#include <sys/cdefs.h>
#include <sys/_types.h>
-#if __has_feature(cxx_atomic)
+#if __has_extension(c_atomic) || __has_extension(cxx_atomic)
#define __CLANG_ATOMICS
#elif __GNUC_PREREQ__(4, 7)
#define __GNUC_ATOMICS
-#elif !defined(__GNUC__)
+#elif defined(__GNUC__)
+#define __SYNC_ATOMICS
+#else
#error "stdatomic.h does not support your compiler"
#endif
-#if !defined(__CLANG_ATOMICS)
-#define _Atomic(T) struct { volatile T __val; }
+/*
+ * 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
/*
#define atomic_init(obj, value) __c11_atomic_init(obj, value)
#else
#define ATOMIC_VAR_INIT(value) { .__val = (value) }
-#define atomic_init(obj, value) do { \
- (obj)->__val = (value); \
-} while (0)
+#define atomic_init(obj, value) ((void)((obj)->__val = (value)))
#endif
/*
* atomic operations.
*/
-enum memory_order {
+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 __unused)
+{
+
#ifdef __CLANG_ATOMICS
-#define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
-#define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
+ __c11_atomic_thread_fence(__order);
#elif defined(__GNUC_ATOMICS)
-#define atomic_thread_fence(order) __atomic_thread_fence(order)
-#define atomic_signal_fence(order) __atomic_signal_fence(order)
+ __atomic_thread_fence(__order);
#else
-#define atomic_thread_fence(order) __sync_synchronize()
-#define atomic_signal_fence(order) __asm volatile ("" : : : "memory")
+ __sync_synchronize();
#endif
+}
+
+static __inline void
+atomic_signal_fence(memory_order __order __unused)
+{
+
+#ifdef __CLANG_ATOMICS
+ __c11_atomic_signal_fence(__order);
+#elif defined(__GNUC_ATOMICS)
+ __atomic_signal_fence(__order);
+#else
+ __asm volatile ("" ::: "memory");
+#endif
+}
/*
* 7.17.5 Lock-free property.
*/
-#if defined(__CLANG_ATOMICS)
+#if defined(_KERNEL)
+/* Atomics in kernelspace are always lock-free. */
#define atomic_is_lock_free(obj) \
- __c11_atomic_is_lock_free(sizeof(obj))
+ ((void)(obj), (_Bool)1)
+#elif defined(__CLANG_ATOMICS)
+#define atomic_is_lock_free(obj) \
+ __atomic_is_lock_free(sizeof(*(obj)), obj)
#elif defined(__GNUC_ATOMICS)
#define atomic_is_lock_free(obj) \
- __atomic_is_lock_free(sizeof((obj)->__val))
+ __atomic_is_lock_free(sizeof((obj)->__val), &(obj)->__val)
#else
#define atomic_is_lock_free(obj) \
- (sizeof((obj)->__val) <= sizeof(void *))
+ ((void)(obj), sizeof((obj)->__val) <= sizeof(void *))
#endif
/*
#define atomic_store_explicit(object, desired, order) \
__atomic_store_n(&(object)->__val, desired, order)
#else
+#define __atomic_apply_stride(object, operand) \
+ (((__typeof__((object)->__val))0) + (operand))
#define atomic_compare_exchange_strong_explicit(object, expected, \
- desired, success, failure) ({ \
- __typeof__((object)->__val) __v; \
- _Bool __r; \
- __v = __sync_val_compare_and_swap(&(object)->__val, \
- *(expected), desired); \
- __r = *(expected) == __v; \
- *(expected) = __v; \
- __r; \
+ desired, success, failure) __extension__ ({ \
+ __typeof__(expected) __ep = (expected); \
+ __typeof__(*__ep) __e = *__ep; \
+ (void)(success); (void)(failure); \
+ (_Bool)((*__ep = __sync_val_compare_and_swap(&(object)->__val, \
+ __e, desired)) == __e); \
})
-
#define atomic_compare_exchange_weak_explicit(object, expected, \
desired, success, failure) \
atomic_compare_exchange_strong_explicit(object, expected, \
desired, success, failure)
#if __has_builtin(__sync_swap)
/* Clang provides a full-barrier atomic exchange - use it if available. */
-#define atomic_exchange_explicit(object, desired, order) \
- __sync_swap(&(object)->__val, desired)
+#define atomic_exchange_explicit(object, desired, order) \
+ ((void)(order), __sync_swap(&(object)->__val, desired))
#else
/*
* __sync_lock_test_and_set() is only an acquire barrier in theory (although in
- * practice it is usually a full barrier) so we need an explicit barrier after
+ * practice it is usually a full barrier) so we need an explicit barrier before
* it.
