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https://git.proxmox.com/git/mirror_zfs
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9f4c835a0e
what I would call effecient but it does have the advantage of being correct which is all I need right now. I added a regression test as well. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@57 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
131 lines
2.3 KiB
C
131 lines
2.3 KiB
C
#ifndef _SPL_ATOMIC_H
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#define _SPL_ATOMIC_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <linux/module.h>
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#include <linux/spinlock.h>
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/* XXX: Serialize everything through global locks. This is
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* going to be bad for performance, but for now it's the easiest
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* way to ensure correct behavior. I don't like it at all.
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* It would be nicer to make these function to the atomic linux
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* functions, but the normal uint64_t type complicates this.
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*/
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extern spinlock_t atomic64_lock;
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extern spinlock_t atomic32_lock;
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extern spinlock_t atomic_lock;
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static __inline__ uint32_t
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atomic_add_32(volatile uint32_t *target, int32_t delta)
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{
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uint32_t rc;
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spin_lock(&atomic32_lock);
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rc = *target;
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*target += delta;
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spin_unlock(&atomic32_lock);
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return rc;
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}
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static __inline__ void
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atomic_inc_64(volatile uint64_t *target)
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{
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spin_lock(&atomic64_lock);
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(*target)++;
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spin_unlock(&atomic64_lock);
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}
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static __inline__ void
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atomic_dec_64(volatile uint64_t *target)
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{
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spin_lock(&atomic64_lock);
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(*target)--;
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spin_unlock(&atomic64_lock);
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}
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static __inline__ uint64_t
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atomic_add_64(volatile uint64_t *target, uint64_t delta)
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{
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uint64_t rc;
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spin_lock(&atomic64_lock);
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rc = *target;
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*target += delta;
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spin_unlock(&atomic64_lock);
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return rc;
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}
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static __inline__ uint64_t
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atomic_sub_64(volatile uint64_t *target, uint64_t delta)
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{
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uint64_t rc;
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spin_lock(&atomic64_lock);
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rc = *target;
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*target -= delta;
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spin_unlock(&atomic64_lock);
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return rc;
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}
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static __inline__ uint64_t
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atomic_add_64_nv(volatile uint64_t *target, uint64_t delta)
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{
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spin_lock(&atomic64_lock);
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*target += delta;
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spin_unlock(&atomic64_lock);
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return *target;
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}
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static __inline__ uint64_t
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atomic_sub_64_nv(volatile uint64_t *target, uint64_t delta)
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{
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spin_lock(&atomic64_lock);
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*target -= delta;
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spin_unlock(&atomic64_lock);
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return *target;
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}
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static __inline__ uint64_t
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atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
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uint64_t newval)
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{
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uint64_t rc;
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spin_lock(&atomic64_lock);
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rc = *target;
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if (*target == cmp)
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*target = newval;
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spin_unlock(&atomic64_lock);
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return rc;
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}
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static __inline__ void *
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atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
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{
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void *rc;
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spin_lock(&atomic_lock);
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rc = (void *)target;
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if (target == cmp)
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target = newval;
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spin_unlock(&atomic_lock);
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return rc;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SPL_ATOMIC_H */
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