Don't use rdtsc for high res timestamp on Linux as it's highly inaccurate (for now)

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@387 74dad513-b988-da41-8d7b-12977e46ad98

pjlib/src/pj/os_timestamp_linux.c

@@ -23,7 +23,10 @@
 #include <stdlib.h>
 #include <ctype.h>
 
-#if defined(PJ_HAS_PENTIUM) && PJ_HAS_PENTIUM!=0
+#if defined(PJ_HAS_PENTIUM) && PJ_HAS_PENTIUM!=0 && \
+    defined(PJ_TIMESTAMP_USE_RDTSC) && PJ_TIMESTAMP_USE_RDTSC!=0 && \
+    defined(PJ_M_I386) && PJ_M_I386!=0 && \
+    defined(PJ_LINUX) && PJ_LINUX!=0
 static int machine_speed_mhz;
 static pj_timestamp machine_speed;
 

pjlib/src/pjlib-test/timestamp.c

@@ -99,6 +99,9 @@ static int timestamp_accuracy()
 			     "%d msec", 
 			     (pj_uint32_t)(diff * 1000000 / freq.u64), 
 			     msec));
+    } else {
+	PJ_LOG(3,(THIS_FILE, "....good. Timestamp is accurate down to"
+			     " nearest usec."));
     }
 
     return 0;