fc5df2f949
The limit of 20 accepted connections per event invocation can otherwise lead to no more connections being accepted when more that 20 connections are available at a time. This is an adaptation of @Boris-Barboris pull request #21 to restrict the level triggered behavior to listening sockets. See also #20.
137 lines
3.5 KiB
D
137 lines
3.5 KiB
D
/**
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BSD kqueue based event driver implementation.
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Kqueue is an efficient API for asynchronous I/O on BSD flavors, including
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OS X/macOS, suitable for large numbers of concurrently open sockets.
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*/
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module eventcore.drivers.posix.kqueue;
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@safe: /*@nogc:*/ nothrow:
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version (FreeBSD) enum have_kqueue = true;
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else version (OSX) enum have_kqueue = true;
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else enum have_kqueue = false;
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static if (have_kqueue):
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public import eventcore.drivers.posix.driver;
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import eventcore.internal.utils;
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import core.time : Duration;
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import core.sys.posix.sys.time : timespec, time_t;
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version (OSX) import core.sys.darwin.sys.event;
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else version (FreeBSD) import core.sys.freebsd.sys.event;
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else static assert(false, "Kqueue not supported on this OS.");
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import core.sys.linux.epoll;
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alias KqueueEventDriver = PosixEventDriver!KqueueEventLoop;
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final class KqueueEventLoop : PosixEventLoop {
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private {
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int m_queue;
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kevent_t[] m_changes;
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kevent_t[] m_events;
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}
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this()
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@safe nothrow {
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m_queue = () @trusted { return kqueue(); } ();
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m_events.length = 100;
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assert(m_queue >= 0, "Failed to create kqueue.");
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}
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override bool doProcessEvents(Duration timeout)
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@trusted {
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import std.algorithm : min;
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//assert(Fiber.getThis() is null, "processEvents may not be called from within a fiber!");
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//print("wait %s", m_events.length);
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timespec ts;
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long secs, hnsecs;
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timeout.split!("seconds", "hnsecs")(secs, hnsecs);
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ts.tv_sec = cast(time_t)secs;
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ts.tv_nsec = cast(uint)hnsecs * 100;
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auto ret = kevent(m_queue, m_changes.ptr, cast(int)m_changes.length, m_events.ptr, cast(int)m_events.length, timeout == Duration.max ? null : &ts);
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m_changes.length = 0;
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m_changes.assumeSafeAppend();
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//print("kevent returned %s", ret);
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if (ret > 0) {
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foreach (ref evt; m_events[0 .. ret]) {
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//print("event %s %s", evt.ident, evt.filter, evt.flags);
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assert(evt.ident <= uint.max);
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auto fd = cast(FD)cast(int)evt.ident;
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if (evt.flags & (EV_EOF|EV_ERROR))
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notify!(EventType.status)(fd);
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switch (evt.filter) {
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default: break;
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case EVFILT_READ: notify!(EventType.read)(fd); break;
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case EVFILT_WRITE: notify!(EventType.write)(fd); break;
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}
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// EV_SIGNAL, EV_TIMEOUT
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}
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return true;
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} else return false;
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}
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override void dispose()
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{
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import core.sys.posix.unistd : close;
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close(m_queue);
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}
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override void registerFD(FD fd, EventMask mask, bool edge_triggered = true)
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{
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//print("register %s %s", fd, mask);
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kevent_t ev;
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ev.ident = fd;
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ev.flags = EV_ADD|EV_ENABLE;
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if (edge_triggered) ev.flags |= EV_CLEAR;
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if (mask & EventMask.read) {
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ev.filter = EVFILT_READ;
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m_changes ~= ev;
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}
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if (mask & EventMask.write) {
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ev.filter = EVFILT_WRITE;
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m_changes ~= ev;
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}
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//if (mask & EventMask.status) ev.events |= EPOLLERR|EPOLLRDHUP;
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}
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override void unregisterFD(FD fd, EventMask mask)
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{
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kevent_t ev;
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ev.ident = fd;
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ev.flags = EV_DELETE;
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m_changes ~= ev;
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}
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override void updateFD(FD fd, EventMask old_mask, EventMask new_mask, bool edge_triggered = true)
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{
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//print("update %s %s", fd, mask);
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kevent_t ev;
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auto changes = old_mask ^ new_mask;
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if (changes & EventMask.read) {
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ev.filter = EVFILT_READ;
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ev.flags = new_mask & EventMask.read ? EV_ADD : EV_DELETE;
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if (edge_triggered) ev.flags |= EV_CLEAR;
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m_changes ~= ev;
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}
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if (changes & EventMask.write) {
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ev.filter = EVFILT_WRITE;
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ev.flags = new_mask & EventMask.write ? EV_ADD : EV_DELETE;
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if (edge_triggered) ev.flags |= EV_CLEAR;
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m_changes ~= ev;
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}
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//if (mask & EventMask.status) ev.events |= EPOLLERR|EPOLLRDHUP;
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}
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}
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