Class: Event::Backend::URing

Inherits:

Object

• Object
• Event::Backend::URing

Defined in:

ext/event/backend/uring.c

Instance Method Summary

• #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 83

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

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

# File 'ext/event/backend/uring.c', line 172

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_uring_get_sqe(&data->ring);
	
	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 125

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_uring_get_sqe(&data->ring);
	
	short flags = poll_flags_from_events(NUM2INT(events));
	
	// fprintf(stderr, "poll_add(%p, %d, %d)\n", sqe, descriptor, flags);
	
	io_uring_prep_poll_add(sqe, descriptor, flags);
	io_uring_sqe_set_data(sqe, (void*)fiber);
	io_uring_submit(&data->ring);
	
	VALUE result = rb_funcall(data->loop, id_transfer, 0);
	
	// We explicitly filter the resulting events based on the requested events.
	// In some cases, poll will report events we didn't ask for.
	flags &= NUM2INT(result);
	
	return INT2NUM(events_from_poll_flags(flags));
}

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

# File 'ext/event/backend/uring.c', line 202

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_uring_get_sqe(&data->ring);
	
	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 258

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];
	struct __kernel_timespec storage;
	
	int result = io_uring_peek_batch_cqe(&data->ring, cqes, URING_MAX_EVENTS);
	
	// fprintf(stderr, "result = %d\n", result);
	
	if (result < 0) {
		rb_syserr_fail(-result, strerror(-result));
	} else if (result == 0 && duration != Qnil) {
		result = io_uring_wait_cqes(&data->ring, cqes, 1, make_timeout(duration, &storage), NULL);
		
		// fprintf(stderr, "result (timeout) = %d\n", result);
		
		if (result == -ETIME) {
			result = 0;
		} else if (result < 0) {
			rb_syserr_fail(-result, strerror(-result));
		}
	}
	
	for (int i = 0; i < result; i += 1) {
		VALUE fiber = (VALUE)io_uring_cqe_get_data(cqes[i]);
		VALUE result = INT2NUM(cqes[i]->res);
		
		// fprintf(stderr, "cqes[i]->res = %d\n", cqes[i]->res);
		
		io_uring_cqe_seen(&data->ring, cqes[i]);
		
		rb_funcall(fiber, id_transfer, 1, result);
	}
	
	return INT2NUM(result);
}