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authorJoel Sherrill <joel.sherrill@OARcorp.com>2003-08-14 13:08:58 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2003-08-14 13:08:58 +0000
commitb56c1a3ab7c3215b5ca7d3e2a2a5473c35e16529 (patch)
treed0a4873c62a6e1bc417eb2e671d53543a4d81262 /cpukit/posix/src/ualarm.c
parent41a530752cc7764eca8ff76cf83ef1e70b0371da (diff)
downloadrtems-b56c1a3ab7c3215b5ca7d3e2a2a5473c35e16529.tar.bz2
2003-08-14 Joel Sherrill <joel@OARcorp.com>
PR 92/rtems * Makefile.am, src/alarm.c, src/psignal.c: Added ualarm() and usleep(). * src/ualarm.c, src/usleep.c: New files.
Diffstat (limited to 'cpukit/posix/src/ualarm.c')
-rw-r--r--cpukit/posix/src/ualarm.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/cpukit/posix/src/ualarm.c b/cpukit/posix/src/ualarm.c
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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;
+}
+