mirror of
https://github.com/encounter/engine.git
synced 2026-03-30 11:09:55 -07:00
Chinmay Garde
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/fml/platform/linux/timerfd.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include "lib/ftl/files/eintr_wrapper.h"
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#if FML_TIMERFD_AVAILABLE == 0
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#include <asm/unistd.h>
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#include <sys/syscall.h>
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int timerfd_create(int clockid, int flags) {
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return syscall(__NR_timerfd_create, clockid, flags);
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}
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int timerfd_settime(int ufc,
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int flags,
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const struct itimerspec* utmr,
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struct itimerspec* otmr) {
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return syscall(__NR_timerfd_settime, ufc, flags, utmr, otmr);
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}
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#endif // FML_TIMERFD_AVAILABLE == 0
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namespace fml {
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#ifndef NSEC_PER_SEC
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#define NSEC_PER_SEC 1000000000
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#endif
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bool TimerRearm(int fd, ftl::TimePoint time_point) {
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const uint64_t nano_secs = time_point.ToEpochDelta().ToNanoseconds();
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struct itimerspec spec = {};
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spec.it_value.tv_sec = (time_t)(nano_secs / NSEC_PER_SEC);
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spec.it_value.tv_nsec = nano_secs % NSEC_PER_SEC;
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spec.it_interval = spec.it_value; // single expiry.
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int result = ::timerfd_settime(fd, TFD_TIMER_ABSTIME, &spec, nullptr);
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return result == 0;
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}
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bool TimerDrain(int fd) {
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// 8 bytes must be read from a signalled timer file descriptor when signalled.
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uint64_t fire_count = 0;
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ssize_t size = HANDLE_EINTR(::read(fd, &fire_count, sizeof(uint64_t)));
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if (size != sizeof(uint64_t)) {
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return false;
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}
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return fire_count > 0;
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}
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} // namespace fml
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