score: Add _ISR_lock_Flash()

2 files changed, 33 insertions, 0 deletions

diff --git a/cpukit/score/include/rtems/score/isrlock.h b/cpukit/score/include/rtems/score/isrlock.h
index d716b3898e..8449d5d64f 100644
--- a/cpukit/score/include/rtems/score/isrlock.h
+++ b/cpukit/score/include/rtems/score/isrlock.h
@@ -273,6 +273,37 @@ typedef struct {
   #define _ISR_lock_Release( _lock, _context )
 #endif
 
+/**
+ * @brief Flashes an ISR lock.
+ *
+ * On uni-processor configurations this a simple _ISR_Flash().  On SMP
+ * configurations this function releases an SMP lock, restores the interrupt
+ * status, then disables interrupts and acquires the SMP lock again.
+ *
+ * This function can be used in thread and interrupt context.
+ *
+ * @param[in] _lock The ISR lock control.
+ * @param[in] _context The local ISR lock context for an acquire and release
+ * pair.
+ *
+ * @see _ISR_lock_ISR_disable_and_acquire() and
+ * _ISR_lock_Release_and_ISR_enable().
+ */
+#if defined( RTEMS_SMP )
+  #define _ISR_lock_Flash( _lock, _context ) \
+    _SMP_lock_Release_and_ISR_enable( \
+      &( _lock )->Lock, \
+      &( _context )->Lock_context \
+    ); \
+    _SMP_lock_ISR_disable_and_acquire( \
+      &( _lock )->Lock, \
+      &( _context )->Lock_context \
+    )
+#else
+  #define _ISR_lock_Flash( _lock, _context ) \
+    _ISR_Flash( ( _context )->isr_level )
+#endif
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/testsuites/sptests/sp37/init.c b/testsuites/sptests/sp37/init.c
index f838f310a2..e8c415d5a7 100644
--- a/testsuites/sptests/sp37/init.c
+++ b/testsuites/sptests/sp37/init.c
@@ -179,6 +179,8 @@ static void test_isr_locks( void )
 
   _ISR_lock_ISR_disable_and_acquire( &lock, &lock_context );
   rtems_test_assert( normal_interrupt_level != _ISR_Get_level() );
+  _ISR_lock_Flash( &lock, &lock_context );
+  rtems_test_assert( normal_interrupt_level != _ISR_Get_level() );
   _ISR_lock_Release_and_ISR_enable( &lock, &lock_context );
 
   rtems_test_assert( normal_interrupt_level == _ISR_Get_level() );