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Diffstat (limited to 'testsuites/sptests/sp36/sp36.doc')
| -rw-r--r-- | testsuites/sptests/sp36/sp36.doc | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/testsuites/sptests/sp36/sp36.doc b/testsuites/sptests/sp36/sp36.doc deleted file mode 100644 index d67943b93a..0000000000 --- a/testsuites/sptests/sp36/sp36.doc +++ /dev/null @@ -1,42 +0,0 @@ -This is a simple test program to demonstrate strict order mutex. - -1)What's strict order mutex ? - - In rtems,when a task release a priority_inheritance or - priority ceiling semaphore,the kernel detect whether - this task holds priority_inheritance or priority - ceiling semaphore, if not, set the priority of task - back to real priority of task. - This method is right, but in theory, we would like - to reset the priority after releasing the mutex if - releasing it in LIFO order.Do it like this can decrease - the blocking time of a higher priority task . - -2)How to enable "strict order mutex " ? - - When configuring the rtems , add - ENABLE_STRICT_ORDER_MUTEX=1 - to your configure parameter. - - -3)About this test program - - T0,T1,S0,S1 - - T0,priority 4 - T1,priority 1 - - S0,priority inheritance - S1,priority ceiling,priority ceiling 1 - - 1,T0 obtain S0 then obtain S1, priority of T0 should be improved to 1 - 2,T0 try to release S0, but not in strict order, return error code - 3,T0 release S1,the priority of T0 back to 4 - 4,T1 try to obtain S0 - 5,T1 should be blocked and the priority of T0 should be improved to 1 - 6,T0 release S0 - 7,T1 obtain S0 - 8,OVER. - - - |