From f5d4570fe699f9930a23199ca0e9f45b5fa4a219 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Sat, 11 Jul 2015 21:14:46 +0200
Subject: score: Simplify _Thread_Lock_set()

Exploit the fact that the current thread lock must be the default thread
lock and interrupts are disabled if we call _Thread_Lock_set().
---
 cpukit/score/include/rtems/score/threadimpl.h | 67 ++++++++++++++++++++++-----
 1 file changed, 56 insertions(+), 11 deletions(-)

diff --git a/cpukit/score/include/rtems/score/threadimpl.h b/cpukit/score/include/rtems/score/threadimpl.h
index ffff220288..0dfdb8a263 100644
--- a/cpukit/score/include/rtems/score/threadimpl.h
+++ b/cpukit/score/include/rtems/score/threadimpl.h
@@ -1009,22 +1009,25 @@ RTEMS_INLINE_ROUTINE void _Thread_Lock_acquire_default(
 }
 
 /**
- * @brief Release the default thread lock.
+ * @brief Releases the thread lock inside a critical section (interrupts
+ * disabled).
  *
- * @param[in] the_thread The thread.
+ * The previous interrupt status is not restored.
+ *
+ * @param[in] lock The lock.
  * @param[in] lock_context The lock context used for the corresponding lock
  * acquire.
  */
-RTEMS_INLINE_ROUTINE void _Thread_Lock_release_default(
-  Thread_Control   *the_thread,
+RTEMS_INLINE_ROUTINE void _Thread_Lock_release_critical(
+  ISR_lock_Control *lock,
   ISR_lock_Context *lock_context
 )
 {
-  _ISR_lock_Release_and_ISR_enable( &the_thread->Lock.Default, lock_context );
+  _ISR_lock_Release( lock, lock_context );
 }
 
 /**
- * @brief Release the thread lock.
+ * @brief Releases the thread lock.
  *
  * @param[in] lock The lock returned by _Thread_Lock_acquire().
  * @param[in] lock_context The lock context used for _Thread_Lock_acquire().
@@ -1034,7 +1037,49 @@ RTEMS_INLINE_ROUTINE void _Thread_Lock_release(
   ISR_lock_Context *lock_context
 )
 {
-  _ISR_lock_Release_and_ISR_enable( lock, lock_context );
+  _Thread_Lock_release_critical( lock, lock_context );
+  _ISR_lock_ISR_enable( lock_context );
+}
+
+/**
+ * @brief Releases the default thread lock inside a critical section
+ * (interrupts disabled).
+ *
+ * The previous interrupt status is not restored.
+ *
+ * @param[in] the_thread The thread.
+ * @param[in] lock_context The lock context used for the corresponding lock
+ * acquire.
+ */
+RTEMS_INLINE_ROUTINE void _Thread_Lock_release_default_critical(
+  Thread_Control   *the_thread,
+  ISR_lock_Context *lock_context
+)
+{
+  _Thread_Lock_release_critical(
+#if defined(RTEMS_SMP)
+    &the_thread->Lock.Default,
+#else
+    NULL,
+#endif
+    lock_context
+  );
+}
+
+/**
+ * @brief Releases the default thread lock.
+ *
+ * @param[in] the_thread The thread.
+ * @param[in] lock_context The lock context used for the corresponding lock
+ * acquire.
+ */
+RTEMS_INLINE_ROUTINE void _Thread_Lock_release_default(
+  Thread_Control   *the_thread,
+  ISR_lock_Context *lock_context
+)
+{
+  _Thread_Lock_release_default_critical( the_thread, lock_context );
+  _ISR_lock_ISR_enable( lock_context );
 }
 
 /**
@@ -1135,12 +1180,12 @@ RTEMS_INLINE_ROUTINE void _Thread_Lock_set(
   ISR_lock_Control *new_lock
 )
 {
-  ISR_lock_Control *lock;
-  ISR_lock_Context  lock_context;
+  ISR_lock_Context lock_context;
 
-  lock = _Thread_Lock_acquire( the_thread, &lock_context );
+  _Thread_Lock_acquire_default_critical( the_thread, &lock_context );
+  _Assert( the_thread->Lock.current == &the_thread->Lock.Default );
   _Thread_Lock_set_unprotected( the_thread, new_lock );
-  _Thread_Lock_release( lock, &lock_context );
+  _Thread_Lock_release_default_critical( the_thread, &lock_context );
 }
 #else
 #define _Thread_Lock_set( the_thread, new_lock ) \
-- 
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