fix pit_busy_wait; better tasking

1 files changed, 28 insertions, 3 deletions

diff --git a/kernel.cpp b/kernel.cpp
index dab93c6..f16faa8 100644
--- a/kernel.cpp
+++ b/kernel.cpp
@@ -10,6 +10,8 @@
 static VGATerminal vga;
 TextOutput& term = vga;
 
+static volatile bool termBusy = false;
+
 void kernel_main(void) 
 {
     term.write("Clyne's kernel, v2024\n\n");
@@ -28,18 +30,41 @@ void kernel_main(void)
     gdt_initialize();
     pic_initialize();
     idt_initialize();
-    pit_initialize(50);
+    pit_initialize(100);
     asm volatile("sti");
     tasking_initialize();
     term.write("Tasking enabled.\n");
 
     tasking_spawn([] {
-        for (;;)
+        for (;;) {
+            do pit_busy_wait(1);
+            while (termBusy);
+
+            termBusy = true;
             term.write('B');
+            termBusy = false;
+        }
+    }, 256);
+
+    tasking_spawn([] {
+        for (;;) {
+            do pit_busy_wait(1);
+            while (termBusy);
+
+            termBusy = true;
+            term.write('C');
+            termBusy = false;
+        }
     }, 256);
 
-    for (;;)
+    for (;;) {
+        do pit_busy_wait(1);
+        while (termBusy);
+
+        termBusy = true;
         term.write('A');
+        termBusy = false;
+    }
 }
 
 extern "C"