__pthread_manager(void *arg)
{
pthread_descr self = manager_thread = arg;
int reqfd = __pthread_manager_reader;
struct pollfd ufd;
sigset_t manager_mask;
int n;
struct pthread_request request;
/* If we have special thread_self processing, initialize it. */
#ifdef INIT_THREAD_SELF
INIT_THREAD_SELF(self, 1);
#endif
#if !(USE_TLS && HAVE___THREAD)
/* Set the error variable. */
self->p_errnop = &self->p_errno;
self->p_h_errnop = &self->p_h_errno;
#endif
/* Block all signals except __pthread_sig_cancel and SIGTRAP */
sigfillset(&manager_mask);
sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */
sigdelset(&manager_mask, SIGTRAP); /* for debugging purposes */
if (__pthread_threads_debug && __pthread_sig_debug > 0)
sigdelset(&manager_mask, __pthread_sig_debug);
sigprocmask(SIG_SETMASK, &manager_mask, NULL);
/* Raise our priority to match that of main thread */
__pthread_manager_adjust_prio(__pthread_main_thread->p_priority);
/* Synchronize debugging of the thread manager */
n = TEMP_FAILURE_RETRY(read_not_cancel(reqfd, (char *)&request,
sizeof(request)));
ASSERT(n == sizeof(request) && request.req_kind == REQ_DEBUG);
ufd.fd = reqfd;
ufd.events = POLLIN;
/* Enter server loop */
while(1) {
n = __poll(&ufd, 1, 2000);
/* Check for termination of the main thread */
if (getppid() == 1) {
pthread_kill_all_threads(SIGKILL, 0);
_exit(0);
}
/* Check for dead children */
if (terminated_children) {
terminated_children = 0;
pthread_reap_children();
}
/* Read and execute request */
if (n == 1 && (ufd.revents & POLLIN)) {
n = TEMP_FAILURE_RETRY(read_not_cancel(reqfd, (char *)&request,
sizeof(request)));
#ifdef DEBUG
if (n < 0) {
char d[64];
write(STDERR_FILENO, d, snprintf(d, sizeof(d), "*** read err %m\n"));
} else if (n != sizeof(request)) {
write(STDERR_FILENO, "*** short read in manager\n", 26);
}
#endif
switch(request.req_kind) {
case REQ_CREATE:
request.req_thread->p_retcode =
pthread_handle_create((pthread_t *) &request.req_thread->p_retval,
request.req_args.create.attr,
request.req_args.create.fn,
request.req_args.create.arg,
&request.req_args.create.mask,
request.req_thread->p_pid,
request.req_thread->p_report_events,
&request.req_thread->p_eventbuf.eventmask);
restart(request.req_thread);
break;
case REQ_FREE:
pthread_handle_free(request.req_args.free.thread_id);
break;
case REQ_PROCESS_EXIT:
pthread_handle_exit(request.req_thread,
request.req_args.exit.code);
/* NOTREACHED */
break;
case REQ_MAIN_THREAD_EXIT:
main_thread_exiting = 1;
/* Reap children in case all other threads died and the signal handler
went off before we set main_thread_exiting to 1, and therefore did
not do REQ_KICK. */
pthread_reap_children();
if (__pthread_main_thread->p_nextlive == __pthread_main_thread) {
restart(__pthread_main_thread);
/* The main thread will now call exit() which will trigger an
__on_exit handler, which in turn will send REQ_PROCESS_EXIT
to the thread manager. In case you are wondering how the
manager terminates from its loop here. */
}
break;
case REQ_POST:
sem_post(request.req_args.post);
break;
case REQ_DEBUG:
/* Make gdb aware of new thread and gdb will restart the
new thread when it is ready to handle the new thread. */
if (__pthread_threads_debug && __pthread_sig_debug > 0)
raise(__pthread_sig_debug);
break;
case REQ_KICK:
/* This is just a prod to get the manager to reap some
threads right away, avoiding a potential delay at shutdown. */
break;
case REQ_FOR_EACH_THREAD:
pthread_for_each_thread(request.req_args.for_each.arg,
request.req_args.for_each.fn);
restart(request.req_thread);
break;
}
}
}
}
int attribute_noreturn __pthread_manager(void *arg)
{
int reqfd = (int) (long int) arg;
#ifdef USE_SELECT
struct timeval tv;
fd_set fd;
#else
struct pollfd ufd;
#endif
sigset_t manager_mask;
int n;
struct pthread_request request;
/* If we have special thread_self processing, initialize it. */
#ifdef INIT_THREAD_SELF
INIT_THREAD_SELF(&__pthread_manager_thread, 1);
#endif
/* Set the error variable. */
__pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno;
__pthread_manager_thread.p_h_errnop = &__pthread_manager_thread.p_h_errno;
#ifdef __UCLIBC_HAS_XLOCALE__
/* Initialize thread's locale to the global locale. */
__pthread_manager_thread.locale = __global_locale;
#endif /* __UCLIBC_HAS_XLOCALE__ */
/* Block all signals except __pthread_sig_cancel and SIGTRAP */
__sigfillset(&manager_mask);
sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */
sigdelset(&manager_mask, SIGTRAP); /* for debugging purposes */
if (__pthread_threads_debug && __pthread_sig_debug > 0)
sigdelset(&manager_mask, __pthread_sig_debug);
sigprocmask(SIG_SETMASK, &manager_mask, NULL);
