BIND 10 trac2236, updated. 1d4d9e796c10786417099a69e8c4e6e4c1cdfb8b [2236] Use PTHREAD_MUTEX_NORMAL fast mutexes by default

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- Log -----------------------------------------------------------------
commit 1d4d9e796c10786417099a69e8c4e6e4c1cdfb8b
Author: Mukund Sivaraman <muks at isc.org>
Date:   Thu Oct 25 06:49:58 2012 +0530

    [2236] Use PTHREAD_MUTEX_NORMAL fast mutexes by default

-----------------------------------------------------------------------

Summary of changes:
 src/lib/util/threads/sync.cc |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

-----------------------------------------------------------------------
diff --git a/src/lib/util/threads/sync.cc b/src/lib/util/threads/sync.cc
index cf68c5e..46a5646 100644
--- a/src/lib/util/threads/sync.cc
+++ b/src/lib/util/threads/sync.cc
@@ -77,13 +77,18 @@ Mutex::Mutex() :
     }
     Deinitializer deinitializer(attributes);
 
+    // If debug mode is enabled in compilation, use the slower
+    // error-checking mutexes that detect deadlocks. Otherwise, use fast
+    // mutexes which don't. See the pthread_mutexattr_settype() POSIX
+    // documentation which describes these type attributes.
 #ifdef ENABLE_DEBUG
-    // TODO: Distinguish if debug mode is enabled in compilation.
     result = pthread_mutexattr_settype(&attributes, PTHREAD_MUTEX_ERRORCHECK);
+#else
+    result = pthread_mutexattr_settype(&attributes, PTHREAD_MUTEX_NORMAL);
+#endif // ENABLE_DEBUG
     if (result != 0) {
         isc_throw(isc::InvalidOperation, std::strerror(result));
     }
-#endif // ENABLE_DEBUG
 
     auto_ptr<Impl> impl(new Impl);
     result = pthread_mutex_init(&impl->mutex, &attributes);