*/
-#define atomic_exchange_explicit(object, desired, order) ({ \
- __typeof__((object)->__val) __v; \
- __v = __sync_lock_test_and_set(&(object)->__val, desired); \
+#define atomic_exchange_explicit(object, desired, order) \
+__extension__ ({ \
+ __typeof__(object) __o = (object); \
+ __typeof__(desired) __d = (desired); \
+ (void)(order); \
__sync_synchronize(); \
- __v; \
+ __sync_lock_test_and_set(&(__o)->__val, __d); \
})
#endif
#define atomic_fetch_add_explicit(object, operand, order) \
- __sync_fetch_and_add(&(object)->__val, operand)
+ ((void)(order), __sync_fetch_and_add(&(object)->__val, \
+ __atomic_apply_stride(object, operand)))
#define atomic_fetch_and_explicit(object, operand, order) \
- __sync_fetch_and_and(&(object)->__val, operand)
+ ((void)(order), __sync_fetch_and_and(&(object)->__val, operand))
#define atomic_fetch_or_explicit(object, operand, order) \
- __sync_fetch_and_or(&(object)->__val, operand)
+ ((void)(order), __sync_fetch_and_or(&(object)->__val, operand))
#define atomic_fetch_sub_explicit(object, operand, order) \
- __sync_fetch_and_sub(&(object)->__val, operand)
+ ((void)(order), __sync_fetch_and_sub(&(object)->__val, \
+ __atomic_apply_stride(object, operand)))
#define atomic_fetch_xor_explicit(object, operand, order) \
- __sync_fetch_and_xor(&(object)->__val, operand)
+ ((void)(order), __sync_fetch_and_xor(&(object)->__val, operand))
#define atomic_load_explicit(object, order) \
- __sync_fetch_and_add(&(object)->__val, 0)
-#define atomic_store_explicit(object, desired, order) do { \
- __sync_synchronize(); \
- (object)->__val = (desired); \
- __sync_synchronize(); \
-} while (0)
+ ((void)(order), __sync_fetch_and_add(&(object)->__val, 0))
+#define atomic_store_explicit(object, desired, order) \
+ ((void)atomic_exchange_explicit(object, desired, order))
#endif
/*
* Convenience functions.
+ *
+ * Don't provide these in kernel space. In kernel space, we should be
+ * disciplined enough to always provide explicit barriers.
