Re: [Gc] child process goes to crash when the program invokes gtk_init

Dear Mr. Maidanski and Mr. Matheussen,
Thanks a lot for your response. I'm sorry that I forgot to call GC_INIT at very beginning of the program.
I inserted them into and tested again the next program:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <gtk/gtk.h>
#include <sys/wait.h>

#define GC_DEBUG
#include <gc.h>

char *
copy (const char *str)
{
    char *p = NULL;
    if (!str) return NULL;
    if ((p = GC_MALLOC_ATOMIC(strlen(str) + 1)))
        (void) strcpy(p, str);
    return(p);
}


int main(int argc, char** argv)
{
    pid_t pid;
    int status;
    char *teststr = "This is a test string.";
    char *c1, *c2;

    GC_set_handle_fork(1);
    GC_INIT();

    c1 = copy(teststr);
    printf ("adress:%p activesize:%d\n", c1, (int)GC_size(c1));
    
    gtk_init(&argc, &argv);

    pid = fork();
    if (pid == 0) {
	c2 = copy ("another test str");

	printf ("adress:%p activesize:%d\n", c1, (int)GC_size(c1));
	printf ("%s\n", c1);

	_exit(0);
    }
    waitpid (pid, &status, 0);
    if (WIFSIGNALED(status)){
	fprintf(stderr, "child signal %d\n", WTERMSIG(status));
    }
    return (0);
}

The result becomes perfect!
$ ./a.exe
adress:0x600060fe0 activesize:64
adress:0x600060fe0 activesize:64
This is a test string.

I greatly appriciate your helps!

Sincerely yours,
Yoichi Niitsu

From: Ivan Maidanski [mailto:[email protected]] 
Sent: Thursday, August 06, 2015 6:55 AM
To: [email protected]
Cc: [email protected]; niitsu yoichi(新津 陽一郎 ○ＭＳジ□ＭＳ設○ＡＩ設)
Subject: Re[2]: [Gc] child process goes to crash when the program invokes gtk_init

Hi,

And call GC_set_handle_fork(1) before GC_INIT().

I assume you use bdwgc master

Среда, 5 августа 2015, 18:11 +02:00 от Kjetil Matheussen <[email protected]>:

gtk is gtk+-2.24.28.
I have fears in using boehm-gc together with gtk+-2.0. Does anyone give me comments/advices ?
Thanks in advance.

Hi,

I've used gtk with boehm-gc in a quite large program before without problems, but not in cygwin, only mingw/osx/linux.
And I didn't fork either. I don't know how forking works in cygwin (think I remember reading something about fork
being impossible to emulate in Windows, but maybe that is not true anymore), and I also don't know if there
is anything (in general) to look out for when forking in a bdwgc program.

But maybe your program works if you just call GC_INIT() right after main?


_______________________________________________
bdwgc mailing list
[email protected]
https://lists.opendylan.org/mailman/listinfo/bdwgc

_______________________________________________
bdwgc mailing list
[email protected]
https://lists.opendylan.org/mailman/listinfo/bdwgc