1 files changed, 89 insertions, 0 deletions
diff --git a/library/std/src/sys/vxworks/condvar.rs b/library/std/src/sys/vxworks/condvar.rs
new file mode 100644
index 00000000000..5a77966d974
--- /dev/null
+++ b/library/std/src/sys/vxworks/condvar.rs
@@ -0,0 +1,89 @@
+use crate::cell::UnsafeCell;
+use crate::sys::mutex::{self, Mutex};
+use crate::time::Duration;
+
+pub struct Condvar {
+    inner: UnsafeCell<libc::pthread_cond_t>,
+}
+
+unsafe impl Send for Condvar {}
+unsafe impl Sync for Condvar {}
+
+const TIMESPEC_MAX: libc::timespec =
+    libc::timespec { tv_sec: <libc::time_t>::MAX, tv_nsec: 1_000_000_000 - 1 };
+
+fn saturating_cast_to_time_t(value: u64) -> libc::time_t {
+    if value > <libc::time_t>::MAX as u64 { <libc::time_t>::MAX } else { value as libc::time_t }
+}
+
+impl Condvar {
+    pub const fn new() -> Condvar {
+        // Might be moved and address is changing it is better to avoid
+        // initialization of potentially opaque OS data before it landed
+        Condvar { inner: UnsafeCell::new(libc::PTHREAD_COND_INITIALIZER) }
+    }
+
+    pub unsafe fn init(&mut self) {
+        use crate::mem::MaybeUninit;
+        let mut attr = MaybeUninit::<libc::pthread_condattr_t>::uninit();
+        let r = libc::pthread_condattr_init(attr.as_mut_ptr());
+        assert_eq!(r, 0);
+        let r = libc::pthread_condattr_setclock(attr.as_mut_ptr(), libc::CLOCK_MONOTONIC);
+        assert_eq!(r, 0);
+        let r = libc::pthread_cond_init(self.inner.get(), attr.as_ptr());
+        assert_eq!(r, 0);
+        let r = libc::pthread_condattr_destroy(attr.as_mut_ptr());
+        assert_eq!(r, 0);
+    }
+
+    #[inline]
+    pub unsafe fn notify_one(&self) {
+        let r = libc::pthread_cond_signal(self.inner.get());
+        debug_assert_eq!(r, 0);
+    }
+
+    #[inline]
+    pub unsafe fn notify_all(&self) {
+        let r = libc::pthread_cond_broadcast(self.inner.get());
+        debug_assert_eq!(r, 0);
+    }
+
+    #[inline]
+    pub unsafe fn wait(&self, mutex: &Mutex) {
+        let r = libc::pthread_cond_wait(self.inner.get(), mutex::raw(mutex));
+        debug_assert_eq!(r, 0);
+    }
+
+    // This implementation is used on systems that support pthread_condattr_setclock
+    // where we configure condition variable to use monotonic clock (instead of
+    // default system clock). This approach avoids all problems that result
+    // from changes made to the system time.
+    pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
+        use crate::mem;
+
+        let mut now: libc::timespec = mem::zeroed();
+        let r = libc::clock_gettime(libc::CLOCK_MONOTONIC, &mut now);
+        assert_eq!(r, 0);
+
+        // Nanosecond calculations can't overflow because both values are below 1e9.
+        let nsec = dur.subsec_nanos() + now.tv_nsec as u32;
+
+        let sec = saturating_cast_to_time_t(dur.as_secs())
+            .checked_add((nsec / 1_000_000_000) as libc::time_t)
+            .and_then(|s| s.checked_add(now.tv_sec));
+        let nsec = nsec % 1_000_000_000;
+
+        let timeout =
+            sec.map(|s| libc::timespec { tv_sec: s, tv_nsec: nsec as _ }).unwrap_or(TIMESPEC_MAX);
+
+        let r = libc::pthread_cond_timedwait(self.inner.get(), mutex::raw(mutex), &timeout);
+        assert!(r == libc::ETIMEDOUT || r == 0);
+        r == 0
+    }
+
+    #[inline]
+    pub unsafe fn destroy(&self) {
+        let r = libc::pthread_cond_destroy(self.inner.get());
+        debug_assert_eq!(r, 0);
+    }
+}