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-
- Notes on the new X11 features are attached.
-
- Ed
- ----------------------------------
- Ed Kubaitis (ejk@ux2.cso.uiuc.edu)
- Computing & Communications Services Office - University of Illinois, Urbana
-
- ===============================================================================
- Gnuplot_x11 for 3.2
- -------------------
-
- New features
- ------------
- o CRIPPLED_SELECT build option for SVR3 platforms with incomplete
- or faulty implementations of BSD select().
-
- o Xlib only
-
- X11 support no longer requires Athena or Motif libraries and
- include files. This makes life easier for people on platforms
- with Open Look only. It also simplifies X11 tailoring on all
- platforms. Oh yes, and the gnuplot_x11 executable is smaller
- (~43K instead of ~500K on RS/6000.)
-
- makefile.unx has been edited to remove references to Athena &
- Motif. Also, with the exception of the HP definition (where it
- appeared to be intentionally specific to R4) all references to
- X11R4 have also been removed since this version should work without
- changes on R3, R4, or R5.
-
- o Grayscale handling
-
- * grayscale displays get monochrome rendering by default
-
- * '-gray' option & resource forces grayscale rendering on grayscale
- or color displays.
-
- * '-mono' option forces monochrome rendering on color displays.
-
- * special grayscale resources (separate from color)
-
- o Miscellaneous
-
- * By default, the window is no longer momentarily cleared when
- a new plot is displayed. The new plot "silently" replaces the
- previous one. I found this useful when running some of the demos,
- such as contours.demo, where a plot "adds" a feature to
- the one before (gnuplot "movies" anyone?;-).
-
- However, a "-clear" command line-option and "gnuplot*clear: on"
- restores the momentary clear that was there previously.
-
- * Added ptx_x11 and convex_x11 machine options to makefile.unx.
-
- * There is an X11FLAGS option (-DOLD_SELECT) for old 4.2 BSD systems
- (such as SunOS 3.5) which don't have the FD_XXX macros that
- go with select().
-
-
- A few words about CRIPPLED_SELECT
- ---------------------------------
- I closely reviewed four different ways people had devised for dealing with
- the "select error" problem encountered on some SVR3 platforms. I had one
- such platform (Sequent Dynix/PTX) available for testing. Unfortunately 3 of
- the four ways that had been submitted did not work for PTX (which has
- problems with non-blocking I/O and Unix domain sockets as well as select).
- The fourth way worked there but it used SV STREAMS and I had no way to
- verify that it would also work on all the other platforms that encountered
- the problem.
-
- What was done instead was to use a temporary file instead of a pipe for
- gnuplot->gnuplot_x11 communication when CRIPPLED_SELECT is used. This is
- like a sledgehammer - crude but (hopefully) robust. It should work on any
- platform with open(), read(), write(), close(), unlink(), getpid(), and
- getppid().
-
- Response time is not bad with CRIPPLED_SELECT. Timings on an RS/6000
- for all.demo (hitting RETURN as soon as a plot appears) indicate that
- CRIPPLED_SELECT only adds an average of .5 seconds to response time,
- about what one would expect given the 1 second timer used. And curiously,
- CRIPPLED_SELECT used 30% less CPU than the default mode.
-
- Testing
- -------
- The new gnuplot_x11 was tested here on the following platforms:
-
- o IBM RS/6000 AIX 3.1.6 (IBM X11R3)
- o IBM RS/6000 AIX 3.1.6 (MIT X11R4)
- o Apollo 400s DomainOS 10.3 (Apollo X11R3)
- o Sun SPARC SunOS 4.1.1-GFX-Rev2 (X11R?)
- o Vax BSD 4.3 Reno (X11R5)
- o Vax Ultrix-32 V3.0 Rev 64 (MIT X11R4)
- o Sun 3/50 SunOS 3.5 (MIT X11R4)
- o Sun 3/60 SunOS 4.1 (MIT X11R4)
- o NeXT (X11 R?)
- o Convex C2 9.0 OS (MIT X11R5)
- o Sequent Dynix 3.1 (MIT X11R5)
- o Sequent Dynix/PTX (MIT X11R5)
- o Cray 2 - Unicos 5+?
- o Cray Y-MP - Unicos 5+?
-
- And with the following servers:
-
- o NCD 19 monochrome (NCD X11R3)
- o Visual X-15 monochrome (Visual X11R4)
- o Sun 3/50 monochrome (MIT X11R4)
- o IBM XStation 120 grayscale (IBM X11R4)
- o Visual Turbo X-19 grayscale (Visual X11R4)
- o IBM XStation 120 color (IBM X11R4)
- o Sun 3/60 color (MIT X11R4)
- o IBM XStation 130 1.3 (IBM X11R4)
-
-