https://github.com/torvalds/linux
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- v5.5
- v5.4-rc8
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- v5.2
- v5.19-rc8
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- v5.19-rc1
- v5.19
- v5.18-rc7
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- v5.18
- v5.17-rc8
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- v5.17-rc1
- v5.17
- v5.16-rc8
- v5.16-rc7
- v5.16-rc6
- v5.16-rc5
- v5.16-rc4
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- v5.16-rc1
- v5.16
- v5.15-rc7
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- v5.15-rc5
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- v5.15-rc1
- v5.15
- v5.14-rc7
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- v5.14-rc5
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- v5.14-rc2
- v5.14-rc1
- v5.14
- v5.13-rc7
- v5.13-rc6
- v5.13-rc5
- v5.13-rc4
- v5.13-rc3
- v5.13-rc2
- v5.13-rc1
- v5.13
- v5.12-rc8
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- v5.12-rc5
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- v5.12-rc3
- v5.12-rc2
- v5.12-rc1
- v5.12
- v5.11-rc7
- v5.11-rc6
- v5.11-rc5
- v5.11-rc4
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- v5.11-rc2
- v5.11-rc1
- v5.11
- v5.10-rc7
- v5.10-rc6
- v5.10-rc5
- v5.10-rc4
- v5.10-rc3
- v5.10-rc2
- v5.10-rc1
- v5.10
- v5.1-rc7
- v5.1-rc6
- v5.1-rc5
- v5.1-rc4
- v5.1-rc3
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- v5.1
- v5.0-rc8
- v5.0-rc7
- v5.0-rc6
- v5.0-rc5
- v5.0-rc4
- v5.0-rc3
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- v5.0
- v4.9-rc8
- v4.9-rc7
- v4.9-rc6
- v4.9-rc5
- v4.9-rc4
- v4.9-rc3
- v4.9-rc2
- v4.9-rc1
- v4.9
- v4.8-rc8
- v4.8-rc7
- v4.8-rc6
- v4.8-rc5
- v4.8-rc4
- v4.8-rc3
- v4.8-rc2
- v4.8-rc1
- v4.8
- v4.7-rc7
- v4.7-rc6
- v4.7-rc5
- v4.7-rc4
- v4.7-rc3
- v4.7-rc2
- v4.7-rc1
- v4.7
- v4.6-rc7
- v4.6-rc6
- v4.6-rc5
- v4.6-rc4
- v4.6-rc3
- v4.6-rc2
- v4.6-rc1
- v4.6
- v4.5-rc7
- v4.5-rc6
- v4.5-rc5
- v4.5-rc4
- v4.5-rc3
- v4.5-rc2
- v4.5-rc1
- v4.5
- v4.4-rc8
- v4.4-rc7
- v4.4-rc6
- v4.4-rc5
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- v4.4-rc3
- v4.4-rc2
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- v4.4
- v4.3-rc7
- v4.3-rc6
- v4.3-rc5
- v4.3-rc4
- v4.3-rc3
- v4.3-rc2
- v4.3-rc1
- v4.3
- v4.20-rc7
- v4.20-rc6
- v4.20-rc5
- v4.20-rc4
- v4.20-rc3
- v4.20-rc2
- v4.20-rc1
- v4.20
- v4.2-rc8
- v4.2-rc7
- v4.2-rc6
- v4.2-rc5
- v4.2-rc4
- v4.2-rc3
- v4.2-rc2
- v4.2-rc1
- v4.2
- v4.19-rc8
- v4.19-rc7
- v4.19-rc6
- v4.19-rc5
- v4.19-rc4
- v4.19-rc3
- v4.19-rc2
- v4.19-rc1
- v4.19
- v4.18-rc8
- v4.18-rc7
- v4.18-rc6
- v4.18-rc5
- v4.18-rc4
- v4.18-rc3
- v4.18-rc2
- v4.18-rc1
- v4.18
- v4.17-rc7
- v4.17-rc6
- v4.17-rc5
- v4.17-rc4
- v4.17-rc3
- v4.17-rc2
- v4.17-rc1
- v4.17
- v4.16-rc7
- v4.16-rc6
- v4.16-rc5
- v4.16-rc4
- v4.16-rc3
- v4.16-rc2
- v4.16-rc1
