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Diffstat (limited to 'cpukit/rtems/src/timerfireafter.c')
-rw-r--r-- | cpukit/rtems/src/timerfireafter.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/cpukit/rtems/src/timerfireafter.c b/cpukit/rtems/src/timerfireafter.c new file mode 100644 index 0000000000..540ede38ad --- /dev/null +++ b/cpukit/rtems/src/timerfireafter.c @@ -0,0 +1,103 @@ +/* + * Timer Manager - rtems_timer_fire_after directive + * + * + * 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 <rtems/system.h> +#include <rtems/rtems/status.h> +#include <rtems/rtems/support.h> +#include <rtems/score/object.h> +#include <rtems/score/thread.h> +#include <rtems/rtems/timer.h> +#include <rtems/score/tod.h> +#include <rtems/score/watchdog.h> + +/*PAGE + * + * rtems_timer_fire_after + * + * This directive allows a thread to start a timer. + * + * Input parameters: + * id - timer id + * ticks - interval until routine is fired + * routine - routine to schedule + * user_data - passed as argument to routine when it is fired + * + * Output parameters: + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_timer_fire_after( + rtems_id id, + rtems_interval ticks, + rtems_timer_service_routine_entry routine, + void *user_data +) +{ + Timer_Control *the_timer; + Objects_Locations location; + ISR_Level level; + + if ( ticks == 0 ) + return RTEMS_INVALID_NUMBER; + + if ( !routine ) + return RTEMS_INVALID_ADDRESS; + + the_timer = _Timer_Get( id, &location ); + switch ( location ) { + + case OBJECTS_LOCAL: + (void) _Watchdog_Remove( &the_timer->Ticker ); + + _ISR_Disable( level ); + + /* + * Check to see if the watchdog has just been inserted by a + * higher priority interrupt. If so, abandon this insert. + */ + + if ( the_timer->Ticker.state != WATCHDOG_INACTIVE ) { + _ISR_Enable( level ); + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; + } + + /* + * OK. Now we now the timer was not rescheduled by an interrupt + * so we can atomically initialize it as in use. + */ + + the_timer->the_class = TIMER_INTERVAL; + _Watchdog_Initialize( &the_timer->Ticker, routine, id, user_data ); + _ISR_Enable( level ); + + + _Watchdog_Insert_ticks( &the_timer->Ticker, ticks ); + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; + +#if defined(RTEMS_MULTIPROCESSING) + case OBJECTS_REMOTE: /* should never return this */ +#endif + case OBJECTS_ERROR: + break; + } + + return RTEMS_INVALID_ID; +} |