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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "Monitor.h"
#include "Exception.h"
#include "Util.h"
#include <assert.h>
#include <errno.h>
#include <iostream>
#include <pthread.h>
namespace apache { namespace thrift { namespace concurrency {
/**
* Monitor implementation using the POSIX pthread library
*
* @version $Id:$
*/
class Monitor::Impl {
public:
Impl() :
mutexInitialized_(false),
condInitialized_(false) {
if (pthread_mutex_init(&pthread_mutex_, NULL) == 0) {
mutexInitialized_ = true;
if (pthread_cond_init(&pthread_cond_, NULL) == 0) {
condInitialized_ = true;
}
}
if (!mutexInitialized_ || !condInitialized_) {
cleanup();
throw SystemResourceException();
}
}
~Impl() { cleanup(); }
void lock() const { pthread_mutex_lock(&pthread_mutex_); }
void unlock() const { pthread_mutex_unlock(&pthread_mutex_); }
void wait(int64_t timeout) const {
// XXX Need to assert that caller owns mutex
assert(timeout >= 0LL);
if (timeout == 0LL) {
int iret = pthread_cond_wait(&pthread_cond_, &pthread_mutex_);
assert(iret == 0);
} else {
struct timespec abstime;
int64_t now = Util::currentTime();
Util::toTimespec(abstime, now + timeout);
int result = pthread_cond_timedwait(&pthread_cond_,
&pthread_mutex_,
&abstime);
if (result == ETIMEDOUT) {
// pthread_cond_timedwait has been observed to return early on
// various platforms, so comment out this assert.
//assert(Util::currentTime() >= (now + timeout));
throw TimedOutException();
}
}
}
void notify() {
// XXX Need to assert that caller owns mutex
int iret = pthread_cond_signal(&pthread_cond_);
assert(iret == 0);
}
void notifyAll() {
// XXX Need to assert that caller owns mutex
int iret = pthread_cond_broadcast(&pthread_cond_);
assert(iret == 0);
}
private:
void cleanup() {
if (mutexInitialized_) {
mutexInitialized_ = false;
int iret = pthread_mutex_destroy(&pthread_mutex_);
assert(iret == 0);
}
if (condInitialized_) {
condInitialized_ = false;
int iret = pthread_cond_destroy(&pthread_cond_);
assert(iret == 0);
}
}
mutable pthread_mutex_t pthread_mutex_;
mutable bool mutexInitialized_;
mutable pthread_cond_t pthread_cond_;
mutable bool condInitialized_;
};
Monitor::Monitor() : impl_(new Monitor::Impl()) {}
Monitor::~Monitor() { delete impl_; }
void Monitor::lock() const { impl_->lock(); }
void Monitor::unlock() const { impl_->unlock(); }
void Monitor::wait(int64_t timeout) const { impl_->wait(timeout); }
void Monitor::notify() const { impl_->notify(); }
void Monitor::notifyAll() const { impl_->notifyAll(); }
}}} // apache::thrift::concurrency
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