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Provide a function to downgrade a cglock from a write lock to an intermediate variant.

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This commit is contained in:
Con Kolivas 2013-09-29 15:14:06 +10:00
parent 5e1ebd5070
commit 5683a1144e
1 changed files with 9 additions and 2 deletions
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11
miner.h
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@ -843,7 +843,7 @@ static inline void cglock_init(cglock_t *lock)
rwlock_init(&lock->rwlock);
}
/* Read lock variant of cglock */
/* Read lock variant of cglock. Cannot be promoted. */
static inline void cg_rlock(cglock_t *lock)
{
mutex_lock(&lock->mutex);
@ -851,7 +851,8 @@ static inline void cg_rlock(cglock_t *lock)
mutex_unlock_noyield(&lock->mutex);
}
/* Intermediate variant of cglock */
/* Intermediate variant of cglock - behaves as a read lock but can be promoted
* to a write lock or demoted to read lock. */
static inline void cg_ilock(cglock_t *lock)
{
mutex_lock(&lock->mutex);
@ -878,6 +879,12 @@ static inline void cg_dwlock(cglock_t *lock)
mutex_unlock_noyield(&lock->mutex);
}
/* Demote a write variant to an intermediate variant */
static inline void cg_dwilock(cglock_t *lock)
{
wr_unlock(&lock->rwlock);
}
/* Downgrade intermediate variant to a read lock */
static inline void cg_dlock(cglock_t *lock)
{