112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2021-2022 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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#define _GNU_SOURCE
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#include <assert.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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/* Number of threads we'll create. */
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int n_threads = 10;
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int mypid;
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static void
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setup_done (void)
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{
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}
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/* Entry point for threads. Loops forever. */
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void *
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thread_func (void *arg)
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{
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/* Avoid setting the breakpoint at an instruction that wouldn't
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require a fixup phase, like a branch/jump. In such a case, even
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if GDB manages to detach the inferior with an incomplete
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displaced step, GDB inferior may still not crash. A breakpoint
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at a line that increments a variable is good bet that we end up
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setting a breakpoint at an instruction that will require a fixup
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phase to move the PC from the scratch pad to the instruction
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after the breakpoint. */
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volatile unsigned counter = 0;
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while (1)
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{
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counter++; /* Set breakpoint here. */
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counter++;
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counter++;
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}
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return NULL;
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}
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/* Allow for as much timeout as DejaGnu wants, plus a bit of
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slack. */
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#define SECONDS (TIMEOUT + 20)
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/* We'll exit after this many seconds. */
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unsigned int seconds_left = SECONDS;
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/* GDB sets this whenever it's about to start a new detach/attach
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sequence. We react by resetting the seconds-left counter. */
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volatile int again = 0;
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int
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main (int argc, char **argv)
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{
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int i;
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signal (SIGUSR1, SIG_IGN);
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mypid = getpid ();
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setup_done ();
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if (argc > 1)
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n_threads = atoi (argv[1]);
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/* Spawn the test threads. */
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for (i = 0; i < n_threads; ++i)
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{
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pthread_t child;
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int rc;
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rc = pthread_create (&child, NULL, thread_func, NULL);
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assert (rc == 0);
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}
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/* Exit after a while if GDB is gone/crashes. But wait long enough
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for one attach/detach sequence done by the .exp file. */
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while (--seconds_left > 0)
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{
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sleep (1);
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if (again)
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{
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/* GDB should be reattaching soon. Restart the timer. */
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again = 0;
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seconds_left = SECONDS;
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}
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}
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printf ("timeout, exiting\n");
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return 0;
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}
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