update st research.

+#include <unistd.h>
+#include <stdio.h>
+
 #include "public.h"
 
+#define srs_trace(msg, ...)   printf(msg, ##__VA_ARGS__);printf("\n")
+
+void* pfn(void* arg)
+{
+    st_sleep(1);
+    srs_trace("st thread is ok");
+    return NULL;
+}
+
 int main(int argc, char** argv)
 {
+    if (st_set_eventsys(ST_EVENTSYS_ALT) < 0) {
+        srs_trace("st_set_eventsys failed");
+        return -1;
+    }
+    
+    if (st_init() < 0) {
+        srs_trace("st_init failed");
+        return -1;
+    }
+    
+    if (!st_thread_create(pfn, NULL, 0, 0)) {
+        srs_trace("st_thread_create failed");
+        return -1;
+    }
+    
+    srs_trace("st is ok");
+    
+    st_thread_exit(NULL);
+    
     return 0;
 }