[rtems commit] score: Relax Giant lock usage for API mutexes

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    fb7199d3a27036e2de408caef1a8c755dc986050
Changeset: http://git.rtems.org/rtems/commit/?id=fb7199d3a27036e2de408caef1a8c755dc986050

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Thu Mar 13 15:25:06 2014 +0100

score: Relax Giant lock usage for API mutexes

It is no longer necessary to protect the workspace allocations with the
Giant lock due to the thread life cycle re-implementation.

---

 cpukit/posix/src/pthread.c        |    2 +-
 cpukit/score/src/apimutexlock.c   |    4 ++++
 cpukit/score/src/apimutexunlock.c |    5 +----
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/cpukit/posix/src/pthread.c b/cpukit/posix/src/pthread.c
index 8d1a8eb..512cd70 100644
--- a/cpukit/posix/src/pthread.c
+++ b/cpukit/posix/src/pthread.c
@@ -227,7 +227,7 @@ static bool _POSIX_Threads_Create_extension(
          && _Objects_Get_class( created->Object.id ) == 1
        #endif
   ) {
-    executing_api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];
+    executing_api = _Thread_Get_executing()->API_Extensions[ THREAD_API_POSIX ];
     api->signals_blocked = executing_api->signals_blocked;
   } else {
     api->signals_blocked = SIGNAL_ALL_MASK;
diff --git a/cpukit/score/src/apimutexlock.c b/cpukit/score/src/apimutexlock.c
index 91f6af3..d943bdd 100644
--- a/cpukit/score/src/apimutexlock.c
+++ b/cpukit/score/src/apimutexlock.c
@@ -43,4 +43,8 @@ void _API_Mutex_Lock(
     0,
     level
   );
+
+  #if defined(RTEMS_SMP)
+    _Thread_Enable_dispatch();
+  #endif
 }
diff --git a/cpukit/score/src/apimutexunlock.c b/cpukit/score/src/apimutexunlock.c
index 354033c..43bdfe8 100644
--- a/cpukit/score/src/apimutexunlock.c
+++ b/cpukit/score/src/apimutexunlock.c
@@ -27,10 +27,7 @@ void _API_Mutex_Unlock(
   API_Mutex_Control *the_mutex
 )
 {
-   /* Dispatch is already disabled in SMP while lock is held. */
-   #if !defined(RTEMS_SMP)
-     _Thread_Disable_dispatch();
-   #endif
+   _Thread_Disable_dispatch();
     _CORE_mutex_Surrender(
       &the_mutex->Mutex,
       the_mutex->Object.id,