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PTHREAD_RWLOCKATTR(3)      Library Functions Manual      PTHREAD_RWLOCKATTR(3)

NAME
     pthread_rwlockattr_init, pthread_rwlockattr_destroy,
     pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared -
     initialize, destroy or query read/write lock attributes

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlockattr_init(pthread_rwlockattr_t *attr);

     int
     pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);

     int
     pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *__restrict attr,
         int * __restrict pshared);

     int
     pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared);

DESCRIPTION
     The pthread_rwlockattr_init() function is used to initialize a read/write
     lock attributes object.

     The pthread_rwlockattr_destroy() function is used to destroy a read/write
     lock attribute object previously created with pthread_rwlockattr_init().

     The pthread_rwlockattr_getpshared() function shall obtain the value of
     process-shared attribute from the initialized attributes object
     referenced by attr.

     The pthread_rwlockattr_setpshared() function shall set the process-shared
     attribute in an initialized attributes object referenced by attr.

RETURN VALUES
     If successful, all these functions return zero.  Otherwise an error
     number will be returned to indicate the error.

ERRORS
     pthread_rwlockattr_init() shall fail if:

     [ENOMEM]           Insufficient memory exists to initialize the
                        read/write lock attributes object.

     pthread_rwlockattr_init() and pthread_rwlockattr_destroy() may fail if:

     [EINVAL]           The value specified by attr is invalid.

     pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() may
     fail if:

     [EINVAL]           The value specified by attr is invalid.

SEE ALSO
     pthread_rwlock_init(3)

STANDARDS
     Both functions conform to IEEE Std 1003.1-2001 ("POSIX.1").

BUGS
     The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared()
     functions are hidden by default since only thread shared attributes are
     supported.

NetBSD 10.99                     June 12, 2016                    NetBSD 10.99