Guard against spurious wakeups in devicediscoveryclient.cpp

Like most condition variable implementations, std::condition_variable may
wake up spuriously, even though it is not signalled (see
http://en.cppreference.com/w/cpp/thread/condition_variable/wait).  Since
the intention of blocking on the std::condition_variable in main is to
wait forever, add a loop to block again after spurious wakeups.

Change-Id: I19b7ee13650b9b80250f935e2099119611fa61b3
Signed-off-by: William Dieter <william.r.dieter@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/355
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>
(cherry picked from commit 73b122b0590bc350c1a451d7d05db86e3f0121d3)
Reviewed-on: https://gerrit.iotivity.org/gerrit/392

diff --git a/resource/examples/devicediscoveryclient.cpp b/resource/examples/devicediscoveryclient.cpp
index fa630e3..8bbb55f 100644 (file)
--- a/resource/examples/devicediscoveryclient.cpp
+++ b/resource/examples/devicediscoveryclient.cpp
@@ -183,7 +183,10 @@ int main(int argc, char* argv[]) {
         std::mutex blocker;
         std::condition_variable cv;
         std::unique_lock<std::mutex> lock(blocker);
-        cv.wait(lock);
+        while(true)
+        {
+            cv.wait(lock);
+        }
 
     }catch(OCException& e)
     {