Joseph Macaranas
95 řádky
3.0 KiB
C++
95 řádky
3.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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//
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// The University of Illinois/NCSA
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// Open Source License (NCSA)
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//
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// Copyright (c) 2014-2016, Advanced Micro Devices, Inc. All rights reserved.
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//
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// Developed by:
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//
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// AMD Research and AMD HSA Software Development
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//
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// Advanced Micro Devices, Inc.
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//
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// www.amd.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal with the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// - Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimers.
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// - Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimers in
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// the documentation and/or other materials provided with the distribution.
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// - Neither the names of Advanced Micro Devices, Inc,
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// nor the names of its contributors may be used to endorse or promote
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// products derived from this Software without specific prior written
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// permission.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS WITH THE SOFTWARE.
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//
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////////////////////////////////////////////////////////////////////////////////
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#include "amd_hsa_locks.hpp"
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namespace amd {
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namespace hsa {
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namespace common {
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void ReaderWriterLock::ReaderLock()
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{
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internal_lock_.lock();
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while (0 < writers_count_) {
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readers_condition_.wait(internal_lock_);
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}
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readers_count_ += 1;
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internal_lock_.unlock();
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}
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void ReaderWriterLock::ReaderUnlock()
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{
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internal_lock_.lock();
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readers_count_ -= 1;
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if (0 == readers_count_ && 0 < writers_waiting_) {
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writers_condition_.notify_one();
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}
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internal_lock_.unlock();
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}
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void ReaderWriterLock::WriterLock()
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{
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internal_lock_.lock();
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writers_waiting_ += 1;
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while (0 < readers_count_ || 0 < writers_count_) {
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writers_condition_.wait(internal_lock_);
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}
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writers_count_ += 1;
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writers_waiting_ -= 1;
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internal_lock_.unlock();
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}
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void ReaderWriterLock::WriterUnlock()
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{
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internal_lock_.lock();
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writers_count_ -= 1;
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if (0 < writers_waiting_) {
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writers_condition_.notify_one();
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}
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readers_condition_.notify_all();
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internal_lock_.unlock();
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}
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} // namespace common
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} // namespace hsa
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} // namespace amd
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