__pthread_mutex_lock_full on Linux

[CaiusTSM]

Hi, I got this runtime error when trying to run the sokol_app.h example code on Manjaro x86_64.

The trace-back in GDB:

a.out: ../nptl/pthread_mutex_lock.c:428: __pthread_mutex_lock_full: Assertion `e != ESRCH || !robust' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff7c1d615 in raise () from /usr/lib/libc.so.6
(gdb) backtrace
#0  0x00007ffff7c1d615 in raise () from /usr/lib/libc.so.6
#1  0x00007ffff7c06862 in abort () from /usr/lib/libc.so.6
#2  0x00007ffff7c06747 in __assert_fail_base.cold () from /usr/lib/libc.so.6
#3  0x00007ffff7c15bf6 in __assert_fail () from /usr/lib/libc.so.6
#4  0x00007ffff77e44d4 in __pthread_mutex_lock_full () from /usr/lib/libpthread.so.0
#5  0x00007ffff7e7c9d4 in ?? () from /usr/lib/libX11.so.6
#6  0x00007ffff7e85389 in XQueryExtension () from /usr/lib/libX11.so.6
#7  0x00007ffff7e78884 in XInitExtension () from /usr/lib/libX11.so.6
#8  0x00007ffff7a44463 in ?? () from /usr/lib/libGLX_mesa.so.0
#9  0x00007ffff7a454ee in ?? () from /usr/lib/libGLX_mesa.so.0
#10 0x0000555555558e4d in _sapp_glx_init () at src/sokol_app.h:8499
#11 0x000055555555b076 in _sapp_linux_run (desc=0x7fffffffe0e0) at src/sokol_app.h:9337
#12 0x000055555555b24c in main (argc=1, argv=0x7fffffffe278) at src/sokol_app.h:9382

The code used was the example code from the README (with OpenGL core 33 selected):

#define SOKOL_IMPL
#define SOKOL_GLCORE33
#include "sokol_app.h"
#include "sokol_gfx.h"
#include "sokol_glue.h"

sg_pass_action pass_action;

void init(void) {
    sg_setup(&(sg_desc){
        .context = sapp_sgcontext()
    });
    pass_action = (sg_pass_action) {
        .colors[0] = { .action=SG_ACTION_CLEAR, .val={1.0f, 0.0f, 0.0f, 1.0f} }
    };
}

void frame(void) {
    float g = pass_action.colors[0].val[1] + 0.01f;
    pass_action.colors[0].val[1] = (g > 1.0f) ? 0.0f : g;
    sg_begin_default_pass(&pass_action, sapp_width(), sapp_height());
    sg_end_pass();
    sg_commit();
}

void cleanup(void) {
    sg_shutdown();
}

sapp_desc sokol_main(int argc, char* argv[]) {
    return (sapp_desc){
        .init_cb = init,
        .frame_cb = frame,
        .cleanup_cb = cleanup,
        .width = 400,
        .height = 300,
        .window_title = "Clear (sokol app)",
    };
}

Compiled with:
gcc src/*.c -o build/a.out -ldl -lX11 -lXi -lXcursor -lGL

[floooh]

Hmm, hard to say what's wrong there to be honest, sokol_app.h is not multithreaded anywhere, so that's somewhere inside the GLX implementation. The X11/GLX initialization code should be identical to GLFW. Do you know if GLFW applications work on that machine?

[floooh]

...ah wait! I think I know what's wrong. See this issue:

#376

Specifically this comment:

#376 (comment)

You need to compile with -pthread (note that this is different than -lpthread)

[CaiusTSM]

Linking to pthread seems to have fixed it. Both -lpthread and -pthread seem to work. I am now compiling with: gcc src/*.c -o build/a.out -pthread -ldl -lX11 -lXi -lXcursor -lGL. Thank you for the quick response.