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57cbd724c3
The test does a backtrace to see which thread (#2 or #3) is assigned to which SIGUSR (1 or 2). If the main thread gets to all_threads_running before the sigusr threads get to their entry point, then the function name isn't in the backtrace and the test fails. Alas this version of the code is within epsilon of what I started with, and then over-simplified things.
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2014 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* Used to individually advance each thread to the desired stopping point. */
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int ready;
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sig_atomic_t sigusr1_received;
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sig_atomic_t sigusr2_received;
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sig_atomic_t sigabrt_received;
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/* Number of threads currently running. */
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int thread_count;
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pthread_mutex_t thread_count_mutex;
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pthread_cond_t thread_count_condvar;
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static void
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incr_thread_count (void)
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{
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pthread_mutex_lock (&thread_count_mutex);
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++thread_count;
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pthread_cond_signal (&thread_count_condvar);
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pthread_mutex_unlock (&thread_count_mutex);
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}
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static void
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sigusr1_handler (int sig)
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{
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sigusr1_received = 1;
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}
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static void
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sigusr2_handler (int sig)
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{
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sigusr2_received = 1;
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}
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static void
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sigabrt_handler (int sig)
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{
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sigabrt_received = 1;
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}
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static void *
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sigusr1_thread_function (void *unused)
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{
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incr_thread_count ();
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while (!ready)
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usleep (100);
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pthread_kill (pthread_self (), SIGUSR1);
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}
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static void *
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sigusr2_thread_function (void *unused)
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{
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incr_thread_count ();
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while (!ready)
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usleep (100);
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/* pthread_kill (pthread_self (), SIGUSR2); - manually injected by gdb */
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}
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/* Wait until all threads are at a point where a backtrace will
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show the thread entry point function. */
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static void
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wait_all_threads_running (int nr_threads)
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{
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pthread_mutex_lock (&thread_count_mutex);
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while (1)
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{
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if (thread_count == nr_threads)
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{
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pthread_mutex_unlock (&thread_count_mutex);
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return;
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}
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pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
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}
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}
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static void
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all_threads_running (void)
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{
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while (!ready)
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usleep (100);
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}
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static void
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all_threads_done (void)
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{
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}
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int
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main ()
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{
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pthread_t sigusr1_thread, sigusr2_thread;
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/* Protect against running forever. */
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alarm (60);
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signal (SIGUSR1, sigusr1_handler);
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signal (SIGUSR2, sigusr2_handler);
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signal (SIGABRT, sigabrt_handler);
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/* Don't let any thread advance past initialization. */
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ready = 0;
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pthread_mutex_init (&thread_count_mutex, NULL);
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pthread_cond_init (&thread_count_condvar, NULL);
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#define NR_THREADS 2
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pthread_create (&sigusr1_thread, NULL, sigusr1_thread_function, NULL);
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pthread_create (&sigusr2_thread, NULL, sigusr2_thread_function, NULL);
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wait_all_threads_running (NR_THREADS);
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all_threads_running ();
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pthread_kill (pthread_self (), SIGABRT);
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pthread_join (sigusr1_thread, NULL);
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pthread_join (sigusr2_thread, NULL);
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all_threads_done ();
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return 0;
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}
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