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pthread_rwlock_trywrlock ()
  • >> pthread_rwlock_trywrlock (3) ( FreeBSD man: Библиотечные вызовы )
  • pthread_rwlock_trywrlock (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    pthread_rwlock_wrlock
    
     
    pthread_rwlock_trywrlock
    
     - acquire a read/write lock for writing
    
     
    

    LIBRARY

    Lb libpthread
    
     
    

    SYNOPSIS

       #include <pthread.h>
    int pthread_rwlock_wrlock (pthread_rwlock_t *lock);
    int pthread_rwlock_trywrlock (pthread_rwlock_t *lock);
     

    DESCRIPTION

    The pthread_rwlock_wrlock ();
    function blocks until a write lock can be acquired against Fa lock . The pthread_rwlock_trywrlock ();
    function performs the same action, but does not block if the lock cannot be immediately obtained.

    The results are undefined if the calling thread already holds the lock at the time the call is made.  

    IMPLEMENTATION NOTES

    To prevent writer starvation, writers are favored over readers.  

    RETURN VALUES

    If successful, the pthread_rwlock_wrlock ();
    and pthread_rwlock_trywrlock ();
    functions will return zero. Otherwise an error number will be returned to indicate the error.  

    ERRORS

    The pthread_rwlock_trywrlock ();
    function will fail if:

    Bq Er EBUSY
    The calling thread is not able to acquire the lock without blocking.

    The pthread_rwlock_wrlock ();
    and pthread_rwlock_trywrlock ();
    functions may fail if:

    Bq Er EDEADLK
    The calling thread already owns the read/write lock (for reading or writing).
    Bq Er EINVAL
    The value specified by Fa lock is invalid.
    Bq Er ENOMEM
    Insufficient memory exists to initialize the lock (applies to statically initialized locks only).

     

    SEE ALSO

    pthread_rwlock_init3, pthread_rwlock_rdlock3, pthread_rwlock_tryrdlock3, pthread_rwlock_unlock3  

    STANDARDS

    The pthread_rwlock_wrlock ();
    and pthread_rwlock_trywrlock ();
    functions are expected to conform to St -susv2 .  

    HISTORY

    The pthread_rwlock_wrlock ();
    function first appeared in Fx 3.0 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    IMPLEMENTATION NOTES
    RETURN VALUES
    ERRORS
    SEE ALSO
    STANDARDS
    HISTORY


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