Use CLOCK_MONOTONIC by default

- Eliminated BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC.
- CLOCK_MONOTONIC is now always used whenever it is available.

include/boost/thread/detail/config.hpp

@@ -409,25 +409,21 @@
   #   endif
 #endif
 
-#if defined(BOOST_THREAD_PLATFORM_WIN32)
+#if defined(BOOST_THREAD_CHRONO_WINDOWS_API)
   #define BOOST_THREAD_HAS_MONO_CLOCK
   #define BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
-#elif defined(BOOST_THREAD_MACOS)
+#elif defined(BOOST_THREAD_CHRONO_MAC_API)
   #define BOOST_THREAD_HAS_MONO_CLOCK
 #else
   #include <time.h> // check for CLOCK_MONOTONIC
   #if defined(CLOCK_MONOTONIC)
     #define BOOST_THREAD_HAS_MONO_CLOCK
-    #if defined(BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC)
-      #define BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
-    #endif
-  #else
-    #undef BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC
+    #define BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
   #endif
 #endif
 
 #if defined(BOOST_THREAD_PLATFORM_WIN32)
-#elif ! defined BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC
+#elif ! defined BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
 #if defined BOOST_PTHREAD_HAS_TIMEDLOCK
 #define BOOST_THREAD_USES_PTHREAD_TIMEDLOCK
 #elif (defined(_POSIX_TIMEOUTS) && (_POSIX_TIMEOUTS-0)>=200112L) \

include/boost/thread/pthread/pthread_helpers.hpp

@@ -18,7 +18,7 @@ namespace boost
     {
       inline int cond_init(pthread_cond_t& cond) {
 
-  #ifdef BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC
+  #ifdef BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
               pthread_condattr_t attr;
               int res = pthread_condattr_init(&attr);
               if (res)

test/test_12949.cpp

@@ -4,7 +4,6 @@
 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #define BOOST_THREAD_VERSION 4
-//#define BOOST_THREAD_HAS_CONDATTR_SET_CLOCK_MONOTONIC
 
 //#include <boost/thread/thread.hpp>
 #include <boost/thread/condition_variable.hpp>