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1. Mutex£¨»¥³â£©
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#include <linux/mutex.h>
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DEFINE_MUTEX(name);»òÕß
void mutex_init(struct mutex *lock);
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void mutex_lock (struct mutex *lock);
Tries to lock the mutex, sleeps otherwise.
Caution: can't be interrupted, resulting in processes you cannot kill!
int mutex_lock_interruptible (struct mutex *lock);
Same, but can be interrupted. If interrupted, returns a non zero value and doesn't hold the lock. Test the return value!!!
int mutex_trylock (struct mutex *lock);
Never waits. Returns a non zero value if the mutex is not available.int mutex_is_locked(struct mutex *lock);Just tells whether the mutex is locked or not.
void mutex_unlock (struct mutex *lock);
Releases the lock. Make sure you do it as quickly as possible!
2. Reader/writer semphopres ¶ÁдÐźÅÁ¿
Allow shared access by unlimited readers, or by only 1 writer. Writers get priority.
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void init_rwsem (struct rw_semaphore *sem);
void down_read (struct rw_semaphore *sem);
int down_read_trylock (struct rw_semaphore *sem);
int up_read (struct rw_semaphore *sem);
void down_write (struct rw_semaphore *sem);
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