pthread_rwlockattr_setpshared(3)

NAME

pthread_rwlockattr_setpshared - set the process shared at

tribute

LIBRARY

library ``libc_r'' library ``libpthread'' library ``libthr''

SYNOPSIS

#include <pthread.h>
int
pthread_rwlockattr_setpshared(pthread_rwlockattr_t    *attr,
int pshared);

DESCRIPTION

The pthread_rwlockattr_setpshared() function sets the pro

cess shared
attribute of attr to the value referenced by pshared. The

pshared argument may be one of two values:

PTHREAD_PROCESS_SHARED Any thread of any process that has

access to the

memory where the read/write lock

resides can
manipulate the lock.

PTHREAD_PROCESS_PRIVATE Only threads created within the

same process as

the thread that initialized the

read/write lock
can manipulate the lock. This is

the default
value.

RETURN VALUES

If successful, the pthread_rwlockattr_setpshared() function

will return
zero. Otherwise an error number will be returned to indi

cate the error.

ERRORS

The pthread_rwlockattr_setpshared() function will fail if:

[EINVAL] The value specified by attr or pshared is

invalid.

SEE ALSO

pthread_rwlockattr_getpshared(3), pthread_rwlockat

tr_init(3),
pthread_rwlock_init(3)

STANDARDS

The pthread_rwlockattr_setpshared() function is expected to

conform to
Version 2 of the Single UNIX Specification (``SUSv2'').

HISTORY

The pthread_rwlockattr_setpshared() function first appeared

in
FreeBSD 3.0.

BUGS

The PTHREAD_PROCESS_SHARED attribute is not supported.

BSD August 4, 1998

BSD