RTOS/rtems
1
0
Fork 0
forked from Imagelibrary/rtems
Code Pull Requests Activity

comment added to describe synchronization logic in timeout routine

Browse Source
This commit is contained in:
Joel Sherrill
1996-02-13 15:37:33 +00:00
parent a31ddf784b
commit 18269cef34
2 changed files with 42 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
c/src/exec/rtems/src/event.c
View File

@@ -198,14 +198,22 @@ void _Event_Seize(
switch ( sync_state ) {
case EVENT_SYNC_SYNCHRONIZED:
/*
* This cannot happen. It indicates that this routine did not
* enter the synchronization states above.
*/
return;
case EVENT_SYNC_NOTHING_HAPPENED:
_ISR_Enable( level );
return;
case EVENT_SYNC_TIMEOUT:
executing->Wait.return_code = RTEMS_TIMEOUT;
_ISR_Enable( level );
_Thread_Unblock( executing );
return;
case EVENT_SYNC_SATISFIED:
if ( _Watchdog_Is_active( &executing->Timer ) ) {
_Watchdog_Deactivate( &executing->Timer );
@@ -328,6 +336,19 @@ void _Event_Timeout(
case OBJECTS_REMOTE: /* impossible */
break;
case OBJECTS_LOCAL:
/*
* If the event manager is not synchronized, then it is either
* "nothing happened", "timeout", or "satisfied". If the_thread
* is the executing thread, then it is in the process of blocking
* and it is the thread which is responsible for the synchronization
* process.
*
* If it is not satisfied, then it is "nothing happened" and
* this is the "timeout" transition. After a request is satisfied,
* a timeout is not allowed to occur.
*/
if ( _Event_Sync_state != EVENT_SYNC_SYNCHRONIZED &&
_Thread_Is_executing( the_thread ) ) {
if ( _Event_Sync_state != EVENT_SYNC_SATISFIED )

21
cpukit/rtems/src/event.c
View File

@@ -198,14 +198,22 @@ void _Event_Seize(
switch ( sync_state ) {
case EVENT_SYNC_SYNCHRONIZED:
/*
* This cannot happen. It indicates that this routine did not
* enter the synchronization states above.
*/
return;
case EVENT_SYNC_NOTHING_HAPPENED:
_ISR_Enable( level );
return;
case EVENT_SYNC_TIMEOUT:
executing->Wait.return_code = RTEMS_TIMEOUT;
_ISR_Enable( level );
_Thread_Unblock( executing );
return;
case EVENT_SYNC_SATISFIED:
if ( _Watchdog_Is_active( &executing->Timer ) ) {
_Watchdog_Deactivate( &executing->Timer );
@@ -328,6 +336,19 @@ void _Event_Timeout(
case OBJECTS_REMOTE: /* impossible */
break;
case OBJECTS_LOCAL:
/*
* If the event manager is not synchronized, then it is either
* "nothing happened", "timeout", or "satisfied". If the_thread
* is the executing thread, then it is in the process of blocking
* and it is the thread which is responsible for the synchronization
* process.
*
* If it is not satisfied, then it is "nothing happened" and
* this is the "timeout" transition. After a request is satisfied,
* a timeout is not allowed to occur.
*/
if ( _Event_Sync_state != EVENT_SYNC_SYNCHRONIZED &&
_Thread_Is_executing( the_thread ) ) {
if ( _Event_Sync_state != EVENT_SYNC_SATISFIED )