78 lines
2 KiB
C++
78 lines
2 KiB
C++
// synchronization.cpp
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/* Copyright 2010 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "pch.h"
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#include "synchronization.h"
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namespace mongo {
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Notification::Notification() : _mutex ( "Notification" ) , _notified( false ) {
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}
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Notification::~Notification() { }
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void Notification::waitToBeNotified() {
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scoped_lock lock( _mutex );
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while ( ! _notified )
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_condition.wait( lock.boost() );
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}
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void Notification::notifyOne() {
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scoped_lock lock( _mutex );
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assert( !_notified );
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_notified = true;
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_condition.notify_one();
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}
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/* --- NotifyAll --- */
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NotifyAll::NotifyAll() : _mutex("NotifyAll") {
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_lastDone = 0;
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_lastReturned = 0;
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_nWaiting = 0;
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}
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NotifyAll::When NotifyAll::now() {
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scoped_lock lock( _mutex );
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return ++_lastReturned;
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}
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void NotifyAll::waitFor(When e) {
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scoped_lock lock( _mutex );
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++_nWaiting;
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while( _lastDone < e ) {
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_condition.wait( lock.boost() );
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}
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}
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void NotifyAll::awaitBeyondNow() {
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scoped_lock lock( _mutex );
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++_nWaiting;
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When e = ++_lastReturned;
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while( _lastDone <= e ) {
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_condition.wait( lock.boost() );
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}
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}
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void NotifyAll::notifyAll(When e) {
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scoped_lock lock( _mutex );
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_lastDone = e;
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_nWaiting = 0;
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_condition.notify_all();
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}
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} // namespace mongo
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