blob: 2d6d98474c4813f076bb570bb10465b23395da88 [file] [log] [blame]
/*
* FD polling functions for generic poll()
*
* Copyright 2000-2007 Willy Tarreau <w@1wt.eu>
*
* This program 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 of the License, or (at your option) any later version.
*
*/
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/time.h>
#include <types/fd.h>
#include <types/global.h>
#include <proto/fd.h>
#include <proto/polling.h>
#include <proto/task.h>
static fd_set *StaticReadEvent, *StaticWriteEvent;
/* private data */
static struct pollfd *poll_events = NULL;
/*
* Benchmarks performed on a Pentium-M notebook show that using functions
* instead of the usual macros improve the FD_* performance by about 80%,
* and that marking them regparm(2) adds another 20%.
*/
REGPRM2 static int __fd_isset(const int fd, const int dir)
{
fd_set *ev;
if (dir == DIR_RD)
ev = StaticReadEvent;
else
ev = StaticWriteEvent;
return FD_ISSET(fd, ev);
}
REGPRM2 static void __fd_set(const int fd, const int dir)
{
fd_set *ev;
if (dir == DIR_RD)
ev = StaticReadEvent;
else
ev = StaticWriteEvent;
FD_SET(fd, ev);
}
REGPRM2 static void __fd_clr(const int fd, const int dir)
{
fd_set *ev;
if (dir == DIR_RD)
ev = StaticReadEvent;
else
ev = StaticWriteEvent;
FD_CLR(fd, ev);
}
REGPRM2 static int __fd_cond_s(const int fd, const int dir)
{
int ret;
fd_set *ev;
if (dir == DIR_RD)
ev = StaticReadEvent;
else
ev = StaticWriteEvent;
ret = !FD_ISSET(fd, ev);
if (ret)
FD_SET(fd, ev);
return ret;
}
REGPRM2 static int __fd_cond_c(const int fd, const int dir)
{
int ret;
fd_set *ev;
if (dir == DIR_RD)
ev = StaticReadEvent;
else
ev = StaticWriteEvent;
ret = FD_ISSET(fd, ev);
if (ret)
FD_CLR(fd, ev);
return ret;
}
REGPRM1 static void __fd_rem(const int fd)
{
FD_CLR(fd, StaticReadEvent);
FD_CLR(fd, StaticWriteEvent);
}
/*
* Initialization of the poll() poller.
* Returns 0 in case of failure, non-zero in case of success. If it fails, it
* disables the poller by setting its pref to 0.
*/
REGPRM1 static int poll_init(struct poller *p)
{
__label__ fail_swevt, fail_srevt, fail_pe;
int fd_set_bytes;
p->private = NULL;
fd_set_bytes = sizeof(fd_set) * (global.maxsock + FD_SETSIZE - 1) / FD_SETSIZE;
poll_events = (struct pollfd*)
calloc(1, sizeof(struct pollfd) * global.maxsock);
if (poll_events == NULL)
goto fail_pe;
if ((StaticReadEvent = (fd_set *)calloc(1, fd_set_bytes)) == NULL)
goto fail_srevt;
if ((StaticWriteEvent = (fd_set *)calloc(1, fd_set_bytes)) == NULL)
goto fail_swevt;
return 1;
fail_swevt:
free(StaticReadEvent);
fail_srevt:
free(poll_events);
fail_pe:
p->pref = 0;
return 0;
}
/*
* Termination of the poll() poller.
* Memory is released and the poller is marked as unselectable.
*/
REGPRM1 static void poll_term(struct poller *p)
{
if (StaticWriteEvent)
free(StaticWriteEvent);
if (StaticReadEvent)
free(StaticReadEvent);
if (poll_events)
free(poll_events);
p->private = NULL;
p->pref = 0;
}
/*
* Poll() poller
*/
REGPRM2 static void poll_poll(struct poller *p, int wait_time)
{
int status;
int fd, nbfd;
int fds, count;
int sr, sw;
unsigned rn, wn; /* read new, write new */
nbfd = 0;
for (fds = 0; (fds << INTBITS) < maxfd; fds++) {
rn = ((int*)StaticReadEvent)[fds];
wn = ((int*)StaticWriteEvent)[fds];
if ((rn|wn)) {
for (count = 0, fd = fds << INTBITS; count < (1<<INTBITS) && fd < maxfd; count++, fd++) {
#define FDSETS_ARE_INT_ALIGNED
#ifdef FDSETS_ARE_INT_ALIGNED
#define WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
#ifdef WE_REALLY_NOW_THAT_FDSETS_ARE_INTS
sr = (rn >> count) & 1;
sw = (wn >> count) & 1;
#else
sr = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&rn);
sw = FD_ISSET(fd&((1<<INTBITS)-1), (typeof(fd_set*))&wn);
#endif
#else
sr = FD_ISSET(fd, StaticReadEvent);
sw = FD_ISSET(fd, StaticWriteEvent);
#endif
if ((sr|sw)) {
poll_events[nbfd].fd = fd;
poll_events[nbfd].events = (sr ? POLLIN : 0) | (sw ? POLLOUT : 0);
nbfd++;
}
}
}
}
/* now let's wait for events */
status = poll(poll_events, nbfd, wait_time);
tv_now(&now);
for (count = 0; status > 0 && count < nbfd; count++) {
fd = poll_events[count].fd;
if (!(poll_events[count].revents & ( POLLOUT | POLLIN | POLLERR | POLLHUP )))
continue;
/* ok, we found one active fd */
status--;
if (FD_ISSET(fd, StaticReadEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLIN | POLLERR | POLLHUP ))
fdtab[fd].cb[DIR_RD].f(fd);
}
if (FD_ISSET(fd, StaticWriteEvent)) {
if (fdtab[fd].state == FD_STCLOSE)
continue;
if (poll_events[count].revents & ( POLLOUT | POLLERR | POLLHUP ))
fdtab[fd].cb[DIR_WR].f(fd);
}
}
}
/*
* The only exported function. Returns 1.
*/
int poll_register(struct poller *p)
{
p->name = "poll";
p->pref = 200;
p->private = NULL;
p->init = poll_init;
p->term = poll_term;
p->poll = poll_poll;
p->isset = __fd_isset;
p->set = __fd_set;
p->clr = __fd_clr;
p->clo = p->rem = __fd_rem;
p->cond_s = __fd_cond_s;
p->cond_c = __fd_cond_c;
return 1;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/