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