* Atomic operations do not require locking, but they are not very powerful.
*/
+# if !defined (__cplusplus) && (__STDC_VERSION__ >= 201112L) \
+ && !defined (__STDC_NO_ATOMICS__)
+
+/*** Native C11 atomics ***/
+# include <stdatomic.h>
+
+# else
+
+# define ATOMIC_FLAG_INIT false
+
+# define ATOMIC_VAR_INIT(value) (value)
+
+# define atomic_init(obj, value) \
+ do { *(obj) = (value); } while(0)
+
+# define kill_dependency(y) \
+ ((void)0)
+
+# define atomic_thread_fence(order) \
+ __sync_synchronize()
+
+# define atomic_signal_fence(order) \
+ ((void)0)
+
+# define atomic_is_lock_free(obj) \
+ false
+
+/* In principles, __sync_*() only supports int, long and long long and their
+ * 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). */
+typedef bool atomic_flag;
+typedef bool atomic_bool;
+typedef char atomic_char;
+typedef signed char atomic_schar;
+typedef unsigned char atomic_uchar;
+typedef short atomic_short;
+typedef unsigned short atomic_ushort;
+typedef int atomic_int;
+typedef unsigned int atomic_uint;
+typedef long atomic_long;
+typedef unsigned long atomic_ulong;
+typedef long long atomic_llong;
+typedef unsigned long long atomic_ullong;
+//typedef char16_t atomic_char16_t;
+//typedef char32_t atomic_char32_t;
+typedef wchar_t atomic_wchar_t;
+typedef int_least8_t atomic_int_least8_t;
+typedef uint_least8_t atomic_uint_least8_t;
+typedef int_least16_t atomic_int_least16_t;
+typedef uint_least16_t atomic_uint_least16_t;
+typedef int_least32_t atomic_int_least32_t;
+typedef uint_least32_t atomic_uint_least32_t;
+typedef int_least64_t atomic_int_least64_t;
+typedef uint_least64_t atomic_uint_least64_t;
+typedef int_fast8_t atomic_int_fast8_t;
+typedef uint_fast8_t atomic_uint_fast8_t;
+typedef int_fast16_t atomic_int_fast16_t;
+typedef uint_fast16_t atomic_uint_fast16_t;
+typedef int_fast32_t atomic_int_fast32_t;
+typedef uint_fast32_t atomic_uint_fast32_t;
+typedef int_fast64_t atomic_int_fast64_t;
+typedef uint_fast64_t atomic_uint_fast64_t;
+typedef intptr_t atomic_intptr_t;
+typedef uintptr_t atomic_uintptr_t;
+typedef size_t atomic_size_t;
+typedef ptrdiff_t atomic_ptrdiff_t;
+typedef intmax_t atomic_intmax_t;
+typedef uintmax_t atomic_uintmax_t;
+
+# if defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) || (defined (__clang__) && (defined (__x86_64__) || defined (__i386__)))
+
+/*** Intel/GCC atomics ***/
+
+# define atomic_store(object,desired) \
+ do { \
+ *(object) = (desired); \
+ __sync_synchronize(); \
+ } while (0)
+
+# define atomic_store_explicit(object,desired,order) \
+ atomic_store(object,desired)
+
+# define atomic_load(object) \
+ (__sync_synchronize(), *(object))
+
+# define atomic_load_explicit(object,order) \
+ atomic_load(object)
+
+# define atomic_exchange(object,desired) \
+({ \
+ typeof (object) _obj = (object); \
+ typeof (*object) _old; \
+ do \
+ _old = atomic_load(_obj); \
+ while (!__sync_bool_compare_and_swap(_obj, _old, (desired))); \
+ _old; \
+})
+
+# define atomic_exchange_explicit(object,desired,order) \
+ atomic_exchange(object,desired)
+
+# define atomic_compare_exchange(object,expected,desired) \
+({ \
+ typeof (object) _exp = (expected); \
+ typeof (*object) _old = *_exp; \
+ *_exp = __sync_val_compare_and_swap((object), _old, (desired)); \
+ *_exp == _old; \
+})
+
+# define atomic_compare_exchange_strong(object,expected,desired) \
+ atomic_compare_exchange(object, expected, desired)
+
+# 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(object, expected, desired)
+
+# define atomic_compare_exchange_weak_explicit(object,expected,desired,order) \
+ atomic_compare_exchange_weak(object, expected, desired)
+
+# define atomic_fetch_add(object,operand) \
+ __sync_fetch_and_add(object, operand)
+
+# define atomic_fetch_add_explicit(object,operand,order) \
+ atomic_fetch_add(object,operand)
+
+# define atomic_fetch_sub(object,operand) \
+ __sync_fetch_and_sub(object, operand)
+
+# define atomic_fetch_sub_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+# define atomic_fetch_or(object,operand) \
+ __sync_fetch_and_or(object, operand)
+
+# define atomic_fetch_or_explicit(object,operand,order) \
+ atomic_fetch_or(object,operand)
+
+# define atomic_fetch_xor(object,operand) \
+ __sync_fetch_and_sub(object, operand)
+
+# define atomic_fetch_xor_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+# define atomic_fetch_and(object,operand) \
+ __sync_fetch_and_and(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)
+
+# elif defined (__GNUC__)
+
+/*** No atomics ***/
+
+# define atomic_store(object,desired) \
+ do { \
+ typeof (object) _obj = (object); \
