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CEventLoop: Protect the message queue with a Lock.

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This commit is contained in:
Andreas Kling 2019-04-29 15:57:49 +02:00
parent 14ac77131b
commit 65f2f19b41
Notes: sideshowbarker 2024-07-19 14:32:35 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/65f2f19b41f
2 changed files with 21 additions and 3 deletions
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21
LibCore/CEventLoop.cpp
View file

@ -1,6 +1,7 @@
#include <LibCore/CObject.h>
#include <LibCore/CEventLoop.h>
#include <LibCore/CEvent.h>
#include <LibCore/CLock.h>
#include <LibCore/CNotifier.h>
#include <LibC/unistd.h>
#include <LibC/stdio.h>
@ -91,11 +92,17 @@ int CEventLoop::exec()
if (m_exit_requested)
return m_exit_code;
do_processing();
if (m_queued_events.is_empty()) {
wait_for_event();
do_processing();
}
auto events = move(m_queued_events);
decltype(m_queued_events) events;
{
LOCKER(m_lock);
events = move(m_queued_events);
}
for (auto& queued_event : events) {
auto* receiver = queued_event.receiver.ptr();
auto& event = *queued_event.event;
@ -120,6 +127,7 @@ int CEventLoop::exec()
}
if (m_exit_requested) {
LOCKER(m_lock);
auto rejigged_event_queue = move(events);
rejigged_event_queue.append(move(m_queued_events));
m_queued_events = move(rejigged_event_queue);
@ -132,6 +140,7 @@ int CEventLoop::exec()
void CEventLoop::post_event(CObject& receiver, OwnPtr<CEvent>&& event)
{
LOCKER(m_lock);
#ifdef CEVENTLOOP_DEBUG
dbgprintf("CEventLoop::post_event: {%u} << receiver=%p, event=%p\n", m_queued_events.size(), &receiver, event.ptr());
#endif
@ -164,11 +173,17 @@ void CEventLoop::wait_for_event()
ASSERT_NOT_REACHED();
}
bool queued_events_is_empty;
{
LOCKER(m_lock);
queued_events_is_empty = m_queued_events.is_empty();
}
struct timeval timeout = { 0, 0 };
if (!s_timers->is_empty() && m_queued_events.is_empty())
if (!s_timers->is_empty() && queued_events_is_empty)
get_next_timer_expiration(timeout);
int rc = select(max_fd + 1, &rfds, &wfds, nullptr, (m_queued_events.is_empty() && s_timers->is_empty()) ? nullptr : &timeout);
int rc = select(max_fd + 1, &rfds, &wfds, nullptr, (queued_events_is_empty && s_timers->is_empty()) ? nullptr : &timeout);
if (rc < 0) {
ASSERT_NOT_REACHED();
}

3
LibCore/CEventLoop.h
View file

@ -1,5 +1,6 @@
#pragma once
#include <LibCore/CLock.h>
#include <AK/Badge.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
@ -58,6 +59,8 @@ private:
bool m_exit_requested { false };
int m_exit_code { 0 };
CLock m_lock;
struct EventLoopTimer {
int timer_id { 0 };
int interval { 0 };