Standard C Library Functions          pthreadrwlockattrinit(3C)



NAME
     pthreadrwlockattrinit, pthreadrwlockattrdestroy  -  ini-
     tialize or destroy read-write lock attributes object

SYNOPSIS
     cc -mt [ flag... ] file... -lpthread [ library... ]
     #include 

     int pthreadrwlockattrinit(pthreadrwlockattrt *attr);


     int pthreadrwlockattrdestroy(pthreadrwlockattrt *attr);


DESCRIPTION
     The pthreadrwlockattrinit() function initializes  a  read-
     write lock attributes object attr with the default value for
     all of the attributes defined by the implementation.


     Results are undefined if pthreadrwlockattrinit() is called
     specifying an already initialized read-write lock attributes
     object.


     After a read-write lock attributes object has been  used  to
     initialize  one  or  more  read-write  locks,  any  function
     affecting the attributes object (including destruction) does
     not affect any previously initialized read-write locks.


     The pthreadrwlockattrdestroy() function destroys  a  read-
     write  lock  attributes object. The effect of subsequent use
     of  the  object  is  undefined  until  the  object  is   re-
     initialized by another call to pthreadrwlockattrinit(). An
     implementation can cause pthreadrwlockattrdestroy() to set
     the object referenced by attr to an invalid value.

RETURN VALUES
     If    successful,    the    pthreadrwlockattrinit()    and
     pthreadrwlockattrdestroy()  functions return 0. Otherwise,
     an error number is returned to indicate the error.

ERORS
     The pthreadrwlockattrinit() function will fail if:

     ENOMEM    Insufficient  memory  exists  to  initialize   the
               read-write lock attributes object.







SunOS 5.11          Last change: 23 Mar 2005                    1






Standard C Library Functions          pthreadrwlockattrinit(3C)



     The pthreadrwlockattrdestroy() function may fail if:

     EINVAL    The value specified by attr is invalid.


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     MT-Safe                     
    


SEE ALSO
     pthreadrwlockinit(3C),          pthreadrwlockrdlock(3C),
     pthreadrwlockunlock(3C),        pthreadrwlockwrlock(3C),
     pthreadrwlockattrgetpshared(3C),   attributes(5),    stan-
     dards(5)






























SunOS 5.11          Last change: 23 Mar 2005                    2