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LibCore: Big first step towards pluggable Core::EventLoop

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The EventLoop is now a wrapper around an EventLoopImplementation.
Our old EventLoop code has moved into EventLoopImplementationUnix and
continues to work as before.

The main difference is that all the separate thread_local variables have
been collected into a file-local ThreadData data structure.

The goal here is to allow running Core::EventLoop with a totally
different backend, such as Qt for Ladybird.
This commit is contained in:
Andreas Kling 2023-04-24 12:25:14 +02:00
parent 3de8dd921e
commit 16c47ccff6
11 changed files with 718 additions and 562 deletions
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19
Userland/Libraries/LibCore/EventLoop.h
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@ -18,6 +18,8 @@
namespace Core {
class EventLoopImplementation;
// The event loop enables asynchronous (not parallel or multi-threaded) computing by efficiently handling events from various sources.
// Event loops are most important for GUI programs, where the various GUI updates and action callbacks run on the EventLoop,
// as well as services, where asynchronous remote procedure calls of multiple clients are handled.
@ -48,9 +50,6 @@ public:
EventLoop();
~EventLoop();
static void initialize_wake_pipes();
static bool has_been_instantiated();
// Pump the event loop until its exit is requested.
int exec();
@ -73,7 +72,7 @@ public:
void quit(int);
void unquit();
bool was_exit_requested() const { return m_exit_requested; }
bool was_exit_requested() const;
// The registration functions act upon the current loop of the current thread.
static int register_timer(Object&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
@ -102,17 +101,7 @@ private:
static pid_t s_pid;
bool m_exit_requested { false };
int m_exit_code { 0 };
static thread_local int s_wake_pipe_fds[2];
static thread_local bool s_wake_pipe_initialized;
// The wake pipe of this event loop needs to be accessible from other threads.
int (*m_wake_pipe_fds)[2];
struct Private;
NonnullOwnPtr<Private> m_private;
NonnullOwnPtr<EventLoopImplementation> m_impl;
};
void deferred_invoke(Function<void()>);