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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 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) 2007-2018 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2015-2016 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2019 Sandia National Laboratories. All rights reserved.
* Copyright (c) 2020 Triad National Security, LLC. All rights
* reserved.
*
* Copyright (c) 2020 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2021 Argonne National Laboratory. All rights reserved.
* Copyright (c) 2022 Sandia National Laboratories. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef OPAL_MCA_THREADS_QTHREADS_THREADS_QTHREADS_MUTEX_H
#define OPAL_MCA_THREADS_QTHREADS_THREADS_QTHREADS_MUTEX_H 1
#include "opal_config.h"
#include <stdio.h>
#include "opal/class/opal_object.h"
#include "opal/constants.h"
#include "opal/mca/threads/qthreads/threads_qthreads.h"
#include "opal/sys/atomic.h"
#include "opal/util/show_help.h"
BEGIN_C_DECLS
typedef qthread_spinlock_t opal_thread_internal_mutex_t;
#define OPAL_THREAD_INTERNAL_MUTEX_INITIALIZER QTHREAD_MUTEX_INITIALIZER
#define OPAL_THREAD_INTERNAL_RECURSIVE_MUTEX_INITIALIZER QTHREAD_RECURSIVE_MUTEX_INITIALIZER
static inline int opal_thread_internal_mutex_init(opal_thread_internal_mutex_t *p_mutex,
bool recursive)
{
opal_threads_ensure_init_qthreads();
#if OPAL_ENABLE_DEBUG
int ret = qthread_spinlock_init(p_mutex,recursive);
if (QTHREAD_SUCCESS != ret) {
opal_show_help("help-opal-threads.txt", "mutex init failed", true);
}
#else
qthread_spinlock_init(p_mutex,recursive);
#endif
return OPAL_SUCCESS;
}
static inline void opal_thread_internal_mutex_lock(opal_thread_internal_mutex_t *p_mutex)
{
opal_threads_ensure_init_qthreads();
#if OPAL_ENABLE_DEBUG
int ret = qthread_spinlock_lock(p_mutex);
if (QTHREAD_SUCCESS != ret) {
opal_show_help("help-opal-threads.txt", "mutex lock failed", true);
}
#else
qthread_spinlock_lock(p_mutex);
#endif
}
static inline int opal_thread_internal_mutex_trylock(opal_thread_internal_mutex_t *p_mutex)
{
opal_threads_ensure_init_qthreads();
int ret = qthread_spinlock_trylock(p_mutex);
if (QTHREAD_OPFAIL == ret) {
return 1;
} else if (QTHREAD_SUCCESS != ret) {
#if OPAL_ENABLE_DEBUG
opal_show_help("help-opal-threads.txt", "mutex trylock failed", true);
#endif
return 1;
}
return 0;
}
static inline void opal_thread_internal_mutex_unlock(opal_thread_internal_mutex_t *p_mutex)
{
opal_threads_ensure_init_qthreads();
int ret;
#if OPAL_ENABLE_DEBUG
ret = qthread_spinlock_unlock(p_mutex);
if (QTHREAD_SUCCESS != ret) {
opal_show_help("help-opal-threads.txt", "mutex unlock failed", true);
}
#else
qthread_spinlock_unlock(p_mutex);
#endif
/* For fairness of locking. */
qthread_yield();
}
static inline void opal_thread_internal_mutex_destroy(opal_thread_internal_mutex_t *p_mutex)
{
/* No specific operation is needed to destroy opal_thread_internal_mutex_t. */
}
typedef struct opal_thread_cond_waiter_t {
int m_signaled;
struct opal_thread_cond_waiter_t *m_prev;
} opal_thread_cond_waiter_t;
typedef struct {
opal_thread_internal_mutex_t m_lock;
opal_thread_cond_waiter_t *m_waiter_head;
opal_thread_cond_waiter_t *m_waiter_tail;
} opal_thread_internal_cond_t;
#define OPAL_THREAD_INTERNAL_COND_INITIALIZER \
{ \
.m_lock = QTHREAD_MUTEX_INITIALIZER, .m_waiter_head = NULL, .m_waiter_tail = NULL, \
}
static inline int opal_thread_internal_cond_init(opal_thread_internal_cond_t *p_cond)
{
qthread_spinlock_init(&p_cond->m_lock, false /* is_recursive */);
p_cond->m_waiter_head = NULL;
p_cond->m_waiter_tail = NULL;
return OPAL_SUCCESS;
}
static inline void opal_thread_internal_cond_wait(opal_thread_internal_cond_t *p_cond,
opal_thread_internal_mutex_t *p_mutex)
{
opal_threads_ensure_init_qthreads();
/* This thread is taking "lock", so only this thread can access this
* condition variable. */
qthread_spinlock_lock(&p_cond->m_lock);
opal_thread_cond_waiter_t waiter = {0, NULL};
if (NULL == p_cond->m_waiter_head) {
p_cond->m_waiter_tail = &waiter;
} else {
p_cond->m_waiter_head->m_prev = &waiter;
}
p_cond->m_waiter_head = &waiter;
qthread_spinlock_unlock(&p_cond->m_lock);
while (1) {
opal_thread_internal_mutex_unlock(p_mutex);
qthread_yield();
opal_thread_internal_mutex_lock(p_mutex);
/* Check if someone woke me up. */
qthread_spinlock_lock(&p_cond->m_lock);
int signaled = waiter.m_signaled;
qthread_spinlock_unlock(&p_cond->m_lock);
if (1 == signaled) {
break;
}
/* Unlock the lock again. */
}
}
static inline void opal_thread_internal_cond_broadcast(opal_thread_internal_cond_t *p_cond)
{
qthread_spinlock_lock(&p_cond->m_lock);
while (NULL != p_cond->m_waiter_tail) {
opal_thread_cond_waiter_t *p_cur_tail = p_cond->m_waiter_tail;
p_cond->m_waiter_tail = p_cur_tail->m_prev;
/* Awaken one of threads in a FIFO manner. */
p_cur_tail->m_signaled = 1;
}
/* No waiters. */
p_cond->m_waiter_head = NULL;
qthread_spinlock_unlock(&p_cond->m_lock);
}
static inline void opal_thread_internal_cond_signal(opal_thread_internal_cond_t *p_cond)
{
qthread_spinlock_lock(&p_cond->m_lock);
if (NULL != p_cond->m_waiter_tail) {
opal_thread_cond_waiter_t *p_cur_tail = p_cond->m_waiter_tail;
p_cond->m_waiter_tail = p_cur_tail->m_prev;
/* Awaken one of threads. */
p_cur_tail->m_signaled = 1;
if (NULL == p_cond->m_waiter_tail) {
p_cond->m_waiter_head = NULL;
}
}
qthread_spinlock_unlock(&p_cond->m_lock);
}
static inline void opal_thread_internal_cond_destroy(opal_thread_internal_cond_t *p_cond)
{
/* No destructor is needed. */
}
END_C_DECLS
#endif /* OPAL_MCA_THREADS_QTHREADS_THREADS_QTHREADS_MUTEX_H */
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