From 4c03889fe2dfee7f8b765e06c054214e658e0cc9 Mon Sep 17 00:00:00 2001
From: YiraSan <yirasan.bk@gmail.com>
Date: Mon, 11 Nov 2024 11:47:00 +0100
Subject: [PATCH] coro.Semaphore: fix infinite waiting

---
 src/coro/Sync.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/coro/Sync.zig b/src/coro/Sync.zig
index 505812e..2607a50 100644
--- a/src/coro/Sync.zig
+++ b/src/coro/Sync.zig
@@ -18,6 +18,7 @@ pub const Semaphore = struct {
         if (Frame.current()) |frame| {
             if (frame.canceled) return error.Canceled;
             self.counter += 1;
+            if (self.counter == 1) return;
             self.waiters.prepend(&frame.wait_link);
             defer self.waiters.remove(&frame.wait_link);
             while (self.counter > 0 and !frame.canceled) Frame.yield(.semaphore);