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4a94e36819
This commit brings all the changes made by running gdb/copyright.py as per GDB's Start of New Year Procedure. For the avoidance of doubt, all changes in this commits were performed by the script.
91 lines
2.8 KiB
Plaintext
91 lines
2.8 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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#
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# Copyright 2013-2022 Free Software Foundation, Inc.
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#
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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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# Regression test for a bug that would go like this:
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#
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# - Run to a breakpoint that is hit by two threads (A and B)
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# simultaneously.
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#
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# - One of the breakpoint hits is processed (e.g., thread A) and
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# causes a user-visible stop. The other (thread B) is left pending.
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#
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# - The user deletes the breakpoint with "del", which causes a
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# confirmation query.
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#
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# - By mistake, that would result in the target being left with async
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# enabled, even though it wasn't to begin with.
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#
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# - GDB reacts to target async enablement by polling for target
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# events. As no thread is resumed the target replies
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# TARGET_WAITKIND_NO_RESUMED.
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#
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# - The user continues the program, expecting it to exit. The thread
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# that has an event pending (thread B) is not really resumed.
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#
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# - But, nothing signals the event loop that there's a pending event
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# waiting to be collected for thread B, so that event is never
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# processed, thread B is never resumed and the program never exits.
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#
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# Ref: https://sourceware.org/ml/gdb-patches/2015-01/msg00592.html
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standard_testfile
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if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug pthreads}] == -1} {
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return -1
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}
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proc test {} {
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global srcfile gdb_prompt
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if ![runto_main] {
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return -1
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}
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delete_breakpoints
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set bp_line [gdb_get_line_number "set break here" $srcfile]
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gdb_breakpoint "break_function"
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gdb_continue_to_breakpoint "cont to break_function" ".*$srcfile:$bp_line\r\n.*"
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# Do something that causes a query/secondary prompt.
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set test "delete breakpoints, answer prompt"
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set saw_prompt 0
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gdb_test_multiple "delete breakpoints" $test {
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-re "Delete all breakpoints.*y or n.*$" {
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set saw_prompt 1
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send_gdb "y\n"
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exp_continue
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}
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-re "$gdb_prompt $" {
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gdb_assert $saw_prompt $test
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}
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}
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gdb_continue_to_end "" "continue" 1
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}
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# Test a few times to make sure an event is left pending. At the time
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# of writing, the bug always triggers, but that might naturally depend
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# on machine.
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for {set i 1} {$i <= 10} {incr i} {
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with_test_prefix "iter $i" {
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test
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}
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}
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