PTHREAD_RWLOCKATTR_SETPSHARED(3) |
FreeBSD Library Functions Manual |
PTHREAD_RWLOCKATTR_SETPSHARED(3) |
NAME
pthread_rwlockattr_setpshared —
set the process shared attribute
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include < pthread.h>
int
pthread_rwlockattr_setpshared( pthread_rwlockattr_t *attr, int pshared);
DESCRIPTION
The
pthread_rwlockattr_setpshared() function sets the process 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 indicate the error.
ERRORS
The
pthread_rwlockattr_setpshared() function will fail if:
-
[
EINVAL]
-
The value specified by
attr or
pshared is invalid.
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.