| /* This testcase is part of GDB, the GNU debugger. |
| |
| Copyright 2015-2017 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 <unistd.h> |
| #include "trace-common.h" |
| |
| /* Called if the testcase failed. */ |
| static void |
| fail (void) |
| { |
| } |
| |
| static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
| |
| /* This function overrides gdb_collect in the in-process agent library. |
| See gdbserver/tracepoint.c (gdb_collect). We want this function to |
| be ran instead of the one from the library to easily check that only |
| one thread is tracing at a time. |
| |
| This works as expected because GDBserver will ask GDB about symbols |
| present in the inferior with the 'qSymbol' packet. And GDB will |
| reply with the address of this function instead of the one from the |
| in-process agent library. */ |
| |
| void |
| gdb_agent_gdb_collect (void *tpoint, unsigned char *regs) |
| { |
| /* If we cannot acquire a lock, then this means another thread is |
| tracing and the lock implemented by the jump pad is not working! */ |
| if (pthread_mutex_trylock (&mutex) != 0) |
| { |
| fail (); |
| return; |
| } |
| |
| sleep (1); |
| |
| if (pthread_mutex_unlock (&mutex) != 0) |
| { |
| fail (); |
| return; |
| } |
| } |
| |
| static void * |
| thread_function (void *arg) |
| { |
| FAST_TRACEPOINT_LABEL(set_point); |
| } |
| |
| static void |
| end (void) |
| { |
| } |
| |
| int |
| main (int argc, char *argv[], char *envp[]) |
| { |
| pthread_t threads[NUM_THREADS]; |
| int i; |
| |
| for (i = 0; i < NUM_THREADS; i++) |
| pthread_create (&threads[i], NULL, thread_function, NULL); |
| |
| for (i = 0; i < NUM_THREADS; i++) |
| pthread_join (threads[i], NULL); |
| |
| end (); |
| |
| return 0; |
| } |