1 #include <stdlib.h>
2 #include <string.h>
3 #include <unistd.h>
4 #include <errno.h>
5 #include <stdio.h>
6 #include <signal.h>
7 #include <pthread.h>
8
9 static void sig_usr1(int);
10
11 static pthread_t main_thread;
12
13 void *
child_main(void * no_args)14 child_main(void *no_args)
15 {
16 // int i;
17
18 // Only do it once, to shorten test --njn
19 // for (i = 0; i < 5; ++i)
20 // {
21 sleep (1);
22 fprintf (stdout, "thread CHILD sending SIGUSR1 to thread MAIN\n");
23 if (pthread_kill (main_thread, SIGUSR1) != 0)
24 fprintf (stderr, "error doing pthread_kill\n");
25 // }
26
27 return no_args;
28 }
29
30 int
main(void)31 main(void)
32 {
33 struct sigaction sigact;
34 sigset_t newmask, oldmask;
35 pthread_t child;
36
37 memset(&newmask, 0, sizeof newmask);
38 sigemptyset (&newmask);
39 sigaddset (&newmask, SIGUSR1);
40
41 if (pthread_sigmask (SIG_BLOCK, &newmask, &oldmask) != 0)
42 fprintf (stderr, "SIG_BLOCK error");
43
44 memset (&sigact, 0, sizeof sigact);
45 sigact.sa_handler = sig_usr1;
46 if (sigaction(SIGUSR1, &sigact, NULL) != 0)
47 fprintf (stderr, "signal(SIGINT) error");
48
49 main_thread = pthread_self ();
50 if (pthread_create (&child, NULL, child_main, NULL) != 0)
51 fprintf (stderr, "error creating thread");
52
53 pthread_join (child, NULL);
54
55 exit(0);
56 }
57
58 static void
sig_usr1(int signo)59 sig_usr1 (int signo)
60 {
61 fprintf (stderr, "SHOULD NOT BE HERE (SIGUSR1)!!!!\n");
62 return;
63 }
64
65
66