void-packages/srcpkgs/apr/patches/atomic64.patch
q66 8e41df8389 apr: use __atomic instead of __sync for builtins for 64-bit atomics
This allows us to use libatomic on architectures without native
support, unlike __sync.
2020-01-11 18:50:59 +01:00

56 lines
1.8 KiB
Diff

commit 69e9378eb86357d4361322256d5d5a39ff4a592d
Author: q66 <daniel@octaforge.org>
Date: Fri Jan 10 13:04:37 2020 +0100
use __atomic builtins instead of legacy __sync
This allows for 64-bit atomic ops on platforms that don't natively
support them such as armv6 and ppc32.
diff --git atomic/unix/builtins64.c atomic/unix/builtins64.c
index 4a4b685..90b5c5e 100644
--- atomic/unix/builtins64.c
+++ atomic/unix/builtins64.c
@@ -30,35 +30,34 @@ APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val)
APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
- return __sync_fetch_and_add(mem, val);
+ return __atomic_fetch_add(mem, val, __ATOMIC_SEQ_CST);
}
APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
- __sync_fetch_and_sub(mem, val);
+ __atomic_fetch_sub(mem, val, __ATOMIC_SEQ_CST);
}
APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem)
{
- return __sync_fetch_and_add(mem, 1);
+ return __atomic_fetch_add(mem, 1, __ATOMIC_SEQ_CST);
}
APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem)
{
- return __sync_sub_and_fetch(mem, 1);
+ return (int)__atomic_sub_fetch(mem, 1, __ATOMIC_SEQ_CST);
}
APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
apr_uint64_t cmp)
{
- return __sync_val_compare_and_swap(mem, cmp, with);
+ __atomic_compare_exchange_n(mem, &cmp, with, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
+ return cmp;
}
APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val)
{
- __sync_synchronize();
-
- return __sync_lock_test_and_set(mem, val);
+ return __atomic_exchange_n(mem, val, __ATOMIC_SEQ_CST);
}
#endif /* USE_ATOMICS_BUILTINS */