132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
/* worker_mutex.h -*-C++-*-
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*
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*************************************************************************
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*
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* @copyright
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* Copyright (C) 2009-2013, Intel Corporation
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* All rights reserved.
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*
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* @copyright
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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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* @copyright
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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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* @file worker_mutex.h
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*
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* @brief Support for Cilk runtime mutexes.
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*
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* Cilk runtime mutexes are implemented as simple spin loops.
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*/
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#ifndef INCLUDED_WORKER_MUTEX_DOT_H
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#define INCLUDED_WORKER_MUTEX_DOT_H
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#include <cilk/common.h>
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#include "rts-common.h"
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__CILKRTS_BEGIN_EXTERN_C
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/**
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* Mutexes are treated as an abstract data type within the Cilk
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* runtime system. They are implemented as simple spin loops and
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* owned by a __cilkrts_worker.
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*/
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typedef struct mutex {
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/** Mutex spin loop variable. 0 if unowned, 1 if owned. */
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volatile int lock;
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/** Worker that owns the mutex. Must be 0 if mutex is unowned. */
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__cilkrts_worker *owner;
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} mutex;
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/**
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* @brief Initialize a Cilk mutex.
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*
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* @param m Mutex to be initialized.
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*/
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COMMON_PORTABLE
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void __cilkrts_mutex_init(struct mutex *m);
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/**
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* @brief Acquire a Cilk mutex.
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*
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* If statistics are being gathered, the time spent
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* acquiring the mutex will be attributed to the specified worker.
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*
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* @param w Worker that will become the owner of this mutex.
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* @param m Mutex to be initialized.
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*/
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COMMON_PORTABLE
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void __cilkrts_mutex_lock(__cilkrts_worker *w,
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struct mutex *m);
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/**
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* @brief Attempt to lock a Cilk mutex and fail if it isn't available.
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*
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* If statistics are being gathered, the time spent acquiring the
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* mutex will be attributed to the specified worker.
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*
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* @param w Worker that will become the owner of this mutex.
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* @param m Mutex to be acquired.
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*
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* @return 1 if the mutex was acquired.
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* @return 0 if the mutex was not acquired.
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*/
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COMMON_PORTABLE
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int __cilkrts_mutex_trylock(__cilkrts_worker *w,
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struct mutex *m);
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/**
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* @brief Release a Cilk mutex.
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*
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* If statistics are being gathered, the time spent
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* acquiring the mutex will be attributed to the specified worker.
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*
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* @pre The mutex must be owned by the worker.
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*
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* @param w Worker that owns this mutex.
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* @param m Mutex to be released.
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*/
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COMMON_PORTABLE
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void __cilkrts_mutex_unlock(__cilkrts_worker *w,
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struct mutex *m);
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/**
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* @brief Deallocate a Cilk mutex. Currently does nothing.
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*
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* @param w Unused.
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* @param m Mutex to be deallocated.
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*/
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COMMON_PORTABLE
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void __cilkrts_mutex_destroy(__cilkrts_worker *w,
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struct mutex *m);
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__CILKRTS_END_EXTERN_C
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#endif // ! defined(INCLUDED_WORKER_MUTEX_DOT_H)
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