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Linux 2.6 - man page for pthread_condattr_setpshared (linux section 3posix)

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

NAME
       pthread_condattr_getpshared,  pthread_condattr_setpshared - get and set the process-shared
       condition variable attributes

SYNOPSIS
       #include <pthread.h>

       int pthread_condattr_getpshared(const pthread_condattr_t *restrict attr,
	      int *restrict pshared);
       int pthread_condattr_setpshared(pthread_condattr_t *attr,
	      int pshared);

DESCRIPTION
       The pthread_condattr_getpshared() function shall obtain the value  of  the  process-shared
       attribute from the attributes object referenced by attr. The pthread_condattr_setpshared()
       function shall set the process-shared attribute in an initialized attributes object refer-
       enced by attr.

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

RETURN VALUE
       If successful, the pthread_condattr_setpshared() function shall return zero; otherwise, an
       error number shall be returned to indicate the error.

       If  successful, the pthread_condattr_getpshared() function 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_condattr_getpshared() and pthread_condattr_setpshared() functions may fail if:

       EINVAL The value specified by attr is invalid.

       The pthread_condattr_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_create()    ,	pthread_cond_destroy()	   ,	 pthread_condattr_destroy()	,
       pthread_mutex_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 Technology  --  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003		   PTHREAD_CONDATTR_GETPSHARED(P)


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