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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) 2004-2021 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) 2019 Triad National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal/constants.h"
#include "opal/mca/threads/qthreads/threads_qthreads.h"
#include "opal/mca/threads/threads.h"
#include "opal/mca/threads/tsd.h"
struct opal_tsd_key_value {
opal_tsd_key_t key;
opal_tsd_destructor_t destructor;
};
/* false: uninitialized, true: initialized. */
static opal_atomic_lock_t opal_thread_self_key_lock = OPAL_ATOMIC_LOCK_INIT;
static bool opal_thread_self_key_init = false;
static opal_tsd_key_t opal_thread_self_key;
static inline void self_key_ensure_init(void)
{
if (false == opal_thread_self_key_init) {
/* not initialized yet. */
opal_atomic_lock(&opal_thread_self_key_lock);
/* check again. */
if (false == opal_thread_self_key_init) {
/* This thread is responsible for initializing this key. */
qthread_key_create(&opal_thread_self_key, NULL);
opal_atomic_mb();
opal_thread_self_key_init = true;
}
opal_atomic_unlock(&opal_thread_self_key_lock);
}
/* opal_thread_self_key has been already initialized. */
}
int opal_tsd_key_create(opal_tsd_key_t *key, opal_tsd_destructor_t destructor)
{
opal_threads_ensure_init_qthreads();
qthread_key_create(key, destructor);
return OPAL_SUCCESS;
}
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