if it's a separate thread, it's allowed to hang (perf issue reported by BOINC)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45881 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/corefoundation/utilsexc_cf.cpp

@@ -26,6 +26,8 @@
 // Use polling instead of Mach ports, which doesn't work on Intel
 // due to task_for_pid security issues.
 
+// http://developer.apple.com/technotes/tn/tn2050.html
+
 // What's a better test for Intel vs PPC?
 #ifdef WORDS_BIGENDIAN
 #define USE_POLLING 0
@@ -80,7 +82,7 @@ void* wxProcessTerminationThread::Entry()
     {
         usleep(100);
         int status = 0;
-        int rc = waitpid(abs(m_data->pid), & status, WNOHANG);
+        int rc = waitpid(abs(m_data->pid), & status, 0);
         if (rc != 0)
         {
             if ((rc != -1) && WIFEXITED(status))