Changeset 709 for soft/giet_vm/giet_common/kernel_locks.c

Timestamp:

Oct 1, 2015, 4:20:46 PM (9 years ago)

Author:

alain

Message:

Major release: Change the task model to implement the POSIX threads API.

• The shell "exec" and "kill" commands can be used to activate/de-activate the applications.
• The "pause", "resume", and "context" commands can be used to stop, restart, a single thtead or to display the thread context.

This version has been tested on the following multi-threaded applications,
that have been modified to use the POSIX threads:

• classif
• convol
• transpose
• gameoflife
• raycast

File:

• soft/giet_vm/giet_common/kernel_locks.c (modified) (1 diff)

soft/giet_vm/giet_common/kernel_locks.c

@@ -70 +70 @@
         : "r" (ptr), "r" (mask)
         : "$10", "$11", "$12", "memory" );
+}
+
+/////////////////////////////////////////////////////
+unsigned int _atomic_test_and_set( unsigned int* ptr,
+                                   unsigned int  value )
+{
+    unsigned int ret = 1;
+
+    asm volatile (
+        "ori  %0,    $0,     1         \n"   /* default : ret <= 1       */
+        "move $10,   %1                \n"   /* $10 <= ptr               */
+        "move $11,   %2                \n"   /* $11 <= value             */
+        "ll   $12,   0($10)            \n"   /* $12 <= *ptr              */
+        "bne  $12,   $0,     1515f     \n"   /* return 1 if non zero     */
+        "sc   $11,   0($10)            \n"   /* *ptr <= $12              */ 
+        "beqz $11,           1515f     \n"   /* return 1 if failure      */
+        "ori  %0,    $0,     0         \n"   /* success : ret <= 0       */
+        "1515:                         \n"   
+        : "=r" (ret) 
+        : "r" (ptr), "r" (value)
+        : "$10", "$11", "$12", "memory" );
+
+    return ret;
 }