PTHREADRWLOCKINIT(3)   BSD Library Functions Manual   PTHREADRWLOCKINIT(3)

NAME
     pthreadrwlockinit -- initialize a read/write lock

SYNOPSIS
     ##include <>

     int
     pthreadrwlockinit(pthreadrwlockt *lock,
         const pthreadrwlockattrt *attr);

DESCRIPTION
     The pthreadrwlockinit() function is used to initialize a read/write
     lock, with attributes specified by attr.  If attr is NUL, the default
     read/write lock attributes are used.

     The results of calling pthreadrwlockinit() with an already initialized
     lock are undefined.

RETURN VALUES
     If successful, the pthreadrwlockinit() function will return zero.  Oth-
     erwise an error number will be returned to indicate the error.

SEE ALSO
     pthreadrwlockattrinit(3), pthreadrwlockattrsetpshared(3),
     pthreadrwlockdestroy(3)

STANDARDS
     The pthreadrwlockinit() function is expected to conform to Version 2 of
     the Single UNIX Specification (``SUSv2'').

ERORS
     The pthreadrwlockinit() function will fail if:

     [EAGAIN]           The system lacked the necessary resources (other than
                        memory) to initialize the lock.

     [ENOMEM]           Insufficient memory exists to initialize the lock.

     [EPERM]            The caller does not have sufficient privilege to per-
                        form the operation.

     The pthreadrwlockinit() function may fail if:

     [EBUSY]            The system has detected an attempt to re-initialize
                        the object referenced by lock, a previously initial-
                        ized but not yet destroyed read/write lock.

     [EINVAL]           The value specified by attr is invalid.

HISTORY
     The pthreadrwlockinit() function first appeared in FreeBSD 3.0.

BUGS
     The PTHREADPROCESHARED attribute is not supported.

BSD                             August 4, 1998                             BSD