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#include <errno.h>
#include <stdio.h>
#include "sockets.hpp"
#define INVALID_FD -1
EventSelector::~EventSelector()
{
if(fd_array)
delete[] fd_array;
if(fds)
delete[] fds;
}
void EventSelector::Add(FdHandler *h)
{
int fd = h->GetFd();
if(!fd_array) {
fd_array_len = fd > 23 ? fd + 1 : 24;
fd_array = new FdHandler*[fd_array_len];
// maybe use memset too?
fds = new struct pollfd[fd_array_len];
for(int i = 0; i < fd_array_len; i++) {
fd_array[i] = 0;
fds[i] = { INVALID_FD, 0, 0 };
}
}
if(fd >= fd_array_len) {
FdHandler **tmp_arr = new FdHandler*[fd+1];
struct pollfd *tmp_fds = new struct pollfd[fd+1];
for(int i = 0; i <= fd; i++) {
if(i < fd_array_len) {
tmp_arr[i] = fd_array[i];
tmp_fds[i] = fds[i];
}
else {
fd_array[i] = 0;
fds[i] = { INVALID_FD, 0, 0 };
}
fd_array_len = fd + 1;
delete[] fd_array;
fd_array = tmp_arr;
delete[] fds;
fds = tmp_fds;
}
}
if(fd > max_fd)
max_fd = fd;
fd_array[fd] = h;
fds[fd].fd = fd;
if(fd_array[fd]->WantRead())
fds[fd].events |= POLLIN;
if(fd_array[fd]->WantWrite())
fds[fd].events |= POLLOUT;
}
bool EventSelector::Remove(FdHandler *h)
{
int fd = h->GetFd();
if(fd >= fd_array_len || fd_array[fd] != h)
return false;
fd_array[fd] = 0;
fds[fd] = { INVALID_FD, 0, 0 };
if(fd == max_fd) {
while(max_fd >= 0 && !fd_array[max_fd])
max_fd--;
}
return true;
}
void EventSelector::Run()
{
exit_flag = false;
do {
int res = poll(fds, max_fd+1, -1);
if(res < 0) {
if(errno == EINTR)
continue;
else
break;
}
if(res > 0) {
for(int i = 0; i <= max_fd; i++) {
if(!fd_array[i])
continue;
bool r = (fds[i].revents & POLLIN);
bool w = (fds[i].revents & POLLOUT);
if(r || w)
fd_array[i]->Handle(r, w);
}
}
} while(!exit_flag);
}
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