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author | Yann Ylavic <ylavic@apache.org> | 2021-10-29 15:09:13 +0000 |
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committer | Yann Ylavic <ylavic@apache.org> | 2021-10-29 15:09:13 +0000 |
commit | 942f42c4346068d00001bdd7d09be44ec93b7725 (patch) | |
tree | b2400a4aaa87811a08a2e89e8a84a67e3e1c11fe /atomic | |
parent | f4fc2cafd527f434e9824cb25eeb4615abe0c4f9 (diff) | |
download | apr-942f42c4346068d00001bdd7d09be44ec93b7725.tar.gz |
apr_atomic: Use __atomic builtins when available.
Unlike Intel's atomic builtins (__sync_*), the more recent __atomic builtins
provide atomic load and store for weakly ordered architectures like ARM32 or
powerpc[64], so use them when available (gcc 4.6.3+).
git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1894621 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'atomic')
-rw-r--r-- | atomic/unix/builtins.c | 56 | ||||
-rw-r--r-- | atomic/unix/builtins64.c | 38 | ||||
-rw-r--r-- | atomic/unix/mutex.c | 2 |
3 files changed, 84 insertions, 12 deletions
diff --git a/atomic/unix/builtins.c b/atomic/unix/builtins.c index ebf8833d1..d0f1b454c 100644 --- a/atomic/unix/builtins.c +++ b/atomic/unix/builtins.c @@ -25,57 +25,97 @@ APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_load_n(mem, __ATOMIC_SEQ_CST); +#else return *mem; +#endif } APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) { +#if HAVE__ATOMIC_BUILTINS + __atomic_store_n(mem, val, __ATOMIC_SEQ_CST); +#else *mem = val; +#endif } APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_fetch_add(mem, val, __ATOMIC_SEQ_CST); +#else return __sync_fetch_and_add(mem, val); +#endif } APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) { +#if HAVE__ATOMIC_BUILTINS + __atomic_fetch_sub(mem, val, __ATOMIC_SEQ_CST); +#else __sync_fetch_and_sub(mem, val); +#endif } APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_fetch_add(mem, 1, __ATOMIC_SEQ_CST); +#else return __sync_fetch_and_add(mem, 1); +#endif } APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_sub_fetch(mem, 1, __ATOMIC_SEQ_CST); +#else return __sync_sub_and_fetch(mem, 1); +#endif } -APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, +APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t val, apr_uint32_t cmp) { - return __sync_val_compare_and_swap(mem, cmp, with); +#if HAVE__ATOMIC_BUILTINS + __atomic_compare_exchange_n(mem, &cmp, val, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + return cmp; +#else + return __sync_val_compare_and_swap(mem, cmp, val); +#endif } APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_exchange_n(mem, val, __ATOMIC_SEQ_CST); +#else __sync_synchronize(); - return __sync_lock_test_and_set(mem, val); +#endif } -APR_DECLARE(void*) apr_atomic_casptr(void *volatile *mem, void *with, const void *cmp) +APR_DECLARE(void*) apr_atomic_casptr(void *volatile *mem, void *ptr, const void *cmp) { - return (void*) __sync_val_compare_and_swap(mem, cmp, with); +#if HAVE__ATOMIC_BUILTINS + __atomic_compare_exchange_n(mem, (void **)&cmp, ptr, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + return (void *)cmp; +#else + return (void *)__sync_val_compare_and_swap(mem, (void *)cmp, ptr); +#endif } -APR_DECLARE(void*) apr_atomic_xchgptr(void *volatile *mem, void *with) +APR_DECLARE(void*) apr_atomic_xchgptr(void *volatile *mem, void *ptr) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_exchange_n(mem, ptr, __ATOMIC_SEQ_CST); +#else __sync_synchronize(); - - return (void*) __sync_lock_test_and_set(mem, with); + return __sync_lock_test_and_set(mem, ptr); +#endif } #endif /* USE_ATOMICS_BUILTINS */ diff --git a/atomic/unix/builtins64.c b/atomic/unix/builtins64.c index 4a4b685c7..0ac950c15 100644 --- a/atomic/unix/builtins64.c +++ b/atomic/unix/builtins64.c @@ -20,45 +20,77 @@ APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_load_n(mem, __ATOMIC_SEQ_CST); +#else return *mem; +#endif } APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val) { +#if HAVE__ATOMIC_BUILTINS + __atomic_store_n(mem, val, __ATOMIC_SEQ_CST); +#else *mem = val; +#endif } APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_fetch_add(mem, val, __ATOMIC_SEQ_CST); +#else return __sync_fetch_and_add(mem, val); +#endif } APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val) { +#if HAVE__ATOMIC_BUILTINS + __atomic_fetch_sub(mem, val, __ATOMIC_SEQ_CST); +#else __sync_fetch_and_sub(mem, val); +#endif } APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_fetch_add(mem, 1, __ATOMIC_SEQ_CST); +#else return __sync_fetch_and_add(mem, 1); +#endif } APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_sub_fetch(mem, 1, __ATOMIC_SEQ_CST); +#else return __sync_sub_and_fetch(mem, 1); +#endif } -APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with, +APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t val, apr_uint64_t cmp) { - return __sync_val_compare_and_swap(mem, cmp, with); +#if HAVE__ATOMIC_BUILTINS + __atomic_compare_exchange_n(mem, &cmp, val, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + return cmp; +#else + return __sync_val_compare_and_swap(mem, cmp, val); +#endif } APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val) { +#if HAVE__ATOMIC_BUILTINS + return __atomic_exchange_n(mem, val, __ATOMIC_SEQ_CST); +#else __sync_synchronize(); - return __sync_lock_test_and_set(mem, val); +#endif } #endif /* USE_ATOMICS_BUILTINS */ diff --git a/atomic/unix/mutex.c b/atomic/unix/mutex.c index 78ad75336..b9d1cedc9 100644 --- a/atomic/unix/mutex.c +++ b/atomic/unix/mutex.c @@ -89,7 +89,7 @@ static APR_INLINE apr_thread_mutex_t *mutex_hash(volatile apr_uint32_t *mem) APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) { - return apr__atomic_generic64_init(p); + return APR_SUCCESS; } #endif /* APR_HAS_THREADS */ |