+ typeof (*object) _des = (desired); \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ *_obj = _des; \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ } while (0)
+# define atomic_store_explicit(object,desired,order) \
+ atomic_store(object,desired)
+
+# define atomic_load(object) \
+({ \
+ typeof (object) _obj = (object); \
+ typeof (*object) _old; \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ _old = *_obj; \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ _old; \
+})
+# define atomic_load_explicit(object,order) \
+ atomic_load(object)
+
+# define atomic_exchange(object,desired) \
+({ \
+ typeof (object) _obj = (object); \
+ typeof (*object) _des = (desired); \
+ typeof (*object) _old; \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ _old = *_obj; \
+ *_obj = _des; \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ _old; \
+})
+# define atomic_exchange_explicit(object,desired,order) \
+ atomic_exchange(object,desired)
+
+# define atomic_compare_exchange_strong(object,expected,desired) \
+({ \
+ typeof (object) _obj = (object); \
+ typeof (object) _exp = (expected); \
+ typeof (*object) _des = (desired); \
+ bool ret; \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ ret = *_obj == *_exp; \
+ if (ret) \
+ *_obj = _des; \
+ else \
+ *_exp = *_obj; \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ ret; \
+})
+# 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)
+
+# define atomic_fetch_OP(object,desired,op) \
+({ \
+ typeof (object) _obj = (object); \
+ typeof (*object) _des = (desired); \
+ typeof (*object) _old; \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ _old = *_obj; \
+ *_obj = (*_obj) op (_des); \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ _old; \
+})
+
+# define atomic_fetch_add(object,operand) \
+ atomic_fetch_OP(object,operand,+)
+# define atomic_fetch_add_explicit(object,operand,order) \
+ atomic_fetch_add(object,operand)
+
+# define atomic_fetch_sub(object,operand) \
+ atomic_fetch_OP(object,operand,-)
+# define atomic_fetch_sub_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+# define atomic_fetch_or(object,operand) \
+ atomic_fetch_OP(object,operand,|)
+# define atomic_fetch_or_explicit(object,operand,order) \
+ atomic_fetch_or(object,operand)
+
+# define atomic_fetch_xor(object,operand) \
+ atomic_fetch_OP(object,operand,^)
+# define atomic_fetch_xor_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+# define atomic_fetch_and(object,operand) \
+ atomic_fetch_OP(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
+
+/**
+ * Memory storage space for an atom. Never access it directly.
+ */
+typedef union
+{
+ atomic_uintptr_t u;
+} vlc_atomic_t;
+
/** Static initializer for \ref vlc_atomic_t */
# define VLC_ATOMIC_INIT(val) { (val) }
/* 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);
+}
+
+static inline uintptr_t vlc_atomic_set(vlc_atomic_t *atom, uintptr_t v)
+{
+ atomic_store(&atom->u, v);
+ return v;
+}
-VLC_API uintptr_t vlc_atomic_get(const vlc_atomic_t *);
-VLC_API uintptr_t vlc_atomic_set(vlc_atomic_t *, uintptr_t);
-VLC_API uintptr_t vlc_atomic_add(vlc_atomic_t *, uintptr_t);
+static inline uintptr_t vlc_atomic_add(vlc_atomic_t *atom, uintptr_t v)
+{
+ return atomic_fetch_add(&atom->u, v) + v;
+}
static inline uintptr_t vlc_atomic_sub (vlc_atomic_t *atom, uintptr_t v)
{
- return vlc_atomic_add (atom, -v);
+ return atomic_fetch_sub (&atom->u, v) - v;
}
static inline uintptr_t vlc_atomic_inc (vlc_atomic_t *atom)
return vlc_atomic_sub (atom, 1);
}
-VLC_API uintptr_t vlc_atomic_swap(vlc_atomic_t *, uintptr_t);
-VLC_API uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *, uintptr_t, uintptr_t);
+static inline uintptr_t vlc_atomic_swap(vlc_atomic_t *atom, uintptr_t v)
+{
+ return atomic_exchange(&atom->u, v);
+}
+
+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;
+}
+
+typedef atomic_uint_least32_t vlc_atomic_float;
/** Helper to retrieve a single precision from an atom. */
-static inline float vlc_atomic_getf(const vlc_atomic_t *atom)
+static inline float vlc_atomic_loadf(vlc_atomic_float *atom)
{
- union { float f; uintptr_t i; } u;
- u.i = vlc_atomic_get(atom);
+ union { float f; uint32_t i; } u;
+ u.i = atomic_load(atom);
return u.f;
}
/** Helper to store a single precision into an atom. */
-static inline float vlc_atomic_setf(vlc_atomic_t *atom, float f)
+static inline void vlc_atomic_storef(vlc_atomic_float *atom, float f)
{
- union { float f; uintptr_t i; } u;
+ union { float f; uint32_t i; } u;
u.f = f;
- vlc_atomic_set(atom, u.i);
- return f;
+ atomic_store(atom, u.i);
}
#endif
projects / vlc / blobdiff