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Add atomic_sub_* functions to libspl.

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Both the SPL and the ZFS libspl export most of the atomic_* functions,
except atomic_sub_* functions which are only exported by the SPL, not by
libspl. This patch remedies that by implementing atomic_sub_* functions
in libspl.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1013
This commit is contained in:
Etienne Dechamps
2012-06-27 10:26:49 +02:00
committed by Brian Behlendorf
parent 82f46731fd
commit 142e6dd100
4 changed files with 284 additions and 0 deletions
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lib/libspl/include/atomic.h
+30
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@@ -78,6 +78,21 @@ extern void atomic_add_long(volatile ulong_t *, long);
extern void atomic_add_64(volatile uint64_t *, int64_t);
#endif
/*
* Substract delta from target
*/
extern void atomic_sub_8(volatile uint8_t *, int8_t);
extern void atomic_sub_char(volatile uchar_t *, signed char);
extern void atomic_sub_16(volatile uint16_t *, int16_t);
extern void atomic_sub_short(volatile ushort_t *, short);
extern void atomic_sub_32(volatile uint32_t *, int32_t);
extern void atomic_sub_int(volatile uint_t *, int);
extern void atomic_sub_ptr(volatile void *, ssize_t);
extern void atomic_sub_long(volatile ulong_t *, long);
#if defined(_INT64_TYPE)
extern void atomic_sub_64(volatile uint64_t *, int64_t);
#endif
/*
* logical OR bits with target
*/
@@ -157,6 +172,21 @@ extern ulong_t atomic_add_long_nv(volatile ulong_t *, long);
extern uint64_t atomic_add_64_nv(volatile uint64_t *, int64_t);
#endif
/*
* Substract delta from target
*/
extern uint8_t atomic_sub_8_nv(volatile uint8_t *, int8_t);
extern uchar_t atomic_sub_char_nv(volatile uchar_t *, signed char);
extern uint16_t atomic_sub_16_nv(volatile uint16_t *, int16_t);
extern ushort_t atomic_sub_short_nv(volatile ushort_t *, short);
extern uint32_t atomic_sub_32_nv(volatile uint32_t *, int32_t);
extern uint_t atomic_sub_int_nv(volatile uint_t *, int);
extern void *atomic_sub_ptr_nv(volatile void *, ssize_t);
extern ulong_t atomic_sub_long_nv(volatile ulong_t *, long);
#if defined(_INT64_TYPE)
extern uint64_t atomic_sub_64_nv(volatile uint64_t *, int64_t);
#endif
/*
* logical OR bits with target and return new value.
*/