diff options
Diffstat (limited to 'kern/spinlock.h')
| -rw-r--r-- | kern/spinlock.h | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/kern/spinlock.h b/kern/spinlock.h index 3060aaa6..f0243e77 100644 --- a/kern/spinlock.h +++ b/kern/spinlock.h @@ -73,7 +73,8 @@ void spinlock_init(struct spinlock *lock); * * Return 0 on success, EBUSY if the spin lock is already locked. * - * Preemption is disabled on success. + * If the operation succeeds, prior calls to spinlock_unlock on the same + * spin lock synchronize with this operation. */ static inline int spinlock_trylock(struct spinlock *lock) @@ -98,7 +99,8 @@ spinlock_trylock(struct spinlock *lock) * * A spin lock can only be locked once. * - * This function disables preemption. + * Prior calls to spinlock_unlock on the same spin lock synchronize with + * this operation. */ static inline void spinlock_lock(struct spinlock *lock) @@ -112,8 +114,6 @@ spinlock_lock(struct spinlock *lock) * * The spin lock must be locked, and must have been locked on the same * processor it is unlocked on. - * - * This function may reenable preemption. */ static inline void spinlock_unlock(struct spinlock *lock) @@ -132,9 +132,11 @@ spinlock_unlock(struct spinlock *lock) * * Return 0 on success, EBUSY if the spin lock is already locked. * - * Preemption and interrupts are disabled on success, in which case the - * flags passed by the caller are filled with the previous value of the - * CPU flags. + * Interrupts are disabled on success, in which case the flags passed + * by the caller are filled with the previous value of the CPU flags. + * + * If the operation succeeds, prior calls to spinlock_unlock on the same + * spin lock synchronize with this operation. */ static inline int spinlock_trylock_intr_save(struct spinlock *lock, unsigned long *flags) |