diff options
Diffstat (limited to 'libc/include/stdatomic.h')
| -rw-r--r-- | libc/include/stdatomic.h | 258 |
1 files changed, 3 insertions, 255 deletions
diff --git a/libc/include/stdatomic.h b/libc/include/stdatomic.h index 3c613346d..b7dac4a44 100644 --- a/libc/include/stdatomic.h +++ b/libc/include/stdatomic.h @@ -32,7 +32,7 @@ #include <sys/cdefs.h> -#if defined(__cplusplus) && __cplusplus >= 201103L && defined(_USING_LIBCXX) +#if defined(__cplusplus) && __cplusplus >= 201103L && __has_include(<atomic>) # if __has_feature(cxx_atomic) # define _STDATOMIC_HAVE_ATOMIC # endif @@ -127,260 +127,8 @@ using std::atomic_uintmax_t; #else /* <atomic> unavailable, possibly because this is C, not C++ */ -#include <sys/types.h> -#include <stdbool.h> - -/* - * C: Do it ourselves. - * Note that the runtime representation defined here should be compatible - * with the C++ one, i.e. an _Atomic(T) needs to contain the same - * bits as a T. - */ - -#include <stddef.h> /* For ptrdiff_t. */ -#include <stdint.h> /* TODO: don't drag in all the macros, just the types. */ -// Include uchar.h only when available. Bionic's stdatomic.h is also used for -// the host (via a copy in prebuilts/clang) and uchar.h is not available in the -// glibc used for the host. -#if defined(__BIONIC__) -# include <uchar.h> /* For char16_t and char32_t. */ -#endif - -/* - * 7.17.1 Atomic lock-free macros. - */ - -#ifdef __GCC_ATOMIC_BOOL_LOCK_FREE -#define ATOMIC_BOOL_LOCK_FREE __GCC_ATOMIC_BOOL_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_CHAR_LOCK_FREE -#define ATOMIC_CHAR_LOCK_FREE __GCC_ATOMIC_CHAR_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_CHAR16_T_LOCK_FREE -#define ATOMIC_CHAR16_T_LOCK_FREE __GCC_ATOMIC_CHAR16_T_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_CHAR32_T_LOCK_FREE -#define ATOMIC_CHAR32_T_LOCK_FREE __GCC_ATOMIC_CHAR32_T_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_WCHAR_T_LOCK_FREE -#define ATOMIC_WCHAR_T_LOCK_FREE __GCC_ATOMIC_WCHAR_T_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_SHORT_LOCK_FREE -#define ATOMIC_SHORT_LOCK_FREE __GCC_ATOMIC_SHORT_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_INT_LOCK_FREE -#define ATOMIC_INT_LOCK_FREE __GCC_ATOMIC_INT_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_LONG_LOCK_FREE -#define ATOMIC_LONG_LOCK_FREE __GCC_ATOMIC_LONG_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_LLONG_LOCK_FREE -#define ATOMIC_LLONG_LOCK_FREE __GCC_ATOMIC_LLONG_LOCK_FREE -#endif -#ifdef __GCC_ATOMIC_POINTER_LOCK_FREE -#define ATOMIC_POINTER_LOCK_FREE __GCC_ATOMIC_POINTER_LOCK_FREE -#endif - -/* - * 7.17.2 Initialization. - */ - -#define ATOMIC_VAR_INIT(value) (value) -#define atomic_init(obj, value) __c11_atomic_init(obj, value) - -/* - * Clang and recent GCC both provide predefined macros for the memory - * orderings. If we are using a compiler that doesn't define them, use the - * clang values - these will be ignored in the fallback path. - */ - -#ifndef __ATOMIC_RELAXED -#define __ATOMIC_RELAXED 0 -#endif -#ifndef __ATOMIC_CONSUME -#define __ATOMIC_CONSUME 1 -#endif -#ifndef __ATOMIC_ACQUIRE -#define __ATOMIC_ACQUIRE 2 -#endif -#ifndef __ATOMIC_RELEASE -#define __ATOMIC_RELEASE 3 -#endif -#ifndef __ATOMIC_ACQ_REL -#define __ATOMIC_ACQ_REL 4 -#endif -#ifndef __ATOMIC_SEQ_CST -#define __ATOMIC_SEQ_CST 5 -#endif - -/* - * 7.17.3 Order and consistency. - * - * The memory_order_* constants that denote the barrier behaviour of the - * atomic operations. - * The enum values must be identical to those used by the - * C++ <atomic> header. - */ - -typedef enum { - memory_order_relaxed = __ATOMIC_RELAXED, - memory_order_consume = __ATOMIC_CONSUME, - memory_order_acquire = __ATOMIC_ACQUIRE, - memory_order_release = __ATOMIC_RELEASE, - memory_order_acq_rel = __ATOMIC_ACQ_REL, - memory_order_seq_cst = __ATOMIC_SEQ_CST -} memory_order; - -/* - * 7.17.4 Fences. - */ - -static __inline void atomic_thread_fence(memory_order __order __attribute__((unused))) { - __c11_atomic_thread_fence(__order); -} - -static __inline void atomic_signal_fence(memory_order __order __attribute__((unused))) { - __c11_atomic_signal_fence(__order); -} - -/* - * 7.17.5 Lock-free property. - */ - -#define atomic_is_lock_free(obj) __c11_atomic_is_lock_free(sizeof(*(obj))) - -/* - * 7.17.6 Atomic integer types. - */ - -typedef _Atomic(bool) atomic_bool; -typedef _Atomic(char) atomic_char; -typedef _Atomic(signed char) atomic_schar; -typedef _Atomic(unsigned char) atomic_uchar; -typedef _Atomic(short) atomic_short; -typedef _Atomic(unsigned short) atomic_ushort; -typedef _Atomic(int) atomic_int; -typedef _Atomic(unsigned int) atomic_uint; -typedef _Atomic(long) atomic_long; -typedef _Atomic(unsigned long) atomic_ulong; -typedef _Atomic(long long) atomic_llong; -typedef _Atomic(unsigned long long) atomic_ullong; -#if defined(__BIONIC__) || (defined(__cplusplus) && __cplusplus >= 201103L) - typedef _Atomic(char16_t) atomic_char16_t; - typedef _Atomic(char32_t) atomic_char32_t; -#endif -typedef _Atomic(wchar_t) atomic_wchar_t; -typedef _Atomic(int_least8_t) atomic_int_least8_t; -typedef _Atomic(uint_least8_t) atomic_uint_least8_t; -typedef _Atomic(int_least16_t) atomic_int_least16_t; -typedef _Atomic(uint_least16_t) atomic_uint_least16_t; -typedef _Atomic(int_least32_t) atomic_int_least32_t; -typedef _Atomic(uint_least32_t) atomic_uint_least32_t; -typedef _Atomic(int_least64_t) atomic_int_least64_t; -typedef _Atomic(uint_least64_t) atomic_uint_least64_t; -typedef _Atomic(int_fast8_t) atomic_int_fast8_t; -typedef _Atomic(uint_fast8_t) atomic_uint_fast8_t; -typedef _Atomic(int_fast16_t) atomic_int_fast16_t; -typedef _Atomic(uint_fast16_t) atomic_uint_fast16_t; -typedef _Atomic(int_fast32_t) atomic_int_fast32_t; -typedef _Atomic(uint_fast32_t) atomic_uint_fast32_t; -typedef _Atomic(int_fast64_t) atomic_int_fast64_t; -typedef _Atomic(uint_fast64_t) atomic_uint_fast64_t; -typedef _Atomic(intptr_t) atomic_intptr_t; -typedef _Atomic(uintptr_t) atomic_uintptr_t; -typedef _Atomic(size_t) atomic_size_t; -typedef _Atomic(ptrdiff_t) atomic_ptrdiff_t; -typedef _Atomic(intmax_t) atomic_intmax_t; -typedef _Atomic(uintmax_t) atomic_uintmax_t; - -/* - * 7.17.7 Operations on atomic types. - */ - -/* - * Compiler-specific operations. - */ - -#define atomic_compare_exchange_strong_explicit(object, expected, \ - desired, success, failure) \ - __c11_atomic_compare_exchange_strong(object, expected, desired, \ - success, failure) -#define atomic_compare_exchange_weak_explicit(object, expected, \ - desired, success, failure) \ - __c11_atomic_compare_exchange_weak(object, expected, desired, \ - success, failure) -#define atomic_exchange_explicit(object, desired, order) \ - __c11_atomic_exchange(object, desired, order) -#define atomic_fetch_add_explicit(object, operand, order) \ - __c11_atomic_fetch_add(object, operand, order) -#define atomic_fetch_and_explicit(object, operand, order) \ - __c11_atomic_fetch_and(object, operand, order) -#define atomic_fetch_or_explicit(object, operand, order) \ - __c11_atomic_fetch_or(object, operand, order) -#define atomic_fetch_sub_explicit(object, operand, order) \ - __c11_atomic_fetch_sub(object, operand, order) -#define atomic_fetch_xor_explicit(object, operand, order) \ - __c11_atomic_fetch_xor(object, operand, order) -#define atomic_load_explicit(object, order) \ - __c11_atomic_load(object, order) -#define atomic_store_explicit(object, desired, order) \ - __c11_atomic_store(object, desired, order) - -/* - * Convenience functions. - */ - -#define atomic_compare_exchange_strong(object, expected, desired) \ - atomic_compare_exchange_strong_explicit(object, expected, \ - desired, memory_order_seq_cst, memory_order_seq_cst) -#define atomic_compare_exchange_weak(object, expected, desired) \ - atomic_compare_exchange_weak_explicit(object, expected, \ - desired, memory_order_seq_cst, memory_order_seq_cst) -#define atomic_exchange(object, desired) \ - atomic_exchange_explicit(object, desired, memory_order_seq_cst) -#define atomic_fetch_add(object, operand) \ - atomic_fetch_add_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_and(object, operand) \ - atomic_fetch_and_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_or(object, operand) \ - atomic_fetch_or_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_sub(object, operand) \ - atomic_fetch_sub_explicit(object, operand, memory_order_seq_cst) -#define atomic_fetch_xor(object, operand) \ - atomic_fetch_xor_explicit(object, operand, memory_order_seq_cst) -#define atomic_load(object) \ - atomic_load_explicit(object, memory_order_seq_cst) -#define atomic_store(object, desired) \ - atomic_store_explicit(object, desired, memory_order_seq_cst) - -/* - * 7.17.8 Atomic flag type and operations. - * - * XXX: Assume atomic_bool can be used as an atomic_flag. Is there some - * kind of compiler built-in type we could use? - */ - -typedef struct { - atomic_bool __flag; -} atomic_flag; - -#define ATOMIC_FLAG_INIT { ATOMIC_VAR_INIT(false) } - -static __inline bool atomic_flag_test_and_set_explicit(volatile atomic_flag *__object, memory_order __order) { - return (atomic_exchange_explicit(&__object->__flag, 1, __order)); -} - -static __inline void atomic_flag_clear_explicit(volatile atomic_flag *__object, memory_order __order) { - atomic_store_explicit(&__object->__flag, 0, __order); -} - -static __inline bool atomic_flag_test_and_set(volatile atomic_flag *__object) { - return (atomic_flag_test_and_set_explicit(__object, memory_order_seq_cst)); -} - -static __inline void atomic_flag_clear(volatile atomic_flag *__object) { - atomic_flag_clear_explicit(__object, memory_order_seq_cst); -} +/* Actual implementation is in bits/stdatomic.h since our test code is C++. */ +#include <bits/stdatomic.h> #endif /* <atomic> unavailable */ |