Changes between Version 17 and Version 18 of kernel_locks

Timestamp:

Sep 17, 2015, 2:06:25 PM (10 years ago)

Author:

alain

Comment:

--

kernel_locks

@@ -35 +35 @@
  * '''mask''' : *ptr <= *ptr & mask
 
+ === __int '''_atomic_test_and_set'''( unsigned int*  shared , unsigned int value ) ===
+This NON-blocking function test the current value of the variable pointed by the <shared> argument. 
+If the current value is 0, it uses an SC to give atomically a new value to the pointed variable.
+ * '''shared''' : pointer on the shared variable
+ * '''value''' : new value to be written in case of success.
+
+Returns 0 if success.
+Returns 1 if current value is non zero, or non atomic access.
+
 == Simple lock access functions ==
 
@@ -66 +75 @@
  === __void '''_sqt_lock_release'''( sqt_lock_t*  lock )__ ===
 This function releases the SQT lock: It reset all "partial" locks on the path from bottom to top, using a normal write, and starting from bottom.
-