[rtems commit] posix: fix race condition between pthread_create and capture engine

[Gedare Bloom]

Module:    rtems
Branch:    master
Commit:    a19a7077ee82a0189a45105df56029abd7804bd6
Changeset: http://git.rtems.org/rtems/commit/?id=a19a7077ee82a0189a45105df56029abd7804bd6

Author:    Till Strauman <strauman at slac.stanford.edu>
Date:      Tue Dec 17 18:01:11 2013 -0600

posix: fix race condition between pthread_create and capture engine

Reproducable crashes occur when using pthreads and the capture engine
at the same time. 'pthread_create()' is the culprit. It creates a SCORE thread
and then calls Thread_Start( ) without disabling thread-dispatching.

---

 cpukit/posix/src/pthreadcreate.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/cpukit/posix/src/pthreadcreate.c b/cpukit/posix/src/pthreadcreate.c
index 64270e9..b780ecc 100644
--- a/cpukit/posix/src/pthreadcreate.c
+++ b/cpukit/posix/src/pthreadcreate.c
@@ -196,6 +196,8 @@ int pthread_create(
   api->schedpolicy = schedpolicy;
   api->schedparam  = schedparam;
 
+  _Thread_Disable_dispatch();
+
   /*
    *  POSIX threads are allocated and started in one operation.
    */
@@ -216,6 +218,7 @@ int pthread_create(
      *        thread while we are creating it.
      */
     if ( !status ) {
+      _Thread_Enable_dispatch();
       _POSIX_Threads_Free( the_thread );
       _RTEMS_Unlock_allocator();
       return EINVAL;
@@ -229,6 +232,8 @@ int pthread_create(
     );
   }
 
+  _Thread_Enable_dispatch();
+
   /*
    *  Return the id and indicate we successfully created the thread
    */