1 /* Test case for C-c sent to threads with pending signals. Before I 2 even get there, creating a thread and sending it a signal before it 3 has a chance to run leads to an internal error in GDB. We need to 4 record that there's a pending SIGSTOP, so that we'll ignore it 5 later, and pass the current signal back to the thread. 6 7 The fork/vfork case has similar trouble but that's even harder 8 to get around. We may need to send a SIGCONT to cancel out the 9 SIGSTOP. Different kernels may do different things if the thread 10 is stopped by ptrace and sent a SIGSTOP. */ 11 12 #include <stdio.h> 13 #include <unistd.h> 14 #include <stdlib.h> 15 #include <pthread.h> 16 #include <signal.h> 17 18 /* Loop long enough for GDB to send a few signals of its own, but 19 don't hang around eating CPU forever if something goes wrong during 20 testing. */ 21 #define NSIGS 10000000 22 23 pthread_barrier_t barrier; 24 25 void 26 handler (int sig) 27 { 28 ; 29 } 30 31 pthread_t main_thread; 32 pthread_t child_thread, child_thread_two; 33 34 void * 35 child_two (void *arg) 36 { 37 int i; 38 39 pthread_barrier_wait (&barrier); 40 41 for (i = 0; i < NSIGS; i++) 42 pthread_kill (child_thread, SIGUSR1); 43 } 44 45 void * 46 thread_function (void *arg) 47 { 48 int i; 49 50 pthread_barrier_wait (&barrier); 51 52 for (i = 0; i < NSIGS; i++) 53 pthread_kill (child_thread_two, SIGUSR2); 54 } 55 56 int main() 57 { 58 int i; 59 60 signal (SIGUSR1, handler); 61 signal (SIGUSR2, handler); 62 63 pthread_barrier_init (&barrier, NULL, 3); 64 65 main_thread = pthread_self (); 66 pthread_create (&child_thread, NULL, thread_function, NULL); 67 pthread_create (&child_thread_two, NULL, child_two, NULL); 68 69 pthread_barrier_wait (&barrier); 70 71 for (i = 0; i < NSIGS; i++) 72 pthread_kill (child_thread_two, SIGUSR1); 73 74 pthread_join (child_thread, NULL); 75 76 exit (0); 77 } 78