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xserver/os/WaitFor.c

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/* $XFree86: xc/programs/Xserver/os/WaitFor.c,v 3.42 2003/10/16 01:33:35 dawes Exp $ */
/***********************************************************
Copyright 1987, 1998 The Open Group
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/
/* $Xorg: WaitFor.c,v 1.4 2001/02/09 02:05:22 xorgcvs Exp $ */
/*****************************************************************
* OS Dependent input routines:
*
* WaitForSomething
* TimerForce, TimerSet, TimerCheck, TimerFree
*
*****************************************************************/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#ifdef WIN32
#include <X11/Xwinsock.h>
#endif
#include <X11/Xos.h> /* for strings, fcntl, time */
#include <errno.h>
#include <stdio.h>
#include <X11/X.h>
#include "misc.h"
#ifdef __UNIXOS2__
#define select(n,r,w,x,t) os2PseudoSelect(n,r,w,x,t)
#endif
#include "osdep.h"
#include <X11/Xpoll.h>
#include "dixstruct.h"
#include "opaque.h"
#ifdef DPMSExtension
#include "dpmsproc.h"
#endif
#ifdef WIN32
/* Error codes from windows sockets differ from fileio error codes */
#undef EINTR
#define EINTR WSAEINTR
#undef EINVAL
#define EINVAL WSAEINVAL
#undef EBADF
#define EBADF WSAENOTSOCK
/* Windows select does not set errno. Use GetErrno as wrapper for
WSAGetLastError */
#define GetErrno WSAGetLastError
#else
/* This is just a fallback to errno to hide the differences between unix and
Windows in the code */
#define GetErrno() errno
#endif
/* modifications by raphael */
int
mffs(fd_mask mask)
{
int i;
if (!mask) return 0;
i = 1;
while (!(mask & 1))
{
i++;
mask >>= 1;
}
return i;
}
#ifdef DPMSExtension
#define DPMS_SERVER
#include <X11/extensions/dpms.h>
#endif
#ifdef XTESTEXT1
/*
* defined in xtestext1dd.c
*/
extern int playback_on;
#endif /* XTESTEXT1 */
struct _OsTimerRec {
OsTimerPtr next;
CARD32 expires;
OsTimerCallback callback;
pointer arg;
};
static void DoTimer(OsTimerPtr timer, CARD32 now, OsTimerPtr *prev);
static OsTimerPtr timers = NULL;
/*****************
* WaitForSomething:
* Make the server suspend until there is
* 1. data from clients or
* 2. input events available or
* 3. ddx notices something of interest (graphics
* queue ready, etc.) or
* 4. clients that have buffered replies/events are ready
*
* If the time between INPUT events is
* greater than ScreenSaverTime, the display is turned off (or
* saved, depending on the hardware). So, WaitForSomething()
* has to handle this also (that's why the select() has a timeout.
* For more info on ClientsWithInput, see ReadRequestFromClient().
* pClientsReady is an array to store ready client->index values into.
*****************/
int
WaitForSomething(int *pClientsReady)
{
int i;
struct timeval waittime, *wt;
INT32 timeout = 0;
fd_set clientsReadable;
fd_set clientsWritable;
int curclient;
int selecterr;
int nready;
fd_set devicesReadable;
CARD32 now = 0;
#ifdef SMART_SCHEDULE
Bool someReady = FALSE;
#endif
FD_ZERO(&clientsReadable);
/* We need a while loop here to handle
crashed connections and the screen saver timeout */
while (1)
{
/* deal with any blocked jobs */
if (workQueue)
ProcessWorkQueue();
if (XFD_ANYSET (&ClientsWithInput))
{
#ifdef SMART_SCHEDULE
if (!SmartScheduleDisable)
{
someReady = TRUE;
waittime.tv_sec = 0;
waittime.tv_usec = 0;
wt = &waittime;
}
else
#endif
{
XFD_COPYSET (&ClientsWithInput, &clientsReadable);
break;
}
}
#ifdef SMART_SCHEDULE
if (someReady)
{
XFD_COPYSET(&AllSockets, &LastSelectMask);
XFD_UNSET(&LastSelectMask, &ClientsWithInput);
}
else
{
#endif
wt = NULL;
if (timers)
{
now = GetTimeInMillis();
timeout = timers->expires - now;
if (timeout < 0)
timeout = 0;
waittime.tv_sec = timeout / MILLI_PER_SECOND;
waittime.tv_usec = (timeout % MILLI_PER_SECOND) *
(1000000 / MILLI_PER_SECOND);
wt = &waittime;
}
XFD_COPYSET(&AllSockets, &LastSelectMask);
#ifdef SMART_SCHEDULE
}
SmartScheduleIdle = TRUE;
#endif
