]
-pub fn futex_wake(futex: &AtomicI32) {
+pub fn futex_wake(futex: &AtomicI32) -> bool {
     extern "C" {
         fn emscripten_futex_wake(addr: *const AtomicI32, count: libc::c_int) -> libc::c_int;
     }
 
-    unsafe {
-        emscripten_futex_wake(futex as *const AtomicI32, 1);
-    }
+    unsafe { emscripten_futex_wake(futex as *const AtomicI32, 1) > 0 }
 }