Changeset 08a19ba in mainline for kernel/generic/include/synch/mutex.h

Timestamp:

2008-06-23T18:44:48Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

1a1744e

Parents:

deaf8d5

Message:

Support for active mutexes. Active mutexes implement busy waiting, pretty much
in the same way as spinlocks, but can be passed to condition variables, which is
the motivation for this enhancement.

File:

• kernel/generic/include/synch/mutex.h (modified) (1 diff)

kernel/generic/include/synch/mutex.h

@@ -40 +40 @@
 #include <synch/synch.h>
 
+typedef enum {
+        MUTEX_PASSIVE,
+        MUTEX_ACTIVE
+} mutex_type_t;
+
 typedef struct {
+        mutex_type_t type;
         semaphore_t sem;
 } mutex_t;
 
-#define mutex_lock(mtx) \
+#define mutex_lock(mtx)                 \
         _mutex_lock_timeout((mtx), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
-#define mutex_trylock(mtx) \
+#define mutex_trylock(mtx)              \
         _mutex_lock_timeout((mtx), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)
-#define mutex_lock_timeout(mtx, usec) \
+#define mutex_lock_timeout(mtx, usec)   \
         _mutex_lock_timeout((mtx), (usec), SYNCH_FLAGS_NON_BLOCKING)
 
-extern void mutex_initialize(mutex_t *mtx);
-extern int _mutex_lock_timeout(mutex_t *mtx, uint32_t usec, int flags);
-extern void mutex_unlock(mutex_t *mtx);
+extern void mutex_initialize(mutex_t *, mutex_type_t);
+extern int _mutex_lock_timeout(mutex_t *, uint32_t, int);
+extern void mutex_unlock(mutex_t *);
 
 #endif