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[lttv.git] / ltt-usertrace / sample-thread-fast.c

diff --git a/ltt-usertrace/sample-thread-fast.c b/ltt-usertrace/sample-thread-fast.c
index d98c86f5487fdc91c55b5a87ca5f923de2955ac7..46ffbd12ff3f5b27df1e307763204cf6e37fd1c0 100644 (file)
--- 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;
 }