# if !defined (__cplusplus) && (__STDC_VERSION__ >= 201112L) \
&& !defined (__STDC_NO_ATOMICS__)
+
+/*** Native C11 atomics ***/
# include <stdatomic.h>
-# else /* if (???) */
+# elif defined (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
+
+/*** Intel/GCC atomics ***/
# define ATOMIC_FLAG_INIT false
* 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). So lets stick to (u)intptr_t. */
-typedef intptr_t atomic_flag;
-typedef intptr_t atomic_bool;
-typedef intptr_t atomic_char;
-typedef intptr_t atomic_schar;
-typedef uintptr_t atomic_uchar;
-typedef intptr_t atomic_short;
-typedef uintptr_t atomic_ushort;
-typedef intptr_t atomic_int;
-typedef uintptr_t atomic_uint;
-//typedef signed long atomic_long;
-//typedef unsigned long atomic_ulong;
-//typedef signed long long atomic_llong;
-//typedef unsigned long long atomic_ullong;
-/* ... */
-typedef intptr_t atomic_intptr_t;
-typedef uintptr_t atomic_uintptr_t;
-typedef uintptr_t atomic_size_t;
-typedef intptr_t atomic_ptrdiff_t;
-//typedef intmax_t atomic_intmax_t;
-//typedef uintmax_t atomic_uintmax_t;
+typedef intptr_t atomic_flag;
+typedef intptr_t atomic_bool;
+typedef intptr_t atomic_char;
+typedef intptr_t atomic_schar;
+typedef uintptr_t atomic_uchar;
+typedef intptr_t atomic_short;
+typedef uintptr_t atomic_ushort;
+typedef intptr_t atomic_int;
+typedef uintptr_t atomic_uint;
+typedef intptr_t atomic_long;
+typedef uintptr_t atomic_ulong;
+//atomic_llong
+//atomic_ullong
+typedef uintptr_t atomic_char16_t;
+typedef uintptr_t atomic_char32_t;
+typedef uintptr_t atomic_wchar_t;
+typedef intptr_t atomic_int_least8_t;
+typedef uintptr_t atomic_uint_least8_t;
+typedef intptr_t atomic_int_least16_t;
+typedef uintptr_t atomic_uint_least16_t;
+typedef intptr_t atomic_int_least32_t;
+typedef uintptr_t atomic_uint_least32_t;
+//atomic_int_least64_t
+//atomic_uint_least64_t
+typedef intptr_t atomic_int_fast8_t;
+typedef uintptr_t atomic_uint_fast8_t;
+typedef intptr_t atomic_int_fast16_t;
+typedef uintptr_t atomic_uint_fast16_t;
+typedef intptr_t atomic_int_fast32_t;
+typedef uintptr_t atomic_uint_fast32_t;
+//atomic_int_fast64_t
+//atomic_uint_fast64_t
+typedef intptr_t atomic_intptr_t;
+typedef uintptr_t atomic_uintptr_t;
+typedef uintptr_t atomic_size_t;
+typedef intptr_t atomic_ptrdiff_t;
+//atomic_intmax_t
+//atomic_uintmax_t
# define atomic_store(object,desired) \
do { \
# define atomic_flag_clear_explicit(object,order) \
atomic_flag_clear(object)
+# else
+
+/*** No atomics ***/
+
+# 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
+
+typedef uintptr_t atomic_generic_t;
+typedef atomic_generic_t atomic_flag;
+typedef atomic_generic_t atomic_bool;
+//typedef atomic_generic_t atomic_char;
+//typedef atomic_generic_t atomic_schar;
+typedef atomic_generic_t atomic_uchar;
+//typedef atomic_generic_t atomic_short;
+typedef atomic_generic_t atomic_ushort;
+//typedef atomic_generic_t atomic_int;
+typedef atomic_generic_t atomic_uint;
+//typedef atomic_generic_t atomic_long;
+typedef atomic_generic_t atomic_ulong;
+//typedef atomic_generic_t atomic_llong;
+//typedef atomic_generic_t atomic_ullong;
+//typedef atomic_generic_t atomic_char16_t;
+//typedef atomic_generic_t atomic_char32_t;
+//typedef atomic_generic_t atomic_wchar_t;
+//typedef atomic_generic_t atomic_int_least8_t;
+typedef atomic_generic_t atomic_uint_least8_t;
+//typedef atomic_generic_t atomic_int_least16_t;
+typedef atomic_generic_t atomic_uint_least16_t;
+//typedef atomic_generic_t atomic_int_least32_t;
+typedef atomic_generic_t atomic_uint_least32_t;
+//typedef atomic_generic_t atomic_int_least64_t;
+//typedef atomic_generic_t atomic_uint_least64_t;
+//typedef atomic_generic_t atomic_int_fast8_t;
+typedef atomic_generic_t atomic_uint_fast8_t;
+//typedef atomic_generic_t atomic_int_fast16_t;
+typedef atomic_generic_t atomic_uint_fast16_t;
+//typedef atomic_generic_t atomic_int_fast32_t;
