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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
static void *nxt_thread_trampoline(void *data);
static void nxt_thread_time_cleanup(void *data);
#if (NXT_HAVE_PTHREAD_SPECIFIC_DATA)
static void nxt_thread_key_dtor(void *data);
void
nxt_thread_init_data(nxt_thread_specific_data_t tsd)
{
void *p;
nxt_err_t err;
pthread_key_t key;
while ((nxt_atomic_int_t) tsd->key < 0) {
/*
* Atomic allocation of a key number.
* -1 means an uninitialized key,
* -2 is the initializing lock to assure the single value for the key.
*/
if (nxt_atomic_cmp_set(&tsd->key, -1, -2)) {
err = pthread_key_create(&key, nxt_thread_key_dtor);
if (err != 0) {
nxt_main_log_emerg("pthread_key_create() failed %E", err);
goto fail;
}
tsd->key = (nxt_atomic_t) key;
nxt_main_log_debug("pthread_key_create(): %A", tsd->key);
}
}
if (pthread_getspecific((pthread_key_t) tsd->key) != NULL) {
return;
}
p = nxt_zalloc(tsd->size);
if (p == NULL) {
goto fail;
}
err = pthread_setspecific((pthread_key_t) tsd->key, p);
if (err == 0) {
return;
}
nxt_main_log_alert("pthread_setspecific(%A) failed %E", tsd->key, err);
fail:
pthread_exit(NULL);
nxt_unreachable();
}
static void
nxt_thread_key_dtor(void *data)
{
nxt_main_log_debug("pthread key dtor: %p", data);
nxt_free(data);
}
#endif
nxt_int_t
nxt_thread_create(nxt_thread_handle_t *handle, nxt_thread_link_t *link)
{
nxt_err_t err;
err = pthread_create(handle, NULL, nxt_thread_trampoline, link);
if (nxt_fast_path(err == 0)) {
nxt_thread_log_debug("pthread_create(): %PH", *handle);
return NXT_OK;
}
nxt_thread_log_alert("pthread_create() failed %E", err);
nxt_free(link);
return NXT_ERROR;
}
static void *
nxt_thread_trampoline(void *data)
{
nxt_thread_t *thr;
nxt_thread_link_t *link;
nxt_thread_start_t start;
link = data;
thr = nxt_thread_init();
nxt_log_debug(thr->log, "thread trampoline: %PH", thr->handle);
pthread_cleanup_push(nxt_thread_time_cleanup, thr);
start = link->start;
data = link->work.data;
if (link->work.handler != NULL) {
thr->link = link;
} else {
nxt_free(link);
}
start(data);
/*
* nxt_thread_time_cleanup() should be called only if a thread
* would be canceled, so ignore it here because nxt_thread_exit()
* calls nxt_thread_time_free() as well.
*/
pthread_cleanup_pop(0);
nxt_thread_exit(thr);
nxt_unreachable();
return NULL;
}
nxt_thread_t *
nxt_thread_init(void)
{
nxt_thread_t *thr;
nxt_thread_init_data(nxt_thread_context);
thr = nxt_thread();
if (thr->log == NULL) {
thr->log = &nxt_main_log;
thr->handle = nxt_thread_handle();
/*
* Threads are never preempted by asynchronous signals, since
* the signals are processed synchronously by dedicated thread.
*/
thr->time.signal = -1;
nxt_thread_time_update(thr);
}
nxt_random_init(&thr->random);
return thr;
}
static void
nxt_thread_time_cleanup(void *data)
{
nxt_thread_t *thr;
thr = data;
nxt_log_debug(thr->log, "thread time cleanup");
nxt_thread_time_free(thr);
}
void
nxt_thread_exit(nxt_thread_t *thr)
{
nxt_thread_link_t *link;
nxt_event_engine_t *engine;
nxt_log_debug(thr->log, "thread exit");
link = thr->link;
thr->link = NULL;
if (link != NULL) {
/*
* link->work.handler is already set to an exit handler,
* and link->work.task is already set to the correct engine->task.
* The link should be freed by the exit handler.
*/
link->work.obj = (void *) (uintptr_t) thr->handle;
engine = nxt_container_of(link->work.task, nxt_event_engine_t, task);
nxt_event_engine_post(engine, &link->work);
}
nxt_thread_time_free(thr);
pthread_exit(NULL);
nxt_unreachable();
}
void
nxt_thread_cancel(nxt_thread_handle_t handle)
{
nxt_err_t err;
nxt_thread_log_debug("thread cancel: %PH", handle);
err = pthread_cancel(handle);
if (err != 0) {
nxt_main_log_alert("pthread_cancel(%PH) failed %E", handle, err);
}
}
void
nxt_thread_wait(nxt_thread_handle_t handle)
{
nxt_err_t err;
nxt_thread_log_debug("thread wait: %PH", handle);
err = pthread_join(handle, NULL);
if (err != 0) {
nxt_main_log_alert("pthread_join(%PH) failed %E", handle, err);
}
}
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