168 lines
4.5 KiB
C
168 lines
4.5 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009-2013 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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Check that hardware watchpoints get correctly replicated to all
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existing threads when hardware watchpoints are created. This test
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creates one hardware watchpoint per thread until a maximum is
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reached. It originally addresses a deficiency seen on embedded
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powerpc targets with slotted hardware *point designs.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <pthread.h>
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#ifndef NR_THREADS
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#define NR_THREADS 4 /* Set by the testcase. */
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#endif
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#ifndef X_INCR_COUNT
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#define X_INCR_COUNT 10 /* Set by the testcase. */
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#endif
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void *thread_function (void *arg); /* Function executed by each thread. */
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/* Used to hold threads back until wp-replication.exp is ready. */
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int test_ready = 0;
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/* Used to hold threads back until every thread has had a chance of causing
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a watchpoint trigger. This prevents a situation in GDB where it may miss
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watchpoint triggers when threads exit while other threads are causing
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watchpoint triggers. */
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int can_terminate = 0;
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/* Used to push the program out of the waiting loop after the
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testcase is done counting the number of hardware watchpoints
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available for our target. */
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int watch_count_done = 0;
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/* Number of watchpoints GDB is capable of using (this is provided
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by GDB during the test run). */
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int hw_watch_count = 0;
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/* Array with elements we can create watchpoints for. */
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static int watched_data[NR_THREADS];
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pthread_mutex_t data_mutex;
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/* Wait function to keep threads busy while the testcase does
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what it needs to do. */
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void
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empty_cycle (void)
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{
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usleep (1);
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}
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int
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main ()
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{
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int res;
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pthread_t threads[NR_THREADS];
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int i;
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/* Something to ensure that the breakpoint used to run to main
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is only hit once. */
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empty_cycle ();
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while (watch_count_done == 0)
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{
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/* GDB will modify the value of "watch_count_done" at runtime and we
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will get past this point. */
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empty_cycle ();
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}
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pthread_mutex_init (&data_mutex, NULL);
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for (i = 0; i < NR_THREADS; i++)
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{
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res = pthread_create (&threads[i],
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NULL, thread_function,
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(void *) (intptr_t) i);
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if (res != 0)
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{
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fprintf (stderr, "error in thread %d create\n", i);
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abort ();
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}
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}
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for (i = 0; i < NR_THREADS; ++i)
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{
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res = pthread_join (threads[i], NULL);
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if (res != 0)
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{
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fprintf (stderr, "error in thread %d join\n", i);
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abort ();
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}
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}
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exit (EXIT_SUCCESS);
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}
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/* Easy place for a breakpoint.
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wp-replication.exp uses this to track when all threads are running
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instead of, for example, the program keeping track
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because we don't need the program to know when all threads are running,
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instead we need gdb to know when all threads are running.
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There is a delay between when a thread has started and when the thread
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has been registered with gdb. */
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void
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thread_started (void)
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{
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}
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void *
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thread_function (void *arg)
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{
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int i, j;
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long thread_number = (long) arg;
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thread_started ();
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/* Don't start incrementing X until wp-replication.exp is ready. */
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while (!test_ready)
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usleep (1);
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pthread_mutex_lock (&data_mutex);
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for (i = 0; i < NR_TRIGGERS_PER_THREAD; i++)
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{
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for (j = 0; j < hw_watch_count; j++)
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{
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/* For debugging. */
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printf ("Thread %ld changing watch_thread[%d] data"
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" from %d -> %d\n", thread_number, j,
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watched_data[j], watched_data[j] + 1);
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/* Increment the watched data field. */
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watched_data[j]++;
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}
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}
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pthread_mutex_unlock (&data_mutex);
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/* Hold the threads here to work around a problem GDB has evaluating
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watchpoints right when a DSO event shows up (PR breakpoints/10116).
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Sleep a little longer (than, say, 1, 5 or 10) to avoid consuming
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lots of cycles while the other threads are trying to execute the
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loop. */
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while (!can_terminate)
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usleep (100);
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pthread_exit (NULL);
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}
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