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

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_setp-
       shared() 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  unde-
       fined. 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_mutex-
       attr_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_MUTEXATTR_GETPSHARED(P)


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