Introduce run_on_main_thread
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
parent
c3efb96548
commit
9411c49ecc
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@ -1,3 +1,13 @@
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2019-11-26 Tom Tromey <tom@tromey.com>
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* run-on-main-thread.c: New file.
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* run-on-main-thread.h: New file.
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* unittests/main-thread-selftests.c: New file.
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* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
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main-thread-selftests.c.
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(HFILES_NO_SRCDIR): Add run-on-main-thread.h.
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(COMMON_SFILES): Add run-on-main-thread.c.
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2019-11-26 Tom Tromey <tom@tromey.com>
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* main.c (setup_alternate_signal_stack): Remove.
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@ -433,6 +433,7 @@ SUBDIR_UNITTESTS_SRCS = \
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unittests/optional-selftests.c \
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unittests/parse-connection-spec-selftests.c \
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unittests/ptid-selftests.c \
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unittests/main-thread-selftests.c \
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unittests/mkdir-recursive-selftests.c \
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unittests/rsp-low-selftests.c \
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unittests/scoped_fd-selftests.c \
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@ -1116,6 +1117,7 @@ COMMON_SFILES = \
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remote-fileio.c \
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remote-notif.c \
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reverse.c \
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run-on-main-thread.c \
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rust-lang.c \
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sentinel-frame.c \
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ser-event.c \
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@ -1378,6 +1380,7 @@ HFILES_NO_SRCDIR = \
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riscv-tdep.h \
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rs6000-aix-tdep.h \
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rs6000-tdep.h \
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run-on-main-thread.h \
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s390-linux-tdep.h \
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s390-tdep.h \
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score-tdep.h \
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@ -0,0 +1,97 @@
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/* Run a function on the main thread
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GDB.
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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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#include "defs.h"
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#include "run-on-main-thread.h"
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#include "ser-event.h"
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#if CXX_STD_THREAD
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#include <mutex>
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#endif
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#include "event-loop.h"
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/* The serial event used when posting runnables. */
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static struct serial_event *runnable_event;
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/* Runnables that have been posted. */
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static std::vector<std::function<void ()>> runnables;
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#if CXX_STD_THREAD
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/* Mutex to hold when handling RUNNABLE_EVENT or RUNNABLES. */
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static std::mutex runnable_mutex;
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#endif
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/* Run all the queued runnables. */
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static void
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run_events (int error, gdb_client_data client_data)
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{
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std::vector<std::function<void ()>> local;
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/* Hold the lock while changing the globals, but not while running
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the runnables. */
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{
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#if CXX_STD_THREAD
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std::lock_guard<std::mutex> lock (runnable_mutex);
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#endif
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/* Clear the event fd. Do this before flushing the events list,
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so that any new event post afterwards is sure to re-awaken the
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event loop. */
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serial_event_clear (runnable_event);
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/* Move the vector in case running a runnable pushes a new
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runnable. */
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local = std::move (runnables);
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}
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for (auto &item : local)
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{
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try
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{
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item ();
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}
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catch (...)
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{
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/* Ignore exceptions in the callback. */
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}
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}
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}
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/* See run-on-main-thread.h. */
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void
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run_on_main_thread (std::function<void ()> &&func)
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{
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#if CXX_STD_THREAD
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std::lock_guard<std::mutex> lock (runnable_mutex);
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#endif
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runnables.emplace_back (std::move (func));
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serial_event_set (runnable_event);
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}
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void
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_initialize_run_on_main_thread ()
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{
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runnable_event = make_serial_event ();
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add_file_handler (serial_event_fd (runnable_event), run_events, nullptr);
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}
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@ -0,0 +1,28 @@
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/* Run a function on the main thread
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GDB.
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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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#ifndef GDB_RUN_ON_MAIN_THREAD_H
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#define GDB_RUN_ON_MAIN_THREAD_H
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#include <functional>
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/* Send a runnable to the main thread. */
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extern void run_on_main_thread (std::function<void ()> &&);
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#endif /* GDB_RUN_ON_MAIN_THREAD_H */
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@ -0,0 +1,80 @@
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/* Self tests for run_on_main_thread
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GDB.
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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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#include "defs.h"
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#include "gdbsupport/selftest.h"
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#include "gdbsupport/block-signals.h"
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#include "run-on-main-thread.h"
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#include "event-loop.h"
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#if CXX_STD_THREAD
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#include <thread>
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#endif
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namespace selftests {
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namespace main_thread_tests {
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#if CXX_STD_THREAD
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static bool done;
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static void
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set_done ()
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{
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run_on_main_thread ([] ()
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{
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done = true;
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});
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}
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static void
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run_tests ()
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{
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std::thread thread;
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done = false;
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{
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gdb::block_signals blocker;
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thread = std::thread (set_done);
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}
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while (!done && gdb_do_one_event () >= 0)
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;
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/* Actually the test will just hang, but we want to test
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something. */
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SELF_CHECK (done);
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thread.join ();
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}
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#endif
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}
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}
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void
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_initialize_main_thread_selftests ()
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{
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#if CXX_STD_THREAD
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selftests::register_test ("run_on_main_thread",
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selftests::main_thread_tests::run_tests);
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#endif
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}
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