* unsigned equivalents, i.e. 4-bytes and 8-bytes types, although GCC also
* supports 1 and 2-bytes types. Some non-x86 architectures do not support
* 8-byte atomic types (or not efficiently). */
+# if defined (_MSC_VER)
+/* Some atomic operations of the Interlocked API are only
+ available for desktop apps. Thus we define the atomic types to
+ be at least 32 bits wide. */
+typedef int_least32_t atomic_flag;
+typedef int_least32_t atomic_bool;
+typedef int_least32_t atomic_char;
+typedef int_least32_t atomic_schar;
+typedef uint_least32_t atomic_uchar;
+typedef int_least32_t atomic_short;
+typedef uint_least32_t atomic_ushort;
+# else
typedef bool atomic_flag;
typedef bool atomic_bool;
typedef char atomic_char;
typedef unsigned char atomic_uchar;
typedef short atomic_short;
typedef unsigned short atomic_ushort;
+# endif
typedef int atomic_int;
typedef unsigned int atomic_uint;
typedef long atomic_long;
# define atomic_flag_clear_explicit(object,order) \
atomic_flag_clear(object)
-# else
-# error FIXME: implement atomic operations for this compiler.
-# endif
-# endif
+# elif defined (_MSC_VER)
-/**
- * Memory storage space for an atom. Never access it directly.
- */
-typedef union
-{
- atomic_uintptr_t u;
-} vlc_atomic_t;
+# include <windows.h>
-/** Static initializer for \ref vlc_atomic_t */
-# define VLC_ATOMIC_INIT(val) { (val) }
+/*** Use the Interlocked API. ***/
-/* All functions return the atom value _after_ the operation. */
-static inline uintptr_t vlc_atomic_get(vlc_atomic_t *atom)
-{
- return atomic_load(&atom->u);
-}
+/* Define macros in order to dispatch to the correct function depending on the type.
+ Several ranges are need because some operations are not implemented for all types. */
+# define atomic_type_dispatch_32_64(operation, object, ...) \
+ (sizeof(*object) == 4 ? operation((LONG *)object, __VA_ARGS__) : \
+ sizeof(*object) == 8 ? operation##64((LONGLONG *)object, __VA_ARGS__) : \
+ (abort(), 0))
-static inline uintptr_t vlc_atomic_set(vlc_atomic_t *atom, uintptr_t v)
-{
- atomic_store(&atom->u, v);
- return v;
-}
+# define atomic_type_dispatch_16_64(operation, object, ...) \
+ (sizeof(*object) == 2 ? operation##16((short *)object, __VA_ARGS__) : \
+ atomic_type_dispatch_32_64(operation, object, __VA_ARGS__))
-static inline uintptr_t vlc_atomic_add(vlc_atomic_t *atom, uintptr_t v)
-{
- return atomic_fetch_add(&atom->u, v) + v;
-}
+# define atomic_type_dispatch_8_64(operation, object, ...) \
+ (sizeof(*object) == 1 ? operation##8((char *)object, __VA_ARGS__) : \
+ atomic_type_dispatch_16_64(operation, object, __VA_ARGS__))
-static inline uintptr_t vlc_atomic_sub (vlc_atomic_t *atom, uintptr_t v)
-{
- return atomic_fetch_sub (&atom->u, v) - v;
-}
+# define atomic_store(object,desired) \
+ atomic_type_dispatch_16_64(InterlockedExchange, object, desired)
+# define atomic_store_explicit(object,desired,order) \
+ atomic_store(object, desired)
-static inline uintptr_t vlc_atomic_inc (vlc_atomic_t *atom)
-{
- return vlc_atomic_add (atom, 1);
-}
+# define atomic_load(object) \
+ atomic_type_dispatch_16_64(InterlockedCompareExchange, object, 0, 0)
+# define atomic_load_explicit(object,order) \
+ atomic_load(object)
-static inline uintptr_t vlc_atomic_dec (vlc_atomic_t *atom)
-{
- return vlc_atomic_sub (atom, 1);
-}
