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Use level-triggered events for listening stream sockets.

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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.
This commit is contained in:
Sönke Ludwig 2017-09-02 00:11:34 +02:00
parent eb595ef858
commit fc5df2f949
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GPG key ID: D95E8DB493EE314C
5 changed files with 20 additions and 17 deletions
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6
source/eventcore/drivers/posix/driver.d
View file

@ -91,7 +91,7 @@ final class PosixEventDriver(Loop : PosixEventLoop) : EventDriver {
{
m_files.dispose();
m_dns.dispose();
m_loop.dispose();
m_loop.dispose();
}
}
@ -215,11 +215,11 @@ package class PosixEventLoop {
protected abstract bool doProcessEvents(Duration dur);
/// Registers the FD for general notification reception.
protected abstract void registerFD(FD fd, EventMask mask);
protected abstract void registerFD(FD fd, EventMask mask, bool edge_triggered = true);
/// Unregisters the FD for general notification reception.
protected abstract void unregisterFD(FD fd, EventMask mask);
/// Updates the event mask to use for listening for notifications.
protected abstract void updateFD(FD fd, EventMask old_mask, EventMask new_mask);
protected abstract void updateFD(FD fd, EventMask old_mask, EventMask new_mask, bool edge_triggered = true);
final protected void notify(EventType evt)(FD fd)
{

8
source/eventcore/drivers/posix/epoll.d
View file

@ -62,11 +62,11 @@ final class EpollEventLoop : PosixEventLoop {
close(m_epoll);
}
override void registerFD(FD fd, EventMask mask)
override void registerFD(FD fd, EventMask mask, bool edge_triggered = true)
{
debug (EventCoreEpollDebug) print("Epoll register FD %s: %s", fd, mask);
epoll_event ev;
ev.events |= EPOLLET;
if (edge_triggered) ev.events |= EPOLLET;
if (mask & EventMask.read) ev.events |= EPOLLIN;
if (mask & EventMask.write) ev.events |= EPOLLOUT;
if (mask & EventMask.status) ev.events |= EPOLLERR|EPOLLHUP|EPOLLRDHUP;
@ -80,11 +80,11 @@ final class EpollEventLoop : PosixEventLoop {
() @trusted { epoll_ctl(m_epoll, EPOLL_CTL_DEL, cast(int)fd, null); } ();
}
override void updateFD(FD fd, EventMask old_mask, EventMask mask)
override void updateFD(FD fd, EventMask old_mask, EventMask mask, bool edge_triggered = true)
{
debug (EventCoreEpollDebug) print("Epoll update FD %s: %s", fd, mask);
epoll_event ev;
ev.events |= EPOLLET;
if (edge_triggered) ev.events |= EPOLLET;
//ev.events = EPOLLONESHOT;
if (mask & EventMask.read) ev.events |= EPOLLIN;
if (mask & EventMask.write) ev.events |= EPOLLOUT;

17
source/eventcore/drivers/posix/kqueue.d
View file

@ -86,12 +86,13 @@ final class KqueueEventLoop : PosixEventLoop {
close(m_queue);
}
override void registerFD(FD fd, EventMask mask)
override void registerFD(FD fd, EventMask mask, bool edge_triggered = true)
{
//print("register %s %s", fd, mask);
kevent_t ev;
ev.ident = fd;
ev.flags = EV_ADD|EV_CLEAR|EV_ENABLE;
ev.flags = EV_ADD|EV_ENABLE;
if (edge_triggered) ev.flags |= EV_CLEAR;
if (mask & EventMask.read) {
ev.filter = EVFILT_READ;
m_changes ~= ev;
@ -111,21 +112,23 @@ final class KqueueEventLoop : PosixEventLoop {
m_changes ~= ev;
}
override void updateFD(FD fd, EventMask old_mask, EventMask new_mask)
override void updateFD(FD fd, EventMask old_mask, EventMask new_mask, bool edge_triggered = true)
{
//print("update %s %s", fd, mask);
kevent_t ev;
auto changes = old_mask ^ new_mask;
if (changes & EventMask.read) {
ev.filter = EVFILT_READ;
ev.flags = EV_CLEAR | (new_mask & EventMask.read ? EV_ADD : EV_DELETE);
ev.flags = new_mask & EventMask.read ? EV_ADD : EV_DELETE;
if (edge_triggered) ev.flags |= EV_CLEAR;
m_changes ~= ev;
}
if (changes & EventMask.write) {
ev.filter = EVFILT_WRITE;
ev.flags = EV_CLEAR | (new_mask & EventMask.write ? EV_ADD : EV_DELETE);
ev.flags = new_mask & EventMask.write ? EV_ADD : EV_DELETE;
if (edge_triggered) ev.flags |= EV_CLEAR;
m_changes ~= ev;
}

4
source/eventcore/drivers/posix/select.d
View file

@ -72,7 +72,7 @@ final class SelectEventLoop : PosixEventLoop {
{
}
override void registerFD(FD fd, EventMask mask)
override void registerFD(FD fd, EventMask mask, bool edge_triggered = true)
{
}
@ -80,7 +80,7 @@ final class SelectEventLoop : PosixEventLoop {
{
}
override void updateFD(FD fd, EventMask old_mask, EventMask mask)
override void updateFD(FD fd, EventMask old_mask, EventMask mask, bool edge_triggered = true)
{
}
}

2
source/eventcore/drivers/posix/sockets.d
View file

@ -172,7 +172,7 @@ final class PosixEventDriverSockets(Loop : PosixEventLoop) : EventDriverSockets
final override void waitForConnections(StreamListenSocketFD sock, AcceptCallback on_accept)
{
m_loop.registerFD(sock, EventMask.read);
m_loop.registerFD(sock, EventMask.read, false);
m_loop.m_fds[sock].streamListen.acceptCallback = on_accept;
m_loop.setNotifyCallback!(EventType.read)(sock, &onAccept);
onAccept(sock);