BlockHandler((pointer)&wt, (pointer)&LastSelectMask);
if (NewOutputPending)
FlushAllOutput();
#ifdef XTESTEXT1
/* XXX how does this interact with new write block handling? */
if (playback_on) {
wt = &waittime;
XTestComputeWaitTime (&waittime);
}
#endif /* XTESTEXT1 */
/* keep this check close to select() call to minimize race */
if (dispatchException)
i = -1;
else if (AnyClientsWriteBlocked)
{
XFD_COPYSET(&ClientsWriteBlocked, &clientsWritable);
i = Select (MaxClients, &LastSelectMask, &clientsWritable, NULL, wt);
}
else
{
i = Select (MaxClients, &LastSelectMask, NULL, NULL, wt);
}
selecterr = GetErrno();
WakeupHandler(i, (pointer)&LastSelectMask);
#ifdef XTESTEXT1
if (playback_on) {
i = XTestProcessInputAction (i, &waittime);
}
#endif /* XTESTEXT1 */
#ifdef SMART_SCHEDULE
if (i >= 0)
{
SmartScheduleIdle = FALSE;
SmartScheduleIdleCount = 0;
if (SmartScheduleTimerStopped)
(void) SmartScheduleStartTimer ();
}
#endif
if (i <= 0) /* An error or timeout occurred */
{
if (dispatchException)
return 0;
if (i < 0)
{
if (selecterr == EBADF) /* Some client disconnected */
{
CheckConnections ();
if (! XFD_ANYSET (&AllClients))
return 0;
}
else if (selecterr == EINVAL)
{
FatalError("WaitForSomething(): select: errno=%d\n",
selecterr);
}
else if (selecterr != EINTR)
{
ErrorF("WaitForSomething(): select: errno=%d\n",
selecterr);
}
}
#ifdef SMART_SCHEDULE
else if (someReady)
{
/*
* If no-one else is home, bail quickly
*/
XFD_COPYSET(&ClientsWithInput, &LastSelectMask);
XFD_COPYSET(&ClientsWithInput, &clientsReadable);
break;
}
#endif
if (*checkForInput[0] != *checkForInput[1])
return 0;
if (timers)
{
int expired = 0;
now = GetTimeInMillis();
if ((int) (timers->expires - now) <= 0)
expired = 1;
while (timers && (int) (timers->expires - now) <= 0)
DoTimer(timers, now, &timers);
if (expired)
return 0;
}
}
else
{
fd_set tmp_set;
if (*checkForInput[0] == *checkForInput[1]) {
if (timers)
{
int expired = 0;
now = GetTimeInMillis();
if ((int) (timers->expires - now) <= 0)
expired = 1;
while (timers && (int) (timers->expires - now) <= 0)
DoTimer(timers, now, &timers);
if (expired)
return 0;
}
}
#ifdef SMART_SCHEDULE
if (someReady)
XFD_ORSET(&LastSelectMask, &ClientsWithInput, &LastSelectMask);
#endif
if (AnyClientsWriteBlocked && XFD_ANYSET (&clientsWritable))
{
NewOutputPending = TRUE;
XFD_ORSET(&OutputPending, &clientsWritable, &OutputPending);
XFD_UNSET(&ClientsWriteBlocked, &clientsWritable);
if (! XFD_ANYSET(&ClientsWriteBlocked))
AnyClientsWriteBlocked = FALSE;
}
XFD_ANDSET(&devicesReadable, &LastSelectMask, &EnabledDevices);
XFD_ANDSET(&clientsReadable, &LastSelectMask, &AllClients);
XFD_ANDSET(&tmp_set, &LastSelectMask, &WellKnownConnections);
if (XFD_ANYSET(&tmp_set))
QueueWorkProc(EstablishNewConnections, NULL,
(pointer)&LastSelectMask);
#ifdef DPMSExtension
if (XFD_ANYSET (&devicesReadable) && (DPMSPowerLevel != DPMSModeOn))
DPMSSet(DPMSModeOn);
#endif
if (XFD_ANYSET (&devicesReadable) || XFD_ANYSET (&clientsReadable))
break;
#ifdef WIN32
/* Windows keyboard and mouse events are added to the input queue
in Block- and WakupHandlers. There is no device to check if
data is ready. So check here if new input is available */
if (*checkForInput[0] != *checkForInput[1])
return 0;
#endif
}
}
nready = 0;
if (XFD_ANYSET (&clientsReadable))
{
#ifndef WIN32
for (i=0; i<howmany(XFD_SETSIZE, NFDBITS); i++)
{
int highest_priority = 0;
while (clientsReadable.fds_bits[i])
{
int client_priority, client_index;
curclient = ffs (clientsReadable.fds_bits[i]) - 1;
client_index = /* raphael: modified */
ConnectionTranslation[curclient + (i * (sizeof(fd_mask) * 8))];
#else
int highest_priority = 0;
fd_set savedClientsReadable;
XFD_COPYSET(&clientsReadable, &savedClientsReadable);
for (i = 0; i < XFD_SETCOUNT(&savedClientsReadable); i++)
{
int client_priority, client_index;
curclient = XFD_FD(&savedClientsReadable, i);
client_index = GetConnectionTranslation(curclient);
#endif
#ifdef XSYNC
/* We implement "strict" priorities.
