| //===----------------------------- config.h -------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| // |
| // Defines macros used within the libc++abi project. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| |
| #ifndef LIBCXXABI_CONFIG_H |
| #define LIBCXXABI_CONFIG_H |
| |
| #include <unistd.h> |
| |
| #if defined(_POSIX_THREADS) && _POSIX_THREADS > 0 |
| # define LIBCXXABI_SINGLE_THREADED 0 |
| #else |
| # define LIBCXXABI_SINGLE_THREADED 1 |
| #endif |
| |
| // Set this in the CXXFLAGS when you need it, because otherwise we'd have to |
| // #if !defined(__linux__) && !defined(__APPLE__) && ... |
| // and so-on for *every* platform. |
| #ifndef LIBCXXABI_BARE_METAL |
| # define LIBCXXABI_BARE_METAL 0 |
| #endif |
| |
| // -- BEGIN Taken from gabixx_config.h for gcc compat |
| // Clang provides __sync_swap(), but GCC does not. |
| // IMPORTANT: For GCC, __sync_lock_test_and_set has acquire semantics only |
| // so an explicit __sync_synchronize is needed to ensure a full barrier. |
| // TODO(digit): Use __atomic_swap_acq_rel when available. |
| #if !defined(__clang__) |
| # define __sync_swap(address, value) \ |
| __extension__ ({ \ |
| __typeof__(*(address)) __ret = __sync_lock_test_and_set((address),(value)); \ |
| __sync_synchronize(); \ |
| __ret; \ |
| }) |
| #endif |
| // -- END Taken from gabixx_config.h for gcc compat |
| |
| |
| #endif // LIBCXXABI_CONFIG_H |
