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/*
* Copyright 2016 Garrett D'Amore <garrett@damore.org>
*
* This software is supplied under the terms of the MIT License, a
* copy of which should be located in the distribution where this
* file was obtained (LICENSE.txt). A copy of the license may also be
* found online at https://opensource.org/licenses/MIT.
*/
/*
* This is more of a direct #include of a .c rather than .h file.
* But having it be a .h makes compiler rules work out properly. Do
* not include this more than once into your program, or you will
* get multiple symbols defined.
*/
/*
* POSIX threads.
*/
#include "core/nng_impl.h"
#ifdef PLATFORM_POSIX_THREAD
#include <pthread.h>
#include <time.h>
#include <string.h>
struct nni_thread {
pthread_t tid;
void * arg;
void (*func)(void *);
};
static pthread_mutex_t plat_lock = PTHREAD_MUTEX_INITIALIZER;
static int plat_init = 0;
static int plat_fork = 0;
static void *
thrfunc(void *arg)
{
nni_thread_t thr = arg;
thr->func(thr->arg);
return (NULL);
}
int
nni_thread_create(nni_thread_t *tp, void (*fn)(void *), void *arg)
{
nni_thread_t thr;
int rv;
if ((thr = nni_alloc(sizeof (*thr))) == NULL) {
return (NNG_ENOMEM);
}
thr->func = fn;
thr->arg = arg;
if ((rv = pthread_create(&thr->tid, NULL, thrfunc, thr)) != 0) {
nni_free(thr, sizeof (*thr));
return (NNG_ENOMEM);
}
*tp = thr;
return (0);
}
void
nni_thread_reap(nni_thread_t thr)
{
int rv;
if ((rv = pthread_join(thr->tid, NULL)) != 0) {
nni_panic("pthread_thread: %s", strerror(errno));
}
nni_free(thr, sizeof (*thr));
}
void
atfork_child(void)
{
plat_fork = 1;
}
int
nni_plat_init(int (*helper)(void))
{
int rv;
if (plat_fork) {
nni_panic("nng is fork-reentrant safe");
}
if (plat_init) {
return (0); /* fast path */
}
pthread_mutex_lock(&plat_lock);
if (plat_init) { /* check again under the lock to be sure */
pthread_mutex_unlock(&plat_lock);
return (0);
}
if (pthread_atfork(NULL, NULL, atfork_child) != 0) {
pthread_mutex_unlock(&plat_lock);
return (NNG_ENOMEM);
}
if ((rv = helper()) == 0) {
plat_init = 1;
}
pthread_mutex_unlock(&plat_lock);
return (rv);
}
void
nni_plat_fini(void)
{
/* XXX: NOTHING *YET* */
}
#endif
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