| /* This testcase is part of GDB, the GNU debugger. |
| |
| Copyright 2015-2016 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 <assert.h> |
| #include <pthread.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| |
| /* Number of threads. Each thread continuously spawns a fork and wait |
| for it. If we have another thread continuously start a step over, |
| gdbserver should end up finding new forks while suspending |
| threads. */ |
| #define NTHREADS 10 |
| |
| pthread_t threads[NTHREADS]; |
| |
| pthread_barrier_t barrier; |
| |
| #define NFORKS 10 |
| |
| /* Used to create a conditional breakpoint that always fails. */ |
| volatile int zero; |
| |
| static void * |
| thread_forks (void *arg) |
| { |
| int i; |
| |
| pthread_barrier_wait (&barrier); |
| |
| for (i = 0; i < NFORKS; i++) |
| { |
| pid_t pid; |
| |
| do |
| { |
| pid = fork (); |
| } |
| while (pid == -1 && errno == EINTR); |
| |
| if (pid > 0) |
| { |
| int status; |
| |
| /* Parent. */ |
| do |
| { |
| pid = waitpid (pid, &status, 0); |
| } |
| while (pid == -1 && errno == EINTR); |
| |
| if (pid == -1) |
| { |
| perror ("wait"); |
| exit (1); |
| } |
| |
| if (!WIFEXITED (status)) |
| { |
| printf ("Unexpected wait status 0x%x from child %d\n", |
| status, pid); |
| } |
| } |
| else if (pid == 0) |
| { |
| /* Child. */ |
| exit (0); |
| } |
| else |
| { |
| perror ("fork"); |
| exit (1); |
| } |
| } |
| } |
| |
| /* Set this to tell the thread_breakpoint thread to exit. */ |
| volatile int break_out; |
| |
| static void * |
| thread_breakpoint (void *arg) |
| { |
| pthread_barrier_wait (&barrier); |
| |
| while (!break_out) |
| { |
| usleep (1); /* set break here */ |
| } |
| |
| return NULL; |
| } |
| |
| pthread_barrier_t barrier; |
| |
| int |
| main (void) |
| { |
| int i; |
| int ret; |
| pthread_t bp_thread; |
| |
| /* Don't run forever. */ |
| alarm (180); |
| |
| pthread_barrier_init (&barrier, NULL, NTHREADS + 1); |
| |
| /* Start the threads that constantly fork. */ |
| for (i = 0; i < NTHREADS; i++) |
| { |
| ret = pthread_create (&threads[i], NULL, thread_forks, NULL); |
| assert (ret == 0); |
| } |
| |
| /* Start the thread that constantly hit a conditional breakpoint |
| that needs to be stepped over. */ |
| ret = pthread_create (&bp_thread, NULL, thread_breakpoint, NULL); |
| assert (ret == 0); |
| |
| /* Wait for forking to stop. */ |
| for (i = 0; i < NTHREADS; i++) |
| { |
| ret = pthread_join (threads[i], NULL); |
| assert (ret == 0); |
| } |
| |
| break_out = 1; |
| pthread_join (bp_thread, NULL); |
| assert (ret == 0); |
| |
| return 0; |
| } |