cavis/libnd4j/include/helpers/impl/SimpleReadWriteLock.cpp

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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
//
// Created by raver on 8/29/2018.
//
#include <helpers/SimpleReadWriteLock.h>
namespace sd {
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SimpleReadWriteLock::SimpleReadWriteLock(const SimpleReadWriteLock& other) {
_read_locks.store(other._read_locks.load());
_write_locks.store(other._write_locks.load());
}
SimpleReadWriteLock::SimpleReadWriteLock(){
_read_locks.store(0);
_write_locks.store(0);
}
void SimpleReadWriteLock::lockRead() {
_mutex.lock();
_read_locks++;
while(_write_locks.load() > 0) {
// just loop
}
_mutex.unlock();
}
void SimpleReadWriteLock::unlockRead() {
_read_locks--;
}
// write lock
void SimpleReadWriteLock::lockWrite() {
_mutex.lock();
_write_locks++;
while (_read_locks.load() > 0) {
// just loop
}
_mutex.unlock();
}
void SimpleReadWriteLock::unlockWrite() {
_write_locks--;
}
SimpleReadWriteLock& SimpleReadWriteLock::operator= ( const SimpleReadWriteLock &other) {
if (this == &other) return *this;
this->_write_locks.store(other._write_locks.load());
this->_read_locks.store(other._read_locks.load());
return *this;
}
}