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pthread_rwlock_unlock ()
  • >> pthread_rwlock_unlock (3) ( Solaris man: Библиотечные вызовы )
  • pthread_rwlock_unlock (3) ( FreeBSD man: Библиотечные вызовы )
  • pthread_rwlock_unlock (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    pthread_rwlock_unlock - unlock read-write lock object
     
    

    SYNOPSIS

    cc -mt [ flag... ] file... -lpthread [ library... ]
    #include <pthread.h>
    
    int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);
    

     

    DESCRIPTION

    The pthread_rwlock_unlock() function is called to release a lock held on the read-write lock object referenced by rwlock. Results are undefined if the read-write lock rwlock is not held by the calling thread.

    If this function is called to release a read lock from the read-write lock object and there are other read locks currently held on this read-write lock object, the read-write lock object remains in the read locked state. If this function releases the calling thread's last read lock on this read-write lock object, then the calling thread is no longer one of the owners of the object. If this function releases the last read lock for this read-write lock object, the read-write lock object will be put in the unlocked state with no owners.

    If this function is called to release a write lock for this read-write lock object, the read-write lock object will be put in the unlocked state with no owners.

    If the call to the pthread_rwlock_unlock() function results in the read-write lock object becoming unlocked and there are multiple threads waiting to acquire the read-write lock object for writing, the scheduling policy is used to determine which thread acquires the read-write lock object for writing. If there are multiple threads waiting to acquire the read-write lock object for reading, the scheduling policy is used to determine the order in which the waiting threads acquire the read-write lock object for reading. If there are multiple threads blocked on rwlock for both read locks and write locks, it is unspecified whether the readers acquire the lock first or whether a writer acquires the lock first.

    Results are undefined if any of these functions are called with an uninitialized read-write lock.  

    RETURN VALUES

    If successful, the pthread_rwlock_unlock() function returns 0. Otherwise, an error number is returned to indicate the error.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    pthread_rwlock_init(3C), pthread_rwlock_rdlock(3C), pthread_rwlock_wrlock(3C), pthread_rwlockattr_init(3C), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ATTRIBUTES
    SEE ALSO


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