bbbbf5f4bd
Fixes a regression by commit 3558317dc9 which caused the ALSA null
plugin to cease to work because the workaround timer was never rescheduled.
135 lines
2.5 KiB
C++
135 lines
2.5 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "MultiSocketMonitor.hxx"
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#include "Loop.hxx"
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#include <algorithm>
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#ifdef USE_EPOLL
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#include <cerrno>
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#endif
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#ifndef _WIN32
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#include <poll.h>
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#endif
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MultiSocketMonitor::MultiSocketMonitor(EventLoop &_loop) noexcept
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:idle_event(_loop, BIND_THIS_METHOD(OnIdle)),
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timeout_event(_loop, BIND_THIS_METHOD(OnTimeout)) {
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}
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void
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MultiSocketMonitor::Reset() noexcept
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{
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assert(GetEventLoop().IsInside());
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fds.clear();
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#ifdef USE_EPOLL
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always_ready_fds.clear();
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#endif
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idle_event.Cancel();
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timeout_event.Cancel();
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ready = refresh = false;
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}
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bool
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MultiSocketMonitor::AddSocket(SocketDescriptor fd, unsigned events) noexcept
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{
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fds.emplace_front(*this, fd);
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bool success = fds.front().Schedule(events);
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if (!success) {
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fds.pop_front();
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#ifdef USE_EPOLL
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if (errno == EPERM)
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/* not supported by epoll (e.g. "/dev/null"):
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add it to the "always ready" list */
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always_ready_fds.push_front({fd, events});
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#endif
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}
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return success;
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}
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void
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MultiSocketMonitor::ClearSocketList() noexcept
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{
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assert(GetEventLoop().IsInside());
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fds.clear();
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#ifdef USE_EPOLL
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always_ready_fds.clear();
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#endif
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}
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#ifndef _WIN32
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void
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MultiSocketMonitor::ReplaceSocketList(std::span<pollfd> pfds) noexcept
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{
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#ifdef USE_EPOLL
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always_ready_fds.clear();
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#endif
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UpdateSocketList([pfds](SocketDescriptor fd) -> unsigned {
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auto i = std::find_if(pfds.begin(), pfds.end(), [fd](const struct pollfd &pfd){
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return pfd.fd == fd.Get();
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});
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if (i == pfds.end())
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return 0;
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return std::exchange(i->events, 0);
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});
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for (const auto &i : pfds)
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if (i.events != 0)
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AddSocket(SocketDescriptor(i.fd), i.events);
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}
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#endif
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void
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MultiSocketMonitor::Prepare() noexcept
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{
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auto timeout = PrepareSockets();
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#ifdef USE_EPOLL
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if (!always_ready_fds.empty()) {
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/* if there was at least one file descriptor not
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supported by epoll, install a very short timeout
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because we assume it's always ready */
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constexpr Event::Duration ready_timeout =
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std::chrono::milliseconds(1);
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if (timeout < timeout.zero() || timeout > ready_timeout)
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timeout = always_ready_timeout = ready_timeout;
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}
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#endif
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if (timeout >= timeout.zero())
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timeout_event.Schedule(timeout);
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else
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timeout_event.Cancel();
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}
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void
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MultiSocketMonitor::OnIdle() noexcept
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{
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if (ready) {
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ready = false;
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DispatchSockets();
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#ifdef USE_EPOLL
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if (!refresh && !always_ready_fds.empty())
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timeout_event.Schedule(always_ready_timeout);
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#endif
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}
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if (refresh) {
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refresh = false;
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Prepare();
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}
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}
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