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Diffstat (limited to 'libbutl/ft/shared_mutex.hxx')
| -rw-r--r-- | libbutl/ft/shared_mutex.hxx | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libbutl/ft/shared_mutex.hxx b/libbutl/ft/shared_mutex.hxx new file mode 100644 index 0000000..6c6d415 --- /dev/null +++ b/libbutl/ft/shared_mutex.hxx @@ -0,0 +1,58 @@ +// file : libbutl/ft/shared_mutex.hxx -*- C++ -*- +// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd +// license : MIT; see accompanying LICENSE file + +#ifndef LIBBUTL_FT_SHARED_MUTEX_HXX +#define LIBBUTL_FT_SHARED_MUTEX_HXX + +#include <cstddef> // _LIBCPP_VERSION +#include <shared_mutex> + +// __cpp_lib_shared_mutex +// +#ifndef __cpp_lib_shared_mutex + // + // VC has it since 1900. + // +# if defined(_MSC_VER) +# if _MSC_VER >= 1900 +# define __cpp_lib_shared_mutex 201505 +# endif + // + // Clang's libc++ seems to have it for a while (but not before 1200) so we + // assume it's there from 1200. It's also only enabled after C++14. But not + // for MacOS, where it is explicitly marked as unavailable until MacOS + // 10.12. + // +# elif defined(_LIBCPP_VERSION) && defined(_LIBCPP_STD_VER) +# if _LIBCPP_VERSION >= 1200 && \ + _LIBCPP_STD_VER > 14 && \ + (!defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__) || \ + __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101200) +# define __cpp_lib_shared_mutex 201505 +# endif + // + // GCC libstdc++ has it since GCC 6 and it defines the feature test macro. + // We will also use this for any other runtime. + // +# endif +#endif + +// __cpp_lib_shared_timed_mutex +// +#ifndef __cpp_lib_shared_timed_mutex + // + // 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 // LIBBUTL_FT_SHARED_MUTEX_HXX |