From 709879ee56d31fe543a0ad882713bd4e3d17d2d2 Mon Sep 17 00:00:00 2001
From: dam <dam@gudinoff>
Date: Thu, 17 Aug 2023 20:28:47 +0100
Subject: Added kscurses and testing program.

---
 kscurses/events.jai | 256 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 256 insertions(+)
 create mode 100644 kscurses/events.jai

(limited to 'kscurses/events.jai')

diff --git a/kscurses/events.jai b/kscurses/events.jai
new file mode 100644
index 0000000..603958e
--- /dev/null
+++ b/kscurses/events.jai
@@ -0,0 +1,256 @@
+Event :: struct {
+	type : enum u8 {
+		NONE	:: 0;
+		KEY		:: 1;
+		WINCH	:: 2;
+		TICK	:: 3;
+		INIT	:: 4;
+		USER	:: 5;
+	};
+	union {
+		key : Key;
+		data : *void;
+	}
+}
+
+__event_handler : struct {
+	proc := (e : Event, __data : *void) { 
+		assert(__data != null);
+		if e.type == {
+			case .NONE;
+			ks_write("empty_event!\n\r");
+			case .KEY;
+			ks_write(tprint("key = %\n\r", e.key));
+			case .WINCH;
+			ks_write(tprint("winch, size = %\n\r", terminal_state.size));
+			case .TICK;
+			ks_write(tprint("tick\n\r"));
+		}
+		if e.type == .KEY && e.key == .ESCAPE {
+			<<cast(*bool)__data = true; // stop_main = true
+		}
+	};
+	data : *void;
+}
+
+use_events :: (tick_duration_ms :s32= 1000, $use_clock := true, init_event := true) #expand {
+	init_mutexes();
+	#if use_clock clock_thread := start_clock_cycle(tick_duration_ms);
+	input_thread := start_input_cycle();
+	winlooker_thread := start_winlooker_cycle();
+	set_handler();
+	if init_event push_event(.{type = .INIT});
+	`defer {
+		restore_handler();
+		stop_winlooker_cycle(winlooker_thread);
+		stop_input_cycle(input_thread);
+		#if use_clock stop_clock_cycle(clock_thread);
+		deinit_mutexes();
+		reset_globals();
+	}
+}
+wait_and_process_events :: () -> bool {
+	wait_for(*event_wait_sem);
+	lock(*event_queue_mtx); defer unlock(*event_queue_mtx);
+	processed := false;
+	while 1 {
+		e, ok := pop(*event_queue);
+		if !ok break;
+		processed = true;
+		assert(e.type != .NONE);
+		__event_handler.proc(e, __event_handler.data);
+	}
+	return processed;
+}
+pop_events :: () -> bool {
+}
+push_event :: (e : Event) {
+	lock(*event_queue_mtx);
+	push(*event_queue, e);
+	unlock(*event_queue_mtx);
+	signal(*event_wait_sem);
+}
+
+restart_clock_cycle :: () {
+	if clock_state != .DISABLED {
+		lock(*mtx_clock_state);
+			if clock_state != .STOP {
+				clock_state = .RESTART;
+			}
+			signal(*sem_clock_breaker);
+		unlock(*mtx_clock_state);		
+	}
+}
+
+#scope_file
+// SIGWINCH --sigaction--> handler ---sem--> winlooker --push_event--|--> event_queue --pop_events--> master thread
+// 							     stdin --read--> input --push_event--|
+//												 clock --push_event--|
+
+// event_queue
+event_queue_mtx : Mutex;
+event_queue : Queue(Event);
+event_wait_sem : Semaphore;
+
+// handler
+handler :: (sig : s32) #c_call {
+	new_context : Context;
+	push_context new_context {
+		if sig == SIGWINCH {
+			signal(*winch_wait_sem);
+		} else {
+			log("signal = %\n\r", sig);
+		}		
+	}
+}
+set_handler :: () {
+	sa : sigaction_t;
+	sa.sa_handler = handler;
+	sigemptyset(*(sa.sa_mask));
+	sa.sa_flags = SA_RESTART;
+	sigaction(SIGWINCH, *sa, null);
+}
+restore_handler :: () {
+	sa : sigaction_t;
+	sa.sa_handler = SIG_DFL;
+	sigaction(SIGWINCH, null, *sa);
+}
+
+// winlooker
+winch_wait_sem : Semaphore;
