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| author | John Baldwin <jhb@FreeBSD.org> | 2005-09-27 17:39:11 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2005-09-27 17:39:11 +0000 |
| commit | 3c2bc2bf26924c35cace669bf4163670112ffe50 (patch) | |
| tree | 368df1c62ea6aa397797927efbf9c7ccc4b3b92e /sys/powerpc | |
| parent | 732c9a17013204144a82c8de5c63d26f8d07bb5d (diff) | |
| download | src-3c2bc2bf26924c35cace669bf4163670112ffe50.tar.gz src-3c2bc2bf26924c35cace669bf4163670112ffe50.zip | |
Add a new atomic_fetchadd() primitive that atomically adds a value to a
variable and returns the previous value of the variable.
Tested on: i386, alpha, sparc64, arm (cognet)
Reviewed by: arch@
Submitted by: cognet (arm)
MFC after: 1 week
Notes
Notes:
svn path=/head/; revision=150627
Diffstat (limited to 'sys/powerpc')
| -rw-r--r-- | sys/powerpc/include/atomic.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sys/powerpc/include/atomic.h b/sys/powerpc/include/atomic.h index 0bc8f2176b2b..9faa5bc94611 100644 --- a/sys/powerpc/include/atomic.h +++ b/sys/powerpc/include/atomic.h @@ -444,4 +444,17 @@ atomic_cmpset_rel_32(volatile uint32_t *p, uint32_t cmpval, uint32_t newval) #define atomic_cmpset_acq_ptr atomic_cmpset_acq_32 #define atomic_cmpset_rel_ptr atomic_cmpset_rel_32 +static __inline uint32_t +atomic_fetchadd_32(volatile uint32_t *p, uint32_t v) +{ + uint32_t value; + + do { + value = *p; + } while (!atomic_cmpset_32(p, value, value + v)); + return (value); +} + +#define atomic_fetchadd_int atomic_fetchadd_32 + #endif /* ! _MACHINE_ATOMIC_H_ */ |