Aquester
在线程中调用exit会有些什么？
分两种情况，一是在NPTL线程库，二是在老的linuxthread中调用exit，exit是否结束整个进程？还是象pthread_exit只退出当前线程？
void __pthread_exit(void * retval)
{
__pthread_do_exit (retval, CURRENT_STACK_FRAME);
}
strong_alias (__pthread_exit, pthread_exit);
void __pthread_do_exit(void *retval, char *currentframe)
{
pthread_descr self = thread_self();
pthread_descr joining;
struct pthread_request request;
/* Reset the cancellation flag to avoid looping if the cleanup handlers
contain cancellation points */
THREAD_SETMEM(self, p_canceled, 0);
/* Call cleanup functions and destroy the thread-specific data */
__pthread_perform_cleanup(currentframe);
__pthread_destroy_specifics();
/* Store return value */
__pthread_lock(THREAD_GETMEM(self, p_lock), self);
THREAD_SETMEM(self, p_retval, retval);
/* See whether we have to signal the death. */
if (THREAD_GETMEM(self, p_report_events))
{
/* See whether TD_DEATH is in any of the mask. */
int idx = __td_eventword (TD_DEATH);
uint32_t mask = __td_eventmask (TD_DEATH);
if ((mask & (__pthread_threads_events.event_bits[idx]
| THREAD_GETMEM_NC(self,
p_eventbuf.eventmask.event_bits[idx])))
!= 0)
{
/* Yep, we have to signal the death. */
THREAD_SETMEM(self, p_eventbuf.eventnum, TD_DEATH);
THREAD_SETMEM(self, p_eventbuf.eventdata, self);
__pthread_last_event = self;
/* Now call the function to signal the event. */
__linuxthreads_death_event();
}
}
/* Say that we've terminated */
THREAD_SETMEM(self, p_terminated, 1);
/* See if someone is joining on us */
joining = THREAD_GETMEM(self, p_joining);
__pthread_unlock(THREAD_GETMEM(self, p_lock));
/* Restart joining thread if any */
if (joining != NULL) restart(joining);
/* If this is the initial thread, block until all threads have terminated.
If another thread calls exit, we'll be terminated from our signal
handler. */
if (self == __pthread_main_thread && __pthread_manager_request >= 0) {
request.req_thread = self;
request.req_kind = REQ_MAIN_THREAD_EXIT;
TEMP_FAILURE_RETRY(write_not_cancel(__pthread_manager_request,
(char *)&request, sizeof(request)));
suspend(self);
/* Main thread flushes stdio streams and runs atexit functions.
It also calls a handler within LinuxThreads which sends a process exit
request to the thread manager. */
exit(0);
}
/* Threads other than the main one terminate without flushing stdio streams
or running atexit functions. */
_exit(0);
}