| /* This testcase is part of GDB, the GNU debugger. |
| |
| Copyright 2009-2022 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/>. |
| |
| Check that hardware watchpoints get correctly replicated to all |
| existing threads when hardware watchpoints are created. This test |
| creates one hardware watchpoint per thread until a maximum is |
| reached. It originally addresses a deficiency seen on embedded |
| powerpc targets with slotted hardware *point designs. |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <pthread.h> |
| |
| #ifndef NR_THREADS |
| #define NR_THREADS 4 /* Set by the testcase. */ |
| #endif |
| |
| #ifndef X_INCR_COUNT |
| #define X_INCR_COUNT 10 /* Set by the testcase. */ |
| #endif |
| |
| void *thread_function (void *arg); /* Function executed by each thread. */ |
| |
| /* Used to hold threads back until wp-replication.exp is ready. */ |
| int test_ready = 0; |
| |
| /* Used to hold threads back until every thread has had a chance of causing |
| a watchpoint trigger. This prevents a situation in GDB where it may miss |
| watchpoint triggers when threads exit while other threads are causing |
| watchpoint triggers. */ |
| int can_terminate = 0; |
| |
| /* Number of watchpoints GDB is capable of using (this is provided |
| by GDB during the test run). */ |
| int hw_watch_count = 0; |
| |
| /* Array with elements we can create watchpoints for. */ |
| static int watched_data[NR_THREADS]; |
| pthread_mutex_t data_mutex; |
| |
| int |
| main () |
| { |
| int res; |
| pthread_t threads[NR_THREADS]; |
| int i; |
| |
| pthread_mutex_init (&data_mutex, NULL); |
| |
| for (i = 0; i < NR_THREADS; i++) |
| { |
| res = pthread_create (&threads[i], |
| NULL, thread_function, |
| (void *) (intptr_t) i); |
| if (res != 0) |
| { |
| fprintf (stderr, "error in thread %d create\n", i); |
| abort (); |
| } |
| } |
| |
| for (i = 0; i < NR_THREADS; ++i) |
| { |
| res = pthread_join (threads[i], NULL); |
| if (res != 0) |
| { |
| fprintf (stderr, "error in thread %d join\n", i); |
| abort (); |
| } |
| } |
| |
| exit (EXIT_SUCCESS); |
| } |
| |
| /* Easy place for a breakpoint. |
| wp-replication.exp uses this to track when all threads are running |
| instead of, for example, the program keeping track |
| because we don't need the program to know when all threads are running, |
| instead we need gdb to know when all threads are running. |
| There is a delay between when a thread has started and when the thread |
| has been registered with gdb. */ |
| |
| void |
| thread_started (void) |
| { |
| } |
| |
| void * |
| thread_function (void *arg) |
| { |
| int i, j; |
| long thread_number = (long) arg; |
| |
| thread_started (); |
| |
| /* Don't start incrementing X until wp-replication.exp is ready. */ |
| while (!test_ready) |
| usleep (1); |
| |
| pthread_mutex_lock (&data_mutex); |
| |
| for (i = 0; i < NR_TRIGGERS_PER_THREAD; i++) |
| { |
| for (j = 0; j < hw_watch_count; j++) |
| { |
| /* For debugging. */ |
| printf ("Thread %ld changing watch_thread[%d] data" |
| " from %d -> %d\n", thread_number, j, |
| watched_data[j], watched_data[j] + 1); |
| /* Increment the watched data field. */ |
| watched_data[j]++; |
| } |
| } |
| |
| pthread_mutex_unlock (&data_mutex); |
| |
| /* Hold the threads here to work around a problem GDB has evaluating |
| watchpoints right when a DSO event shows up (PR breakpoints/10116). |
| Sleep a little longer (than, say, 1, 5 or 10) to avoid consuming |
| lots of cycles while the other threads are trying to execute the |
| loop. */ |
| while (!can_terminate) |
| usleep (100); |
| |
| pthread_exit (NULL); |
| } |