mpegts table: use atomic refcounting

src/atomic.h

@@ -24,6 +24,12 @@ atomic_add(volatile int *ptr, int incr)
   return __sync_fetch_and_add(ptr, incr);
 }
 
+static inline int
+atomic_dec(volatile int *ptr, int decr)
+{
+  return __sync_fetch_and_sub(ptr, decr);
+}
+
 static inline int
 atomic_exchange(volatile int *ptr, int new)
 {

src/input/mpegts.h

@@ -24,6 +24,7 @@
 #error "Use header file input.h not input/mpegts.h"
 #endif
 
+#include "atomic.h"
 #include "input.h"
 #include "service.h"
 #include "mpegts/dvb.h"
@@ -198,7 +199,7 @@ struct mpegts_table
   int mt_mask;  //              mask
 
   int mt_destroyed; // Refcounting
-  int mt_refcount;
+  int mt_arefcount;
 
   int8_t mt_cc;
 
@@ -794,14 +795,19 @@ void mpegts_input_close_pid
 void mpegts_table_dispatch
   (const uint8_t *sec, size_t r, void *mt);
 static inline void mpegts_table_grab
-  (mpegts_table_t *mt) { mt->mt_refcount++; }
+  (mpegts_table_t *mt)
+{
+  int v = atomic_add(&mt->mt_arefcount, 1);
+  assert(v > 0);
+}
 void mpegts_table_release_
   (mpegts_table_t *mt);
 static inline void mpegts_table_release
   (mpegts_table_t *mt)
 {
-  assert(mt->mt_refcount > 0);
-  if(--mt->mt_refcount == 0) {
+  int v = atomic_dec(&mt->mt_arefcount, 1);
+  assert(v > 0);
+  if (v == 1) {
     assert(mt->mt_destroyed == 1);
     mpegts_table_release_(mt);
   }

src/input/mpegts/mpegts_table.c

@@ -241,16 +241,16 @@ mpegts_table_add
 
   /* Create */
   mt = calloc(1, sizeof(mpegts_table_t));
-  mt->mt_refcount = 1;
-  mt->mt_name     = strdup(name);
-  mt->mt_callback = callback;
-  mt->mt_opaque   = opaque;
-  mt->mt_pid      = pid;
-  mt->mt_flags    = flags & ~(MT_SKIPSUBS|MT_SCANSUBS);
-  mt->mt_table    = tableid;
-  mt->mt_mask     = mask;
-  mt->mt_mux      = mm;
-  mt->mt_cc       = -1;
+  mt->mt_arefcount = 1;
+  mt->mt_name      = strdup(name);
+  mt->mt_callback  = callback;
+  mt->mt_opaque    = opaque;
+  mt->mt_pid       = pid;
+  mt->mt_flags     = flags & ~(MT_SKIPSUBS|MT_SCANSUBS);
+  mt->mt_table     = tableid;
+  mt->mt_mask      = mask;
+  mt->mt_mux       = mm;
+  mt->mt_cc        = -1;
 
   /* Open table */
   if (pid < 0) {