From fd649915f60fbf6e2efee5ffc274dee88b0437b7 Mon Sep 17 00:00:00 2001
From: Minjie <mjopenglsdl@gmail.com>
Date: Tue, 4 Feb 2020 21:18:26 +0800
Subject: [PATCH] prevent spurious wake up

---
 countdownlatch.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/countdownlatch.cpp b/countdownlatch.cpp
index e3bacfd..82466f3 100644
--- a/countdownlatch.cpp
+++ b/countdownlatch.cpp
@@ -13,7 +13,10 @@ void clatch::countdownlatch::await(uint64_t nanosecs) {
     if (nanosecs > 0) {
        cv.wait_for(lck, std::chrono::nanoseconds(nanosecs));
     } else {
-       cv.wait(lck);
+
+        while (count > 0){
+            cv.wait(lck);
+        }
     }
 }