Changeset 228 for soft/giet_vm/libs/spin_lock.c

Timestamp:

Feb 12, 2013, 6:33:31 PM (11 years ago)

Author:

meunier

Message:

Added support for memspaces and const.
Added an interrupt masking to the "giet_context_switch" syscall
Corrected two bugs in boot/boot_init.c (one minor and one regarding barriers initialization)
Reformatted the code in all files.

File:

• soft/giet_vm/libs/spin_lock.c (modified) (1 diff)

soft/giet_vm/libs/spin_lock.c

@@ -28 +28 @@
 // If the lock is already taken a random delay is introduced before retry.
 ///////////////////////////////////////////////////////////////////////////////////
-void lock_acquire( giet_lock_t* lock )
-{
-    unsigned int*       plock = &lock->value;
- 
+void lock_acquire(giet_lock_t * lock) {
+    unsigned int * plock = &lock->value;
+
     asm volatile (
-            "giet_lock_try:                                     \n"
-            "ll   $2,    0(%0)                          \n" /* $2 <= lock current value */
-            "bnez $2,    giet_lock_delay        \n" /* retry if lock already taken */
-            "li   $3,    1                                      \n" /* $3 <= argument for sc */
-            "sc   $3,    0(%0)                          \n" /* try to get lock */
-            "bnez $3,    giet_lock_ok           \n" /* exit if atomic */
+            "giet_lock_try:                 \n"
+            "ll   $2,    0(%0)              \n" /* $2 <= lock current value */
+            "bnez $2,    giet_lock_delay    \n" /* retry if lock already taken */
+            "li   $3,    1                  \n" /* $3 <= argument for sc */
+            "sc   $3,    0(%0)              \n" /* try to get lock */
+            "bnez $3,    giet_lock_ok       \n" /* exit if atomic */
 
-            "giet_lock_delay:                           \n"
-            "jal  giet_rand                                 \n" /* giet_rand() system call */
-            "nop                                                        \n"
-            "andi $4,   $2,     0xFF                    \n"     /* $4 <= delay < 256 cycles */
+            "giet_lock_delay:               \n"
+            "jal  giet_rand                 \n" /* giet_rand() system call */
+            "nop                            \n"
+            "andi $4,    $2,    0xFF        \n" /* $4 <= delay < 256 cycles */
 
-            "giet_lock_loop:                            \n"
-            "addi $4,    $4,  -1                        \n" /* $4 <= $4 - 1 */
-            "beqz $4,    giet_lock_loop         \n" /* test end delay */
-            "nop                                                        \n"
-            "j           giet_lock_try          \n" /* retry */
-            "nop                                                        \n"
-            "giet_lock_ok:                                      \n"
+            "giet_lock_loop:                \n"
+            "addi $4,    $4,  -1            \n" /* $4 <= $4 - 1 */
+            "beqz $4,    giet_lock_loop     \n" /* test end delay */
+            "nop                            \n"
+            "j           giet_lock_try      \n" /* retry */
+            "nop                            \n"
+            "giet_lock_ok:                  \n"
             :
             :"r"(plock)
             :"$2", "$3", "$4");
-} 
+}
+
 
 //////////////////////////////////////////////////////////////////////////////
 // lock_release()
 //////////////////////////////////////////////////////////////////////////////
-void lock_release( giet_lock_t* lock)
-{
+void lock_release(giet_lock_t * lock) {
     lock->value = 0;
 }
 
+
+// Local Variables:
+// tab-width: 4
+// c-basic-offset: 4
+// c-file-offsets:((innamespace . 0)(inline-open . 0))
+// indent-tabs-mode: nil
+// End:
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4
+