1 files changed, 120 insertions, 0 deletions
diff --git a/cpukit/posix/src/psignalunblockthread.c b/cpukit/posix/src/psignalunblockthread.c
new file mode 100644
index 0000000000..f6bf5fcc7d
--- /dev/null
+++ b/cpukit/posix/src/psignalunblockthread.c
@@ -0,0 +1,120 @@
+/*
+ *  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;
+}