SETRBUF(3PVM)							  PVM Version 3.4						     SETRBUF(3PVM)

NAME

       pvm_setrbuf - Switches the active receive buffer and saves the previous buffer.

SYNOPSIS

       C    int oldbuf = pvm_setrbuf( int bufid )

       Fortran	 call pvmfsetrbuf( bufid, oldbuf )

PARAMETERS

       bufid   Integer specifying the message buffer identifier for the new active receive buffer.

       oldbuf  Integer returning the message buffer identifier for the previous active receive buffer.

DESCRIPTION

       The  routine  pvm_setrbuf switches the active receive buffer to bufid and saves the previous active receive buffer oldbuf.  If bufid is set
       to 0 then the present active receive buffer is saved and no active receive buffer exists.

       A successful receive automatically creates a new active receive buffer.	If a previous receive has not been unpacked and needs to be  saved
       for later, then the previous bufid can be saved and reset later to the active buffer for unpacking.

       The  routine  is  required  when  managing multiple message buffers.  For example switching back and forth between two buffers.	One buffer
       could be used to send information to a graphical interface while a second buffer could be used send data to other tasks in the application.

EXAMPLES

       C:
	    rbuf1 = pvm_setrbuf( rbuf2 );

       Fortran:
	    CALL PVMFSETRBUF( NEWBUF, OLDBUF )

ERRORS

       These error conditions can be returned by pvm_setrbuf

       PvmBadParam
	      giving an invalid bufid.

       PvmNoSuchBuf
	      switching to a non-existent message buffer.

SEE ALSO

       pvm_setsbuf(3PVM)

								  30 August, 1993						     SETRBUF(3PVM)