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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OPAL_CONDITION_SPINLOCK_H
#define OPAL_CONDITION_SPINLOCK_H
#include "opal_config.h"
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#if OMPI_HAVE_POSIX_THREADS
#include <pthread.h>
#endif
#include "opal/threads/condition.h"
#include "opal/threads/mutex.h"
#include "opal/runtime/opal_progress.h"
#if defined(c_plusplus) || defined(__cplusplus)
extern "C" {
#endif
/*
* Combine pthread support w/ polled progress to allow run-time selection
* of threading vs. non-threading progress.
*/
struct opal_condition_t {
opal_object_t super;
volatile int c_waiting;
volatile int c_signaled;
#if OMPI_HAVE_POSIX_THREADS
pthread_cond_t c_cond;
#endif
};
typedef struct opal_condition_t opal_condition_t;
OPAL_DECLSPEC OBJ_CLASS_DECLARATION(opal_condition_t);
static inline int opal_condition_wait(opal_condition_t *c, opal_mutex_t *m)
{
int rc = 0;
c->c_waiting++;
if (opal_using_threads()) {
#if OMPI_HAVE_POSIX_THREADS && OMPI_ENABLE_PROGRESS_THREADS
rc = pthread_cond_wait(&c->c_cond, &m->m_lock_pthread);
#else
if (c->c_signaled) {
c->c_waiting--;
opal_mutex_unlock(m);
opal_progress();
opal_mutex_lock(m);
return 0;
}
while (c->c_signaled == 0) {
opal_mutex_unlock(m);
opal_progress();
opal_mutex_lock(m);
}
#endif
} else {
while (c->c_signaled == 0) {
opal_progress();
}
}
c->c_signaled--;
c->c_waiting--;
return rc;
}
static inline int opal_condition_timedwait(opal_condition_t *c,
opal_mutex_t *m,
const struct timespec *abstime)
{
struct timeval tv;
struct timeval abs;
int rc = 0;
c->c_waiting++;
if (opal_using_threads()) {
#if OMPI_HAVE_POSIX_THREADS && OMPI_ENABLE_PROGRESS_THREADS
rc = pthread_cond_timedwait(&c->c_cond, &m->m_lock_pthread, abstime);
#else
abs.tv_sec = abstime->tv_sec;
abs.tv_usec = abstime->tv_nsec * 1000;
gettimeofday(&tv,NULL);
while (c->c_signaled == 0 &&
(tv.tv_sec <= abs.tv_sec ||
(tv.tv_sec == abs.tv_sec && tv.tv_usec < abs.tv_usec))) {
opal_mutex_unlock(m);
opal_progress();
gettimeofday(&tv,NULL);
opal_mutex_lock(m);
}
#endif
} else {
abs.tv_sec = abstime->tv_sec;
abs.tv_usec = abstime->tv_nsec * 1000;
gettimeofday(&tv,NULL);
while (c->c_signaled == 0 &&
(tv.tv_sec <= abs.tv_sec ||
(tv.tv_sec == abs.tv_sec && tv.tv_usec < abs.tv_usec))) {
opal_progress();
gettimeofday(&tv,NULL);
}
}
c->c_signaled--;
c->c_waiting--;
return rc;
}
static inline int opal_condition_signal(opal_condition_t *c)
{
if (c->c_waiting) {
c->c_signaled++;
#if OMPI_HAVE_POSIX_THREADS && OMPI_ENABLE_PROGRESS_THREADS
if(opal_using_threads()) {
pthread_cond_signal(&c->c_cond);
}
#endif
}
return 0;
}
static inline int opal_condition_broadcast(opal_condition_t *c)
{
c->c_signaled = c->c_waiting;
#if OMPI_HAVE_POSIX_THREADS && OMPI_ENABLE_PROGRESS_THREADS
if(opal_using_threads()) {
if( 1 == c->c_waiting ) {
pthread_cond_signal(&c->c_cond);
} else {
pthread_cond_broadcast(&c->c_cond);
}
}
#endif
return 0;
}
#if defined(c_plusplus) || defined(__cplusplus)
}
#endif
#endif
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