*/
+#ifndef _KERNEL
#define atomic_compare_exchange_strong(object, expected, desired) \
atomic_compare_exchange_strong_explicit(object, expected, \
desired, memory_order_seq_cst, memory_order_seq_cst)
atomic_load_explicit(object, memory_order_seq_cst)
#define atomic_store(object, desired) \
atomic_store_explicit(object, desired, memory_order_seq_cst)
+#endif /* !_KERNEL */
/*
* 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 atomic_bool atomic_flag;
+typedef struct {
+ atomic_bool __flag;
+} atomic_flag;
+
+#define ATOMIC_FLAG_INIT { ATOMIC_VAR_INIT(0) }
+
+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);
+}
+
+#ifndef _KERNEL
+static __inline _Bool
+atomic_flag_test_and_set(volatile atomic_flag *__object)
+{
-#define ATOMIC_FLAG_INIT ATOMIC_VAR_INIT(0)
+ return (atomic_flag_test_and_set_explicit(__object,
+ memory_order_seq_cst));
+}
-#define atomic_flag_clear_explicit(object, order) \
- atomic_store_explicit(object, 0, order)
-#define atomic_flag_test_and_set_explicit(object, order) \
- atomic_compare_exchange_strong_explicit(object, 0, 1, order, order)
+static __inline void
+atomic_flag_clear(volatile atomic_flag *__object)
+{
-#define atomic_flag_clear(object) \
- atomic_flag_clear_explicit(object, memory_order_seq_cst)
-#define atomic_flag_test_and_set(object) \
- atomic_flag_test_and_set_explicit(object, memory_order_seq_cst)
+ atomic_flag_clear_explicit(__object, memory_order_seq_cst);
+}
+#endif /* !_KERNEL */
#endif /* !_STDATOMIC_H_ */
# define __ptrvalue /* nothing */
#endif
+/*
+ * Testing against Clang-specific extensions.
+ */
+
+#ifndef __has_extension
+#define __has_extension __has_feature
+#endif
+#ifndef __has_feature
+#define __has_feature(x) 0
+#endif
+#ifndef __has_include
+#define __has_include(x) 0
+#endif
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
#if defined(__cplusplus)
#define __BEGIN_DECLS extern "C" {
#define __END_DECLS }
/*
* Keywords added in C11.
*/
-#if defined(__cplusplus) && __cplusplus >= 201103L
-#define _Alignas(e) alignas(e)
-#define _Alignof(e) alignof(e)
-#define _Noreturn [[noreturn]]
-#define _Static_assert(e, s) static_assert(e, s)
-/* FIXME: change this to thread_local when clang in base supports it */
-#define _Thread_local __thread
-#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
-/* Do nothing. They are language keywords. */
+
+#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
+
+#if !__has_extension(c_alignas)
+#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
+ __has_extension(cxx_alignas)
+#define _Alignas(x) alignas(x)
#else
-/* Not supported. Implement them using our versions. */
+/* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
#define _Alignas(x) __aligned(x)
+#endif
+#endif
+
+#if defined(__cplusplus) && __cplusplus >= 201103L
+#define _Alignof(x) alignof(x)
+#else
#define _Alignof(x) __alignof(x)
+#endif
+
+#if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
+/*
+ * No native support for _Atomic(). Place object in structure to prevent
+ * most forms of direct non-atomic access.
+ */
+#define _Atomic(T) struct { T volatile __val; }
+#endif
+
+#if defined(__cplusplus) && __cplusplus >= 201103L
+#define _Noreturn [[noreturn]]
+#else
#define _Noreturn __dead2
-#define _Thread_local __thread
+#endif
+
#if __GNUC_PREREQ__(4, 6) && !defined(__cplusplus)
/* Do nothing: _Static_assert() works as per C11 */
+#elif !__has_extension(c_static_assert)
+#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
+ __has_extension(cxx_static_assert)
+#define _Static_assert(x, y) static_assert(x, y)
#elif defined(__COUNTER__)
#define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
#define __Static_assert(x, y) ___Static_assert(x, y)
#endif
#endif
+#if !__has_extension(c_thread_local)
+/* XXX: Change this to test against C++11 when clang in base supports it. */
+#if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
+ __has_extension(cxx_thread_local)
+#define _Thread_local thread_local
+#else
+#define _Thread_local __thread
+#endif
+#endif
+
+#endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
+
/*
* Emulation of C11 _Generic(). Unlike the previously defined C11
* keywords, it is not possible to implement this using exactly the same
#endif
#endif
-#ifndef __has_extension
-#define __has_extension __has_feature
-#endif
-#ifndef __has_feature
-#define __has_feature(x) 0
-#endif
-#ifndef __has_include
-#define __has_include(x) 0
-#endif
-#ifndef __has_builtin
-#define __has_builtin(x) 0
-#endif
-
#endif /* !_SYS_CDEFS_H_ */
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