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libs: add atomic xxx_and_fetch apis

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We have the fetch_and_xxx apis, which return the _old_ value;
adding the xxx_and_fetch versions, which return the new value.

Signed-off-by: Mark Stapp <mjs@voltanet.io>
This commit is contained in:
Mark Stapp 2018-08-28 12:48:58 -04:00
parent 9c42f07ccb
commit b086e4672a
1 changed files with 36 additions and 0 deletions
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36
lib/frratomic.h
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@ -49,6 +49,11 @@
#define atomic_fetch_and_explicit __atomic_fetch_and
#define atomic_fetch_or_explicit __atomic_fetch_or
#define atomic_add_fetch_explicit __atomic_add_fetch
#define atomic_sub_fetch_explicit __atomic_sub_fetch
#define atomic_and_fetch_explicit __atomic_and_fetch
#define atomic_or_fetch_explicit __atomic_or_fetch
#define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, \
mem2) \
__atomic_compare_exchange_n(atom, expect, desire, 1, mem1, mem2)
@ -137,6 +142,7 @@
*_expect = rval; \
ret; \
})
#define atomic_fetch_and_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
@ -152,6 +158,36 @@
rval; \
})
#define atomic_add_fetch_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_add_and_fetch((ptr), (val)); \
__sync_synchronize(); \
rval; \
})
#define atomic_sub_fetch_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_sub_and_fetch((ptr), (val)); \
__sync_synchronize(); \
rval; \
})
#define atomic_and_fetch_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_and_and_fetch(ptr, val); \
__sync_synchronize(); \
rval; \
})
#define atomic_or_fetch_explicit(ptr, val, mem) \
({ \
__sync_synchronize(); \
typeof(*ptr) rval = __sync_or_and_fetch(ptr, val); \
__sync_synchronize(); \
rval; \
})
#else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */
#error no atomic functions...
#endif