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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.
//
// 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 nni_plat_lock = PTHREAD_MUTEX_INITIALIZER;
static int nni_plat_inited = 0;
static int nni_plat_forked = 0;
static void *
nni_thrfunc(void *arg)
{
nni_thread *thr = arg;
thr->func(thr->arg);
return (NULL);
}
int
nni_thread_create(nni_thread **tp, void (*fn)(void *), void *arg)
{
nni_thread *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, nni_thrfunc, thr)) != 0) {
nni_free(thr, sizeof (*thr));
return (NNG_ENOMEM);
}
*tp = thr;
return (0);
}
void
nni_thread_reap(nni_thread * thr)
{
int rv;
if ((rv = pthread_join(thr->tid, NULL)) != 0) {
nni_panic("pthread_thread: %s", strerror(errno));
}
nni_free(thr, sizeof (*thr));
}
void
nni_atfork_child(void)
{
nni_plat_forked = 1;
}
pthread_condattr_t nni_condattr;
pthread_mutexattr_t nni_mutexattr;
int
nni_plat_init(int (*helper)(void))
{
int rv;
if (nni_plat_forked) {
nni_panic("nng is fork-reentrant safe");
}
if (nni_plat_inited) {
return (0); // fast path
}
pthread_mutex_lock(&nni_plat_lock);
if (nni_plat_inited) { // check again under the lock to be sure
pthread_mutex_unlock(&nni_plat_lock);
return (0);
}
if (pthread_condattr_init(&nni_condattr) != 0) {
pthread_mutex_unlock(&nni_plat_lock);
return (NNG_ENOMEM);
}
#if !defined(NNG_USE_GETTIMEOFDAY) && NNG_USE_CLOCKID != CLOCK_REALTIME
if (pthread_condattr_setclock(&nni_condattr, NNG_USE_CLOCKID) != 0) {
pthread_mutex_unlock(&nni_plat_lock);
return (NNG_ENOMEM);
}
#endif
if (pthread_mutexattr_init(&nni_mutexattr) != 0) {
pthread_mutex_unlock(&nni_plat_lock);
return (NNG_ENOMEM);
}
if (pthread_mutexattr_settype(&nni_mutexattr,
PTHREAD_MUTEX_ERRORCHECK) != 0) {
pthread_mutex_unlock(&nni_plat_lock);
return (NNG_ENOMEM);
}
if (pthread_atfork(NULL, NULL, nni_atfork_child) != 0) {
pthread_mutex_unlock(&nni_plat_lock);
return (NNG_ENOMEM);
}
if ((rv = helper()) == 0) {
nni_plat_inited = 1;
}
pthread_mutex_unlock(&nni_plat_lock);
return (rv);
}
void
nni_plat_fini(void)
{
pthread_mutex_lock(&nni_plat_lock);
if (nni_plat_inited) {
pthread_mutexattr_destroy(&nni_mutexattr);
pthread_condattr_destroy(&nni_condattr);
nni_plat_inited = 0;
}
pthread_mutex_unlock(&nni_plat_lock);
}
#endif
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