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// synchronization.cpp
/* Copyright 2010 10gen Inc.
*
* 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 "pch.h"
#include "synchronization.h"
namespace mongo {
Notification::Notification() : _mutex ( "Notification" ){
lookFor = 1;
cur = 0;
}
Notification::~Notification() { }
void Notification::waitToBeNotified() {
scoped_lock lock( _mutex );
while ( lookFor != cur )
_condition.wait( lock.boost() );
lookFor++;
}
void Notification::notifyOne() {
scoped_lock lock( _mutex );
assert( cur != lookFor );
cur++;
_condition.notify_one();
}
/* --- NotifyAll --- */
NotifyAll::NotifyAll() : _mutex("NotifyAll") {
_lastDone = 0;
_lastReturned = 0;
_nWaiting = 0;
}
NotifyAll::When NotifyAll::now() {
scoped_lock lock( _mutex );
return ++_lastReturned;
}
void NotifyAll::waitFor(When e) {
scoped_lock lock( _mutex );
++_nWaiting;
while( _lastDone < e ) {
_condition.wait( lock.boost() );
}
}
void NotifyAll::awaitBeyondNow() {
scoped_lock lock( _mutex );
++_nWaiting;
When e = ++_lastReturned;
while( _lastDone <= e ) {
_condition.wait( lock.boost() );
}
}
void NotifyAll::notifyAll(When e) {
scoped_lock lock( _mutex );
_lastDone = e;
_nWaiting = 0;
_condition.notify_all();
}
} // namespace mongo
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