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| author | wm4 <wm4@nowhere> | 2017-01-27 09:15:32 +0100 |
|---|---|---|
| committer | wm4 <wm4@nowhere> | 2017-01-27 09:15:32 +0100 |
| commit | c3205d294e519f994829d9355eb133670729aab4 (patch) | |
| tree | 4d45fd4707338c836e9c6c74768e1b8e0234d562 /osdep | |
| parent | 70411f2709ed792df2fc66cd428e8253abfdc390 (diff) | |
| download | mpv-c3205d294e519f994829d9355eb133670729aab4.tar.bz2 mpv-c3205d294e519f994829d9355eb133670729aab4.tar.xz | |
atomic: drop __sync builtins
The correctness of the stdatomic.h emulation via the __sync builtins is
questionable, and we've been relying on exact stdatomic semantics for a
while, so just get rid of it. Compilers which support __sync but not
stdatomic.h will use to the slow mutex fallback.
Not sure about the __atomic builtins. It doesn't seem to harm either, so
leave it for now.
Diffstat (limited to 'osdep')
| -rw-r--r-- | osdep/atomic.h | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/osdep/atomic.h b/osdep/atomic.h index 9028a504eb..50f4f403da 100644 --- a/osdep/atomic.h +++ b/osdep/atomic.h @@ -61,25 +61,6 @@ typedef struct { volatile unsigned long long v; } atomic_ullong; __atomic_compare_exchange_n(&(a)->v, b, c, 0, __ATOMIC_SEQ_CST, \ __ATOMIC_SEQ_CST) -#elif HAVE_SYNC_BUILTINS - -#define atomic_load(p) \ - __sync_fetch_and_add(&(p)->v, 0) -#define atomic_store(p, val) \ - (__sync_synchronize(), (p)->v = (val), __sync_synchronize()) -#define atomic_fetch_add(a, b) \ - __sync_fetch_and_add(&(a)->v, b) -#define atomic_fetch_and(a, b) \ - __sync_fetch_and_and(&(a)->v, b) -#define atomic_fetch_or(a, b) \ - __sync_fetch_and_or(&(a)->v, b) -// Assumes __sync_val_compare_and_swap is "strong" (using the C11 meaning). -#define atomic_compare_exchange_strong(p, old, new) \ - ({ __typeof__((p)->v) val_ = __sync_val_compare_and_swap(&(p)->v, *(old), new); \ - bool ok_ = val_ == *(old); \ - if (!ok_) *(old) = val_; \ - ok_; }) - #elif defined(__GNUC__) #include <pthread.h> |