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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/base/platform/mutex.h"
#include <errno.h>
namespace v8 {
namespace base {
#if V8_OS_POSIX
static V8_INLINE void InitializeNativeHandle(pthread_mutex_t* mutex) {
int result;
#if defined(DEBUG)
// Use an error checking mutex in debug mode.
pthread_mutexattr_t attr;
result = pthread_mutexattr_init(&attr);
DCHECK_EQ(0, result);
result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
DCHECK_EQ(0, result);
result = pthread_mutex_init(mutex, &attr);
DCHECK_EQ(0, result);
result = pthread_mutexattr_destroy(&attr);
#else
// Use a fast mutex (default attributes).
result = pthread_mutex_init(mutex, nullptr);
#endif // defined(DEBUG)
DCHECK_EQ(0, result);
USE(result);
}
static V8_INLINE void InitializeRecursiveNativeHandle(pthread_mutex_t* mutex) {
pthread_mutexattr_t attr;
int result = pthread_mutexattr_init(&attr);
DCHECK_EQ(0, result);
result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
DCHECK_EQ(0, result);
result = pthread_mutex_init(mutex, &attr);
DCHECK_EQ(0, result);
result = pthread_mutexattr_destroy(&attr);
DCHECK_EQ(0, result);
USE(result);
}
static V8_INLINE void DestroyNativeHandle(pthread_mutex_t* mutex) {
int result = pthread_mutex_destroy(mutex);
DCHECK_EQ(0, result);
USE(result);
}
static V8_INLINE void LockNativeHandle(pthread_mutex_t* mutex) {
int result = pthread_mutex_lock(mutex);
DCHECK_EQ(0, result);
USE(result);
}
static V8_INLINE void UnlockNativeHandle(pthread_mutex_t* mutex) {
int result = pthread_mutex_unlock(mutex);
DCHECK_EQ(0, result);
USE(result);
}
static V8_INLINE bool TryLockNativeHandle(pthread_mutex_t* mutex) {
int result = pthread_mutex_trylock(mutex);
if (result == EBUSY) {
return false;
}
DCHECK_EQ(0, result);
return true;
}
Mutex::Mutex() {
InitializeNativeHandle(&native_handle_);
#ifdef DEBUG
level_ = 0;
#endif
}
Mutex::~Mutex() {
DestroyNativeHandle(&native_handle_);
DCHECK_EQ(0, level_);
}
void Mutex::Lock() {
LockNativeHandle(&native_handle_);
AssertUnheldAndMark();
}
void Mutex::Unlock() {
AssertHeldAndUnmark();
UnlockNativeHandle(&native_handle_);
}
bool Mutex::TryLock() {
if (!TryLockNativeHandle(&native_handle_)) {
return false;
}
AssertUnheldAndMark();
return true;
}
RecursiveMutex::RecursiveMutex() {
InitializeRecursiveNativeHandle(&native_handle_);
#ifdef DEBUG
level_ = 0;
#endif
}
RecursiveMutex::~RecursiveMutex() {
DestroyNativeHandle(&native_handle_);
DCHECK_EQ(0, level_);
}
void RecursiveMutex::Lock() {
LockNativeHandle(&native_handle_);
#ifdef DEBUG
DCHECK_LE(0, level_);
level_++;
#endif
}
void RecursiveMutex::Unlock() {
#ifdef DEBUG
DCHECK_LT(0, level_);
level_--;
#endif
UnlockNativeHandle(&native_handle_);
}
bool RecursiveMutex::TryLock() {
if (!TryLockNativeHandle(&native_handle_)) {
return false;
}
#ifdef DEBUG
DCHECK_LE(0, level_);
level_++;
#endif
return true;
}
SharedMutex::SharedMutex() { pthread_rwlock_init(&native_handle_, nullptr); }
SharedMutex::~SharedMutex() {
int result = pthread_rwlock_destroy(&native_handle_);
DCHECK_EQ(0, result);
USE(result);
}
void SharedMutex::LockShared() {
int result = pthread_rwlock_rdlock(&native_handle_);
DCHECK_EQ(0, result);
USE(result);
}
void SharedMutex::LockExclusive() {
int result = pthread_rwlock_wrlock(&native_handle_);
DCHECK_EQ(0, result);
USE(result);
}
void SharedMutex::UnlockShared() {
int result = pthread_rwlock_unlock(&native_handle_);
DCHECK_EQ(0, result);
USE(result);
}
void SharedMutex::UnlockExclusive() {
// Same code as {UnlockShared} on POSIX.
UnlockShared();
}
bool SharedMutex::TryLockShared() {
return pthread_rwlock_tryrdlock(&native_handle_) == 0;
}
bool SharedMutex::TryLockExclusive() {
return pthread_rwlock_trywrlock(&native_handle_) == 0;
}
#elif V8_OS_WIN
Mutex::Mutex() : native_handle_(SRWLOCK_INIT) {
#ifdef DEBUG
level_ = 0;
#endif
}
Mutex::~Mutex() {
DCHECK_EQ(0, level_);
}
void Mutex::Lock() {
AcquireSRWLockExclusive(&native_handle_);
AssertUnheldAndMark();
}
void Mutex::Unlock() {
AssertHeldAndUnmark();
ReleaseSRWLockExclusive(&native_handle_);
}
bool Mutex::TryLock() {
if (!TryAcquireSRWLockExclusive(&native_handle_)) {
return false;
}
AssertUnheldAndMark();
return true;
}
RecursiveMutex::RecursiveMutex() {
InitializeCriticalSection(&native_handle_);
#ifdef DEBUG
level_ = 0;
#endif
}
RecursiveMutex::~RecursiveMutex() {
DeleteCriticalSection(&native_handle_);
DCHECK_EQ(0, level_);
}
void RecursiveMutex::Lock() {
EnterCriticalSection(&native_handle_);
#ifdef DEBUG
DCHECK_LE(0, level_);
level_++;
#endif
}
void RecursiveMutex::Unlock() {
#ifdef DEBUG
DCHECK_LT(0, level_);
level_--;
#endif
LeaveCriticalSection(&native_handle_);
}
bool RecursiveMutex::TryLock() {
if (!TryEnterCriticalSection(&native_handle_)) {
return false;
}
#ifdef DEBUG
DCHECK_LE(0, level_);
level_++;
#endif
return true;
}
SharedMutex::SharedMutex() : native_handle_(SRWLOCK_INIT) {}
SharedMutex::~SharedMutex() {}
void SharedMutex::LockShared() { AcquireSRWLockShared(&native_handle_); }
void SharedMutex::LockExclusive() { AcquireSRWLockExclusive(&native_handle_); }
void SharedMutex::UnlockShared() { ReleaseSRWLockShared(&native_handle_); }
void SharedMutex::UnlockExclusive() {
ReleaseSRWLockExclusive(&native_handle_);
}
bool SharedMutex::TryLockShared() {
return TryAcquireSRWLockShared(&native_handle_);
}
bool SharedMutex::TryLockExclusive() {
return TryAcquireSRWLockExclusive(&native_handle_);
}
#endif // V8_OS_POSIX
} // namespace base
} // namespace v8