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////////////////////////////////////////////////////////////////////////////////
//
// The University of Illinois/NCSA
// Open Source License (NCSA)
//
// Copyright (c) 2014-2020, Advanced Micro Devices, Inc. All rights reserved.
//
// Developed by:
//
// AMD Research and AMD HSA Software Development
//
// Advanced Micro Devices, Inc.
//
// www.amd.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal with the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimers.
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimers in
// the documentation and/or other materials provided with the distribution.
// - Neither the names of Advanced Micro Devices, Inc,
// nor the names of its contributors may be used to endorse or promote
// products derived from this Software without specific prior written
// permission.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS WITH THE SOFTWARE.
//
////////////////////////////////////////////////////////////////////////////////
#include "amd_hsa_locks.hpp"
namespace rocr {
namespace amd {
namespace hsa {
namespace common {
void ReaderWriterLock::ReaderLock()
{
internal_lock_.lock();
while (0 < writers_count_) {
readers_condition_.wait(internal_lock_);
}
readers_count_ += 1;
internal_lock_.unlock();
}
void ReaderWriterLock::ReaderUnlock()
{
internal_lock_.lock();
readers_count_ -= 1;
if (0 == readers_count_ && 0 < writers_waiting_) {
writers_condition_.notify_one();
}
internal_lock_.unlock();
}
void ReaderWriterLock::WriterLock()
{
internal_lock_.lock();
writers_waiting_ += 1;
while (0 < readers_count_ || 0 < writers_count_) {
writers_condition_.wait(internal_lock_);
}
writers_count_ += 1;
writers_waiting_ -= 1;
internal_lock_.unlock();
}
void ReaderWriterLock::WriterUnlock()
{
internal_lock_.lock();
writers_count_ -= 1;
if (0 < writers_waiting_) {
writers_condition_.notify_one();
}
readers_condition_.notify_all();
internal_lock_.unlock();
}
} // namespace common
} // namespace hsa
} // namespace amd
} // namespace rocr
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