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-rw-r--r--butl/ft/shared_mutex15
1 files changed, 13 insertions, 2 deletions
diff --git a/butl/ft/shared_mutex b/butl/ft/shared_mutex
index 73bd3e9..18692c8 100644
--- a/butl/ft/shared_mutex
+++ b/butl/ft/shared_mutex
@@ -38,10 +38,21 @@
# endif
#endif
-// __cpp_lib_shared_mutex
+// __cpp_lib_shared_timed_mutex
//
#ifndef __cpp_lib_shared_timed_mutex
-# define __cpp_lib_shared_timed_mutex 201402
+ //
+ // On MacOS shared_timed_mutex is marked as unavailable until MacOS
+ // 10.12.
+ //
+# if defined(_LIBCPP_VERSION)
+# if !defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \
+ __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200
+# define __cpp_lib_shared_timed_mutex 201402
+# endif
+# else
+# define __cpp_lib_shared_timed_mutex 201402
+# endif
#endif
#endif // BUTL_FT_SHARED_MUTEX