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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-11 22:24:16 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-11 22:24:16 +0200 |
| commit | 14897e35fdc045fff9baabf0354570da22386706 (patch) | |
| tree | 32cf1fcd7696e2018a05f2e4f8d5d20166af21ab /include | |
| parent | Fix "$(AS) -traditional" compile breakage caused by asmlinkage_protect (diff) | |
| parent | Add additional examples in Documentation/spinlocks.txt (diff) | |
| download | linux-14897e35fdc045fff9baabf0354570da22386706.tar.xz linux-14897e35fdc045fff9baabf0354570da22386706.zip | |
Merge branch 'docs' of git://git.lwn.net/linux-2.6
* 'docs' of git://git.lwn.net/linux-2.6:
Add additional examples in Documentation/spinlocks.txt
Move sched-rt-group.txt to scheduler/
Documentation: move rpc-cache.txt to filesystems/
Documentation: move nfsroot.txt to filesystems/
Spell out behavior of atomic_dec_and_lock() in kerneldoc
Fix a typo in highres.txt
Fixes to the seq_file document
Fill out information on patch tags in SubmittingPatches
Add the seq_file documentation
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/spinlock.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 576a5f77d3bd..1129ee0a7180 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -341,6 +341,9 @@ static inline void double_spin_unlock(spinlock_t *l1, spinlock_t *l2, * atomic_dec_and_lock - lock on reaching reference count zero * @atomic: the atomic counter * @lock: the spinlock in question + * + * Decrements @atomic by 1. If the result is 0, returns true and locks + * @lock. Returns false for all other cases. */ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); #define atomic_dec_and_lock(atomic, lock) \ |