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0826d47a8b
`pthread_mutex_trylock` return `0` on success.
```
NAME
pthread_mutex_trylock – attempt to lock a mutex without blocking
SYNOPSIS
#include <pthread.h>
int
pthread_mutex_trylock(pthread_mutex_t *mutex);
DESCRIPTION
The pthread_mutex_trylock() function locks mutex. If the mutex is already locked,
pthread_mutex_trylock() will not block waiting for the mutex, but will return an error
condition.
RETURN VALUES
If successful, pthread_mutex_trylock() will return zero, otherwise an error number will
be returned to indicate the error.
ERRORS
The pthread_mutex_trylock() function will fail if:
[EINVAL] The value specified by mutex is invalid.
[EBUSY] Mutex is already locked.
```
59 lines
1.5 KiB
Swift
59 lines
1.5 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift Atomics open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import Glibc
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@available(SwiftStdlib 6.0, *)
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@frozen
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@_staticExclusiveOnly
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public struct _MutexHandle: ~Copyable {
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@usableFromInline
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let value: _Cell<pthread_mutex_t?>
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@available(SwiftStdlib 6.0, *)
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@_alwaysEmitIntoClient
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@_transparent
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public init() {
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var mx = pthread_mutex_t(bitPattern: 0)
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pthread_mutex_init(&mx, nil)
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value = _Cell(mx)
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}
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@available(SwiftStdlib 6.0, *)
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@_alwaysEmitIntoClient
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@_transparent
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internal borrowing func _lock() {
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pthread_mutex_lock(value._address)
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}
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@available(SwiftStdlib 6.0, *)
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@_alwaysEmitIntoClient
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@_transparent
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internal borrowing func _tryLock() -> Bool {
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pthread_mutex_trylock(value._address) == 0
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}
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@available(SwiftStdlib 6.0, *)
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@_alwaysEmitIntoClient
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@_transparent
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internal borrowing func _unlock() {
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pthread_mutex_unlock(value._address)
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}
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@available(SwiftStdlib 6.0, *)
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@_alwaysEmitIntoClient
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@_transparent
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deinit {
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pthread_mutex_destroy(value._address)
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}
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}
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