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

  pshared   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 location 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:

  0	    Successful completion.

  [EINVAL]  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

Index for Section 3

Alphabetical listing for P

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