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3405691582
83 lines
2.2 KiB
Swift
83 lines
2.2 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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@usableFromInline
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@_transparent
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func errstr(_ no: Int32) -> String {
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unsafe withUnsafeTemporaryAllocation(of: CChar.self, capacity: Int(NL_TEXTMAX)) { buf in
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unsafe strerror_r(no, buf.baseAddress!, buf.count)
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return unsafe String(validatingCString: buf.baseAddress!)
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?? "An unknown error occurred (\(no))."
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}
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}
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@available(SwiftStdlib 6.0, *)
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@frozen
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@_staticExclusiveOnly
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@safe
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public struct _MutexHandle: ~Copyable {
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@usableFromInline
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@safe
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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 = unsafe pthread_mutex_t(bitPattern: 0)
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let r = unsafe pthread_mutex_init(&mx, nil)
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if r != 0 {
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fatalError("couldn't initialize mutex: \(errstr(errno))")
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}
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value = unsafe _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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let r = unsafe pthread_mutex_lock(value._address)
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if r != 0 {
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fatalError("couldn't lock mutex: \(errstr(errno))")
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}
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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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unsafe 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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let r = unsafe pthread_mutex_unlock(value._address)
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if r != 0 {
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fatalError("couldn't unlock mutex: \(errstr(errno))")
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}
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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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let r = unsafe pthread_mutex_destroy(value._address)
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if r != 0 {
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fatalError("couldn't destroy mutex: \(errstr(errno))")
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}
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}
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}
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