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b527494d2d
On DragonFly pthread_{mutex,rwlock,condvar}_destroy() returns EINVAL
when called on a pthread_{mutex,rwlock,condvar}_t that was just
initialized via PTHREAD_{MUTEX,RWLOCK,CONDVAR}_INITIALIZER and not used
in the meantime or initialized via pthread_{mutex,rwlock,condvar}_init().
Change the code to treat a return value of EINVAL on DragonFly as success.
71 lines
2.3 KiB
Rust
71 lines
2.3 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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pub struct RWLock { inner: UnsafeCell<ffi::pthread_rwlock_t> }
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pub const RWLOCK_INIT: RWLock = RWLock {
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inner: UnsafeCell { value: ffi::PTHREAD_RWLOCK_INITIALIZER },
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};
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impl RWLock {
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#[inline]
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pub unsafe fn new() -> RWLock {
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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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RWLOCK_INIT
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}
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#[inline]
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pub unsafe fn read(&self) {
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let r = ffi::pthread_rwlock_rdlock(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_read(&self) -> bool {
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ffi::pthread_rwlock_tryrdlock(self.inner.get()) == 0
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}
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#[inline]
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pub unsafe fn write(&self) {
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let r = ffi::pthread_rwlock_wrlock(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_write(&self) -> bool {
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ffi::pthread_rwlock_trywrlock(self.inner.get()) == 0
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}
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#[inline]
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pub unsafe fn read_unlock(&self) {
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let r = ffi::pthread_rwlock_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 write_unlock(&self) { self.read_unlock() }
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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_rwlock_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_rwlock_destroy(self.inner.get());
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// On DragonFly pthread_rwlock_destroy() returns EINVAL if called on a
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// rwlock that was just initialized with
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// ffi::PTHREAD_RWLOCK_INITIALIZER. Once it is used (locked/unlocked)
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// or pthread_rwlock_init() is called, 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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