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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2020 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 (c) 2007 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2019 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2019 Triad National Security, LLC. All rights
* reserved.
*
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OPAL_MCA_THREADS_CONDITION_H
#define OPAL_MCA_THREADS_CONDITION_H
#include "opal_config.h"
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <pthread.h>
#include <time.h>
#include "opal/constants.h"
#include "opal/mca/threads/mutex.h"
#include "opal/runtime/opal_progress.h"
BEGIN_C_DECLS
/*
* 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;
};
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 = OPAL_SUCCESS;
c->c_waiting++;
if (opal_using_threads()) {
if (c->c_signaled) {
c->c_waiting--;
opal_mutex_unlock(m);
opal_progress();
opal_mutex_lock(m);
return rc;
}
while (0 == c->c_signaled) {
opal_mutex_unlock(m);
opal_progress();
opal_mutex_lock(m);
}
} else {
while (0 == c->c_signaled) {
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 absolute;
int rc = OPAL_SUCCESS;
c->c_waiting++;
if (opal_using_threads()) {
absolute.tv_sec = abstime->tv_sec;
absolute.tv_usec = abstime->tv_nsec / 1000;
gettimeofday(&tv, NULL);
if (0 == c->c_signaled) {
do {
opal_mutex_unlock(m);
opal_progress();
gettimeofday(&tv, NULL);
opal_mutex_lock(m);
} while (0 == c->c_signaled
&& (tv.tv_sec <= absolute.tv_sec
|| (tv.tv_sec == absolute.tv_sec && tv.tv_usec < absolute.tv_usec)));
}
} else {
absolute.tv_sec = abstime->tv_sec;
absolute.tv_usec = abstime->tv_nsec / 1000;
gettimeofday(&tv, NULL);
if (0 == c->c_signaled) {
do {
opal_progress();
gettimeofday(&tv, NULL);
} while (0 == c->c_signaled
&& (tv.tv_sec <= absolute.tv_sec
|| (tv.tv_sec == absolute.tv_sec && tv.tv_usec < absolute.tv_usec)));
}
}
if (0 != c->c_signaled) {
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++;
}
return OPAL_SUCCESS;
}
static inline int opal_condition_broadcast(opal_condition_t *c)
{
c->c_signaled = c->c_waiting;
return OPAL_SUCCESS;
}
END_C_DECLS
#endif /* OPAL_MCA_THREADS_CONDITION_H */
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