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//===--- MutexPThread.cpp - Supports Mutex.h using PThreads ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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
//
//===----------------------------------------------------------------------===//
//
// Mutex, ConditionVariable, Read/Write lock, and Scoped lock implementations
// using PThreads.
//
//===----------------------------------------------------------------------===//
#if __has_include(<unistd.h>)
#include <unistd.h>
#endif
#if defined(_POSIX_THREADS) && !defined(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME)
// Notes: swift::fatalError is not shared between libswiftCore and libswift_Concurrency
// and libswift_Concurrency uses swift_Concurrency_fatalError instead.
/* #ifndef SWIFT_FATAL_ERROR */
/* #define SWIFT_FATAL_ERROR swift::fatalError */
/* #endif */
// This is the concurrency Mutex implementation. We're forcing the concurrency
// fatalError here.
#include "Concurrency/Error.h"
#define SWIFT_FATAL_ERROR swift_Concurrency_fatalError
#include "Concurrency/Threading/Mutex.h"
#include "swift/Runtime/Debug.h"
#include <errno.h>
#include <stdlib.h>
using namespace swift;
#define reportError(PThreadFunction) \
do { \
int errorcode = PThreadFunction; \
if (errorcode != 0) { \
SWIFT_FATAL_ERROR(/* flags = */ 0, "'%s' failed with error '%s'(%d)\n", \
#PThreadFunction, errorName(errorcode), errorcode); \
} \
} while (false)
#define returnTrueOrReportError(PThreadFunction, returnFalseOnEBUSY) \
do { \
int errorcode = PThreadFunction; \
if (errorcode == 0) \
return true; \
if (returnFalseOnEBUSY && errorcode == EBUSY) \
return false; \
SWIFT_FATAL_ERROR(/* flags = */ 0, "'%s' failed with error '%s'(%d)\n", \
#PThreadFunction, errorName(errorcode), errorcode); \
} while (false)
static const char *errorName(int errorcode) {
switch (errorcode) {
case EINVAL:
return "EINVAL";
case EPERM:
return "EPERM";
case EDEADLK:
return "EDEADLK";
case ENOMEM:
return "ENOMEM";
case EAGAIN:
return "EAGAIN";
case EBUSY:
return "EBUSY";
default:
return "<unknown>";
}
}
void ConditionPlatformHelper::init(pthread_cond_t &condition) {
reportError(pthread_cond_init(&condition, nullptr));
}
void ConditionPlatformHelper::destroy(pthread_cond_t &condition) {
reportError(pthread_cond_destroy(&condition));
}
void ConditionPlatformHelper::notifyOne(pthread_cond_t &condition) {
reportError(pthread_cond_signal(&condition));
}
void ConditionPlatformHelper::notifyAll(pthread_cond_t &condition) {
reportError(pthread_cond_broadcast(&condition));
}
void ConditionPlatformHelper::wait(pthread_cond_t &condition,
pthread_mutex_t &mutex) {
reportError(pthread_cond_wait(&condition, &mutex));
}
void MutexPlatformHelper::init(pthread_mutex_t &mutex, bool checked) {
pthread_mutexattr_t attr;
int kind = (checked ? PTHREAD_MUTEX_ERRORCHECK : PTHREAD_MUTEX_NORMAL);
reportError(pthread_mutexattr_init(&attr));
reportError(pthread_mutexattr_settype(&attr, kind));
reportError(pthread_mutex_init(&mutex, &attr));
reportError(pthread_mutexattr_destroy(&attr));
}
void MutexPlatformHelper::destroy(pthread_mutex_t &mutex) {
reportError(pthread_mutex_destroy(&mutex));
}
void MutexPlatformHelper::lock(pthread_mutex_t &mutex) {
reportError(pthread_mutex_lock(&mutex));
}
void MutexPlatformHelper::unlock(pthread_mutex_t &mutex) {
reportError(pthread_mutex_unlock(&mutex));
}
bool MutexPlatformHelper::try_lock(pthread_mutex_t &mutex) {
returnTrueOrReportError(pthread_mutex_trylock(&mutex),
/* returnFalseOnEBUSY = */ true);
}
#if HAS_OS_UNFAIR_LOCK
void MutexPlatformHelper::init(os_unfair_lock &lock, bool checked) {
(void)checked; // Unfair locks are always checked.
lock = OS_UNFAIR_LOCK_INIT;
}
void MutexPlatformHelper::destroy(os_unfair_lock &lock) {}
void MutexPlatformHelper::lock(os_unfair_lock &lock) {
os_unfair_lock_lock(&lock);
}
void MutexPlatformHelper::unlock(os_unfair_lock &lock) {
os_unfair_lock_unlock(&lock);
}
bool MutexPlatformHelper::try_lock(os_unfair_lock &lock) {
return os_unfair_lock_trylock(&lock);
}
#endif
void ReadWriteLockPlatformHelper::init(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_init(&rwlock, nullptr));
}
void ReadWriteLockPlatformHelper::destroy(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_destroy(&rwlock));
}
void ReadWriteLockPlatformHelper::readLock(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_rdlock(&rwlock));
}
bool ReadWriteLockPlatformHelper::try_readLock(pthread_rwlock_t &rwlock) {
returnTrueOrReportError(pthread_rwlock_tryrdlock(&rwlock),
/* returnFalseOnEBUSY = */ true);
}
void ReadWriteLockPlatformHelper::writeLock(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_wrlock(&rwlock));
}
bool ReadWriteLockPlatformHelper::try_writeLock(pthread_rwlock_t &rwlock) {
returnTrueOrReportError(pthread_rwlock_trywrlock(&rwlock),
/* returnFalseOnEBUSY = */ true);
}
void ReadWriteLockPlatformHelper::readUnlock(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_unlock(&rwlock));
}
void ReadWriteLockPlatformHelper::writeUnlock(pthread_rwlock_t &rwlock) {
reportError(pthread_rwlock_unlock(&rwlock));
}
#endif
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