938099a7eb
* Lots of core prelude imports removed * Makefile support for MSVC env vars and Rust crates removed * Makefile support for morestack removed
108 lines
3.6 KiB
Rust
108 lines
3.6 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use cell::UnsafeCell;
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use sys::sync as ffi;
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use mem;
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pub struct Mutex { inner: UnsafeCell<ffi::pthread_mutex_t> }
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#[inline]
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pub unsafe fn raw(m: &Mutex) -> *mut ffi::pthread_mutex_t {
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m.inner.get()
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}
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unsafe impl Send for Mutex {}
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unsafe impl Sync for Mutex {}
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#[allow(dead_code)] // sys isn't exported yet
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impl Mutex {
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pub const fn new() -> Mutex {
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// Might be moved and address is changing it is better to avoid
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// initialization of potentially opaque OS data before it landed
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Mutex { inner: UnsafeCell::new(ffi::PTHREAD_MUTEX_INITIALIZER) }
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}
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#[inline]
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pub unsafe fn lock(&self) {
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let r = ffi::pthread_mutex_lock(self.inner.get());
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debug_assert_eq!(r, 0);
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}
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#[inline]
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pub unsafe fn unlock(&self) {
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let r = ffi::pthread_mutex_unlock(self.inner.get());
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debug_assert_eq!(r, 0);
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}
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#[inline]
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pub unsafe fn try_lock(&self) -> bool {
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ffi::pthread_mutex_trylock(self.inner.get()) == 0
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}
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#[inline]
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#[cfg(not(target_os = "dragonfly"))]
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pub unsafe fn destroy(&self) {
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let r = ffi::pthread_mutex_destroy(self.inner.get());
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debug_assert_eq!(r, 0);
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}
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#[inline]
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#[cfg(target_os = "dragonfly")]
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pub unsafe fn destroy(&self) {
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use libc;
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let r = ffi::pthread_mutex_destroy(self.inner.get());
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// On DragonFly pthread_mutex_destroy() returns EINVAL if called on a
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// mutex that was just initialized with ffi::PTHREAD_MUTEX_INITIALIZER.
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// Once it is used (locked/unlocked) or pthread_mutex_init() is called,
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// this behaviour no longer occurs.
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debug_assert!(r == 0 || r == libc::EINVAL);
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}
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}
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pub struct ReentrantMutex { inner: UnsafeCell<ffi::pthread_mutex_t> }
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unsafe impl Send for ReentrantMutex {}
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unsafe impl Sync for ReentrantMutex {}
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impl ReentrantMutex {
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pub unsafe fn uninitialized() -> ReentrantMutex {
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ReentrantMutex { inner: mem::uninitialized() }
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}
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pub unsafe fn init(&mut self) {
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let mut attr: ffi::pthread_mutexattr_t = mem::uninitialized();
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let result = ffi::pthread_mutexattr_init(&mut attr as *mut _);
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debug_assert_eq!(result, 0);
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let result = ffi::pthread_mutexattr_settype(&mut attr as *mut _,
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ffi::PTHREAD_MUTEX_RECURSIVE);
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debug_assert_eq!(result, 0);
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let result = ffi::pthread_mutex_init(self.inner.get(), &attr as *const _);
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debug_assert_eq!(result, 0);
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let result = ffi::pthread_mutexattr_destroy(&mut attr as *mut _);
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debug_assert_eq!(result, 0);
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}
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pub unsafe fn lock(&self) {
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let result = ffi::pthread_mutex_lock(self.inner.get());
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debug_assert_eq!(result, 0);
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}
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#[inline]
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pub unsafe fn try_lock(&self) -> bool {
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ffi::pthread_mutex_trylock(self.inner.get()) == 0
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}
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pub unsafe fn unlock(&self) {
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let result = ffi::pthread_mutex_unlock(self.inner.get());
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debug_assert_eq!(result, 0);
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}
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pub unsafe fn destroy(&self) {
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let result = ffi::pthread_mutex_destroy(self.inner.get());
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debug_assert_eq!(result, 0);
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}
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}
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