Hello.
I've been trying to reuse the mlgame codebase, and I've encountered a
weird issue. When linked into native code or into bytecode, the library
works fine, and the system exits with a 0 errorlevel.
However, when trying to #require the package from the toploop, I get the
following error.
yziq...@seldon:~/git/mlgame$ ocaml
Objective Caml version 3.11.1
# #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads
- : unit = ()
# #require "mlgame";;
/usr/lib/ocaml/unix.cma: loaded
/usr/lib/ocaml/bigarray.cma: loaded
/usr/lib/ocaml/sdl: added to search path
/usr/lib/ocaml/sdl/sdl.cma: loaded
/usr/lib/ocaml/sdl/sdlloader.cma: loaded
/usr/local/lib/ocaml/3.11.1/mlgame: added to search path
/usr/local/lib/ocaml/3.11.1/mlgame/mlgame.cma: loaded
[Debug][Video] Driver: x11 Hardware: false HWBlit: false HWBlitCK:
false WHBlitAlpha: false HWFill: false Mem: 0
# Fatal error: exception Sys_blocked_io
yziq...@seldon:~/git/mlgame$
I am wondering how to use a debugger with libraries in the toplevel. As
/usr/bin/ocaml is bytecode and that the exception is raised from OCaml
and not from C code, I do not have a backtrace:
yziq...@seldon:~$ gdb --args ocamlrun /usr/bin/ocaml
GNU gdb (GDB) 7.0-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show
copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/ocamlrun...(no debugging symbols
found)...done.
(gdb) run
Starting program: /usr/bin/ocamlrun /usr/bin/ocaml
[Thread debugging using libthread_db enabled]
Objective Caml version 3.11.1
# #use "topfind";;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads
- : unit = ()
# #require "mlgame";;
/usr/lib/ocaml/unix.cma: loaded
/usr/lib/ocaml/bigarray.cma: loaded
/usr/lib/ocaml/sdl: added to search path
/usr/lib/ocaml/sdl/sdl.cma: loaded
/usr/lib/ocaml/sdl/sdlloader.cma: loaded
/usr/local/lib/ocaml/3.11.1/mlgame: added to search path
/usr/local/lib/ocaml/3.11.1/mlgame/mlgame.cma: loaded
[New Thread 0x7ffff34c0910 (LWP 32029)]
[Debug][Video] Driver: x11 Hardware: false HWBlit: false HWBlitCK:
false WHBlitAlpha: false HWFill: false Mem: 0
# Fatal error: exception Sys_blocked_io
[Thread 0x7ffff34c0910 (LWP 32029) exited]
Program exited with code 02.
(gdb) bt
No stack.
(gdb)
My humble guess is that there is a IO conflict with the toplevel's
interactive write/read on stdin/stdout, but I'd like to know how to
trace that.
All the best,
--
Guillaume Yziquel
http://yziquel.homelinux.org/
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