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Win wsa select event (#342)

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* Fix #323: Missing SelectInterrupt implementation for Windows

Using WSAEventSelect, WSAWaitForMultipleEvents and WSAEnumNetworkEvents to emulate poll() with an interrupt-event.

* Cleanup

* Fixed incomplete comment.

* Switched ifdefs to support other Unixes with pipe file descriptors

* Fixed: SelectInterrupt fallback code for getFd()==-1 && getEvent()==nullptr converted a PollResultType::Timeout into a ReadyForRead causing the HttpClient to fail because it uses a hard-coded "SelectInterrupt" instance that doesn't implement getFd() and getEvent().

* Fixed gcc compile errors

* - HttpClient now uses the SelectInterruptFactory
- Fixed wrong ix::poll result when using Windows WSA functions

* We must deselect the networkevents from the socket event. Otherwise the socket will report states that aren't there.
This commit is contained in:
Andreas Hausladen
2022-01-05 19:21:33 +01:00
committed by GitHub
parent 9f00428d57
commit 1f2895a469
12 changed files with 400 additions and 70 deletions
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63
ixwebsocket/IXSocket.cpp
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@@ -47,6 +47,8 @@ namespace ix
int sockfd,
const SelectInterruptPtr& selectInterrupt)
{
PollResultType pollResult = PollResultType::ReadyForRead;
//
// We used to use ::select to poll but on Android 9 we get large fds out of
// ::connect which crash in FD_SET as they are larger than FD_SETSIZE. Switching
@@ -68,9 +70,11 @@ namespace ix
// File descriptor used to interrupt select when needed
int interruptFd = -1;
void* interruptEvent = nullptr;
if (selectInterrupt)
{
interruptFd = selectInterrupt->getFd();
interruptEvent = selectInterrupt->getEvent();
if (interruptFd != -1)
{
@@ -78,11 +82,21 @@ namespace ix
fds[1].fd = interruptFd;
fds[1].events = POLLIN;
}
else if (interruptEvent == nullptr)
{
// Emulation mode: SelectInterrupt neither supports file descriptors nor events
// Check the selectInterrupt for requests before doing the poll().
if (readSelectInterruptRequest(selectInterrupt, &pollResult))
{
return pollResult;
}
}
}
int ret = ix::poll(fds, nfds, timeoutMs);
void* event = interruptEvent; // ix::poll will set event to nullptr if it wasn't signaled
int ret = ix::poll(fds, nfds, timeoutMs, &event);
PollResultType pollResult = PollResultType::ReadyForRead;
if (ret < 0)
{
pollResult = PollResultType::Error;
@@ -90,20 +104,19 @@ namespace ix
else if (ret == 0)
{
pollResult = PollResultType::Timeout;
}
else if (interruptFd != -1 && fds[1].revents & POLLIN)
{
uint64_t value = selectInterrupt->read();
if (selectInterrupt && interruptFd == -1 && interruptEvent == nullptr)
{
// Emulation mode: SelectInterrupt neither supports fd nor events
if (value == SelectInterrupt::kSendRequest)
{
pollResult = PollResultType::SendRequest;
}
else if (value == SelectInterrupt::kCloseRequest)
{
pollResult = PollResultType::CloseRequest;
// Check the selectInterrupt for requests
readSelectInterruptRequest(selectInterrupt, &pollResult);
}
}
else if ((interruptFd != -1 && fds[1].revents & POLLIN) || (interruptEvent != nullptr && event != nullptr))
{
// The InterruptEvent was signaled
readSelectInterruptRequest(selectInterrupt, &pollResult);
}
else if (sockfd != -1 && readyToRead && fds[0].revents & POLLIN)
{
pollResult = PollResultType::ReadyForRead;
@@ -143,6 +156,25 @@ namespace ix
return pollResult;
}
bool Socket::readSelectInterruptRequest(const SelectInterruptPtr& selectInterrupt,
PollResultType* pollResult)
{
uint64_t value = selectInterrupt->read();
if (value == SelectInterrupt::kSendRequest)
{
*pollResult = PollResultType::SendRequest;
return true;
}
else if (value == SelectInterrupt::kCloseRequest)
{
*pollResult = PollResultType::CloseRequest;
return true;
}
return false;
}
PollResultType Socket::isReadyToRead(int timeoutMs)
{
if (_sockfd == -1)
@@ -171,6 +203,11 @@ namespace ix
return _selectInterrupt->notify(wakeUpCode);
}
bool Socket::isWakeUpFromPollSupported()
{
return _selectInterrupt->getFd() != -1 || _selectInterrupt->getEvent() != nullptr;
}
bool Socket::accept(std::string& errMsg)
{
if (_sockfd == -1)