ipcpd: shim-udp: complete locking

Added necessary locks for the shim-udp.  This PR also improves thread
management, the main thread now starts a mainloop thread, which spawns
sdu handler threads when it the IPCP is enrolled. If the IPCP exits
the enrolled state, the sdu loop is cancelled.

1 files changed, 4 insertions, 5 deletions

diff --git a/src/lib/shm_ap_rbuff.c b/src/lib/shm_ap_rbuff.c
index 6c977cbb..6c04ccc5 100644
--- a/src/lib/shm_ap_rbuff.c
+++ b/src/lib/shm_ap_rbuff.c
@@ -245,18 +245,17 @@ struct rb_entry * shm_ap_rbuff_read(struct shm_ap_rbuff * rb)
         if (rb == NULL)
                 return NULL;
 
-        e = malloc(sizeof(*e));
-        if (e == NULL)
-                return NULL;
-
         pthread_mutex_lock(rb->shm_mutex);
 
         if (shm_rbuff_used(rb) == 0) {
                 pthread_mutex_unlock(rb->shm_mutex);
-                free(e);
                 return NULL;
         }
 
+        e = malloc(sizeof(*e));
+        if (e == NULL)
+                return NULL;
+
         *e = *(rb->shm_base + *rb->ptr_tail);
 
         *rb->ptr_tail = (*rb->ptr_tail + 1) & (SHM_RBUFF_SIZE -1);