Obtains the object name from a read-write lock object.

1  –  C Binding

    #include <pthread.h>

    int
    pthread_rwlock_getname_np (
             pthread_rwlock_t   *rwlock,
             char   *name,
             size_t   len);

2  –  Arguments

 rwlock

    Address of the read-write lock object whose object name is to be
    obtained.

 name

    Location to store the obtained object name.

 len

    Length in bytes of buffer at the location specified by name.

3  –  Description

    This routine copies the object name from the read-write lock
    object specified by rwlock to the buffer at the location name.
    Before calling this routine, your program must allocate the
    buffer indicated by name.

    The object name is a C language string and provides an identifier
    that is meaningful to a person debugging a multithreaded
    application. The maximum number of characters in the object name
    is 31.

    If the specified read-write lock object has not been previously
    set with an object name, this routine copies a C language null
    string into the buffer at location name.

4  –  Return Values

    If an error condition occurs, this routine returns an integer
    value indicating the type of error. Possible return values are as
    follows:

    Return      Description

    0           Successful completion.
    [EINVAL]    The value specified by rwlock is not a valid read-
                write lock.

5  –  Associated Routines

       pthread_rwlock_setname_np()