-static void parent_do_garbage_collect(void)
-{
- int waiting_threads=0;
- struct thread *th;
- int status,p;
-
- for_each_thread(th) {
- if(ptrace(PTRACE_ATTACH,th->pid,0,0)) {
- perror("PTRACE_ATTACH");
- }
- else waiting_threads++;
- }
- stop_the_world=1;
-
- do {
- /* not sure if we have to wait for PTRACE_ATTACH to finish
- * before we can send PTRACE_CONT, so let's play it safe
- */
- while(waiting_threads>0) {
- if((p=waitpid(-1,&status, WUNTRACED|__WALL))>0) {
- if(WIFEXITED(status) || WIFSIGNALED(status))
- destroy_thread(find_thread_by_pid(p));
- else {
-#if 0
- fprintf(stderr, "wait returned pid %d signal %x\n",
- p,WSTOPSIG(status));
-#endif
- if(WSTOPSIG(status)==SIGTRAP) {
- if(ptrace(PTRACE_CONT,p,0,SIGTRAP))
- perror("PTRACE_CONT");
- }
- else waiting_threads--;
- }
- }
- }
- for_each_thread(th) {
- if(SymbolTlValue(PSEUDO_ATOMIC_ATOMIC,th)) {
- /* restart the child, setting *p-a-i* which will cause it
- * to go into interrupt_handle_pending as soon as it's
- * finished being pseudo_atomic. once there it will
- * signal itself SIGSTOP, which will give us another
- * event to wait for */
-#if 0
- fprintf(stderr, "%d was pseudo-atomic, letting it resume \n",
- th->pid);
-#endif
- SetTlSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,make_fixnum(1),th);
- if(ptrace(PTRACE_CONT,th->pid,0,0))
- perror("PTRACE_CONT");
- waiting_threads++;
- }
- }
- } while (waiting_threads>0);
-
- collect_garbage(maybe_gc_pending-1);
- maybe_gc_pending=0;
- stop_the_world=0;
- for_each_thread(th)
- if(ptrace(PTRACE_DETACH,th->pid,0,0))
- perror("PTRACE_DETACH");
-}