/* Raise our priority to match that of main thread */
__pthread_manager_adjust_prio(__pthread_main_thread->p_priority);
/* Synchronize debugging of the thread manager */
n = TEMP_FAILURE_RETRY(read(reqfd, (char *)&request,
sizeof(request)));
#ifndef USE_SELECT
ufd.fd = reqfd;
ufd.events = POLLIN;
#endif
/* Enter server loop */
while(1) {
#ifdef USE_SELECT
tv.tv_sec = 2;
tv.tv_usec = 0;
FD_ZERO (&fd);
FD_SET (reqfd, &fd);
n = select (reqfd + 1, &fd, NULL, NULL, &tv);
#else
PDEBUG("before poll\n");
n = poll(&ufd, 1, 2000);
PDEBUG("after poll\n");
#endif
/* Check for termination of the main thread */
if (getppid() == 1) {
pthread_kill_all_threads(SIGKILL, 0);
_exit(0);
}
/* Check for dead children */
if (terminated_children) {
terminated_children = 0;
pthread_reap_children();
}
/* Read and execute request */
#ifdef USE_SELECT
if (n == 1)
#else
if (n == 1 && (ufd.revents & POLLIN))
#endif
{
PDEBUG("before read\n");
n = read(reqfd, (char *)&request, sizeof(request));
PDEBUG("after read, n=%d\n", n);
switch(request.req_kind) {
case REQ_CREATE:
PDEBUG("got REQ_CREATE\n");
request.req_thread->p_retcode =
pthread_handle_create((pthread_t *) &request.req_thread->p_retval,
request.req_args.create.attr,
request.req_args.create.fn,
request.req_args.create.arg,
&request.req_args.create.mask,
request.req_thread->p_pid,
request.req_thread->p_report_events,
&request.req_thread->p_eventbuf.eventmask);
PDEBUG("restarting %p\n", request.req_thread);
restart(request.req_thread);
break;
case REQ_FREE:
PDEBUG("got REQ_FREE\n");
pthread_handle_free(request.req_args.free.thread_id);
break;
case REQ_PROCESS_EXIT:
PDEBUG("got REQ_PROCESS_EXIT from %p, exit code = %d\n",
request.req_thread, request.req_args.exit.code);
pthread_handle_exit(request.req_thread,
request.req_args.exit.code);
break;
case REQ_MAIN_THREAD_EXIT:
PDEBUG("got REQ_MAIN_THREAD_EXIT\n");
main_thread_exiting = 1;
/* Reap children in case all other threads died and the signal handler
went off before we set main_thread_exiting to 1, and therefore did
not do REQ_KICK. */
pthread_reap_children();
if (__pthread_main_thread->p_nextlive == __pthread_main_thread) {
restart(__pthread_main_thread);
/* The main thread will now call exit() which will trigger an
__on_exit handler, which in turn will send REQ_PROCESS_EXIT
to the thread manager. In case you are wondering how the
manager terminates from its loop here. */
}
break;
case REQ_POST:
PDEBUG("got REQ_POST\n");
sem_post(request.req_args.post);
break;
case REQ_DEBUG:
PDEBUG("got REQ_DEBUG\n");
/* Make gdb aware of new thread and gdb will restart the
new thread when it is ready to handle the new thread. */
if (__pthread_threads_debug && __pthread_sig_debug > 0) {
PDEBUG("about to call raise(__pthread_sig_debug)\n");
raise(__pthread_sig_debug);
}
case REQ_KICK:
/* This is just a prod to get the manager to reap some
threads right away, avoiding a potential delay at shutdown. */
break;
}
}
}
}
int __pthread_manager(void * arg)
{
int reqfd = (int) arg;
sigset_t mask;
fd_set readfds;
struct timeval timeout;
int n;
struct pthread_request request;
/* If we have special thread_self processing, initialize it. */
#ifdef INIT_THREAD_SELF
INIT_THREAD_SELF(&__pthread_manager_thread);
#endif
/* Block all signals except PTHREAD_SIG_RESTART */
sigfillset(&mask);
sigdelset(&mask, PTHREAD_SIG_RESTART);
sigprocmask(SIG_SETMASK, &mask, NULL);
/* Enter server loop */
while(1) {
FD_ZERO(&readfds);
FD_SET(reqfd, &readfds);
timeout.tv_sec = 2;
timeout.tv_usec = 0;
n = select(FD_SETSIZE, &readfds, NULL, NULL, &timeout);
/* Check for termination of the main thread */
if (getppid() == 1) {
pthread_kill_all_threads(SIGKILL, 0);
_exit(0);
}
/* Check for dead children */
if (terminated_children) {
terminated_children = 0;
pthread_reap_children();
}
/* Read and execute request */
if (n == 1 && FD_ISSET(reqfd, &readfds)) {
n = read(reqfd, (char *)&request, sizeof(request));
ASSERT(n == sizeof(request));
switch(request.req_kind) {
case REQ_CREATE:
request.req_thread->p_retcode =
pthread_handle_create((pthread_t *) &request.req_thread->p_retval,
request.req_args.create.attr,
request.req_args.create.fn,
request.req_args.create.arg,
&request.req_args.create.mask,
request.req_thread->p_pid);
restart(request.req_thread);
break;
case REQ_FREE:
pthread_handle_free(request.req_args.free.thread);
break;
case REQ_PROCESS_EXIT:
pthread_handle_exit(request.req_thread,
request.req_args.exit.code);
break;
case REQ_MAIN_THREAD_EXIT:
main_thread_exiting = 1;
if (__pthread_main_thread->p_nextlive == __pthread_main_thread) {
restart(__pthread_main_thread);
return 0;
}
break;
}
}
}
}
