THRIFT-4962 Fix deadlock in TimerManager::stop
Client: cpp
Author: Guillaume Blanc

This closes #1877
diff --git a/lib/cpp/src/thrift/concurrency/TimerManager.cpp b/lib/cpp/src/thrift/concurrency/TimerManager.cpp
index 003f564..703c19e 100644
--- a/lib/cpp/src/thrift/concurrency/TimerManager.cpp
+++ b/lib/cpp/src/thrift/concurrency/TimerManager.cpp
@@ -132,7 +132,7 @@
       Synchronized s(manager_->monitor_);
       if (manager_->state_ == TimerManager::STOPPING) {
         manager_->state_ = TimerManager::STOPPED;
-        manager_->monitor_.notify();
+        manager_->monitor_.notifyAll();
       }
     }
     return;