fix #109: fix the system jump time, adjust system startup time. 0.9.135

@@ -242,6 +242,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v1.0, 2014-06-25, fix [#109](https://github.com/winlinvip/simple-rtmp-server/issues/109), fix the system jump time, adjust system startup time. 0.9.135
 * <strong>v1.0, 2014-06-27, [1.0 mainline5(0.9.134)](https://github.com/winlinvip/simple-rtmp-server/releases/tag/1.0.mainline5) released. 41573 lines.</strong>
 * v1.0, 2014-06-27, SRS online 30days with RTMP/HLS.
 * v1.0, 2014-06-25, fix [#108](https://github.com/winlinvip/simple-rtmp-server/issues/108), support config time jitter for encoder non-monotonical stream. 0.9.133

@@ -61,6 +61,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // update time interval:
 //      SRS_SYS_CYCLE_INTERVAL * SRS_SYS_TIME_RESOLUTION_MS_TIMES
+// @see SYS_TIME_RESOLUTION_US
 #define SRS_SYS_TIME_RESOLUTION_MS_TIMES 3
 
 // update rusage interval:
@@ -399,6 +400,9 @@ int SrsServer::initialize()
 {
     int ret = ERROR_SUCCESS;
     
+    // ensure the time is ok.
+    srs_update_system_time_ms();
+    
     // for the main objects(server, config, log, context),
     // never subscribe handler in constructor,
     // instead, subscribe handler in initialize method.

@@ -76,8 +76,7 @@ void srs_update_system_rusage()
         srs_warn("getrusage failed, ignore");
         return;
     }
-        
-    srs_update_system_time_ms();
+    
     _srs_system_rusage.sample_time = srs_get_system_time_ms();
     
     _srs_system_rusage.ok = true;
@@ -233,8 +232,6 @@ bool get_proc_self_stat(SrsProcSelfStat& r)
 
 void srs_update_proc_stat()
 {
-    srs_update_system_time_ms();
-    
     // system cpu stat
     if (true) {
         SrsProcSystemStat r;
@@ -266,7 +263,6 @@ void srs_update_proc_stat()
             return;
         }
         
-        srs_update_system_time_ms();
         r.sample_time = srs_get_system_time_ms();
         
         // calc usage in percent
@@ -390,7 +386,7 @@ SrsPlatformInfo::SrsPlatformInfo()
 {
     ok = false;
     
-    srs_startup_time = srs_get_system_time_ms();
+    srs_startup_time = 0;
     
     os_uptime = 0;
     os_ilde_time = 0;
@@ -412,6 +408,8 @@ void srs_update_platform_info()
     SrsPlatformInfo& r = _srs_system_platform_info;
     r.ok = true;
     
+    r.srs_startup_time = srs_get_system_startup_time_ms();
+    
     if (true) {
         FILE* f = fopen("/proc/uptime", "r");
         if (f == NULL) {

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "134"
+#define VERSION_REVISION "135"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"

@@ -33,7 +33,13 @@ using namespace std;
 
 #include <srs_kernel_log.hpp>
 
+// this value must:
+// equals to (SRS_SYS_CYCLE_INTERVAL*SRS_SYS_TIME_RESOLUTION_MS_TIMES)*1000
+// @see SRS_SYS_TIME_RESOLUTION_MS_TIMES
+#define SYS_TIME_RESOLUTION_US 300*1000
+
 static int64_t _srs_system_time_us_cache = 0;
+static int64_t _srs_system_time_startup_time = 0;
 
 int64_t srs_get_system_time_ms()
 {
@@ -43,7 +49,14 @@ int64_t srs_get_system_time_ms()
     
     return _srs_system_time_us_cache / 1000;
 }
-
+int64_t srs_get_system_startup_time_ms()
+{
+    if (_srs_system_time_startup_time <= 0) {
+        srs_update_system_time_ms();
+    }
+    
+    return _srs_system_time_startup_time / 1000;
+}
 void srs_update_system_time_ms()
 {
     timeval now;
@@ -56,12 +69,32 @@ void srs_update_system_time_ms()
     // @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);
+    
+    // for some ARM os, the starttime maybe invalid,
+    // for example, on the cubieboard2, the srs_startup_time is 1262304014640,
+    // while now is 1403842979210 in ms, diff is 141538964570 ms, 1638 days
+    // it's impossible, and maybe the problem of startup time is invalid.
+    // use date +%s to get system time is 1403844851.
+    // so we use relative time.
+    if (_srs_system_time_us_cache <= 0) {
+        _srs_system_time_us_cache = now_us;
+        _srs_system_time_startup_time = now_us;
+        return;
+    }
+    
+    // use relative time.
+    int64_t diff = now_us - _srs_system_time_us_cache;
+    diff = srs_max(0, diff);
+    if (diff < 0 || diff > 1000 * SYS_TIME_RESOLUTION_US) {
+        srs_warn("system time jump, history=%"PRId64"us, now=%"PRId64"us, diff=%"PRId64"us", 
+            _srs_system_time_us_cache, now_us, diff);
+        // @see: https://github.com/winlinvip/simple-rtmp-server/issues/109
+        _srs_system_time_startup_time += diff;
     }
     
     _srs_system_time_us_cache = now_us;
+    srs_info("system time updated, startup=%"PRId64"us, now=%"PRId64"us", 
+        _srs_system_time_startup_time, _srs_system_time_us_cache);
 }
 
 string srs_dns_resolve(string host)

@@ -38,6 +38,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 // get current system time in ms, use cache to avoid performance problem
 extern int64_t srs_get_system_time_ms();
+extern int64_t srs_get_system_startup_time_ms();
 // the deamon st-thread will update it.
 extern void srs_update_system_time_ms();