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https://sourceware.org/git/binutils-gdb.git
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47ccd6b84b
Pedro pointed out that gdb worker threads should not react to quits. While I don't think that the new DWARF reader can call QUIT from a worker thread (and I don't think the existing minsym threading code can either), it seems safest to address this before checking in the new code. This patch arranges for the QUIT macro to only work on the main thread.
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/* Run a function on the main thread
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Copyright (C) 2019-2022 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 <thread>
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#include <mutex>
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#endif
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#include "gdbsupport/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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/* The main thread. */
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static std::thread::id main_thread;
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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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/* See run-on-main-thread.h. */
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bool
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is_main_thread ()
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{
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#if CXX_STD_THREAD
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return std::this_thread::get_id () == main_thread;
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#else
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return true;
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#endif
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}
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void _initialize_run_on_main_thread ();
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void
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_initialize_run_on_main_thread ()
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{
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#if CXX_STD_THREAD
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main_thread = std::this_thread::get_id ();
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#endif
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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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"run-on-main-thread");
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}
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