fix isse #35: the gettimeofday jitter, log warn message

trunk/src/kernel/srs_kernel_utility.cpp

@@ -0,0 +1,55 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include <srs_kernel_utility.hpp>
+
+#include <sys/time.h>
+
+#include <srs_kernel_log.hpp>
+
+static int64_t _srs_system_time_us_cache = 0;
+
+int64_t srs_get_system_time_ms()
+{
+    return _srs_system_time_us_cache / 1000;
+}
+
+void srs_update_system_time_ms()
+{
+    timeval now;
+    
+    if (gettimeofday(&now, NULL) < 0) {
+        srs_warn("gettimeofday failed, ignore");
+        return;
+    }
+
+    // @see: https://github.com/winlinvip/simple-rtmp-server/issues/35
+    // we must convert the tv_sec/tv_usec to int64_t.
+    int64_t now_us = ((int64_t)now.tv_sec) * 1000 * 1000 + (int64_t)now.tv_usec;
+    if (now_us < _srs_system_time_us_cache) {
+        srs_warn("system time negative, "
+            "history=%"PRId64"us, now=%"PRId64"", _srs_system_time_us_cache, now_us);
+    }
+    
+    _srs_system_time_us_cache = now_us;
+}