pthread_rwlockattr_getpshared(3C)			   Standard C Library Functions 			 pthread_rwlockattr_getpshared(3C)

NAME

       pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get or set process-shared attribute of read-write lock attributes object

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ library... ]
       #include <pthread.h>

       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  process-shared  attribute  is  set	to   PTHREAD_PROCESS_SHARED to permit a read-write lock to be operated upon by any thread that has
       access to the memory where the read-write lock is allocated,  even if the read-write lock is allocated in memory that is shared by multiple
       processes.  If  the process-shared attribute is	PTHREAD_PROCESS_PRIVATE, the read-write lock will only be operated upon by threads created
       within the same process as the thread that initialised the read-write lock; if threads of differing processes attempt to operate on such  a
       read-write lock, the behaviour is undefined. The default value of the process-shared attribute is  PTHREAD_PROCESS_PRIVATE.

       The  pthread_rwlockattr_getpshared() function obtains the value of the process-shared attribute from the initialised attributes object ref-
       erenced by attr. The  pthread_rwlockattr_setpshared() function is used to set the process-shared attribute  in  an  initialised	attributes
       object referenced by attr.

RETURN VALUES

       If successful, the  pthread_rwlockattr_setpshared() function returns  0. Otherwise, an error number is returned to indicate the error.

       Upon  successful  completion,  the  pthread_rwlockattr_getpshared() returns  0 and stores the value of the process-shared attribute of attr
       into the object referenced by the pshared parameter. Otherwise an error number is returned to indicate the error.

ERRORS

       The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() functions will fail if:

       EINVAL	 The value specified by attr  or pshared is invalid.

ATTRIBUTES

       See  attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pthread_rwlock_init(3C),  pthread_rwlock_rdlock(3C),  pthread_rwlock_unlock(3C),  pthread_rwlock_wrlock(3C),   pthread_rwlockattr_init(3C),
       attributes(5), standards(5)

SunOS 5.11							    23 Mar 2005 				 pthread_rwlockattr_getpshared(3C)