Help for gdk threads and fork with execlp needed

[günther <guenther rapp-informatik de>]

I serached but found no answer,

why does a simple fork and an following execlp call does not work
if threads are activ

switch ( pid = fork() ) {
case -1:  printf("fork errori\n");
           break;
case 0:         /* this is the son process */
         execlp("xterm", (char *) 0);      /* test for exec failed if
threads are active
                                              with no threads all OK */
         _exit(0);                         /* should never reach */
default:
        printf("I am the father \n");
}

Is for this problem a vfork or _clone  neccesary

Thanks for help

günther
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