* The rw_lock is now able to nest read/write locks when you have a write lock.

It follows the semantics of the BFS R/W lock, though, that is, if you unlock
  your write lock before the read locks, the read locks effectively become
  write locks, too.
* Added a mutex_transfer_lock() function that will allow you to unlock a mutex
  in a different thread than the one which locked it (only matters if KDEBUG
  is enabled, though).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26316 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/fs_shell/fssh_api_wrapper.h

@@ -993,6 +993,7 @@
 #define mutex_lock					fssh_mutex_lock
 #define mutex_trylock				fssh_mutex_trylock
 #define mutex_unlock				fssh_mutex_unlock
+#define mutex_transfer_lock			fssh_mutex_transfer_lock
 
 
 ////////////////////////////////////////////////////////////////////////////////

headers/private/fs_shell/fssh_lock.h

@@ -32,6 +32,7 @@ typedef struct fssh_recursive_lock {
 
 typedef struct fssh_rw_lock {
 	fssh_sem_id		sem;
+	fssh_thread_id	holder;
 	int32_t			count;
 } fssh_rw_lock;
 
@@ -75,6 +76,7 @@ extern void fssh_mutex_destroy(fssh_mutex* lock);
 extern fssh_status_t fssh_mutex_lock(fssh_mutex* lock);
 extern fssh_status_t fssh_mutex_trylock(fssh_mutex* lock);
 extern void fssh_mutex_unlock(fssh_mutex* lock);
+extern void fssh_mutex_transfer_lock(fssh_mutex* lock, fssh_thread_id thread);
 
 #ifdef __cplusplus
 }