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.
65 lines
1.6 KiB
C++
65 lines
1.6 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 <sys/timerfd.h>
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#include <sys/poll.h>
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#include <unistd.h>
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#include "timerfd_interval.h"
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timerfd_interval::timerfd_interval(ring_loop_t *ringloop, int seconds, std::function<void(void)> cb)
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{
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wait_state = 0;
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timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
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if (timerfd < 0)
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{
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throw std::runtime_error(std::string("timerfd_create: ") + strerror(errno));
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}
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struct itimerspec exp = {
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.it_interval = { seconds, 0 },
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.it_value = { seconds, 0 },
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};
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if (timerfd_settime(timerfd, 0, &exp, NULL))
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{
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throw std::runtime_error(std::string("timerfd_settime: ") + strerror(errno));
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}
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consumer.loop = [this]() { loop(); };
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ringloop->register_consumer(&consumer);
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this->ringloop = ringloop;
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this->callback = cb;
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}
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timerfd_interval::~timerfd_interval()
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{
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ringloop->unregister_consumer(&consumer);
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close(timerfd);
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}
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void timerfd_interval::loop()
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{
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if (wait_state == 1)
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{
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return;
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}
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struct io_uring_sqe *sqe = ringloop->get_sqe();
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if (!sqe)
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{
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wait_state = 0;
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return;
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}
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struct ring_data_t *data = ((ring_data_t*)sqe->user_data);
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my_uring_prep_poll_add(sqe, timerfd, POLLIN);
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data->callback = [&](ring_data_t *data)
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{
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if (data->res < 0)
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{
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throw std::runtime_error(std::string("waiting for timer failed: ") + strerror(-data->res));
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}
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uint64_t n;
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read(timerfd, &n, 8);
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wait_state = 0;
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callback();
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};
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wait_state = 1;
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ringloop->submit();
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}
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