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//===--- ThreadBarriers.swift ---------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if canImport(Darwin)
import Darwin
#elseif canImport(Glibc)
import Glibc
#elseif canImport(Musl)
import Musl
#elseif canImport(Android)
import Android
#elseif os(WASI)
import WASILibc
#elseif os(Windows)
import CRT
import WinSDK
#endif
//
// Implement pthread barriers.
//
// (OS X does not implement them.)
//
public var _stdlib_THREAD_BARRIER_SERIAL_THREAD: CInt {
return 1
}
public struct _stdlib_thread_barrier_t {
#if os(Windows)
var mutex: UnsafeMutablePointer<SRWLOCK>?
var cond: UnsafeMutablePointer<CONDITION_VARIABLE>?
#elseif os(Cygwin) || os(FreeBSD) || os(OpenBSD)
var mutex: UnsafeMutablePointer<pthread_mutex_t?>?
var cond: UnsafeMutablePointer<pthread_cond_t?>?
#elseif os(WASI)
// pthread is currently not available on WASI
#else
var mutex: UnsafeMutablePointer<pthread_mutex_t>?
var cond: UnsafeMutablePointer<pthread_cond_t>?
#endif
/// The number of threads to synchronize.
var count: CUnsignedInt = 0
/// The number of threads already waiting on the barrier.
///
/// This shared variable is protected by `mutex`.
var numThreadsWaiting: CUnsignedInt = 0
public init() {}
}
public func _stdlib_thread_barrier_init(
_ barrier: UnsafeMutablePointer<_stdlib_thread_barrier_t>,
_ count: CUnsignedInt
) -> CInt {
barrier.pointee = _stdlib_thread_barrier_t()
if count == 0 {
errno = EINVAL
return -1
}
#if os(Windows)
barrier.pointee.mutex = UnsafeMutablePointer.allocate(capacity: 1)
InitializeSRWLock(barrier.pointee.mutex!)
barrier.pointee.cond = UnsafeMutablePointer.allocate(capacity: 1)
InitializeConditionVariable(barrier.pointee.cond!)
#elseif os(WASI)
// WASI environment has only a single thread
#else
barrier.pointee.mutex = UnsafeMutablePointer.allocate(capacity: 1)
barrier.pointee.cond = UnsafeMutablePointer.allocate(capacity: 1)
guard _stdlib_thread_barrier_mutex_and_cond_init(barrier) == 0 else {
barrier.pointee.mutex!.deinitialize(count: 1)
barrier.pointee.mutex!.deallocate()
barrier.pointee.cond!.deinitialize(count: 1)
barrier.pointee.cond!.deallocate()
return -1
}
#endif
barrier.pointee.count = count
return 0
}
#if !os(Windows) && !os(WASI)
private func _stdlib_thread_barrier_mutex_and_cond_init(_ barrier: UnsafeMutablePointer<_stdlib_thread_barrier_t>) -> CInt {
guard pthread_mutex_init(barrier.pointee.mutex!, nil) == 0 else {
return -1
}
guard pthread_cond_init(barrier.pointee.cond!, nil) == 0 else {
pthread_mutex_destroy(barrier.pointee.mutex!)
return -1
}
return 0
}
#endif
public func _stdlib_thread_barrier_destroy(
_ barrier: UnsafeMutablePointer<_stdlib_thread_barrier_t>
) {
#if os(Windows)
// Condition Variables do not need to be explicitly destroyed
// Mutexes do not need to be explicitly destroyed
#elseif os(WASI)
// WASI environment has only a single thread
#else
guard pthread_cond_destroy(barrier.pointee.cond!) == 0 &&
pthread_mutex_destroy(barrier.pointee.mutex!) == 0 else {
fatalError("_stdlib_thread_barrier_destroy() failed")
}
#endif
#if !os(WASI)
barrier.pointee.cond!.deinitialize(count: 1)
barrier.pointee.cond!.deallocate()
barrier.pointee.mutex!.deinitialize(count: 1)
barrier.pointee.mutex!.deallocate()
#endif
return
}
public func _stdlib_thread_barrier_wait(
_ barrier: UnsafeMutablePointer<_stdlib_thread_barrier_t>
) -> CInt {
#if os(Windows)
AcquireSRWLockExclusive(barrier.pointee.mutex!)
#elseif os(WASI)
// WASI environment has only a single thread
#else
if pthread_mutex_lock(barrier.pointee.mutex!) != 0 {
return -1
}
#endif
barrier.pointee.numThreadsWaiting += 1
if barrier.pointee.numThreadsWaiting < barrier.pointee.count {
// Put the thread to sleep.
#if os(Windows)
if !SleepConditionVariableSRW(barrier.pointee.cond!, barrier.pointee.mutex!,
INFINITE, 0) {
return -1
}
ReleaseSRWLockExclusive(barrier.pointee.mutex!)
#elseif os(WASI)
// WASI environment has a only single thread
#else
if pthread_cond_wait(barrier.pointee.cond!, barrier.pointee.mutex!) != 0 {
return -1
}
if pthread_mutex_unlock(barrier.pointee.mutex!) != 0 {
return -1
}
#endif
return 0
} else {
// Reset thread count.
barrier.pointee.numThreadsWaiting = 0
// Wake up all threads.
#if os(Windows)
WakeAllConditionVariable(barrier.pointee.cond!)
ReleaseSRWLockExclusive(barrier.pointee.mutex!)
#elseif os(WASI)
// WASI environment has a only single thread
#else
if pthread_cond_broadcast(barrier.pointee.cond!) != 0 {
return -1
}
if pthread_mutex_unlock(barrier.pointee.mutex!) != 0 {
return -1
}
#endif
return _stdlib_THREAD_BARRIER_SERIAL_THREAD
}
}
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