blob: 25d8b76d693097ae336992954e882e41661f732e [file] [log] [blame]
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mutex.h"
#include <errno.h>
#include "heap.h" // for VERIFY_OBJECT_ENABLED
#include "logging.h"
#include "utils.h"
#define CHECK_MUTEX_CALL(call, args) CHECK_PTHREAD_CALL(call, args, name_)
namespace art {
Mutex::Mutex(const char* name) : name_(name) {
#ifndef NDEBUG
pthread_mutexattr_t debug_attributes;
CHECK_MUTEX_CALL(pthread_mutexattr_init, (&debug_attributes));
#if VERIFY_OBJECT_ENABLED
CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&debug_attributes, PTHREAD_MUTEX_RECURSIVE));
#else
CHECK_MUTEX_CALL(pthread_mutexattr_settype, (&debug_attributes, PTHREAD_MUTEX_ERRORCHECK));
#endif
CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, &debug_attributes));
CHECK_MUTEX_CALL(pthread_mutexattr_destroy, (&debug_attributes));
#else
CHECK_MUTEX_CALL(pthread_mutex_init, (&mutex_, NULL));
#endif
}
Mutex::~Mutex() {
CHECK_MUTEX_CALL(pthread_mutex_destroy, (&mutex_));
}
void Mutex::Lock() {
CHECK_MUTEX_CALL(pthread_mutex_lock, (&mutex_));
}
bool Mutex::TryLock() {
int result = pthread_mutex_trylock(&mutex_);
if (result == EBUSY) {
return false;
}
if (result != 0) {
errno = result;
PLOG(FATAL) << "pthread_mutex_trylock failed for " << name_;
}
return true;
}
void Mutex::Unlock() {
CHECK_MUTEX_CALL(pthread_mutex_unlock, (&mutex_));
}
pid_t Mutex::GetOwner() {
#if defined(__BIONIC__)
return static_cast<pid_t>((mutex_.value >> 16) & 0xffff);
#elif defined(__GLIBC__)
struct __attribute__((__may_alias__)) glibc_pthread_t {
int lock;
unsigned int count;
int owner;
// ...other stuff we don't care about.
};
return reinterpret_cast<glibc_pthread_t*>(&mutex_)->owner;
#else
UNIMPLEMENTED(FATAL);
return 0;
#endif
}
void Mutex::ClearOwner() {
#if defined(__BIONIC__)
mutex_.value = 0;
#elif defined(__GLIBC__)
struct __attribute__((__may_alias__)) glibc_pthread_t {
int lock;
unsigned int count;
int owner;
// ...other stuff we don't care about.
};
reinterpret_cast<glibc_pthread_t*>(&mutex_)->owner = 0;
#else
UNIMPLEMENTED(FATAL);
return 0;
#endif
}
pid_t Mutex::GetTid() {
return art::GetTid();
}
ConditionVariable::ConditionVariable(const std::string& name) : name_(name) {
CHECK_MUTEX_CALL(pthread_cond_init, (&cond_, NULL));
}
ConditionVariable::~ConditionVariable() {
CHECK_MUTEX_CALL(pthread_cond_destroy, (&cond_));
}
void ConditionVariable::Broadcast() {
CHECK_MUTEX_CALL(pthread_cond_broadcast, (&cond_));
}
void ConditionVariable::Signal() {
CHECK_MUTEX_CALL(pthread_cond_signal, (&cond_));
}
void ConditionVariable::Wait(Mutex& mutex) {
CHECK_MUTEX_CALL(pthread_cond_wait, (&cond_, mutex.GetImpl()));
}
void ConditionVariable::TimedWait(Mutex& mutex, const timespec& ts) {
#ifdef HAVE_TIMEDWAIT_MONOTONIC
#define TIMEDWAIT pthread_cond_timedwait_monotonic
#else
#define TIMEDWAIT pthread_cond_timedwait
#endif
int rc = TIMEDWAIT(&cond_, mutex.GetImpl(), &ts);
if (rc != 0 && rc != ETIMEDOUT) {
errno = rc;
PLOG(FATAL) << "TimedWait failed for " << name_;
}
}
} // namespace