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/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/tqdata.h>
#include <rtems/score/wkspace.h>
#include <rtems/seterr.h>
#include <rtems/posix/threadsup.h>
#include <rtems/posix/psignal.h>
#include <rtems/posix/pthread.h>
#include <rtems/posix/time.h>
#include <stdio.h>
/*PAGE
*
* _POSIX_signals_Unblock_thread
*/
/* XXX this routine could probably be cleaned up */
bool _POSIX_signals_Unblock_thread(
Thread_Control *the_thread,
int signo,
siginfo_t *info
)
{
POSIX_API_Control *api;
sigset_t mask;
siginfo_t *the_info = NULL;
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
mask = signo_to_mask( signo );
/*
* Is the thread is specifically waiting for a signal?
*/
if ( _States_Is_interruptible_signal( the_thread->current_state ) ) {
if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) {
the_thread->Wait.return_code = EINTR;
the_info = (siginfo_t *) the_thread->Wait.return_argument;
if ( !info ) {
the_info->si_signo = signo;
the_info->si_code = SI_USER;
the_info->si_value.sival_int = 0;
} else {
*the_info = *info;
}
_Thread_queue_Extract_with_proxy( the_thread );
return true;
}
/*
* This should only be reached via pthread_kill().
*/
return false;
}
/*
* Thread is not waiting due to a sigwait.
*/
if ( ~api->signals_blocked & mask ) {
/*
* The thread is interested in this signal. We are going
* to post it. We have a few broad cases:
* + If it is blocked on an interruptible signal, THEN
* we unblock the thread.
* + If it is in the ready state AND
* we are sending from an ISR AND
* it is the interrupted thread AND
* it is not blocked, THEN
* we need to dispatch at the end of this ISR.
* + Any other combination, do nothing.
*/
if ( _States_Is_interruptible_by_signal( the_thread->current_state ) ) {
the_thread->Wait.return_code = EINTR;
/*
* In pthread_cond_wait, a thread will be blocking on a thread
* queue, but is also interruptible by a POSIX signal.
*/
if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) )
_Thread_queue_Extract_with_proxy( the_thread );
else if ( _States_Is_delaying(the_thread->current_state) ) {
(void) _Watchdog_Remove( &the_thread->Timer );
_Thread_Unblock( the_thread );
}
} else if ( the_thread->current_state == STATES_READY ) {
if ( _ISR_Is_in_progress() && _Thread_Is_executing( the_thread ) )
_Thread_Dispatch_necessary = true;
}
}
return false;
}
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