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/* spin_mutex.h -*-C++-*-
*
*************************************************************************
*
* @copyright
* Copyright (C) 2009-2011
* Intel Corporation
*
* @copyright
* This file is part of the Intel Cilk Plus Library. This library is free
* software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the
* Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* @copyright
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* @copyright
* Under Section 7 of GPL version 3, you are granted additional
* permissions described in the GCC Runtime Library Exception, version
* 3.1, as published by the Free Software Foundation.
*
* @copyright
* You should have received a copy of the GNU General Public License and
* a copy of the GCC Runtime Library Exception along with this program;
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
* <http://www.gnu.org/licenses/>.
**************************************************************************/
/**
* @file spin_mutex.h
*
* @brief Support for Cilk runtime mutexes.
*
* Cilk runtime mutexes are implemented as simple spin loops.
*
* This file is similar to a worker_mutex, except it does not have an
* owner field.
*
* TBD: This class, worker_mutex, and os_mutex overlap quite a bit in
* functionality. Can we unify these mutexes somehow?
*/
#ifndef INCLUDED_SPIN_MUTEX_DOT_H
#define INCLUDED_SPIN_MUTEX_DOT_H
#include <cilk/common.h>
#include "rts-common.h"
#include "cilk_malloc.h"
__CILKRTS_BEGIN_EXTERN_C
/**
* Mutexes are treated as an abstract data type within the Cilk
* runtime system. They are implemented as simple spin loops.
*/
typedef struct spin_mutex {
/** Mutex spin loop variable. 0 if unowned, 1 if owned. */
volatile int lock;
/** Padding so the mutex takes up a cache line. */
char pad[64/sizeof(int) - 1];
} spin_mutex;
/**
* @brief Create a new Cilk spin_mutex.
*
* @return Returns an initialized spin mutex.
*/
COMMON_PORTABLE
spin_mutex* spin_mutex_create();
/**
* @brief Initialize a Cilk spin_mutex.
*
* @param m Spin_Mutex to be initialized.
*/
COMMON_PORTABLE
void spin_mutex_init(spin_mutex *m);
/**
* @brief Acquire a Cilk spin_mutex.
*
* If statistics are being gathered, the time spent
* acquiring the spin_mutex will be attributed to the specified worker.
*
* @param m Spin_Mutex to be initialized.
*/
COMMON_PORTABLE
void spin_mutex_lock(struct spin_mutex *m);
/**
* @brief Attempt to lock a Cilk spin_mutex and fail if it isn't available.
*
* @param m Spin_Mutex to be acquired.
*
* @return 1 if the spin_mutex was acquired.
* @return 0 if the spin_mutex was not acquired.
*/
COMMON_PORTABLE
int spin_mutex_trylock(struct spin_mutex *m);
/**
* @brief Release a Cilk spin_mutex.
*
* @param m Spin_Mutex to be released.
*/
COMMON_PORTABLE
void spin_mutex_unlock(struct spin_mutex *m);
/**
* @brief Deallocate a Cilk spin_mutex. Currently does nothing.
*
* @param m Spin_Mutex to be deallocated.
*/
COMMON_PORTABLE
void spin_mutex_destroy(struct spin_mutex *m);
__CILKRTS_END_EXTERN_C
#endif // ! defined(INCLUDED_SPIN_MUTEX_DOT_H)
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