coro.Semaphore: fix infinite waiting

Cloudef · Nov 11, 2024 · 4c03889 · 4c03889
1 parent 2b91534
commit 4c03889
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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);