190 lines
5.4 KiB
C
190 lines
5.4 KiB
C
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// 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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#pragma once
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#ifndef _LARGEFILE64_SOURCE
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#define _LARGEFILE64_SOURCE
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#endif
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#include <string.h>
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#include <assert.h>
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#include <liburing.h>
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#include <string>
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#include <functional>
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#include <vector>
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static inline void my_uring_prep_rw(int op, struct io_uring_sqe *sqe, int fd, const void *addr, unsigned len, off_t offset)
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{
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sqe->opcode = op;
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sqe->flags = 0;
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sqe->ioprio = 0;
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sqe->fd = fd;
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sqe->off = offset;
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sqe->addr = (unsigned long) addr;
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sqe->len = len;
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sqe->rw_flags = 0;
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sqe->__pad2[0] = sqe->__pad2[1] = sqe->__pad2[2] = 0;
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}
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static inline void my_uring_prep_readv(struct io_uring_sqe *sqe, int fd, const struct iovec *iovecs, unsigned nr_vecs, off_t offset)
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{
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my_uring_prep_rw(IORING_OP_READV, sqe, fd, iovecs, nr_vecs, offset);
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}
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static inline void my_uring_prep_read_fixed(struct io_uring_sqe *sqe, int fd, void *buf, unsigned nbytes, off_t offset, int buf_index)
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{
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my_uring_prep_rw(IORING_OP_READ_FIXED, sqe, fd, buf, nbytes, offset);
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sqe->buf_index = buf_index;
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}
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static inline void my_uring_prep_writev(struct io_uring_sqe *sqe, int fd, const struct iovec *iovecs, unsigned nr_vecs, off_t offset)
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{
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my_uring_prep_rw(IORING_OP_WRITEV, sqe, fd, iovecs, nr_vecs, offset);
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}
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static inline void my_uring_prep_write_fixed(struct io_uring_sqe *sqe, int fd, const void *buf, unsigned nbytes, off_t offset, int buf_index)
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{
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my_uring_prep_rw(IORING_OP_WRITE_FIXED, sqe, fd, buf, nbytes, offset);
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sqe->buf_index = buf_index;
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}
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static inline void my_uring_prep_recvmsg(struct io_uring_sqe *sqe, int fd, struct msghdr *msg, unsigned flags)
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{
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my_uring_prep_rw(IORING_OP_RECVMSG, sqe, fd, msg, 1, 0);
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sqe->msg_flags = flags;
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}
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static inline void my_uring_prep_sendmsg(struct io_uring_sqe *sqe, int fd, const struct msghdr *msg, unsigned flags)
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{
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my_uring_prep_rw(IORING_OP_SENDMSG, sqe, fd, msg, 1, 0);
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sqe->msg_flags = flags;
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}
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static inline void my_uring_prep_poll_add(struct io_uring_sqe *sqe, int fd, short poll_mask)
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{
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my_uring_prep_rw(IORING_OP_POLL_ADD, sqe, fd, NULL, 0, 0);
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sqe->poll_events = poll_mask;
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}
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static inline void my_uring_prep_poll_remove(struct io_uring_sqe *sqe, void *user_data)
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{
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my_uring_prep_rw(IORING_OP_POLL_REMOVE, sqe, 0, user_data, 0, 0);
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}
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static inline void my_uring_prep_fsync(struct io_uring_sqe *sqe, int fd, unsigned fsync_flags)
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{
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my_uring_prep_rw(IORING_OP_FSYNC, sqe, fd, NULL, 0, 0);
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sqe->fsync_flags = fsync_flags;
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}
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static inline void my_uring_prep_nop(struct io_uring_sqe *sqe)
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{
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my_uring_prep_rw(IORING_OP_NOP, sqe, 0, NULL, 0, 0);
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}
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static inline void my_uring_prep_timeout(struct io_uring_sqe *sqe, struct __kernel_timespec *ts, unsigned count, unsigned flags)
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{
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my_uring_prep_rw(IORING_OP_TIMEOUT, sqe, 0, ts, 1, count);
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sqe->timeout_flags = flags;
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}
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static inline void my_uring_prep_timeout_remove(struct io_uring_sqe *sqe, __u64 user_data, unsigned flags)
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{
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my_uring_prep_rw(IORING_OP_TIMEOUT_REMOVE, sqe, 0, (void *)user_data, 0, 0);
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sqe->timeout_flags = flags;
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}
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static inline void my_uring_prep_accept(struct io_uring_sqe *sqe, int fd, struct sockaddr *addr, socklen_t *addrlen, int flags)
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{
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my_uring_prep_rw(IORING_OP_ACCEPT, sqe, fd, addr, 0, (__u64) addrlen);
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sqe->accept_flags = flags;
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}
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static inline void my_uring_prep_cancel(struct io_uring_sqe *sqe, void *user_data, int flags)
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{
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my_uring_prep_rw(IORING_OP_ASYNC_CANCEL, sqe, 0, user_data, 0, 0);
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sqe->cancel_flags = flags;
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}
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struct ring_data_t
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{
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struct iovec iov; // for single-entry read/write operations
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int res;
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std::function<void(ring_data_t*)> callback;
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};
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struct ring_consumer_t
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{
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std::function<void(void)> loop;
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};
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class ring_loop_t
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{
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std::vector<std::pair<int,std::function<void()>>> get_sqe_queue;
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std::vector<ring_consumer_t*> consumers;
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struct ring_data_t *ring_datas;
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int *free_ring_data;
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int wait_sqe_id;
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unsigned free_ring_data_ptr;
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bool loop_again;
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struct io_uring ring;
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public:
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ring_loop_t(int qd);
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~ring_loop_t();
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void register_consumer(ring_consumer_t *consumer);
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void unregister_consumer(ring_consumer_t *consumer);
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inline struct io_uring_sqe* get_sqe()
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{
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if (free_ring_data_ptr == 0)
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return NULL;
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struct io_uring_sqe* sqe = io_uring_get_sqe(&ring);
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if (sqe)
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{
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*sqe = { 0 };
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io_uring_sqe_set_data(sqe, ring_datas + free_ring_data[--free_ring_data_ptr]);
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}
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return sqe;
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}
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inline int wait_sqe(std::function<void()> cb)
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{
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get_sqe_queue.push_back({ wait_sqe_id, cb });
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return wait_sqe_id++;
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}
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inline void cancel_wait_sqe(int wait_id)
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{
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for (int i = 0; i < get_sqe_queue.size(); i++)
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{
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if (get_sqe_queue[i].first == wait_id)
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{
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get_sqe_queue.erase(get_sqe_queue.begin()+i, get_sqe_queue.begin()+i+1);
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}
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}
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}
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inline int submit()
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{
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return io_uring_submit(&ring);
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}
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inline int wait()
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{
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struct io_uring_cqe *cqe;
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return io_uring_wait_cqe(&ring, &cqe);
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}
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inline unsigned space_left()
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{
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return free_ring_data_ptr;
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}
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inline bool has_work()
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{
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return loop_again;
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}
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void loop();
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void wakeup();
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unsigned save();
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void restore(unsigned sqe_tail);
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};
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