Re: wxt term + osx

[Jun T. <tak...@kb...>]

The reason why the current wxt on Mac is single-threaded is
documented in the following:
http://sourceforge.net/p/gnuplot/patches/544/
In short, on Mac (or at least with Cocoa), the GUI loop
need be in the main thread.

A multi-threded wxt would be better, but "single-threaded"
does not necessarily mean that it does not work.

But there seems to be another problem.
At line 4022 and below in wxt_gui.cpp (in wxt_atexit()),
gnuplot fork() and the parent exits, while the child continues
running. But "fork() without exec()" is not recommended on Mac.
See, for example,
http://stackoverflow.com/questions/18854708/why-is-it-prohivited-to-use-fork-without-exec-in-mac

If I comment out the line 4041:

       freopen("/dev/null","w",stderr);

then I get lots of the following message:

 The process has forked and you cannot use this CoreFoundation \
 functionality safely. You MUST exec()

If I #undef HAVE_WORKING_FORK then the problem that the
wxt window is closed immediately after it is opened seeks
to be fixed. For example the followings work as expected:

$ cat test.plt | gnuplot -d
$ gnuplot -d test.plt < /dev/null
(where test.plot contains
 set term wxt; plot something; pause mouse close)

But then the plot window is not closed also at the end of

$ make check	# i.e., check-noninteractive

and I need to manually close it. So it's not the complete
solution.