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https://github.com/FliegendeWurst/cursive.git
synced 2024-11-10 03:10:41 +00:00
Move resize thread handling to separate module
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f4530d688b
commit
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@ -305,7 +305,7 @@ impl backend::Backend for Backend {
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) {
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let running = Arc::new(AtomicBool::new(true));
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backend::start_resize_thread(
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backend::resize::start_resize_thread(
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self.signals.take().unwrap(),
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event_sink.clone(),
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input_request.clone(),
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@ -457,7 +457,7 @@ impl backend::Backend for Backend {
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#[cfg(unix)]
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{
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backend::start_resize_thread(
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backend::resize::start_resize_thread(
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self.signals.take().unwrap(),
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event_sink.clone(),
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input_request.clone(),
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@ -7,19 +7,15 @@
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//! using some common libraries. Each of those included backends needs a
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//! corresonding feature to be enabled.
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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use std::thread;
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use crossbeam_channel::{Receiver, Sender};
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#[cfg(unix)]
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use signal_hook::iterator::Signals;
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use event::Event;
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use theme;
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use vec::Vec2;
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#[cfg(unix)]
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mod resize;
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pub mod dummy;
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pub mod blt;
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@ -91,49 +87,3 @@ pub trait Backend {
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/// Disables the given effect.
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fn unset_effect(&self, effect: theme::Effect);
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}
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/// This starts a new thread to listen for SIGWINCH signals
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///
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/// As long as `resize_running` is true, it will listen for SIGWINCH, and,
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/// when detected, it wil set `needs_resize` to true and send an event to
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/// `resize_sender`. It will also consume an event from `resize_requests`
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/// afterward, to keep the balance in the force.
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#[cfg(unix)]
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fn start_resize_thread(
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signals: Signals, resize_sender: Sender<Option<Event>>,
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resize_requests: Receiver<InputRequest>, resize_running: Arc<AtomicBool>,
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needs_resize: Option<Arc<AtomicBool>>,
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) {
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thread::spawn(move || {
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// This thread will listen to SIGWINCH events and report them.
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while resize_running.load(Ordering::Relaxed) {
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// We know it will only contain SIGWINCH signals, so no need to check.
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if signals.wait().count() > 0 {
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// Tell ncurses about the new terminal size.
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// Well, do the actual resizing later on, in the main thread.
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// Ncurses isn't really thread-safe so calling resize_term() can crash
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// other calls like clear() or refresh().
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if let Some(ref needs_resize) = needs_resize {
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needs_resize.store(true, Ordering::Relaxed);
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}
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resize_sender.send(Some(Event::WindowResize));
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// We've sent the message.
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// This means Cursive was listening, and will now soon be sending a new request.
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// This means the input thread accepted a request, but hasn't sent a message yet.
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// So we KNOW the input thread is not waiting for a new request.
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// We sent an event for free, so pay for it now by consuming a request
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while let Some(InputRequest::Peek) = resize_requests.recv() {
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// At this point Cursive will now listen for input.
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// There is a chance the input thread will send his event before us.
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// But without some extra atomic flag, it'd be hard to know.
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// So instead, keep sending `None`
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// Repeat until we receive a blocking call
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resize_sender.send(None);
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}
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}
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}
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});
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}
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55
src/backend/resize.rs
Normal file
55
src/backend/resize.rs
Normal file
@ -0,0 +1,55 @@
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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use std::thread;
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use crossbeam_channel::{Receiver, Sender};
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use signal_hook::iterator::Signals;
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use backend::InputRequest;
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use event::Event;
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/// This starts a new thread to listen for SIGWINCH signals
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///
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/// As long as `resize_running` is true, it will listen for SIGWINCH, and,
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/// when detected, it wil set `needs_resize` to true and send an event to
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/// `resize_sender`. It will also consume an event from `resize_requests`
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/// afterward, to keep the balance in the force.
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#[cfg(unix)]
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pub fn start_resize_thread(
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signals: Signals, resize_sender: Sender<Option<Event>>,
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resize_requests: Receiver<InputRequest>, resize_running: Arc<AtomicBool>,
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needs_resize: Option<Arc<AtomicBool>>,
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) {
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thread::spawn(move || {
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// This thread will listen to SIGWINCH events and report them.
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while resize_running.load(Ordering::Relaxed) {
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// We know it will only contain SIGWINCH signals, so no need to check.
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if signals.wait().count() > 0 {
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// Tell ncurses about the new terminal size.
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// Well, do the actual resizing later on, in the main thread.
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// Ncurses isn't really thread-safe so calling resize_term() can crash
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// other calls like clear() or refresh().
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if let Some(ref needs_resize) = needs_resize {
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needs_resize.store(true, Ordering::Relaxed);
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}
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resize_sender.send(Some(Event::WindowResize));
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// We've sent the message.
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// This means Cursive was listening, and will now soon be sending a new request.
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// This means the input thread accepted a request, but hasn't sent a message yet.
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// So we KNOW the input thread is not waiting for a new request.
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// We sent an event for free, so pay for it now by consuming a request
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while let Some(InputRequest::Peek) = resize_requests.recv() {
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// At this point Cursive will now listen for input.
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// There is a chance the input thread will send his event before us.
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// But without some extra atomic flag, it'd be hard to know.
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// So instead, keep sending `None`
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// Repeat until we receive a blocking call
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resize_sender.send(None);
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}
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}
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}
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});
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}
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@ -298,7 +298,7 @@ impl backend::Backend for Backend {
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#[cfg(unix)]
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{
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backend::start_resize_thread(
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backend::resize::start_resize_thread(
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Signals::new(&[libc::SIGWINCH]).unwrap(),
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event_sink.clone(),
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input_request.clone(),
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