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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [posix/] [src/] [alarm.c] - Rev 593
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/* * 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79 * * COPYRIGHT (c) 1989-1999. * 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: alarm.c,v 1.2 2001-09-27 11:59:17 chris Exp $ */ #include <pthread.h> #include <errno.h> #include <rtems/system.h> #include <rtems/posix/pthread.h> #include <rtems/posix/psignal.h> unsigned int alarm( unsigned int seconds ) { unsigned int remaining = 0; Watchdog_Control *the_timer; the_timer = &_POSIX_signals_Alarm_timer; 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. */ remaining = the_timer->initial - ((the_timer->stop_time - the_timer->start_time) / _TOD_Ticks_per_second); break; } _Watchdog_Insert_seconds( the_timer, seconds ); return remaining; }
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