Vitaliy Filippov
4a2dcf7b6b
VNPL 1.1 is slightly reworded to make it clear that proprietary software interacting with Vitastor and providing some kind of service to end users isn't a "Proxy Program" if it's not specially designed to be used with Vitastor. For example, Windows OS running in a virtual machine stored in a Vitastor cluster clearly isn't.
115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
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#include <stdlib.h>
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#include <stdexcept>
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#include "ringloop.h"
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ring_loop_t::ring_loop_t(int qd)
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{
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int ret = io_uring_queue_init(qd, &ring, 0);
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if (ret < 0)
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{
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throw std::runtime_error(std::string("io_uring_queue_init: ") + strerror(-ret));
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}
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free_ring_data_ptr = *ring.cq.kring_entries;
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ring_datas = (struct ring_data_t*)calloc(free_ring_data_ptr, sizeof(ring_data_t));
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free_ring_data = (int*)malloc(sizeof(int) * free_ring_data_ptr);
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if (!ring_datas || !free_ring_data)
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{
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throw std::bad_alloc();
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}
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for (int i = 0; i < free_ring_data_ptr; i++)
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{
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free_ring_data[i] = i;
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}
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wait_sqe_id = 1;
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}
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ring_loop_t::~ring_loop_t()
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{
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free(free_ring_data);
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free(ring_datas);
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io_uring_queue_exit(&ring);
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}
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void ring_loop_t::register_consumer(ring_consumer_t *consumer)
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{
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unregister_consumer(consumer);
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consumers.push_back(consumer);
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}
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void ring_loop_t::wakeup()
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{
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loop_again = true;
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}
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void ring_loop_t::unregister_consumer(ring_consumer_t *consumer)
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{
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for (int i = 0; i < consumers.size(); i++)
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{
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if (consumers[i] == consumer)
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{
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consumers.erase(consumers.begin()+i, consumers.begin()+i+1);
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break;
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}
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}
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}
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void ring_loop_t::loop()
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{
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struct io_uring_cqe *cqe;
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while (!io_uring_peek_cqe(&ring, &cqe))
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{
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struct ring_data_t *d = (struct ring_data_t*)cqe->user_data;
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if (d->callback)
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{
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// First free ring_data item, then call the callback
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// so it has at least 1 free slot for the next event
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// which is required for EPOLLET to function properly
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struct ring_data_t dl;
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dl.iov = d->iov;
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dl.res = cqe->res;
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dl.callback.swap(d->callback);
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free_ring_data[free_ring_data_ptr++] = d - ring_datas;
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dl.callback(&dl);
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}
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else
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{
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printf("Warning: empty callback in SQE\n");
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free_ring_data[free_ring_data_ptr++] = d - ring_datas;
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}
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io_uring_cqe_seen(&ring, cqe);
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}
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while (get_sqe_queue.size() > 0)
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{
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(get_sqe_queue[0].second)();
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get_sqe_queue.erase(get_sqe_queue.begin());
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}
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do
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{
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loop_again = false;
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for (int i = 0; i < consumers.size(); i++)
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{
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consumers[i]->loop();
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}
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} while (loop_again);
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}
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unsigned ring_loop_t::save()
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{
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return ring.sq.sqe_tail;
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}
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void ring_loop_t::restore(unsigned sqe_tail)
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{
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assert(ring.sq.sqe_tail >= sqe_tail);
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for (unsigned i = sqe_tail; i < ring.sq.sqe_tail; i++)
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{
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free_ring_data[free_ring_data_ptr++] = ((ring_data_t*)ring.sq.sqes[i & *ring.sq.kring_mask].user_data) - ring_datas;
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}
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ring.sq.sqe_tail = sqe_tail;
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}
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