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/**
* Copyright (c) 2013-2021 UChicago Argonne, LLC and The HDF Group.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef MERCURY_THREAD_CONDITION_H
#define MERCURY_THREAD_CONDITION_H
#include "mercury_thread_mutex.h"
#ifdef _WIN32
typedef CONDITION_VARIABLE hg_thread_cond_t;
#else
#if defined(HG_UTIL_HAS_PTHREAD_CONDATTR_SETCLOCK) && defined(HG_UTIL_HAS_CLOCK_MONOTONIC_COARSE)
#include <time.h>
#elif defined(HG_UTIL_HAS_SYSTIME_H)
#include <sys/time.h>
#endif
#include <stdlib.h>
typedef pthread_cond_t hg_thread_cond_t;
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* Initialize the condition.
*
* \param cond [IN/OUT] pointer to condition object
*
* \return Non-negative on success or negative on failure
*/
HG_UTIL_PUBLIC int hg_thread_cond_init(hg_thread_cond_t *cond);
/**
* Destroy the condition.
*
* \param cond [IN/OUT] pointer to condition object
*
* \return Non-negative on success or negative on failure
*/
HG_UTIL_PUBLIC int hg_thread_cond_destroy(hg_thread_cond_t *cond);
/**
* Wake one thread waiting for the condition to change.
*
* \param cond [IN/OUT] pointer to condition object
*
* \return Non-negative on success or negative on failure
*/
static HG_UTIL_INLINE int hg_thread_cond_signal(hg_thread_cond_t *cond);
/**
* Wake all the threads waiting for the condition to change.
*
* \param cond [IN/OUT] pointer to condition object
*
* \return Non-negative on success or negative on failure
*/
static HG_UTIL_INLINE int hg_thread_cond_broadcast(hg_thread_cond_t *cond);
/**
* Wait for the condition to change.
*
* \param cond [IN/OUT] pointer to condition object
* \param mutex [IN/OUT] pointer to mutex object
*
* \return Non-negative on success or negative on failure
*/
static HG_UTIL_INLINE int hg_thread_cond_wait(hg_thread_cond_t *cond, hg_thread_mutex_t *mutex);
/**
* Wait timeout ms for the condition to change.
*
* \param cond [IN/OUT] pointer to condition object
* \param mutex [IN/OUT] pointer to mutex object
* \param timeout [IN] timeout (in milliseconds)
*
* \return Non-negative on success or negative on failure
*/
static HG_UTIL_INLINE int hg_thread_cond_timedwait(hg_thread_cond_t *cond, hg_thread_mutex_t *mutex,
unsigned int timeout);
/*---------------------------------------------------------------------------*/
static HG_UTIL_INLINE int
hg_thread_cond_signal(hg_thread_cond_t *cond)
{
#ifdef _WIN32
WakeConditionVariable(cond);
#else
if (pthread_cond_signal(cond))
return HG_UTIL_FAIL;
#endif
return HG_UTIL_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static HG_UTIL_INLINE int
hg_thread_cond_broadcast(hg_thread_cond_t *cond)
{
#ifdef _WIN32
WakeAllConditionVariable(cond);
#else
if (pthread_cond_broadcast(cond))
return HG_UTIL_FAIL;
#endif
return HG_UTIL_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static HG_UTIL_INLINE int
hg_thread_cond_wait(hg_thread_cond_t *cond, hg_thread_mutex_t *mutex)
{
#ifdef _WIN32
if (!SleepConditionVariableCS(cond, mutex, INFINITE))
return HG_UTIL_FAIL;
#else
if (pthread_cond_wait(cond, mutex))
return HG_UTIL_FAIL;
#endif
return HG_UTIL_SUCCESS;
}
/*---------------------------------------------------------------------------*/
static HG_UTIL_INLINE int
hg_thread_cond_timedwait(hg_thread_cond_t *cond, hg_thread_mutex_t *mutex, unsigned int timeout)
{
#ifdef _WIN32
if (!SleepConditionVariableCS(cond, mutex, timeout))
return HG_UTIL_FAIL;
#else
#if defined(HG_UTIL_HAS_PTHREAD_CONDATTR_SETCLOCK) && defined(HG_UTIL_HAS_CLOCK_MONOTONIC_COARSE)
struct timespec now;
#else
struct timeval now;
#endif
struct timespec abs_timeout;
ldiv_t ld;
/* Need to convert timeout (ms) to absolute time */
#if defined(HG_UTIL_HAS_PTHREAD_CONDATTR_SETCLOCK) && defined(HG_UTIL_HAS_CLOCK_MONOTONIC_COARSE)
clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
/* Get sec / nsec */
ld = ldiv(now.tv_nsec + timeout * 1000000L, 1000000000L);
abs_timeout.tv_nsec = ld.rem;
#elif defined(HG_UTIL_HAS_SYSTIME_H)
gettimeofday(&now, NULL);
/* Get sec / usec */
ld = ldiv(now.tv_usec + timeout * 1000L, 1000000L);
abs_timeout.tv_nsec = ld.rem * 1000L;
#endif
abs_timeout.tv_sec = now.tv_sec + ld.quot;
if (pthread_cond_timedwait(cond, mutex, &abs_timeout))
return HG_UTIL_FAIL;
#endif
return HG_UTIL_SUCCESS;
}
#ifdef __cplusplus
}
#endif
#endif /* MERCURY_THREAD_CONDITION_H */
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