From c5b6f1611ea1f4685ef02f65fc0362f9c22c344f Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 24 Mar 2022 19:21:12 -0700
Subject: Semaphore example in toy

---
 usr/main.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'usr')

diff --git a/usr/main.c b/usr/main.c
index 835cedf..0cc25d8 100644
--- a/usr/main.c
+++ b/usr/main.c
@@ -1,4 +1,6 @@
+#include <cpu.h>
 #include <globals.h>
+#include <graphics/lfb.h>
 #include <symbols.h>
 #include <sys/schedule.h>
 #include <usr/string.h>
@@ -33,6 +35,25 @@ static struct UartInfo UART_INFO = {
 	.priority = 2,
 };
 
+static unsigned long simulated = 0;
+
+void producer(void)
+{
+	draw_string(0, 15, "Producing...");
+	sys1(SYS_SEMAPHORE_V, &simulated);
+	draw_string(0, 15, "Produced!   ");
+}
+
+void consumer(void)
+{
+	add_thread(producer, 0, 4);
+	while (1) {
+		draw_string(0, 16, "Consuming...");
+		sys1(SYS_SEMAPHORE_P, &simulated);
+		draw_string(0, 16, "Consumed!   ");
+	}
+}
+
 void main(void)
 {
 	subscribe_irq(UART_IRQ, handle_data, &UART_INFO);
@@ -40,5 +61,6 @@ void main(void)
 	subscribe_irq(SYS_TIMER_1_IRQ, loopt, &stime_1);
 	subscribe_irq(SYS_TIMER_2_IRQ, loopt, &stime_2);
 	subscribe_irq(SYS_TIMER_3_IRQ, loopt, &stime_3);
-	add_thread(loop, 0, 0);
+	add_thread(loop, 0, 8);
+	add_thread(consumer, 0, 3);
 }
-- 
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