dispose the gop cache

@@ -523,6 +523,8 @@ void SrsServer::destroy()
     ingester->dispose();
 #endif
     
+    SrsSource::dispose_all();
+    
 #ifdef SRS_AUTO_HTTP_API
     srs_freep(http_api_mux);
 #endif

@@ -583,6 +583,11 @@ SrsGopCache::~SrsGopCache()
     clear();
 }
 
+void SrsGopCache::dispose()
+{
+    clear();
+}
+
 void SrsGopCache::set(bool enabled)
 {
     enable_gop_cache = enabled;
@@ -955,6 +960,8 @@ void SrsSource::dispose()
 #ifdef SRS_AUTO_HLS
     hls->dispose();
 #endif
+    
+    gop_cache->dispose();
 }
 
 int SrsSource::cycle()

@@ -310,6 +310,10 @@ public:
     virtual ~SrsGopCache();
 public:
     /**
+     * cleanup when system quit.
+     */
+    virtual void dispose();
+    /**
     * to enable or disable the gop cache.
     */
     virtual void set(bool enabled);