Provide ability to lock port rewiring.

The idea is to allow only a "single" frontend to rewire ports at
a certain point in time. Regarding a stream, frontend_lock is used
for example to allow only a single frontend to change the speed.
Unfortunately, frontend_lock cannot be used as the rewire functions
are not stream related.
Therefore a new port_rewiring_lock was introduced and used at
appropriate locations. When an arbitrary thread now holds the
frontend_lock and the port_rewiring_lock, it is safe that acquiring
a port ticket in functions like xine_get_current_frame() will
never block the thread.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/xine-engine/xine_internal.h b/src/xine-engine/xine_internal.h
index da6f88a7f..e11c3e667 100644
--- a/src/xine-engine/xine_internal.h
+++ b/src/xine-engine/xine_internal.h
@@ -168,6 +168,9 @@ struct xine_ticket_s {
    * be used in combination with acquire_nonblocking() */
   void (*release_nonblocking)(xine_ticket_t *self, int irrevocable);
 
+  int (*lock_port_rewiring)(xine_ticket_t *self, int ms_timeout);
+  void (*unlock_port_rewiring)(xine_ticket_t *self);
+
   void (*dispose)(xine_ticket_t *self);
   
   pthread_mutex_t lock;
@@ -179,6 +182,7 @@ struct xine_ticket_s {
   int             pending_revocations;
   int             atomic_revoke;
   pthread_t       atomic_revoker_thread;
+  pthread_mutex_t port_rewiring_lock;
 #endif
 };