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/* os_mutex-unix.c -*-C-*-
*
*************************************************************************
*
* Copyright (C) 2009-2016, 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.
**************************************************************************/
#include "os_mutex.h"
#include "bug.h"
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
// contains notification macros for VTune.
#include "cilk-ittnotify.h"
/*
* OS Mutex functions.
*
* Not to be confused with the spinlock mutexes implemented in cilk_mutex.c
*/
struct os_mutex {
pthread_mutex_t mutex; ///< On Linux, os_mutex is implemented with a pthreads mutex
};
// Unix implementation of the global OS mutex. This will be created by the
// first call to global_os_mutex_lock() and *NEVER* destroyed. On gcc-based
// systems there's no way to guarantee the ordering of constructors and
// destructors, so we can't be guaranteed that our destructor for a static
// object will be called *after* any static destructors that may use Cilk
// in the user's application
static struct os_mutex *global_os_mutex = NULL;
/* Sometimes during shared library load malloc doesn't work.
To handle that case, preallocate space for one mutex. */
static struct os_mutex static_mutex;
static int static_mutex_used;
struct os_mutex *__cilkrts_os_mutex_create(void)
{
int status;
struct os_mutex *mutex = (struct os_mutex *)malloc(sizeof(struct os_mutex));
pthread_mutexattr_t attr;
ITT_SYNC_CREATE(mutex, "OS Mutex");
if (!mutex) {
if (static_mutex_used) {
__cilkrts_bug("Cilk RTS library initialization failed");
} else {
static_mutex_used = 1;
mutex = &static_mutex;
}
}
status = pthread_mutexattr_init(&attr);
CILK_ASSERT (status == 0);
#if defined DEBUG || CILK_LIB_DEBUG
#ifdef PTHREAD_MUTEX_ERRORCHECK
status = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
#else
status = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
#endif
CILK_ASSERT (status == 0);
#endif
status = pthread_mutex_init (&mutex->mutex, &attr);
CILK_ASSERT (status == 0);
pthread_mutexattr_destroy(&attr);
return mutex;
}
void __cilkrts_os_mutex_lock(struct os_mutex *p)
{
int status;
status = pthread_mutex_lock (&p->mutex);
ITT_SYNC_ACQUIRED(p);
if (__builtin_expect(status, 0) == 0)
return;
if (status == EDEADLK)
__cilkrts_bug("Cilk runtime error: deadlock acquiring mutex %p\n",
p);
else
__cilkrts_bug("Cilk runtime error %d acquiring mutex %p\n",
status, p);
}
int __cilkrts_os_mutex_trylock(struct os_mutex *p)
{
int status;
status = pthread_mutex_trylock (&p->mutex);
return (status == 0);
}
void __cilkrts_os_mutex_unlock(struct os_mutex *p)
{
int status;
ITT_SYNC_RELEASING(p);
status = pthread_mutex_unlock (&p->mutex);
CILK_ASSERT(status == 0);
}
void __cilkrts_os_mutex_destroy(struct os_mutex *p)
{
pthread_mutex_destroy (&p->mutex);
if (p == &static_mutex) {
static_mutex_used = 0;
} else {
free(p);
}
}
/*
* create_global_os_mutex
*
* Function used with pthread_once to initialize the global OS mutex. Since
* pthread_once requires a function which takes no parameters and has no
* return value, the global OS mutex will be stored in the static (global
* to the compilation unit) variable "global_os_mutex."
*
*
* global_os_mutex will never be destroyed.
*/
static void create_global_os_mutex(void)
{
CILK_ASSERT(NULL == global_os_mutex);
global_os_mutex = __cilkrts_os_mutex_create();
}
void global_os_mutex_lock(void)
{
// pthread_once_t used with pthread_once to guarantee that
// create_global_os_mutex() is only called once
static pthread_once_t global_os_mutex_is_initialized = PTHREAD_ONCE_INIT;
// Execute create_global_os_mutex once in a thread-safe manner
// Note that create_global_os_mutex returns the mutex in the static
// (global to the module) variable "global_os_mutex"
pthread_once(&global_os_mutex_is_initialized,
create_global_os_mutex);
// We'd better have allocated a global_os_mutex
CILK_ASSERT(NULL != global_os_mutex);
// Acquire the global OS mutex
__cilkrts_os_mutex_lock(global_os_mutex);
}
void global_os_mutex_unlock(void)
{
// We'd better have allocated a global_os_mutex. This means you should
// have called global_os_mutex_lock() before calling
// global_os_mutex_unlock(), but this is the only check for it.
CILK_ASSERT(NULL != global_os_mutex);
// Release the global OS mutex
__cilkrts_os_mutex_unlock(global_os_mutex);
}
/* End os_mutex-unix.c */
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