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/* -*- c++ -*- */
/*
* Copyright 2005 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gr_dispatcher.h>
#include <math.h>
#include <errno.h>
#ifdef HAVE_SELECT
# ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
# else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
# ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
# endif
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
# endif
#endif
static gr_dispatcher_sptr s_singleton;
gr_dispatcher_sptr
gr_make_dispatcher()
{
return gr_dispatcher_sptr(new gr_dispatcher());
}
gr_dispatcher_sptr
gr_dispatcher_singleton()
{
if (s_singleton)
return s_singleton;
s_singleton = gr_make_dispatcher();
return s_singleton;
}
#if !defined(HAVE_SELECT) // Stub it out
gr_dispatcher::gr_dispatcher()
{
}
gr_dispatcher::~gr_dispatcher()
{
}
bool
gr_dispatcher::add_handler(gr_select_handler_sptr handler)
{
return true;
}
bool
gr_dispatcher::del_handler(gr_select_handler_sptr handler)
{
return true;
}
bool
gr_dispatcher::del_handler(gr_select_handler *handler)
{
return true;
}
void
gr_dispatcher::loop(double timeout)
{
}
#else // defined(HAVE_SELECT)
gr_dispatcher::gr_dispatcher()
: d_handler(FD_SETSIZE), d_max_index(-1)
{
}
gr_dispatcher::~gr_dispatcher()
{
}
bool
gr_dispatcher::add_handler(gr_select_handler_sptr handler)
{
int fd = handler->fd();
if (fd < 0 || fd >= FD_SETSIZE)
return false;
d_max_index = std::max(d_max_index, fd);
d_handler[fd] = handler;
return true;
}
bool
gr_dispatcher::del_handler(gr_select_handler_sptr handler)
{
return del_handler(handler.get());
}
bool
gr_dispatcher::del_handler(gr_select_handler *handler)
{
int fd = handler->fd();
if (fd < 0 || fd >= FD_SETSIZE)
return false;
d_handler[fd].reset();
if (fd == d_max_index){
int i;
for (i = fd - 1; i >= 0 && !d_handler[i]; i--)
;
d_max_index = i;
}
return true;
}
void
gr_dispatcher::loop(double timeout)
{
struct timeval master;
struct timeval tmp;
fd_set rd_set;
fd_set wr_set;
double secs = floor (timeout);
master.tv_sec = (long) secs;
master.tv_usec = (long) ((timeout - secs) * 1e6);
while (d_max_index >= 0){
FD_ZERO(&rd_set);
FD_ZERO(&wr_set);
for (int i = 0; i <= d_max_index; i++){
if (d_handler[i] && d_handler[i]->readable())
FD_SET(i, &rd_set);
if (d_handler[i] && d_handler[i]->writable())
FD_SET(i, &wr_set);
}
tmp = master;
int retval = select(d_max_index+1, &rd_set, &wr_set, 0, &tmp);
if (retval == 0) // timed out with nothing ready
continue;
if (retval < 0){
if (errno == EINTR)
continue;
perror ("gr_dispatcher/select");
return;
}
for (int i = 0; i <= d_max_index; i++){
if (FD_ISSET(i, &rd_set))
if (d_handler[i])
d_handler[i]->handle_read();
if (FD_ISSET(i, &wr_set))
if (d_handler[i])
d_handler[i]->handle_write();
}
}
}
#endif
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