Changeset 5df7928 in mainline

Timestamp:

2010-05-25T21:33:52Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d7da4284

Parents:

b7398c0

Message:

Add interface for determining the semaphore count.

Location:

kernel/generic

Files:

• include/synch/semaphore.h (modified) (1 diff)
• src/synch/semaphore.c (modified) (2 diffs)

kernel/generic/include/synch/semaphore.h

@@ -56 +56 @@
 extern int _semaphore_down_timeout(semaphore_t *, uint32_t, unsigned int);
 extern void semaphore_up(semaphore_t *);
+extern int semaphore_count_get(semaphore_t *);
 
 #endif

kernel/generic/src/synch/semaphore.c

@@ -54 +54 @@
 {
         waitq_initialize(&sem->wq);
-        
-        irq_spinlock_lock(&sem->wq.lock, true);
-        sem->wq.missed_wakeups = val;
-        irq_spinlock_unlock(&sem->wq.lock, true);
+        waitq_count_set(&sem->wq, val);
 }
 
@@ -92 +89 @@
 }
 
+/** Get the semaphore counter value.
+ *
+ * @param sem           Semaphore.
+ * @return              The number of threads that can down the semaphore
+ *                      without blocking.
+ */
+int semaphore_count_get(semaphore_t *sem)
+{
+        return waitq_count_get(&sem->wq);
+}
+
 /** @}
  */