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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /library/std/src/sys/unsupported/locks/mutex.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'library/std/src/sys/unsupported/locks/mutex.rs')
-rw-r--r-- | library/std/src/sys/unsupported/locks/mutex.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/library/std/src/sys/unsupported/locks/mutex.rs b/library/std/src/sys/unsupported/locks/mutex.rs new file mode 100644 index 000000000..d7cb12e0c --- /dev/null +++ b/library/std/src/sys/unsupported/locks/mutex.rs @@ -0,0 +1,36 @@ +use crate::cell::Cell; + +pub struct Mutex { + // This platform has no threads, so we can use a Cell here. + locked: Cell<bool>, +} + +pub type MovableMutex = Mutex; + +unsafe impl Send for Mutex {} +unsafe impl Sync for Mutex {} // no threads on this platform + +impl Mutex { + #[inline] + pub const fn new() -> Mutex { + Mutex { locked: Cell::new(false) } + } + + #[inline] + pub unsafe fn init(&mut self) {} + + #[inline] + pub unsafe fn lock(&self) { + assert_eq!(self.locked.replace(true), false, "cannot recursively acquire mutex"); + } + + #[inline] + pub unsafe fn unlock(&self) { + self.locked.set(false); + } + + #[inline] + pub unsafe fn try_lock(&self) -> bool { + self.locked.replace(true) == false + } +} |