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/* Test case for C-c sent to threads with pending signals. Before I
even get there, creating a thread and sending it a signal before it
has a chance to run leads to an internal error in GDB. We need to
record that there's a pending SIGSTOP, so that we'll ignore it
later, and pass the current signal back to the thread.
The fork/vfork case has similar trouble but that's even harder
to get around. We may need to send a SIGCONT to cancel out the
SIGSTOP. Different kernels may do different things if the thread
is stopped by ptrace and sent a SIGSTOP. */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <signal.h>
/* Loop long enough for GDB to send a few signals of its own, but
don't hang around eating CPU forever if something goes wrong during
testing. */
#define NSIGS 10000000
pthread_barrier_t barrier;
void
handler (int sig)
{
;
}
pthread_t main_thread;
pthread_t child_thread, child_thread_two;
void *
child_two (void *arg)
{
int i;
pthread_barrier_wait (&barrier);
for (i = 0; i < NSIGS; i++)
pthread_kill (child_thread, SIGUSR1);
}
void *
thread_function (void *arg)
{
int i;
pthread_barrier_wait (&barrier);
for (i = 0; i < NSIGS; i++)
pthread_kill (child_thread_two, SIGUSR2);
}
int main()
{
int i;
signal (SIGUSR1, handler);
signal (SIGUSR2, handler);
pthread_barrier_init (&barrier, NULL, 3);
main_thread = pthread_self ();
pthread_create (&child_thread, NULL, thread_function, NULL);
pthread_create (&child_thread_two, NULL, child_two, NULL);
pthread_barrier_wait (&barrier);
for (i = 0; i < NSIGS; i++)
pthread_kill (child_thread_two, SIGUSR1);
pthread_join (child_thread, NULL);
exit (0);
}
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