pthread_mutexattr_getpshared(3) [osf1 man page]

pthread_mutexattr_getpshared(3) 			     Library Functions Manual				   pthread_mutexattr_getpshared(3)

NAME

       pthread_mutexattr_getpshared - Obtains the process-shared attribute of a mutex attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int   pthread_mutexattr_getpshared(
			     const pthread_mutexattr_t	     *attr,
			     int			     *pshared);

PARAMETERS

       Address of the mutex attributes object whose process-shared attribute is to be obtained.  Location to store the value of the process-shared
       attribute of attr.

DESCRIPTION

       This routine obtains the value of the process-shared attribute in the mutex attributes object referenced by attr and stores it at the loca-
       tion pshared. The object referenced by attr must be initialized before this routine is called.

       Setting	the  process-shared  attribute	to  PTHREAD_PROCESS_PRIVATE permits a mutex to be operated upon by threads created within the same
       process as the thread that initialized the mutex.  If threads of differing processes attempt to operate on such a mutex,  the  behavior	is
       undefined.

       The default value of the process-shared attribute of a mutex attributes object is PTHREAD_PROCESS_PRIVATE.

       Setting	the  process-shared  attribute	to PTHREAD_PROCESS_SHARED permits a mutex to be operated upon by any thread that has access to the
       memory where the mutex is allocated, even if the mutex is allocated in memory that is shared by multiple programs.

RETURN VALUES

       If an error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are  as  follows:
       Successful completion.  The value specified by attr is not a valid attributes object.

ERRORS

       None

RELATED INFORMATION

       Functions: pthread_mutexattr_setpshared(3), pthread_mutexattr_init(3)

       Manuals: Guide to DECthreads and Programmer's Guide delim off

														   pthread_mutexattr_getpshared(3)

PTHREAD_MUTEXATTR_GETPSHARED(P) 			     POSIX Programmer's Manual				   PTHREAD_MUTEXATTR_GETPSHARED(P)

NAME

       pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get and set the process-shared attribute

SYNOPSIS

       #include <pthread.h>

       int pthread_mutexattr_getpshared(const pthread_mutexattr_t *
	      restrict attr, int *restrict pshared);
       int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
	      int pshared);

DESCRIPTION

       The pthread_mutexattr_getpshared() function shall obtain the value of the process-shared attribute from the attributes object referenced by
       attr. The pthread_mutexattr_setpshared() function shall set the process-shared attribute in an initialized attributes object referenced	by
       attr.

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

RETURN VALUE

       Upon  successful completion, pthread_mutexattr_setpshared() shall return zero; otherwise, an error number shall be returned to indicate the
       error.

       Upon successful completion, pthread_mutexattr_getpshared() shall return zero and store the value of the process-shared  attribute  of  attr
       into the object referenced by the pshared parameter. Otherwise, an error number shall be returned to indicate the error.

ERRORS

       The pthread_mutexattr_getpshared() and pthread_mutexattr_setpshared() functions may fail if:

       EINVAL The value specified by attr is invalid.

       The pthread_mutexattr_setpshared() function may fail if:

       EINVAL The new value specified for the attribute is outside the range of legal values for that attribute.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_cond_destroy()  ,  pthread_create()  ,  pthread_mutex_destroy()	,  pthread_mutexattr_destroy()	,  the	Base Definitions volume of
       IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003					   PTHREAD_MUTEXATTR_GETPSHARED(P)