Class: Event::Backend::URing

Inherits:

Object

• Object
• Event::Backend::URing

Defined in:

ext/event/backend/uring.c

Instance Method Summary

• #close ⇒ Object
• #initialize(loop) ⇒ Object constructor
• #io_read(fiber, io, buffer, offset, length) ⇒ Object
• #io_wait(fiber, io, events) ⇒ Object
• #io_write(fiber, io, buffer, offset, length) ⇒ Object
• #select(duration) ⇒ Object

Constructor Details

#initialize(loop) ⇒ Object

# File 'ext/event/backend/uring.c', line 88

VALUE Event_Backend_URing_initialize(VALUE self, VALUE loop) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	data->loop = loop;
	
	int result = io_uring_queue_init(URING_ENTRIES, &data->ring, 0);
	
	if (result < 0) {
		rb_syserr_fail(-result, "io_uring_queue_init");
	}
	
	rb_update_max_fd(data->ring.ring_fd);
	
	return self;
}

Instance Method Details

#close ⇒ Object

# File 'ext/event/backend/uring.c', line 105

VALUE Event_Backend_URing_close(VALUE self) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	close_internal(data);
	
	return Qnil;
}

#io_read(fiber, io, buffer, offset, length) ⇒ Object

# File 'ext/event/backend/uring.c', line 233

VALUE Event_Backend_URing_io_read(VALUE self, VALUE fiber, VALUE io, VALUE buffer, VALUE offset, VALUE length) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	resize_to_capacity(buffer, NUM2SIZET(offset), NUM2SIZET(length));
	
	int descriptor = NUM2INT(rb_funcall(io, id_fileno, 0));
	struct io_uring_sqe *sqe = io_get_sqe(data);
	
	struct iovec iovecs[1];
	iovecs[0].iov_base = RSTRING_PTR(buffer) + NUM2SIZET(offset);
	iovecs[0].iov_len = NUM2SIZET(length);
	
	io_uring_prep_readv(sqe, descriptor, iovecs, 1, 0);
	io_uring_sqe_set_data(sqe, (void*)fiber);
	io_uring_submit(&data->ring);
	
	// fprintf(stderr, "prep_readv(%p, %d, %ld)\n", sqe, descriptor, iovecs[0].iov_len);
	
	int result = NUM2INT(rb_funcall(data->loop, id_transfer, 0));
	
	if (result < 0) {
		rb_syserr_fail(-result, strerror(-result));
	}
	
	resize_to_fit(buffer, NUM2SIZET(offset), (size_t)result);
	
	return INT2NUM(result);
}

#io_wait(fiber, io, events) ⇒ Object

# File 'ext/event/backend/uring.c', line 184

VALUE Event_Backend_URing_io_wait(VALUE self, VALUE fiber, VALUE io, VALUE events) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	int descriptor = NUM2INT(rb_funcall(io, id_fileno, 0));
	struct io_uring_sqe *sqe = io_get_sqe(data);
	
	if (!sqe) return INT2NUM(0);
	
	short flags = poll_flags_from_events(NUM2INT(events));
	
	// fprintf(stderr, "poll_add(%p, %d, %d, %p)\n", sqe, descriptor, flags, (void*)fiber);
	
	io_uring_prep_poll_add(sqe, descriptor, flags);
	io_uring_sqe_set_data(sqe, (void*)fiber);
	io_uring_submit(&data->ring);
	
	struct io_wait_arguments io_wait_arguments = {
		.data = data,
		.fiber = fiber,
		.flags = flags
	};
	
	return rb_rescue(io_wait_transfer, (VALUE)&io_wait_arguments, io_wait_rescue, (VALUE)&io_wait_arguments);
}

#io_write(fiber, io, buffer, offset, length) ⇒ Object

# File 'ext/event/backend/uring.c', line 263

VALUE Event_Backend_URing_io_write(VALUE self, VALUE fiber, VALUE io, VALUE buffer, VALUE offset, VALUE length) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	if ((size_t)RSTRING_LEN(buffer) < NUM2SIZET(offset) + NUM2SIZET(length)) {
		rb_raise(rb_eRuntimeError, "invalid offset/length exceeds bounds of buffer");
	}
	
	int descriptor = NUM2INT(rb_funcall(io, id_fileno, 0));
	struct io_uring_sqe *sqe = io_get_sqe(data);
	
	struct iovec iovecs[1];
	iovecs[0].iov_base = RSTRING_PTR(buffer) + NUM2SIZET(offset);
	iovecs[0].iov_len = NUM2SIZET(length);
	
	io_uring_prep_writev(sqe, descriptor, iovecs, 1, 0);
	io_uring_sqe_set_data(sqe, (void*)fiber);
	io_uring_submit(&data->ring);
	
	// fprintf(stderr, "prep_writev(%p, %d, %ld)\n", sqe, descriptor, iovecs[0].iov_len);
	
	int result = NUM2INT(rb_funcall(data->loop, id_transfer, 0));
	
	if (result < 0) {
		rb_syserr_fail(-result, strerror(-result));
	}
	
	return INT2NUM(result);
}

#select(duration) ⇒ Object

# File 'ext/event/backend/uring.c', line 359

VALUE Event_Backend_URing_select(VALUE self, VALUE duration) {
	struct Event_Backend_URing *data = NULL;
	TypedData_Get_Struct(self, struct Event_Backend_URing, &Event_Backend_URing_Type, data);
	
	struct io_uring_cqe *cqes[URING_MAX_EVENTS];
	
	// This is a non-blocking operation:
	int result = io_uring_peek_batch_cqe(&data->ring, cqes, URING_MAX_EVENTS);
	
	if (result < 0) {
		rb_syserr_fail(-result, strerror(-result));
	} else if (result == 0) {
		// We might need to wait for events:
		struct select_arguments arguments = {
			.data = data,
			.cqes = cqes,
			.timeout = NULL,
		};
		
		arguments.timeout = make_timeout(duration, &arguments.storage);
		
		if (!timeout_nonblocking(arguments.timeout)) {
			result = select_internal_without_gvl(&arguments);
		}
	}
	
	// fprintf(stderr, "cqes count=%d\n", result);
	
	for (int i = 0; i < result; i += 1) {
		// If the operation was cancelled, or the operation has no user data (fiber):
		if (cqes[i]->res == -ECANCELED || cqes[i]->user_data == 0) {
			continue;
		}
		
		VALUE fiber = (VALUE)io_uring_cqe_get_data(cqes[i]);
		VALUE result = INT2NUM(cqes[i]->res);
		
		// fprintf(stderr, "cqes[i] res=%d user_data=%p\n", cqes[i]->res, (void*)cqes[i]->user_data);
		
		io_uring_cqe_seen(&data->ring, cqes[i]);
		
		rb_funcall(fiber, id_transfer, 1, result);
	}
	
	return INT2NUM(result);
}