+# define atomic_exchange(object,desired) \
+ atomic_type_dispatch_16_64(InterlockedExchange, object, desired)
+# define atomic_exchange_explicit(object,desired,order) \
+ atomic_exchange(object, desired)
-static inline uintptr_t vlc_atomic_swap(vlc_atomic_t *atom, uintptr_t v)
-{
- return atomic_exchange(&atom->u, v);
-}
+# define atomic_compare_exchange_strong(object,expected,desired) \
+ atomic_type_dispatch_16_64(InterlockedCompareExchange, object, *expected, desired) == *expected
+# define atomic_compare_exchange_strong_explicit(object,expected,desired,order) \
+ atomic_compare_exchange_strong(object, expected, desired)
+# define atomic_compare_exchange_weak(object,expected,desired) \
+ atomic_compare_exchange_strong(object, expected, desired)
+# define atomic_compare_exchange_weak_explicit(object,expected,desired,order) \
+ atomic_compare_exchange_weak(object, expected, desired)
-static inline uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *atom,
- uintptr_t u, uintptr_t v)
-{
- atomic_compare_exchange_strong(&atom->u, &u, v);
- return u;
-}
+# define atomic_fetch_add(object,operand) \
+ atomic_type_dispatch_32_64(InterlockedExchangeAdd, object, operand)
+# define atomic_fetch_add_explicit(object,operand,order) \
+ atomic_fetch_add(object, operand)
+
+# define atomic_fetch_sub(object,operand) \
+ atomic_type_dispatch_32_64(InterlockedExchangeAdd, object, -(LONGLONG)operand)
+# define atomic_fetch_sub_explicit(object,operand,order) \
+ atomic_fetch_sub(object, operand)
+
+# define atomic_fetch_or(object,operand) \
+ atomic_type_dispatch_8_64(InterlockedOr, object, operand)
+# define atomic_fetch_or_explicit(object,operand,order) \
+ atomic_fetch_or(object, operand)
+
+# define atomic_fetch_xor(object,operand) \
+ atomic_type_dispatch_8_64(InterlockedXor, object, operand)
+# define atomic_fetch_xor_explicit(object,operand,order) \
+ atomic_fetch_sub(object, operand)
+
+# define atomic_fetch_and(object,operand) \
+ atomic_type_dispatch_8_64(InterlockedAnd, object, operand)
+# define atomic_fetch_and_explicit(object,operand,order) \
+ atomic_fetch_and(object, operand)
+
+# define atomic_flag_test_and_set(object) \
+ atomic_exchange(object, true)
+
+# define atomic_flag_test_and_set_explicit(object,order) \
+ atomic_flag_test_and_set(object)
+
+# define atomic_flag_clear(object) \
+ atomic_store(object, false)
+
+# define atomic_flag_clear_explicit(object,order) \
+ atomic_flag_clear(object)
+
+# else
+# error FIXME: implement atomic operations for this compiler.
+# endif
+# endif
typedef atomic_uint_least32_t vlc_atomic_float;
+static inline void vlc_atomic_init_float(vlc_atomic_float *var, float f)
+{
+ union { float f; uint32_t i; } u;
+ u.f = f;
+ atomic_init(var, u.i);
+}
+
/** Helper to retrieve a single precision from an atom. */
-static inline float vlc_atomic_loadf(vlc_atomic_float *atom)
+static inline float vlc_atomic_load_float(vlc_atomic_float *atom)
{
union { float f; uint32_t i; } u;
u.i = atomic_load(atom);
}
/** Helper to store a single precision into an atom. */
-static inline void vlc_atomic_storef(vlc_atomic_float *atom, float f)
+static inline void vlc_atomic_store_float(vlc_atomic_float *atom, float f)
{
union { float f; uint32_t i; } u;
u.f = f;
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