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/* This testcase is part of GDB, the GNU debugger.
Copyright 2014-2017 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
/* Used to individually advance each thread to the desired stopping point. */
int ready;
sig_atomic_t sigusr1_received;
sig_atomic_t sigusr2_received;
sig_atomic_t sigabrt_received;
/* Number of threads currently running. */
int thread_count;
pthread_mutex_t thread_count_mutex;
pthread_cond_t thread_count_condvar;
static void
incr_thread_count (void)
{
pthread_mutex_lock (&thread_count_mutex);
++thread_count;
pthread_cond_signal (&thread_count_condvar);
pthread_mutex_unlock (&thread_count_mutex);
}
static void
sigusr1_handler (int sig)
{
sigusr1_received = 1;
}
static void
sigusr2_handler (int sig)
{
sigusr2_received = 1;
}
static void
sigabrt_handler (int sig)
{
sigabrt_received = 1;
}
static void *
sigusr1_thread_function (void *unused)
{
incr_thread_count ();
while (!ready)
usleep (100);
pthread_kill (pthread_self (), SIGUSR1);
}
static void *
sigusr2_thread_function (void *unused)
{
incr_thread_count ();
while (!ready)
usleep (100);
/* pthread_kill (pthread_self (), SIGUSR2); - manually injected by gdb */
}
/* Wait until all threads are at a point where a backtrace will
show the thread entry point function. */
static void
wait_all_threads_running (int nr_threads)
{
pthread_mutex_lock (&thread_count_mutex);
while (1)
{
if (thread_count == nr_threads)
{
pthread_mutex_unlock (&thread_count_mutex);
return;
}
pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
}
}
static void
all_threads_running (void)
{
while (!ready)
usleep (100);
}
static void
all_threads_done (void)
{
}
int
main ()
{
pthread_t sigusr1_thread, sigusr2_thread;
/* Protect against running forever. */
alarm (60);
signal (SIGUSR1, sigusr1_handler);
signal (SIGUSR2, sigusr2_handler);
signal (SIGABRT, sigabrt_handler);
/* Don't let any thread advance past initialization. */
ready = 0;
pthread_mutex_init (&thread_count_mutex, NULL);
pthread_cond_init (&thread_count_condvar, NULL);
#define NR_THREADS 2
pthread_create (&sigusr1_thread, NULL, sigusr1_thread_function, NULL);
pthread_create (&sigusr2_thread, NULL, sigusr2_thread_function, NULL);
wait_all_threads_running (NR_THREADS);
all_threads_running ();
pthread_kill (pthread_self (), SIGABRT);
pthread_join (sigusr1_thread, NULL);
pthread_join (sigusr2_thread, NULL);
all_threads_done ();
return 0;
}
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