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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1999-05-17 23:03:07 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1999-05-17 23:03:07 +0000 |
commit | 5f9b3db545887fd328d006e33f1dca295584bc6f (patch) | |
tree | 59757f3f5ba22cca792f054ca09f9fbfdd697cc6 /cpukit/rtems/src/ratemonperiod.c | |
parent | Split the Semaphore Manager into one routine per file. (diff) | |
download | rtems-5f9b3db545887fd328d006e33f1dca295584bc6f.tar.bz2 |
Split Rate Monotonic Manager into one routine per file.
Diffstat (limited to 'cpukit/rtems/src/ratemonperiod.c')
-rw-r--r-- | cpukit/rtems/src/ratemonperiod.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/cpukit/rtems/src/ratemonperiod.c b/cpukit/rtems/src/ratemonperiod.c new file mode 100644 index 0000000000..95a09c453e --- /dev/null +++ b/cpukit/rtems/src/ratemonperiod.c @@ -0,0 +1,159 @@ +/* + * Rate Monotonic Manager + * + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * 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. + * + * $Id$ + */ + +#include <rtems/system.h> +#include <rtems/rtems/status.h> +#include <rtems/rtems/support.h> +#include <rtems/score/isr.h> +#include <rtems/score/object.h> +#include <rtems/rtems/ratemon.h> +#include <rtems/score/thread.h> + +/*PAGE + * + * rtems_rate_monotonic_period + * + * This directive allows a thread to manipulate a rate monotonic timer. + * + * Input parameters: + * id - rate monotonic id + * length - length of period (in ticks) + * + * Output parameters: + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_rate_monotonic_period( + Objects_Id id, + rtems_interval length +) +{ + Rate_monotonic_Control *the_period; + Objects_Locations location; + rtems_status_code return_value; + rtems_rate_monotonic_period_states local_state; + ISR_Level level; + + the_period = _Rate_monotonic_Get( id, &location ); + switch ( location ) { + case OBJECTS_REMOTE: /* should never return this */ + return RTEMS_INTERNAL_ERROR; + + case OBJECTS_ERROR: + return RTEMS_INVALID_ID; + + case OBJECTS_LOCAL: + if ( !_Thread_Is_executing( the_period->owner ) ) { + _Thread_Enable_dispatch(); + return RTEMS_NOT_OWNER_OF_RESOURCE; + } + + if ( length == RTEMS_PERIOD_STATUS ) { + switch ( the_period->state ) { + case RATE_MONOTONIC_INACTIVE: + return_value = RTEMS_NOT_DEFINED; + break; + case RATE_MONOTONIC_ACTIVE: + return_value = RTEMS_SUCCESSFUL; + break; + case RATE_MONOTONIC_EXPIRED: + return_value = RTEMS_TIMEOUT; + break; + default: /* unreached -- only to remove warnings */ + return_value = RTEMS_INTERNAL_ERROR; + break; + } + _Thread_Enable_dispatch(); + return( return_value ); + } + + _ISR_Disable( level ); + switch ( the_period->state ) { + case RATE_MONOTONIC_INACTIVE: + _ISR_Enable( level ); + the_period->state = RATE_MONOTONIC_ACTIVE; + _Watchdog_Initialize( + &the_period->Timer, + _Rate_monotonic_Timeout, + id, + NULL + ); + + the_period->owner_ticks_executed_at_period = + _Thread_Executing->ticks_executed; + + the_period->time_at_period = _Watchdog_Ticks_since_boot; + + _Watchdog_Insert_ticks( &the_period->Timer, length ); + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; + + case RATE_MONOTONIC_ACTIVE: + /* + * This tells the _Rate_monotonic_Timeout that this task is + * in the process of blocking on the period. + */ + + the_period->state = RATE_MONOTONIC_OWNER_IS_BLOCKING; + _ISR_Enable( level ); + + _Thread_Executing->Wait.id = the_period->Object.id; + _Thread_Set_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD ); + + /* + * Did the watchdog timer expire while we were actually blocking + * on it? + */ + + _ISR_Disable( level ); + local_state = the_period->state; + the_period->state = RATE_MONOTONIC_ACTIVE; + _ISR_Enable( level ); + + /* + * If it did, then we want to unblock ourself and continue as + * if nothing happen. The period was reset in the timeout routine. + */ + + if ( local_state == RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING ) + _Thread_Clear_state( _Thread_Executing, STATES_WAITING_FOR_PERIOD ); + + _Thread_Enable_dispatch(); + return RTEMS_SUCCESSFUL; + break; + + case RATE_MONOTONIC_EXPIRED: + _ISR_Enable( level ); + the_period->state = RATE_MONOTONIC_ACTIVE; + the_period->owner_ticks_executed_at_period = + _Thread_Executing->ticks_executed; + the_period->time_at_period = _Watchdog_Ticks_since_boot; + + _Watchdog_Insert_ticks( &the_period->Timer, length ); + _Thread_Enable_dispatch(); + return RTEMS_TIMEOUT; + + case RATE_MONOTONIC_OWNER_IS_BLOCKING: + case RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING: + /* + * These should never happen. + */ + break; + } + } + + return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ +} |