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104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
/* fake_mutex.h -*-C++-*-
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*
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*************************************************************************
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*
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* Copyright (C) 2013-2016, Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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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 disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* *********************************************************************
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*
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* PLEASE NOTE: This file is a downstream copy of a file mainitained in
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* a repository at cilkplus.org. Changes made to this file that are not
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* submitted through the contribution process detailed at
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* http://www.cilkplus.org/submit-cilk-contribution will be lost the next
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* time that a new version is released. Changes only submitted to the
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* GNU compiler collection or posted to the git repository at
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* https://bitbucket.org/intelcilkruntime/intel-cilk-runtime.git are
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* not tracked.
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*
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* We welcome your contributions to this open source project. Thank you
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* for your assistance in helping us improve Cilk Plus.
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*
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**************************************************************************
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*
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* Cilkscreen fake mutexes are provided to indicate to the Cilkscreen race
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* detector that a race should be ignored.
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*
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* NOTE: This class does not provide mutual exclusion. You should use the
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* mutual exclusion constructs provided by TBB or your operating system to
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* protect against real data races.
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*/
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#ifndef FAKE_MUTEX_H_INCLUDED
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#define FAKE_MUTEX_H_INCLUDED
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#include <cilktools/cilkscreen.h>
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namespace cilkscreen
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{
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class fake_mutex
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{
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public:
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fake_mutex() : locked(false)
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{
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}
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~fake_mutex()
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{
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__CILKRTS_ASSERT(! locked);
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}
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// Wait until mutex is available, then enter
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void lock()
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{
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__cilkscreen_acquire_lock(&locked);
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__CILKRTS_ASSERT(! locked);
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locked = true;
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}
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// A fake mutex is always available
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bool try_lock() { lock(); return true; }
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// Releases the mutex
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void unlock()
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{
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__CILKRTS_ASSERT(locked);
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locked = false;
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__cilkscreen_release_lock(&locked);
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}
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private:
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bool locked;
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};
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} // namespace cilk
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#endif // FAKE_MUTEX_H_INCLUDED
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