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