ltt-usertrace/sample-thread-slow.c

   1
   2 #include <pthread.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6
   7 #define LTT_TRACE
   8 //this one is a non blocking sample (not #define LTT_BLOCKING 1)
   9 #include <ltt/ltt-facility-user_generic.h>
  10
  11
  12 void *thr1(void *arg)
  13 {
  14         printf("thread 1, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  15
  16         while(1) {
  17                 trace_user_generic_string("Hello world! Have a nice day.");
  18                 sleep(2);
  19         }
  20         pthread_exit((void*)1);
  21 }
  22
  23
  24 /* Example of a _bad_ thread, which still works with the tracing */
  25 void *thr2(void *arg)
  26 {
  27         printf("thread 2, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  28         sleep(1);
  29         while(1) {
  30                 trace_user_generic_string("Hello world! Have a nice day.");
  31                 sleep(2);
  32         }
  33         return ((void*)2);
  34 }
  35
  36
  37 int main()
  38 {
  39         int err;
  40         pthread_t tid1, tid2;
  41         void *tret;
  42
  43         printf("Will trace the following string : Hello world! Have a nice day.\n");
  44         printf("Press CTRL-C to stop.\n");
  45         printf("No file is created with this example : it logs through a kernel\n");
  46         printf("system call. See the LTTng lttctl command to start tracing.\n\n");
  47
  48         printf("thread main, thread id : %lu, pid %lu\n", pthread_self(), getpid());
  49         err = pthread_create(&tid1, NULL, thr1, NULL);
  50         if(err!=0) exit(1);
  51
  52         err = pthread_create(&tid2, NULL, thr2, NULL);
  53         if(err!=0) exit(1);
  54
  55         err = pthread_join(tid1, &tret);
  56         if(err!= 0) exit(1);
  57
  58         err = pthread_join(tid2, &tret);
  59         if(err!= 0) exit(1);
  60
  61         return 0;
  62 }