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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mplexer.hh"
#include "sstuff.hh"
#include <iostream>
#include <poll.h>
#include <unordered_map>
#include "misc.hh"
#include "namespaces.hh"
FDMultiplexer* FDMultiplexer::getMultiplexerSilent(unsigned int maxEventsHint)
{
FDMultiplexer* ret = nullptr;
for (const auto& i : FDMultiplexer::getMultiplexerMap()) {
try {
ret = i.second(std::min(maxEventsHint, FDMultiplexer::s_maxevents));
return ret;
}
catch (const FDMultiplexerException& fe) {
}
catch (...) {
}
}
return ret;
}
class PollFDMultiplexer : public FDMultiplexer
{
public:
PollFDMultiplexer(unsigned int /* maxEventsHint */)
{}
int run(struct timeval* tv, int timeout = 500) override;
void getAvailableFDs(std::vector<int>& fds, int timeout) override;
void addFD(int fd, FDMultiplexer::EventKind) override;
void removeFD(int fd, FDMultiplexer::EventKind) override;
string getName() const override
{
return "poll";
}
private:
std::unordered_map<int, struct pollfd> d_pollfds;
vector<struct pollfd> preparePollFD() const;
};
static FDMultiplexer* make(unsigned int maxEventsHint)
{
return new PollFDMultiplexer(maxEventsHint);
}
static struct RegisterOurselves
{
RegisterOurselves()
{
FDMultiplexer::getMultiplexerMap().emplace(2, &make);
}
} doIt;
static int convertEventKind(FDMultiplexer::EventKind kind)
{
switch (kind) {
case FDMultiplexer::EventKind::Read:
return POLLIN;
case FDMultiplexer::EventKind::Write:
return POLLOUT;
case FDMultiplexer::EventKind::Both:
return POLLIN | POLLOUT;
}
throw std::runtime_error("Unhandled event kind in the ports multiplexer");
}
void PollFDMultiplexer::addFD(int fd, FDMultiplexer::EventKind kind)
{
if (d_pollfds.count(fd) == 0) {
auto& pollfd = d_pollfds[fd];
pollfd.fd = fd;
pollfd.events = 0;
}
auto& pollfd = d_pollfds.at(fd);
pollfd.events |= convertEventKind(kind);
}
void PollFDMultiplexer::removeFD(int fd, FDMultiplexer::EventKind)
{
d_pollfds.erase(fd);
}
vector<struct pollfd> PollFDMultiplexer::preparePollFD() const
{
std::vector<struct pollfd> result;
result.reserve(d_pollfds.size());
for (const auto& entry : d_pollfds) {
result.push_back(entry.second);
}
return result;
}
void PollFDMultiplexer::getAvailableFDs(std::vector<int>& fds, int timeout)
{
auto pollfds = preparePollFD();
if (pollfds.empty()) {
return;
}
int ret = poll(&pollfds[0], pollfds.size(), timeout);
if (ret < 0 && errno != EINTR) {
throw FDMultiplexerException("poll returned error: " + stringerror());
}
for (const auto& pollfd : pollfds) {
if (pollfd.revents & POLLIN || pollfd.revents & POLLOUT || pollfd.revents & POLLERR || pollfd.revents & POLLHUP) {
fds.push_back(pollfd.fd);
}
}
}
int PollFDMultiplexer::run(struct timeval* now, int timeout)
{
if (d_inrun) {
throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
}
auto pollfds = preparePollFD();
if (pollfds.empty()) {
gettimeofday(now, nullptr); // MANDATORY!
return 0;
}
int ret = poll(&pollfds[0], pollfds.size(), timeout);
gettimeofday(now, nullptr); // MANDATORY!
if (ret < 0 && errno != EINTR) {
throw FDMultiplexerException("poll returned error: " + stringerror());
}
d_inrun = true;
int count = 0;
for (const auto& pollfd : pollfds) {
if (pollfd.revents & POLLIN || pollfd.revents & POLLERR || pollfd.revents & POLLHUP) {
const auto& iter = d_readCallbacks.find(pollfd.fd);
if (iter != d_readCallbacks.end()) {
iter->d_callback(iter->d_fd, iter->d_parameter);
count++;
}
}
if (pollfd.revents & POLLOUT || pollfd.revents & POLLERR) {
const auto& iter = d_writeCallbacks.find(pollfd.fd);
if (iter != d_writeCallbacks.end()) {
iter->d_callback(iter->d_fd, iter->d_parameter);
count++;
}
}
}
d_inrun = false;
return count;
}
#if 0
void acceptData(int fd, boost::any& parameter)
{
cout<<"Have data on fd "<<fd<<endl;
Socket* sock=boost::any_cast<Socket*>(parameter);
string packet;
IPEndpoint rem;
sock->recvFrom(packet, rem);
cout<<"Received "<<packet.size()<<" bytes!\n";
}
int main()
{
Socket s(AF_INET, SOCK_DGRAM);
IPEndpoint loc("0.0.0.0", 2000);
s.bind(loc);
PollFDMultiplexer sfm;
sfm.addReadFD(s.getHandle(), &acceptData, &s);
for(int n=0; n < 100 ; ++n) {
sfm.run();
}
sfm.removeReadFD(s.getHandle());
sfm.removeReadFD(s.getHandle());
}
#endif
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