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Introduce run_on_main_thread

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This introduces a way for a callback to be run on the main thread.

gdb/ChangeLog
2019-11-26  Tom Tromey  <tom@tromey.com>

	* run-on-main-thread.c: New file.
	* run-on-main-thread.h: New file.
	* unittests/main-thread-selftests.c: New file.
	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
	main-thread-selftests.c.
	(HFILES_NO_SRCDIR): Add run-on-main-thread.h.
	(COMMON_SFILES): Add run-on-main-thread.c.

Change-Id: I16ef82f0564e9f8a524bdc64cb31df79a988ad9f
This commit is contained in:
Tom Tromey 2019-03-08 15:51:06 -07:00
parent c3efb96548
commit 9411c49ecc
5 changed files with 218 additions and 0 deletions
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80
gdb/unittests/main-thread-selftests.c Normal file
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/* Self tests for run_on_main_thread
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of GDB.
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 "defs.h"
#include "gdbsupport/selftest.h"
#include "gdbsupport/block-signals.h"
#include "run-on-main-thread.h"
#include "event-loop.h"
#if CXX_STD_THREAD
#include <thread>
#endif
namespace selftests {
namespace main_thread_tests {
#if CXX_STD_THREAD
static bool done;
static void
set_done ()
{
run_on_main_thread ([] ()
{
done = true;
});
}
static void
run_tests ()
{
std::thread thread;
done = false;
{
gdb::block_signals blocker;
thread = std::thread (set_done);
}
while (!done && gdb_do_one_event () >= 0)
;
/* Actually the test will just hang, but we want to test
something. */
SELF_CHECK (done);
thread.join ();
}
#endif
}
}
void
_initialize_main_thread_selftests ()
{
#if CXX_STD_THREAD
selftests::register_test ("run_on_main_thread",
selftests::main_thread_tests::run_tests);
#endif
}