diff options
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/atomics.h | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/compat/atomics.h b/compat/atomics.h index 14f0f2720f..56328ab354 100644 --- a/compat/atomics.h +++ b/compat/atomics.h @@ -16,17 +16,47 @@ * with mpv. If not, see <http://www.gnu.org/licenses/>. */ -// At this point both gcc and clang had __sync_synchronize support for some -// time. We only support a full memory barrier. +#ifndef MP_ATOMICS_H +#define MP_ATOMICS_H +#include <inttypes.h> #include "config.h" +#if HAVE_STDATOMIC +#include <stdatomic.h> +#else + +// Emulate the parts of C11 stdatomic.h needed by mpv. +// Still relies on gcc/clang atomic builtins. + +typedef struct { volatile unsigned long v; } atomic_ulong; +typedef struct { volatile int v; } atomic_int; +typedef struct { volatile _Bool v; } atomic_bool; +typedef struct { volatile long long v; } atomic_llong; +typedef struct { volatile uint_least32_t v; } atomic_uint_least32_t; +typedef struct { volatile unsigned long long v; } atomic_ullong; + +#define ATOMIC_VAR_INIT(x) \ + {.v = (x)} +#define atomic_load(p) \ + (mp_memory_barrier(), (p)->v) +#define atomic_store(p, val) \ + ((p)->v = (val), mp_memory_barrier()) + #if HAVE_ATOMIC_BUILTINS -# define mp_memory_barrier() __atomic_thread_fence(__ATOMIC_SEQ_CST) -# define mp_atomic_add_and_fetch(a, b) __atomic_add_fetch(a, b,__ATOMIC_SEQ_CST) +# define mp_memory_barrier() \ + __atomic_thread_fence(__ATOMIC_SEQ_CST) +# define atomic_fetch_add(a, b) \ + __atomic_add_fetch(&(a)->v, b, __ATOMIC_SEQ_CST) #elif HAVE_SYNC_BUILTINS -# define mp_memory_barrier() __sync_synchronize() -# define mp_atomic_add_and_fetch(a, b) __sync_add_and_fetch(a, b) +# define mp_memory_barrier() \ + __sync_synchronize() +# define atomic_fetch_add(a, b) \ + (__sync_add_and_fetch(&(a)->v, b), mp_memory_barrier()) #else # error "this should have been a configuration error, report a bug please" #endif + +#endif /* else HAVE_STDATOMIC */ + +#endif |