+stop_winlooker := false;
+winlooker_cycle :: (thread : *Thread) -> s64 {
+	while !stop_winlooker {
+		wait_for(*winch_wait_sem);
+		if stop_winlooker break;
+		update_terminal_size();
+		push_event(.{type = .WINCH});
+	}
+	return 0;
+}
+start_winlooker_cycle :: () -> *Thread #expand {
+	init(*winch_wait_sem);
+	winlooker_thread : Thread;
+	thread_init(*winlooker_thread, winlooker_cycle);
+	thread_start(*winlooker_thread);
+	return *winlooker_thread;
+}
+stop_winlooker_cycle :: (winlooker_thread : *Thread) {
+	stop_winlooker = true;	
+	signal(*winch_wait_sem);
+	thread_deinit(winlooker_thread);
+	destroy(*winch_wait_sem);
+}
+
+// input
+stop_input := false;
+input_cycle :: (thread : *Thread) -> s64 {
+	tcflush(STDIN_FILENO, TCIFLUSH);
+	while !stop_input {
+		key := ks_getch();
+		if stop_input break;
+		push_event(.{type = .KEY, key = key});
+	}
+	return 0;
+}
+start_input_cycle :: () -> *Thread #expand {
+	input_thread : Thread;
+	thread_init(*input_thread, input_cycle);
+	log("input = %\n\r", formatInt(input_thread.thread_handle, base = 16));
+	thread_start(*input_thread);
+	return *input_thread;
+}
+stop_input_cycle :: (input_thread : *Thread) {
+	stop_input = true;
+	pthread_cancel(input_thread.thread_handle);
+	thread_deinit(input_thread);
+}
+
+// clock
+clock_state : enum u8 {
+	NORMAL	:: 0;
+	STOP	:: 1;
+	RESTART :: 2;
+	DISABLED:: 3;
+} = .DISABLED;
+sem_clock_breaker : Semaphore;
+mtx_clock_state : Mutex;
+
+clock_cycle :: (thread : *Thread) -> s64 {
+	tick_duration_ms := <<cast(*s32)thread.data;
+
+	while clock_state != .STOP {
+		lock(*mtx_clock_state); 
+			destroy(*sem_clock_breaker);
+			init(*sem_clock_breaker);
+			clock_state = .NORMAL;
+		unlock(*mtx_clock_state);
+
+		while 1 {
+			r := wait_for(*sem_clock_breaker, tick_duration_ms);
+
+			lock(*mtx_clock_state); defer unlock(*mtx_clock_state);
+			if clock_state != .NORMAL {
+				assert(r == .SUCCESS);
+				break;
+			} else {
+				push_event(.{type = .TICK});
+			}
+		}
+	}
+	return 0;
+}
+start_clock_cycle :: (tick_duration_ms : s32) -> *Thread #expand {
+	clock_thread : Thread;
+	init(*sem_clock_breaker);
+	init(*mtx_clock_state);
+	clock_state = .NORMAL;
+
+	thread_init(*clock_thread, clock_cycle);
+	
+	tick_duration_ms_ptr := New(s32);
+	<<tick_duration_ms_ptr = tick_duration_ms; 
+
+	clock_thread.data = tick_duration_ms_ptr;
+	log("clock = %\n\r", formatInt(clock_thread.thread_handle, base = 16));
+	thread_start(*clock_thread);
+	return *clock_thread;
+}
+stop_clock_cycle :: (clock_thread : *Thread) {
+	lock(*mtx_clock_state);
+		clock_state = .STOP;
+		signal(*sem_clock_breaker);
+	unlock(*mtx_clock_state);
+
+	thread_deinit(clock_thread);
+	free(clock_thread.data);
+	clock_state = .DISABLED;
+	destroy(*sem_clock_breaker);
+	destroy(*mtx_clock_state);
+}
+
+// utils
+reset_globals :: () {
+	stop_input = false;
+	clock_state = .NORMAL;
+	// stop_clock = false;
+	stop_winlooker = false;
+	// fd_winch = .[0, 0];
+	deinit(*event_queue);
+}
+init_mutexes :: () {
+	init(*event_wait_sem);
+	init(*event_queue_mtx);
+}
+deinit_mutexes :: () {
+	destroy(*event_queue_mtx);
+	destroy(*event_wait_sem);
+}
+
+
+TCIFLUSH :: 0;
+
+libc :: #system_library "libc";
+tcflush :: (fd : s32, queue_selector : s32) -> s32 #foreign libc;
+
+#import "Thread";
\ No newline at end of file
-- 
cgit v1.2.3