posix: Use a dedicated lock for scheduler changes

Update #2555.

2 files changed, 20 insertions, 0 deletions

diff --git a/cpukit/posix/include/rtems/posix/pthreadimpl.h b/cpukit/posix/include/rtems/posix/pthreadimpl.h
index 42f10b08bc..ef5821e48f 100644
--- a/cpukit/posix/include/rtems/posix/pthreadimpl.h
+++ b/cpukit/posix/include/rtems/posix/pthreadimpl.h
@@ -223,6 +223,23 @@ RTEMS_INLINE_ROUTINE Thread_Control *_POSIX_Threads_Join_dequeue(
   );
 }
 
+RTEMS_INLINE_ROUTINE void _POSIX_Threads_Scheduler_acquire(
+  POSIX_API_Control *api,
+  ISR_lock_Context  *lock_context
+)
+{
+  _ISR_lock_ISR_disable_and_acquire( &api->Scheduler_lock, lock_context );
+}
+
+RTEMS_INLINE_ROUTINE void _POSIX_Threads_Scheduler_release(
+  POSIX_API_Control *api,
+  ISR_lock_Context  *lock_context
+)
+{
+  _ISR_lock_Release_and_ISR_enable( &api->Scheduler_lock, lock_context );
+}
+
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/cpukit/posix/include/rtems/posix/threadsup.h b/cpukit/posix/include/rtems/posix/threadsup.h
index 7cd235409c..93ba2c1c7c 100644
--- a/cpukit/posix/include/rtems/posix/threadsup.h
+++ b/cpukit/posix/include/rtems/posix/threadsup.h
@@ -19,6 +19,7 @@
 #define _RTEMS_POSIX_THREADSUP_H
 
 #include <rtems/score/coresem.h>
+#include <rtems/score/isrlock.h>
 #include <rtems/score/thread.h>
 #include <rtems/score/threadq.h>
 #include <rtems/score/watchdog.h>
@@ -51,6 +52,8 @@ typedef struct {
   /** This is the set of threads waiting for the thread to exit. */
   Thread_queue_Control    Join_List;
   /** This is the thread's current scheduling policy. */
+  ISR_LOCK_MEMBER(        Scheduler_lock )
+  /** This is the thread's current scheduling policy. */
   int                     schedpolicy;
   /** This is the thread's current set of scheduling parameters. */
   struct sched_param      schedparam;