- v4.16
- v4.15-rc9
- v4.15-rc8
- v4.15-rc7
- v4.15-rc6
- v4.15-rc5
- v4.15-rc4
- v4.15-rc3
- v4.15-rc2
- v4.15-rc1
- v4.15
- v4.14-rc8
- v4.14-rc7
- v4.14-rc6
- v4.14-rc5
- v4.14-rc4
- v4.14-rc3
- v4.14-rc2
- v4.14-rc1
- v4.14
- v4.13-rc7
- v4.13-rc6
- v4.13-rc5
- v4.13-rc4
- v4.13-rc3
- v4.13-rc2
- v4.13-rc1
- v4.13
- v4.12-rc7
- v4.12-rc6
- v4.12-rc5
- v4.12-rc4
- v4.12-rc3
- v4.12-rc2
- v4.12-rc1
- v4.12
- v4.11-rc8
- v4.11-rc7
- v4.11-rc6
- v4.11-rc5
- v4.11-rc4
- v4.11-rc3
- v4.11-rc2
- v4.11-rc1
- v4.11
- v4.10-rc8
- v4.10-rc7
- v4.10-rc6
- v4.10-rc5
- v4.10-rc4
- v4.10-rc3
- v4.10-rc2
- v4.10-rc1
- v4.10
- v4.1-rc8
- v4.1-rc7
- v4.1-rc6
- v4.1-rc5
- v4.1-rc4
- v4.1-rc3
- v4.1-rc2
- v4.1-rc1
- v4.1
- v4.0-rc7
- v4.0-rc6
- v4.0-rc5
- v4.0-rc4
- v4.0-rc3
- v4.0-rc2
- v4.0-rc1
- v4.0
- v3.9-rc8
- v3.9-rc7
- v3.9-rc6
- v3.9-rc5
- v3.9-rc4
- v3.9-rc3
- v3.9-rc2
- v3.9-rc1
- v3.9
- v3.8-rc7
- v3.8-rc6
- v3.8-rc5
- v3.8-rc4
- v3.8-rc3
- v3.8-rc2
- v3.8-rc1
- v3.8
- v3.7-rc8
- v3.7-rc7
- v3.7-rc6
- v3.7-rc5
- v3.7-rc4
- v3.7-rc3
- v3.7-rc2
- v3.7-rc1
- v3.7
- v3.6-rc7
- v3.6-rc6
- v3.6-rc5
- v3.6-rc4
- v3.6-rc3
- v3.6-rc2
- v3.6-rc1
- v3.6
- v3.5-rc7
- v3.5-rc6
- v3.5-rc5
- v3.5-rc4
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- v3.5-rc1
- v3.5
- v3.4-rc7
- v3.4-rc6
- v3.4-rc5
- v3.4-rc4
- v3.4-rc3
- v3.4-rc2
- v3.4-rc1
- v3.4
- v3.3-rc7
- v3.3-rc6
- v3.3-rc5
- v3.3-rc4
- v3.3-rc3
- v3.3-rc2
- v3.3-rc1
- v3.3
- v3.2-rc7
- v3.2-rc6
- v3.2-rc5
- v3.2-rc4
- v3.2-rc3
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- v3.2-rc1
- v3.2
- v3.19-rc7
- v3.19-rc6
- v3.19-rc5
- v3.19-rc4
- v3.19-rc3
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- v3.19-rc1
- v3.19
- v3.18-rc7
- v3.18-rc6
- v3.18-rc5
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- v3.18
- v3.17-rc7
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- v3.17-rc5
- v3.17-rc4
- v3.17-rc3
- v3.17-rc2
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- v3.17
- v3.16-rc7
- v3.16-rc6
- v3.16-rc5
- v3.16-rc4
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- v3.16-rc1
- v3.16
- v3.15-rc8
- v3.15-rc7
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- v3.15-rc5
- v3.15-rc4
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- v3.15-rc2
- v3.15-rc1
- v3.15
- v3.14-rc8
- v3.14-rc7
- v3.14-rc6
- v3.14-rc5
- v3.14-rc4
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- v3.14
- v3.13-rc8
- v3.13-rc7
- v3.13-rc6
- v3.13-rc5
- v3.13-rc4
- v3.13-rc3
- v3.13-rc2
- v3.13-rc1
- v3.13
- v3.12-rc7
- v3.12-rc6
- v3.12-rc5
- v3.12-rc4
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- v3.12-rc2
- v3.12-rc1
- v3.12
- v3.11-rc7
- v3.11-rc6
- v3.11-rc5
- v3.11-rc4
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- v3.11-rc1
- v3.11
- v3.10-rc7
- v3.10-rc6
- v3.10-rc5
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- v3.10-rc3
