step-over-lands-on-breakpoint.c revision 1.7
1/* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2014-2020 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18#include <pthread.h> 19#include <unistd.h> 20#include <stdlib.h> 21 22pthread_barrier_t barrier; 23pthread_t child_thread; 24 25volatile unsigned int counter = 1; 26 27void * 28child_function (void *arg) 29{ 30 pthread_barrier_wait (&barrier); 31 32 while (counter > 0) 33 { 34 counter++; 35 36 asm (" nop"); /* set breakpoint child here */ 37 asm (" nop"); /* set breakpoint after step-over here */ 38 usleep (1); 39 } 40 41 pthread_exit (NULL); 42} 43 44int 45main () 46{ 47 int res; 48 long i; 49 50 alarm (300); 51 52 pthread_barrier_init (&barrier, NULL, 2); 53 54 res = pthread_create (&child_thread, NULL, child_function, NULL); 55 pthread_barrier_wait (&barrier); 56 57 /* Use an infinite loop with no function calls so that "step" over 58 this line never finishes before the breakpoint in the other 59 thread triggers. That can happen if the step-over of thread 2 is 60 done with displaced stepping on a target that is always in 61 non-stop mode, as in that case GDB runs both threads 62 simultaneously. */ 63 while (1); /* set wait-thread breakpoint here */ 64 65 pthread_join (child_thread, NULL); 66 67 exit (EXIT_SUCCESS); 68} 69