--- /dev/null
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2015 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/>. */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+
+pthread_barrier_t barrier;
+
+#define NUM_THREADS 2
+
+void *
+thread_function (void *arg)
+{
+ /* This ensures that the breakpoint is only hit after both threads
+ are created, so the test can always switch to the non-event
+ thread when the breakpoint triggers. */
+ pthread_barrier_wait (&barrier);
+
+ while (1); /* break here */
+}
+
+int
+main (void)
+{
+ int i;
+
+ pthread_barrier_init (&barrier, NULL, NUM_THREADS);
+
+ for (i = 0; i < NUM_THREADS; i++)
+ {
+ pthread_t thread;
+ int res;
+
+ res = pthread_create (&thread, NULL,
+ thread_function, NULL);
+ assert (res == 0);
+ }
+
+ sleep (300);
+ return 0;
+}
--- /dev/null
+# Copyright (C) 2015 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/>.
+
+# This test exercises the case of stopping for a breakpoint hit of one
+# thread, then switching to a thread that has a status pending and
+# continuing.
+
+standard_testfile
+
+if [prepare_for_testing "failed to prepare" $testfile $srcfile {debug pthreads}] {
+ return -1
+}
+
+if ![runto_main] {
+ untested "could not run to main"
+ return -1
+}
+
+set break_line [gdb_get_line_number "break here"]
+
+# Return current thread's number.
+
+proc get_current_thread {} {
+ global gdb_prompt
+
+ set thread ""
+ set msg "get thread number"
+ gdb_test_multiple "print /x \$_thread" $msg {
+ -re "\\$\[0-9\]* = (0x\[0-9a-zA-Z\]+).*$gdb_prompt $" {
+ set thread $expect_out(1,string)
+ pass "$msg"
+ }
+ }
+ return ${thread}
+}
+
+# There are two threads in the program that are running the same tight
+# loop, where we place a breakpoint. Sometimes we'll get a breakpoint
+# trigger for thread 2, with the breakpoint event of thread 3 pending,
+# other times the opposite. The original bug that motivated this test
+# depended on the event thread being the highest numbered thread. We
+# try the same multiple times, which should cover both threads
+# reporting the event.
+
+set attempts 20
+
+for {set i 0} {$i < $attempts} {incr i} {
+ with_test_prefix "attempt $i" {
+ gdb_test "b $srcfile:$break_line" \
+ "Breakpoint .* at .*$srcfile, line $break_line.*" \
+ "set break in tight loop"
+ gdb_test "continue" \
+ "$srcfile:$break_line.*" \
+ "continue to tight loop"
+
+ # Switch to the thread that did _not_ report the event (and
+ # thus may have a pending status). At the time this test was
+ # written this was necessary to make linux-nat.c short-circuit
+ # the resume and go straight to consuming the pending event.
+ set thread [get_current_thread]
+ if {$thread == 2} {
+ set thread 3
+ } else {
+ set thread 2
+ }
+ gdb_test "thread $thread" \
+ "Switching to thread $thread .*" \
+ "switch to non-event thread"
+
+ # Delete all breakpoints so that continuing doesn't switch
+ # back to the event thread to do a step-over, which would mask
+ # away the original bug, which depended on the event thread
+ # still having TARGET_STOPPED_BY_SW_BREAKPOINT stop_reason.
+ delete_breakpoints
+
+ # In the original bug, continuing would trigger an internal
+ # error in the linux-nat.c backend.
+
+ set msg "continue for ctrl-c"
+ gdb_test_multiple "continue" $msg {
+ -re "Continuing" {
+ pass $msg
+ }
+ }
+
+ # Wait a bit for GDB to give the terminal to the inferior,
+ # otherwise ctrl-c too soon can result in a "Quit".
+ sleep 1
+ send_gdb "\003"
+
+ set msg "caught interrupt"
+ gdb_test_multiple "" $msg {
+ -re "Program received signal SIGINT.*$gdb_prompt $" {
+ pass $msg
+ }
+ }
+ }
+}
projects / binutils-gdb.git / commitdiff