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