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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 UnitedStack <haomai@unitedstack.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/errno.h"
#include "EventSelect.h"
#include <unistd.h>
#include <sys/select.h>
#define dout_subsys ceph_subsys_ms
#undef dout_prefix
#define dout_prefix *_dout << "SelectDriver."
int SelectDriver::init(EventCenter *c, int nevent)
{
ldout(cct, 0) << "Select isn't suitable for production env, just avoid "
<< "compiling error or special purpose" << dendl;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
max_fd = 0;
return 0;
}
int SelectDriver::add_event(int fd, int cur_mask, int add_mask)
{
ldout(cct, 10) << __func__ << " add event to fd=" << fd << " mask=" << add_mask
<< dendl;
int mask = cur_mask | add_mask;
if (mask & EVENT_READABLE)
FD_SET(fd, &rfds);
if (mask & EVENT_WRITABLE)
FD_SET(fd, &wfds);
if (fd > max_fd)
max_fd = fd;
return 0;
}
int SelectDriver::del_event(int fd, int cur_mask, int delmask)
{
ldout(cct, 10) << __func__ << " del event fd=" << fd << " cur mask=" << cur_mask
<< dendl;
if (delmask & EVENT_READABLE)
FD_CLR(fd, &rfds);
if (delmask & EVENT_WRITABLE)
FD_CLR(fd, &wfds);
return 0;
}
int SelectDriver::resize_events(int newsize)
{
return 0;
}
int SelectDriver::event_wait(vector<FiredFileEvent> &fired_events, struct timeval *tvp)
{
int retval, numevents = 0;
memcpy(&_rfds, &rfds, sizeof(fd_set));
memcpy(&_wfds, &wfds, sizeof(fd_set));
retval = select(max_fd+1, &_rfds, &_wfds, NULL, tvp);
if (retval > 0) {
for (int j = 0; j <= max_fd; j++) {
int mask = 0;
struct FiredFileEvent fe;
if (FD_ISSET(j, &_rfds))
mask |= EVENT_READABLE;
if (FD_ISSET(j, &_wfds))
mask |= EVENT_WRITABLE;
if (mask) {
fe.fd = j;
fe.mask = mask;
fired_events.push_back(fe);
numevents++;
}
}
}
return numevents;
}
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