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LibCore: Allow event loops on other threads to wake up

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Because the wake pipe is thread-local, it was previously not possible
to wake an event loop across a thread. Therefore, this commit
rearchitects event loop waking by making the wake function a member of
the event loop itself and having it keep a pointer to its thread's wake
pipe. The global wake() function calls wake on the current thread's
event loop.

This also fixes a bug in BackgroundAction: it should wake the event loop
it was created on, instead of the current thread's event loop.
This commit is contained in:
kleines Filmröllchen 2022-02-11 16:57:10 +01:00 • committed by Andreas Kling
parent 716a3429fa
commit 704bb361bb
4 changed files with 27 additions and 9 deletions
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13
Userland/Libraries/LibCore/EventLoop.h
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@ -34,6 +34,11 @@ public:
Yes,
};
enum class ShouldWake {
No,
Yes
};
explicit EventLoop(MakeInspectable = MakeInspectable::No);
~EventLoop();
static void initialize_wake_pipes();
@ -51,7 +56,7 @@ public:
void spin_until(Function<bool()>);
void post_event(Object& receiver, NonnullOwnPtr<Event>&&);
void post_event(Object& receiver, NonnullOwnPtr<Event>&&, ShouldWake = ShouldWake::No);
template<typename Callback>
static decltype(auto) with_main_locked(Callback callback)
@ -79,7 +84,8 @@ public:
m_queued_events.extend(move(other.m_queued_events));
}
static void wake();
static void wake_current();
void wake();
static int register_signal(int signo, Function<void(int)> handler);
static void unregister_signal(int handler_id);
@ -126,6 +132,9 @@ private:
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;
};