method

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Ruby latest stable (v2_5_5) - 0 notes - Class: Continuation

[](*args) public

Invokes the continuation. The program continues from the end of the callcc block. If no arguments are given, the original callcc returns nil. If one argument is given, callcc returns it. Otherwise, an array containing args is returned.

callcc {|cont|  cont.call }           #=> nil
callcc {|cont|  cont.call 1 }         #=> 1
callcc {|cont|  cont.call 1, 2, 3 }   #=> [1, 2, 3]

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static VALUE
rb_cont_call(int argc, VALUE *argv, VALUE contval)
{
    rb_context_t *cont;
    rb_thread_t *th = GET_THREAD();
    GetContPtr(contval, cont);

    if (cont_thread_value(cont) != th->self) {
        rb_raise(rb_eRuntimeError, "continuation called across threads");
    }
    if (cont->saved_ec.protect_tag != th->ec->protect_tag) {
        rb_raise(rb_eRuntimeError, "continuation called across stack rewinding barrier");
    }
    if (cont->saved_ec.fiber_ptr) {
        if (th->ec->fiber_ptr != cont->saved_ec.fiber_ptr) {
            rb_raise(rb_eRuntimeError, "continuation called across fiber");
        }
    }
    rollback_ensure_stack(contval, th->ec->ensure_list, cont->ensure_array);

    cont->argc = argc;
    cont->value = make_passing_arg(argc, argv);

    cont_restore_0(cont, &contval);
    return Qnil; /* unreachable */
}

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