// wake up the event loop, used when shutting down
static VALUE method_wake_event_loop_bang(VALUE self) {
FETCH_DATA_PTR(self, zk);
zkrb_debug_inst(self, "Waking event loop: %p", zk->queue);
zkrb_signal(zk->queue);
return Qnil;
};
static VALUE method_get_next_event(VALUE self, VALUE blocking) {
char buf[64];
FETCH_DATA_PTR(self, zk);
for (;;) {
// we use the is_running(self) method here because it allows us to have a
// ruby-land semaphore that we can also use in the java extension
//
if (is_closed(self) || !is_running(self)) {
zkrb_debug_inst(self, "is_closed(self): %d, is_running(self): %d, method_get_next_event is exiting loop", is_closed(self), is_running(self));
return Qnil; // this case for shutdown
}
zkrb_event_t *event = zkrb_dequeue(zk->queue, 1);
/* Wait for an event using rb_thread_select() on the queue's pipe */
if (event == NULL) {
if (NIL_P(blocking) || (blocking == Qfalse)) {
return Qnil; // no event for us
}
else {
int fd = zk->queue->pipe_read;
ssize_t bytes_read = 0;
// wait for an fd to become readable, opposite of rb_thread_fd_writable
rb_thread_wait_fd(fd);
bytes_read = read(fd, buf, sizeof(buf));
if (bytes_read == -1) {
rb_raise(rb_eRuntimeError, "read failed: %d", errno);
}
zkrb_debug_inst(self, "read %zd bytes from the queue (%p)'s pipe", bytes_read, zk->queue);
continue;
}
}
VALUE hash = zkrb_event_to_ruby(event);
zkrb_event_free(event);
return hash;
}
}
static VALUE method_close_handle(VALUE self) {
FETCH_DATA_PTR(self, zk);
if (ZKRBDebugging) {
/* fprintf(stderr, "CLOSING ZK INSTANCE: obj_id %lx", FIX2LONG(rb_obj_id(self)));*/
zkrb_debug_inst(self, "CLOSING_ZK_INSTANCE");
print_zkrb_instance_data(zk);
}
// this is a value on the ruby side we can check to see if destroy_zkrb_instance
// has been called
rb_iv_set(self, "@_closed", Qtrue);
zkrb_debug_inst(self, "calling destroy_zkrb_instance");
/* Note that after zookeeper_close() returns, ZK handle is invalid */
int rc = destroy_zkrb_instance(zk);
zkrb_debug("destroy_zkrb_instance returned: %d", rc);
return Qnil;
/* return INT2FIX(rc);*/
}
static VALUE method_get_next_event(VALUE self, VALUE blocking) {
// dbg.h
check_debug(!is_closed(self), "we are closed, not trying to get event");
char buf[64];
FETCH_DATA_PTR(self, zk);
for (;;) {
check_debug(!is_closed(self), "we're closed in the middle of method_get_next_event, bailing");
zkrb_event_t *event = zkrb_dequeue(zk->queue, 1);
/* Wait for an event using rb_thread_select() on the queue's pipe */
if (event == NULL) {
if (NIL_P(blocking) || (blocking == Qfalse)) {
goto error;
}
else {
// if we're shutting down, don't enter this section, we don't want to block
check_debug(!is_shutting_down(self), "method_get_next_event, we're shutting down, don't enter blocking section");
int fd = zk->queue->pipe_read;
ssize_t bytes_read = 0;
// wait for an fd to become readable, opposite of rb_thread_fd_writable
rb_thread_wait_fd(fd);
// clear all bytes here, we'll catch all the events on subsequent calls
// (until we run out of events)
bytes_read = read(fd, buf, sizeof(buf));
if (bytes_read == -1) {
rb_raise(rb_eRuntimeError, "read failed: %d", errno);
}
zkrb_debug_inst(self, "read %zd bytes from the queue (%p)'s pipe", bytes_read, zk->queue);
continue;
}
}
VALUE hash = zkrb_event_to_ruby(event);
zkrb_event_free(event);
return hash;
}
error:
return Qnil;
}
