* gdb.threads/watchthreads2.exp: New testcase.
* gdb.threads/watchthreads2.c: New testcase.
This commit is contained in:
Doug Evans
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2009-04-30 Doug Evans <dje@google.com>
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* gdb.threads/watchthreads2.exp: New testcase.
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* gdb.threads/watchthreads2.c: New testcase.
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2009-04-29 Doug Evans <dje@google.com>
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* gdb.cp/mb-ctor.exp: Add multi-line source statement test.
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2009 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 watchpoints get propagated to all existing threads when the
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watchpoint is created.
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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
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#endif
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#ifndef X_INCR_COUNT
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#define X_INCR_COUNT 10
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#endif
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void *thread_function (void *arg); /* Function executed by each thread. */
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pthread_mutex_t x_mutex;
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int x;
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/* Used to hold threads back until watchthreads2.exp is ready. */
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int test_ready = 0;
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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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pthread_mutex_init (&x_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,
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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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watchthreads2.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 ()
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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;
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thread_started ();
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/* Don't start incrementing X until watchthreads2.exp is ready. */
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while (! test_ready)
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usleep (1);
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for (i = 0; i < X_INCR_COUNT; ++i)
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{
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pthread_mutex_lock (&x_mutex);
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/* For debugging. */
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printf ("Thread %ld changing x %d -> %d\n", (long) arg, x, x + 1);
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/* The call to usleep is so that when the watchpoint triggers,
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the pc is still on the same line. */
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++x; usleep (1); /* X increment. */
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pthread_mutex_unlock (&x_mutex);
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}
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pthread_exit (NULL);
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}
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@ -0,0 +1,139 @@
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# This testcase is part of GDB, the GNU debugger.
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# Copyright 2009 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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#
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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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#
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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 watchpoints get propagated to all existing threads when the
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# watchpoint is created.
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set NR_THREADS 4
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set X_INCR_COUNT 10
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if $tracelevel {
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strace $tracelevel
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}
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set prms_id 0
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set bug_id 0
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# This test verifies that a watchpoint is detected in the proper thread
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# so the test is only meaningful on a system with hardware watchpoints.
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if [target_info exists gdb,no_hardware_watchpoints] {
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return 0;
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}
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set testfile "watchthreads2"
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set srcfile ${testfile}.c
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set binfile ${objdir}/${subdir}/${testfile}
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "incdir=${objdir}" "additional_flags=-DNR_THREADS=$NR_THREADS -DX_INCR_COUNT=$X_INCR_COUNT"]] != "" } {
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return -1
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}
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gdb_exit
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gdb_start
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gdb_reinitialize_dir $srcdir/$subdir
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gdb_load ${binfile}
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gdb_test "set can-use-hw-watchpoints 1" "" ""
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#
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# Run to `main' where we begin our tests.
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#
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if ![runto_main] then {
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gdb_suppress_tests
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}
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gdb_test "break thread_started" \
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"Breakpoint 2 at .*: file .*${srcfile}, line .*" \
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"breakpoint on thread_started"
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# Run the program until all threads have hit thread_started.
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# We use this as the vehicle to determine when gdb is aware
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# of all threads (i.e. "info threads" would show all threads).
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set nr_started 0
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set message "run to thread_started"
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for { set i 0 } { $i < $NR_THREADS } { incr i } {
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gdb_test_multiple "continue" $message {
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-re ".*Breakpoint 2, thread_started ().*$gdb_prompt $" {
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incr nr_started
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}
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timeout {
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set i $NR_THREADS
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}
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}
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}
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if { $nr_started == $NR_THREADS } {
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pass "all threads started"
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} else {
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fail "all threads started"
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# No point in continuing.
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return -1
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}
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# Watch X, it will be modified by all threads.
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# We want this watchpoint to be set *after* all threads are running.
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gdb_test "watch x" "Hardware watchpoint 3: x"
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# Now that the watchpoint is set, we can let the threads increment X.
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gdb_test "set var test_ready = 1" ""
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# While debugging.
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#gdb_test "set debug infrun 1" ""
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set x_inc_line [gdb_get_line_number "X increment"]
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set x_thread_loc "thread_function \\\(arg=.*\\\) at .*watchthreads.c:$x_inc_line"
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# X is incremented under a mutex, so we should get NR_THREADS * X_INCR_COUNT
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# hits.
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set limit [expr $NR_THREADS*$X_INCR_COUNT]
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set x_count 0
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set done 0
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set message "x watch loop"
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for {set i 0} {!$done && $i < $limit} {incr i} {
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set test_flag 0
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gdb_test_multiple "continue" $message {
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-re "(.*Hardware watchpoint.*)$gdb_prompt $" {
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set string $expect_out(1,string)
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if [regexp "Hardware watchpoint 3: x\[^\r\]*\r\[^\r\]*\r\[^\r\]*Old value = $x_count\[^\r\]*\r\[^\r\]*New value = [expr $x_count+1]\r" $string] {
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incr x_count
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set test_flag 1
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} else {
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# We test for new value = old value + 1 each iteration.
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# This can fail due to gdb/10116.
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# This is caught after the loop exits.
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}
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}
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-re "The program is not being run.*$gdb_prompt $" {
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fail "$message (program terminated)"
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}
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}
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# If we fail above, don't bother continuing loop.
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if { $test_flag == 0 } {
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set done 1
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}
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}
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if { $i == $limit } {
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pass "all threads incremented x"
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} else {
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kfail "gdb/10116" "gdb can drop watchpoints in multithreaded app"
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}
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