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- v3.10
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- v3.0-rc7
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- v2.6.39-rc7
- v2.6.39-rc6
- v2.6.39-rc5
- v2.6.39-rc4
- v2.6.39-rc3
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- v2.6.39
- v2.6.38-rc8
- v2.6.38-rc7
- v2.6.38-rc6
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- v2.6.38-rc4
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- v2.6.38
- v2.6.37-rc8
- v2.6.37-rc7
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- v2.6.37
- v2.6.36-rc8
- v2.6.36-rc7
- v2.6.36-rc6
- v2.6.36-rc5
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- v2.6.36
- v2.6.35-rc6
- v2.6.35-rc5
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- v2.6.34-rc7
- v2.6.34-rc6
- v2.6.34-rc5
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- v2.6.33-rc8
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- v2.6.31-rc9
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- v2.6.16
- v2.6.15-rc7
- v2.6.15-rc6
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Tip revision: 3bedff1d73b86e0cf52634efb447e9ada08f2cc6 authored by Linus Torvalds on 20 November 2005, 03:25:03 UTC
Linux v2.6.15-rc2
Linux v2.6.15-rc2
Tip revision: 3bedff1
dec_and_lock.c
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
#include <asm/system.h>
#ifdef __HAVE_ARCH_CMPXCHG
/*
* This is an implementation of the notion of "decrement a
* reference count, and return locked if it decremented to zero".
*
* This implementation can be used on any architecture that
* has a cmpxchg, and where atomic->value is an int holding
* the value of the atomic (i.e. the high bits aren't used
* for a lock or anything like that).
*/
int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
int counter;
int newcount;
for (;;) {
counter = atomic_read(atomic);
newcount = counter - 1;
if (!newcount)
break; /* do it the slow way */
newcount = cmpxchg(&atomic->counter, counter, newcount);
if (newcount == counter)
return 0;
}
spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
spin_unlock(lock);
return 0;
}
#else
/*
* This is an architecture-neutral, but slow,
* implementation of the notion of "decrement
* a reference count, and return locked if it
* decremented to zero".
*
* NOTE NOTE NOTE! This is _not_ equivalent to
*
* if (atomic_dec_and_test(&atomic)) {
* spin_lock(&lock);
* return 1;
* }
* return 0;
*
* because the spin-lock and the decrement must be
* "atomic".
*
* This slow version gets the spinlock unconditionally,
* and releases it if it isn't needed. Architectures
* are encouraged to come up with better approaches,
* this is trivially done efficiently using a load-locked
* store-conditional approach, for example.
*/
int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
spin_unlock(lock);
return 0;
}
#endif
EXPORT_SYMBOL(_atomic_dec_and_lock);