ltt-usertrace/sample-thread-fast.c

   1
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6
   7 #define LTT_TRACE
   8 #define LTT_TRACE_FAST
   9 #include <ltt/ltt-facility-user_generic.h>
  10
  11
  12 void *thr1(void *arg)
  13 {
  14         int i;
  15         ltt_thread_init();      /* This init is not required : it will be done
  16                                                                                                  automatically anyways at the first tracing call site */
  17         printf("thread 1, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  18
  19         for(i=0; i<100000; i++) {
  20                 trace_user_generic_string("Hello world! Have a nice day.");
  21         }
  22         pthread_exit((void*)1);
  23 }
  24
  25
  26 /* Example of a _bad_ thread, which still works with the tracing */
  27 void *thr2(void *arg)
  28 {
  29         int i;
  30         /* See ? no init */
  31         printf("thread 2, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  32
  33         for(i=0; i<100000; i++) {
  34                 trace_user_generic_string("Hello world! Have a nice day.");
  35         }
  36         /* This thread is a bad citizen : returning like this will cause its cancel
  37          * routines not to be executed. This is still detected by the tracer, but only
  38          * when the complete process dies. This is not recommended if you create a
  39          * huge amount of threads */
  40         return ((void*)2);
  41 }
  42
  43
  44 int main()
  45 {
  46         int err;
  47         pthread_t tid1, tid2;
  48         void *tret;
  49
  50         printf("Will trace the following string : Hello world! Have a nice day.\n");
  51         printf("It will stop automatically.\n");
  52         printf("See the result file in /tmp/ltt-usertrace.\n");
  53
  54         printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  55         err = pthread_create(&tid1, NULL, thr1, NULL);
  56         if(err!=0) exit(1);
  57
  58         err = pthread_create(&tid2, NULL, thr2, NULL);
  59         if(err!=0) exit(1);
  60
  61         err = pthread_join(tid1, &tret);
  62         if(err!= 0) exit(1);
  63
  64         err = pthread_join(tid2, &tret);
  65         if(err!= 0) exit(1);
  66
  67         return 0;
  68 }