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author | Jim Jagielski <jim@apache.org> | 2018-09-17 15:50:19 +0000 |
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committer | Jim Jagielski <jim@apache.org> | 2018-09-17 15:50:19 +0000 |
commit | b155af5a01c14480b67207002cb98d3f348ffcb4 (patch) | |
tree | 7006f85b322faed66142e0ba26717cd8540535ef /include/apr_atomic.h | |
parent | 8060737d702ccfebcdb7cbb42e0e51118a72e46f (diff) | |
download | apr-b155af5a01c14480b67207002cb98d3f348ffcb4.tar.gz |
Add in Atomics for 64bit ints
git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1841078 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'include/apr_atomic.h')
-rw-r--r-- | include/apr_atomic.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/include/apr_atomic.h b/include/apr_atomic.h index 4e7879000..7ac9aafc6 100644 --- a/include/apr_atomic.h +++ b/include/apr_atomic.h @@ -113,6 +113,73 @@ APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint3 */ APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val); +/* + * Atomic operations on 64-bit values + * Note: Each of these functions internally implements a memory barrier + * on platforms that require it + */ + +/** + * atomically read an apr_uint64_t from memory + * @param mem the pointer + */ +APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem); + +/** + * atomically set an apr_uint64_t in memory + * @param mem pointer to the object + * @param val value that the object will assume + */ +APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val); + +/** + * atomically add 'val' to an apr_uint64_t + * @param mem pointer to the object + * @param val amount to add + * @return old value pointed to by mem + */ +APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val); + +/** + * atomically subtract 'val' from an apr_uint64_t + * @param mem pointer to the object + * @param val amount to subtract + */ +APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val); + +/** + * atomically increment an apr_uint64_t by 1 + * @param mem pointer to the object + * @return old value pointed to by mem + */ +APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem); + +/** + * atomically decrement an apr_uint64_t by 1 + * @param mem pointer to the atomic value + * @return zero if the value becomes zero on decrement, otherwise non-zero + */ +APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem); + +/** + * compare an apr_uint64_t's value with 'cmp'. + * If they are the same swap the value with 'with' + * @param mem pointer to the value + * @param with what to swap it with + * @param cmp the value to compare it to + * @return the old value of *mem + */ +APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with, + apr_uint64_t cmp); + +/** + * exchange an apr_uint64_t's value with 'val'. + * @param mem pointer to the value + * @param val what to swap it with + * @return the old value of *mem + */ +APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val); + /** * compare the pointer's value with cmp. * If they are the same swap the value with 'with' |