I’m new to both Julia and c. I hope what I’m trying to do makes sense! The general idea is to try to use the enlightenment foundation libraries (enlightenment.org) to build UI’s for julia code, so will need to call both ways, c functions from julia and julia functions from c. Baby steps first!
I have the following:
Julia code:
#! /usr/bin/env julia
module juliaProcess
function process()
for i=1:5
println("i is "*string(i))
end
end
export process
end
c code:
#define EFL_BETA_API_SUPPORT 1
#include <Efl_Ui.h>
#include <julia.h>
#include <stdio.h>
JULIA_DEFINE_FAST_TLS
static void
_gui_quit_cb(void *data EINA_UNUSED, const Efl_Event *event EINA_UNUSED)
{
efl_exit(0);
}
static void
_gui_setup()
{
Eo *win, *box;
win = efl_add(EFL_UI_WIN_CLASS, efl_main_loop_get(),
efl_ui_win_type_set(efl_added, EFL_UI_WIN_TYPE_BASIC),
efl_text_set(efl_added, "Hello World"),
efl_ui_win_autodel_set(efl_added, EINA_TRUE));
efl_event_callback_add(win, EFL_UI_WIN_EVENT_DELETE_REQUEST, _gui_quit_cb, NULL);
box = efl_add(EFL_UI_BOX_CLASS, win,
efl_content_set(win, efl_added),
efl_gfx_hint_size_min_set(efl_added, EINA_SIZE2D(360, 240)));
efl_add(EFL_UI_TEXTBOX_CLASS, box,
efl_text_markup_set(efl_added, "Hello World. This is an <b>Efl.Ui</b> application!"),
efl_text_interactive_selection_allowed_set(efl_added, EINA_FALSE),
efl_gfx_hint_weight_set(efl_added, 1.0, 0.9),
efl_gfx_hint_align_set(efl_added, 0.5, 0.5),
efl_pack(box, efl_added));
efl_add(EFL_UI_BUTTON_CLASS, box,
efl_text_set(efl_added, "Quit"),
efl_gfx_hint_weight_set(efl_added, 1.0, 0.1),
efl_pack(box, efl_added),
efl_event_callback_add(efl_added, EFL_INPUT_EVENT_CLICKED,
_gui_quit_cb, efl_added));
}
void julia_main()
{
jl_init();
jl_eval_string("Base,include(Main, \"juliaProcess\")");
jl_eval_string("using Main.juliaProcess");
jl_module_t* juliaProcess = (jl_module_t*)jl_eval_string("Main.juliaProcess");
//jl_function_t* processfn = jl_get_function(juliaProcess, "process");
//jl_value_t* pa = jl_call0(processfn);
/* run Julia commands */
jl_eval_string("println(sqrt(2.0))");
jl_atexit_hook(0);
}
EAPI_MAIN void
efl_main(void *data EINA_UNUSED, const Efl_Event *ev EINA_UNUSED)
{
_gui_setup();
julia_main();
}
EFL_MAIN()
I created a pkg-config julia.pc file and then compiled the c code with:
gcc -o efltest efltest.c `pkg-config --cflags --libs eina efl elementary julia`
This compiles and runs and I see a small demo app in a window on my ubuntu desktop as expected. The println(sqrt(2.0)) displays the expected result. The problem comes when I uncomment the following line:
jl_function_t* processfn = jl_get_function(juliaProcess, "process");
I get a seg fault:
[52270] signal (11.1): Segmentation fault
in expression starting at none:0
jl_get_module_binding at /cache/build/builder-amdci5-1/julialang/julia-release-1-dot-10/src/module.c:721
jl_resolve_owner at /cache/build/builder-amdci5-1/julialang/julia-release-1-dot-10/src/module.c:379 [inlined]
ijl_get_binding at /cache/build/builder-amdci5-1/julialang/julia-release-1-dot-10/src/module.c:464
ijl_get_global at /cache/build/builder-amdci5-1/julialang/julia-release-1-dot-10/src/module.c:775
jl_get_function at ./efltest (unknown line)
julia_main at ./efltest (unknown line)
efl_main at ./efltest (unknown line)
_event_callback_call at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
efl_event_callback_call at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
_efl_loop_arguments_send at /usr/local/lib/x86_64-linux-gnu/libecore.so.1 (unknown line)
_efl_future_cb at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
_eina_future_cb_dispatch at /usr/local/lib/x86_64-linux-gnu/libeina.so.1 (unknown line)
_eina_future_dispatch at /usr/local/lib/x86_64-linux-gnu/libeina.so.1 (unknown line)
_eina_future_dispatch at /usr/local/lib/x86_64-linux-gnu/libeina.so.1 (unknown line)
_futures_dispatch_cb at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
_event_callback_call at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
efl_event_callback_call at /usr/local/lib/x86_64-linux-gnu/libeo.so.1 (unknown line)
_ecore_main_loop_iterate_internal at /usr/local/lib/x86_64-linux-gnu/libecore.so.1 (unknown line)
_ecore_main_loop_begin at /usr/local/lib/x86_64-linux-gnu/libecore.so.1 (unknown line)
_efl_loop_begin at /usr/local/lib/x86_64-linux-gnu/libecore.so.1 (unknown line)
efl_loop_begin at /usr/local/lib/x86_64-linux-gnu/libecore.so.1 (unknown line)
main at ./efltest (unknown line)
unknown function (ip: 0x7a946d829d8f)
__libc_start_main at /lib/x86_64-linux-gnu/libc.so.6 (unknown line)
_start at ./efltest (unknown line)
Allocations: 2907 (Pool: 2899; Big: 8); GC: 0
Any help or pointers to potential issues will be gratefully received.
Also, if it is straight forward to call into the c code from Julia an example of how I might achieve that so that I can update the ui in near real time would be really helpful.
Thanks again, and I hope this is the right place to post this question.