1 files changed, 95 insertions, 0 deletions
diff --git a/cpukit/posix/src/ualarm.c b/cpukit/posix/src/ualarm.c
new file mode 100644
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+++ b/cpukit/posix/src/ualarm.c
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+/*
+ *  XXX 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79
+ *
+ *  COPYRIGHT (c) 1989-2003.
+ *  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.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <pthread.h>
+/* #include <errno.h> */
+
+#include <rtems/system.h>
+#include <rtems/posix/pthread.h>
+#include <rtems/posix/psignal.h>
+#include <rtems/posix/time.h>
+
+Watchdog_Control _POSIX_signals_Ualarm_timer;
+
+/*PAGE
+ *
+ *  _POSIX_signals_Ualarm_TSR
+ */
+ 
+void _POSIX_signals_Ualarm_TSR(
+  Objects_Id      id,
+  void           *argument
+)
+{
+  int status;
+
+  status = kill( getpid(), SIGALRM );
+  /* XXX can't print from an ISR, should this be fatal? */
+}
+
+useconds_t ualarm(
+  useconds_t useconds,
+  useconds_t interval
+)
+{
+  useconds_t        remaining = 0;
+  Watchdog_Control *the_timer;
+  Watchdog_Interval ticks;
+  struct timespec   tp;
+
+  the_timer = &_POSIX_signals_Ualarm_timer;
+
+  /*
+   *  Initialize the timer used to implement alarm().
+   */
+
+  if ( !the_timer->routine ) {
+    _Watchdog_Initialize( the_timer, _POSIX_signals_Ualarm_TSR, 0, NULL );
+  } else {
+    switch ( _Watchdog_Remove( the_timer ) ) {
+      case WATCHDOG_INACTIVE:
+      case WATCHDOG_BEING_INSERTED:
+        break;
+
+      case WATCHDOG_ACTIVE:
+      case WATCHDOG_REMOVE_IT:
+        /*
+         *  The stop_time and start_time fields are snapshots of ticks since
+         *  boot.  Since alarm() is dealing in seconds, we must account for
+         *  this.
+         */
+
+	
+        ticks = the_timer->initial -
+         ((the_timer->stop_time - the_timer->start_time) /
+	   _TOD_Ticks_per_second);
+
+        _POSIX_Interval_to_timespec( ticks, &tp );
+        remaining  = tp.tv_sec * TOD_MICROSECONDS_PER_SECOND;
+        remaining += tp.tv_nsec / 1000;
+        break;
+    }
+  }
+
+  tp.tv_sec = useconds / TOD_MICROSECONDS_PER_SECOND;
+  tp.tv_nsec = (useconds % TOD_MICROSECONDS_PER_SECOND) * 1000;
+  ticks = _POSIX_Timespec_to_interval( &tp );
+  _Watchdog_Insert_ticks( the_timer, ticks );
+
+  return remaining;
+}
+