X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=ltt-usertrace%2Fsample-thread-fast.c;h=46ffbd12ff3f5b27df1e307763204cf6e37fd1c0;hb=70185ef663a3cd2de43af410d9578dbac997ff04;hp=d98c86f5487fdc91c55b5a87ca5f923de2955ac7;hpb=7d33c02d3f64dcfe7e3c8d5bdd66bfb375ba85c8;p=lttv.git

diff --git a/ltt-usertrace/sample-thread-fast.c b/ltt-usertrace/sample-thread-fast.c
index d98c86f5..46ffbd12 100644
--- a/ltt-usertrace/sample-thread-fast.c
+++ b/ltt-usertrace/sample-thread-fast.c
@@ -5,32 +5,39 @@
 #include <stdlib.h>
 
 #define LTT_TRACE
-//this one is a non blocking sample (not #define LTT_BLOCKING 1)
+#define LTT_TRACE_FAST
 #include <ltt/ltt-facility-user_generic.h>
 
 
 void *thr1(void *arg)
 {
-  printf("thread 1, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+	int i;
+	ltt_thread_init();	/* This init is not required : it will be done
+												 automatically anyways at the first tracing call site */
+	printf("thread 1, thread id : %lu, pid %lu\n", pthread_self(), getpid());
 
-  while(1) {
+	for(i=0; i<100000; i++) {
 		trace_user_generic_string("Hello world! Have a nice day.");
-		sleep(2);
 	}
-
-  return ((void*)1);
-
+	pthread_exit((void*)1);
 }
 
+
+/* Example of a _bad_ thread, which still works with the tracing */
 void *thr2(void *arg)
 {
-  printf("thread 2, thread id : %lu, pid %lu\n", pthread_self(), getpid());
-	sleep(1);
-  while(1) {
+	int i;
+	/* See ? no init */
+	printf("thread 2, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+
+	for(i=0; i<100000; i++) {
 		trace_user_generic_string("Hello world! Have a nice day.");
-    sleep(2);
-  }
-  return ((void*)2);
+	}
+	/* This thread is a bad citizen : returning like this will cause its cancel
+	 * routines not to be executed. This is still detected by the tracer, but only
+	 * when the complete process dies. This is not recommended if you create a
+	 * huge amount of threads */
+	return ((void*)2);
 }
 
 
@@ -41,22 +48,21 @@ int main()
 	void *tret;
 
 	printf("Will trace the following string : Hello world! Have a nice day.\n");
-	printf("Press CTRL-C to stop.\n");
-  printf("No file is created with this example : it logs through a kernel\n");
-  printf("system call. See the LTTng lttctl command to start tracing.\n\n");
+	printf("It will stop automatically.\n");
+	printf("See the result file in /tmp/ltt-usertrace.\n");
 
-  printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
-  err = pthread_create(&tid1, NULL, thr1, NULL);
-  if(err!=0) exit(1);
+	printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
+	err = pthread_create(&tid1, NULL, thr1, NULL);
+	if(err!=0) exit(1);
 
-  err = pthread_create(&tid2, NULL, thr2, NULL);
-  if(err!=0) exit(1);
+	err = pthread_create(&tid2, NULL, thr2, NULL);
+	if(err!=0) exit(1);
 
-  err = pthread_join(tid1, &tret);
-  if(err!= 0) exit(1);
+	err = pthread_join(tid1, &tret);
+	if(err!= 0) exit(1);
 
-  err = pthread_join(tid2, &tret);
-  if(err!= 0) exit(1);
-  
-  return 0;
+	err = pthread_join(tid2, &tret);
+	if(err!= 0) exit(1);
+	
+	return 0;
 }