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@ -1,14 +1,19 @@ |
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#include <set> |
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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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io_uring_params params = { 0 }; |
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params.flags = IORING_SETUP_SQPOLL; |
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params.sq_thread_idle = 10; |
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int ret = io_uring_queue_init_params(qd, &ring, ¶ms); |
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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*)malloc(sizeof(ring_data_t) * free_ring_data_ptr); |
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ring_data_total = free_ring_data_ptr = *ring.cq.kring_entries; |
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ring_datas = (ring_data_t*)malloc(sizeof(ring_data_t) * free_ring_data_ptr); |
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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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@ -16,6 +21,7 @@ ring_loop_t::ring_loop_t(int qd) |
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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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ring_datas[i] = { 0 }; |
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free_ring_data[i] = i; |
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} |
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} |
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@ -27,6 +33,105 @@ ring_loop_t::~ring_loop_t() |
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io_uring_queue_exit(&ring); |
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} |
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void ring_loop_t::drain_events(void *completions_ptr) |
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{ |
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std::set<ring_data_t*> & completions = *((std::set<ring_data_t*> *)completions_ptr); |
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if (free_ring_data_ptr < ring_data_total) |
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{ |
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// Try to cancel requests that are allowed to be canceled by the caller (epoll, timerfd and similar)
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for (int i = 0; i < ring_data_total; i++) |
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{ |
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if (ring_datas[i].allow_cancel) |
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{ |
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// allow_cancel may only be true while the operation is inflight
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io_uring_sqe *sqe = get_sqe(); |
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if (!sqe) |
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{ |
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throw std::runtime_error("can't get SQE to cancel operation"); |
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} |
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ring_data_t *data = (ring_data_t*)sqe->user_data; |
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data->callback = NULL; |
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ring_datas[i].res = -ECANCELED; |
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my_uring_prep_cancel(sqe, &ring_datas[i], 0); |
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// It seems (FIXME) cancel operations don't always get completions
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completions.insert(data); |
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} |
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} |
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if (completions.size() > 0) |
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{ |
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submit(); |
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} |
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} |
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int inflight = ring_data_total - free_ring_data_ptr; |
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while (completions.size() < inflight) |
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{ |
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io_uring_cqe *cqe; |
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while (!io_uring_peek_cqe(&ring, &cqe)) |
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{ |
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ring_data_t *d = (ring_data_t*)cqe->user_data; |
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d->res = cqe->res; |
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d->allow_cancel = false; |
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completions.insert(d); |
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io_uring_cqe_seen(&ring, cqe); |
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} |
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if (completions.size() < inflight) |
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{ |
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wait(); |
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} |
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} |
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} |
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void ring_loop_t::run_completions(void *completions_ptr) |
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{ |
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std::set<ring_data_t*> & completions = *((std::set<ring_data_t*> *)completions_ptr); |
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// Call event callbacks
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for (ring_data_t *d: completions) |
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{ |
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free_ring_data[free_ring_data_ptr++] = d - ring_datas; |
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if (d->callback) |
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d->callback(d); |
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} |
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} |
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int ring_loop_t::register_fd(int fd) |
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{ |
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std::set<ring_data_t*> completions; |
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drain_events((void*)&completions); |
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// Modify registered files
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int idx = reg_fds.size(); |
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reg_fds.push_back(fd); |
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if (registered) |
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{ |
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io_uring_unregister_files(&ring); |
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} |
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int ret = io_uring_register_files(&ring, reg_fds.data(), reg_fds.size()); |
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if (ret != 0) |
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{ |
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throw std::runtime_error(std::string("io_uring_register_files_update: ") + strerror(-ret)); |
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} |
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registered = 1; |
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run_completions((void*)&completions); |
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return idx; |
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} |
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void ring_loop_t::unregister_fd(int fd_index) |
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{ |
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std::set<ring_data_t*> completions; |
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drain_events((void*)&completions); |
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// Modify registered files
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reg_fds.erase(reg_fds.begin()+fd_index, reg_fds.begin()+fd_index+1); |
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if (registered) |
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{ |
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io_uring_unregister_files(&ring); |
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} |
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int ret = io_uring_register_files(&ring, reg_fds.data(), reg_fds.size()); |
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if (ret != 0) |
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{ |
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throw std::runtime_error(std::string("io_uring_register_files_update: ") + strerror(-ret)); |
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} |
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run_completions((void*)&completions); |
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} |
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int ring_loop_t::register_consumer(ring_consumer_t & consumer) |
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{ |
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consumer.number = consumers.size(); |
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@ -50,17 +155,16 @@ void ring_loop_t::unregister_consumer(ring_consumer_t & consumer) |
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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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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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ring_data_t *d = (ring_data_t*)cqe->user_data; |
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d->res = cqe->res; |
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d->allow_cancel = false; |
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io_uring_cqe_seen(&ring, cqe); |
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free_ring_data[free_ring_data_ptr++] = d - ring_datas; |
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if (d->callback) |
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{ |
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d->res = cqe->res; |
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d->callback(d); |
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} |
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free_ring_data[free_ring_data_ptr++] = d - ring_datas; |
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io_uring_cqe_seen(&ring, cqe); |
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} |
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do |
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{ |
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Vitaliy Filippov