+typedef atomic_generic_t atomic_uint_fast32_t;
+//typedef atomic_generic_t atomic_int_fast64_t
+//typedef atomic_generic_t atomic_uint_fast64_t;
+//typedef atomic_generic_t atomic_intptr_t;
+typedef atomic_generic_t atomic_uintptr_t;
+typedef atomic_generic_t atomic_size_t;
+//typedef atomic_generic_t atomic_ptrdiff_t;
+//typedef atomic_generic_t atomic_intmax_t;
+//typedef atomic_generic_t atomic_uintmax_t;
+
+#define atomic_store(object,desired) \
+ do { \
+ vlc_global_lock(VLC_ATOMIC_MUTEX); \
+ *(object) = (desired); \
+ vlc_global_unlock(VLC_ATOMIC_MUTEX); \
+ } while (0)
+
+# define atomic_store_explicit(object,desired,order) \
+ atomic_store(object,desired)
+
+static inline uintptr_t atomic_load(atomic_generic_t *object)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_load_explicit(object,order) \
+ atomic_load(object)
+
+static inline
+uintptr_t atomic_exchange(atomic_generic_t *object, uintptr_t desired)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object = desired;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_exchange_explicit(object,desired,order) \
+ atomic_exchange(object,desired)
+
+static inline
+bool vlc_atomic_compare_exchange(atomic_generic_t *object,
+ uintptr_t *expected, uintptr_t desired)
+{
+ bool ret;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ ret = *object == *expected;
+ if (ret)
+ *object = desired;
+ else
+ *expected = *object;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return ret;
+}
+# define atomic_compare_exchange_strong(object,expected,desired) \
+ vlc_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) \
+ vlc_atomic_compare_exchange(object, expected, desired)
+# define atomic_compare_exchange_weak_explicit(object,expected,desired,order) \
+ atomic_compare_exchange_weak(object, expected, desired)
+
+static inline
+uintmax_t atomic_fetch_add(atomic_generic_t *object, uintptr_t operand)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object += operand;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_fetch_add_explicit(object,operand,order) \
+ atomic_fetch_add(object,operand)
+
+static inline
+uintptr_t atomic_fetch_sub(atomic_generic_t *object, uintptr_t operand)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object -= operand;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_fetch_sub_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+static inline
+uintptr_t atomic_fetch_or(atomic_generic_t *object, uintptr_t operand)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object |= operand;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_fetch_or_explicit(object,operand,order) \
+ atomic_fetch_or(object,operand)
+
+static inline
+uintptr_t atomic_fetch_xor(atomic_generic_t *object, uintptr_t operand)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object ^= operand;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# define atomic_fetch_xor_explicit(object,operand,order) \
+ atomic_fetch_sub(object,operand)
+
+static inline
+uintptr_t atomic_fetch_and(atomic_generic_t *object, uintptr_t operand)
+{
+ uintptr_t value;
+
+ vlc_global_lock(VLC_ATOMIC_MUTEX);
+ value = *object;
+ *object &= operand;
+ vlc_global_unlock(VLC_ATOMIC_MUTEX);
+ return value;
+}
+# 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)
+
# 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(const vlc_atomic_t *atom)
+static inline uintptr_t vlc_atomic_get(vlc_atomic_t *atom)
{
return atomic_load(&atom->u);
}
static inline uintptr_t vlc_atomic_compare_swap(vlc_atomic_t *atom,
uintptr_t u, uintptr_t v)
{
- return atomic_compare_exchange_strong(&atom->u, &u, v);
+ atomic_compare_exchange_strong(&atom->u, &u, v);
+ return u;
}
/** 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_getf(vlc_atomic_t *atom)
{
union { float f; uintptr_t i; } u;
u.i = vlc_atomic_get(atom);
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