* Only the highest priority client is returned to
* dix. If multiple clients at the same priority are
* ready, they are all returned. This means that an
* aggressive client could take over the server.
* This was not considered a big problem because
* aggressive clients can hose the server in so many
* other ways :)
*/
client_priority = clients[client_index]->priority;
if (nready == 0 || client_priority > highest_priority)
{
/* Either we found the first client, or we found
* a client whose priority is greater than all others
* that have been found so far. Either way, we want
* to initialize the list of clients to contain just
* this client.
*/
pClientsReady[0] = client_index;
highest_priority = client_priority;
nready = 1;
}
/* the following if makes sure that multiple same-priority
* clients get batched together
*/
else if (client_priority == highest_priority)
#endif
{
pClientsReady[nready++] = client_index;
}
#ifndef WIN32
clientsReadable.fds_bits[i] &= ~(((fd_mask)1L) << curclient);
}
#else
FD_CLR(curclient, &clientsReadable);
#endif
}
}
return nready;
}
#if 0
/*
* This is not always a macro.
*/
ANYSET(FdMask *src)
{
int i;
for (i=0; i<mskcnt; i++)
if (src[ i ])
return (TRUE);
return (FALSE);
}
#endif
static void
DoTimer(OsTimerPtr timer, CARD32 now, OsTimerPtr *prev)
{
CARD32 newTime;
*prev = timer->next;
timer->next = NULL;
newTime = (*timer->callback)(timer, now, timer->arg);
if (newTime)
TimerSet(timer, 0, newTime, timer->callback, timer->arg);
}
_X_EXPORT OsTimerPtr
TimerSet(OsTimerPtr timer, int flags, CARD32 millis,
OsTimerCallback func, pointer arg)
{
register OsTimerPtr *prev;
CARD32 now = GetTimeInMillis();
if (!timer)
{
timer = (OsTimerPtr)xalloc(sizeof(struct _OsTimerRec));
if (!timer)
return NULL;
}
else
{
for (prev = &timers; *prev; prev = &(*prev)->next)
{
if (*prev == timer)
{
*prev = timer->next;
if (flags & TimerForceOld)
(void)(*timer->callback)(timer, now, timer->arg);
break;
}
}
}
if (!millis)
return timer;
if (!(flags & TimerAbsolute))
millis += now;
timer->expires = millis;
timer->callback = func;
timer->arg = arg;
if ((int) (millis - now) <= 0)
{
timer->next = NULL;
millis = (*timer->callback)(timer, now, timer->arg);
if (!millis)
return timer;
}
for (prev = &timers;
*prev && (int) ((*prev)->expires - millis) <= 0;
prev = &(*prev)->next)
;
timer->next = *prev;
*prev = timer;
return timer;
}
Bool
TimerForce(OsTimerPtr timer)
{
OsTimerPtr *prev;
for (prev = &timers; *prev; prev = &(*prev)->next)
{
if (*prev == timer)
{
DoTimer(timer, GetTimeInMillis(), prev);
return TRUE;
}
}
return FALSE;
}
_X_EXPORT void
TimerCancel(OsTimerPtr timer)
{
OsTimerPtr *prev;
if (!timer)
return;
for (prev = &timers; *prev; prev = &(*prev)->next)
{
if (*prev == timer)
{
*prev = timer->next;
break;
}
}
}
_X_EXPORT void
TimerFree(OsTimerPtr timer)
{
if (!timer)
return;
TimerCancel(timer);
xfree(timer);
}
void
TimerCheck(void)
{
CARD32 now = GetTimeInMillis();
while (timers && (int) (timers->expires - now) <= 0)
DoTimer(timers, now, &timers);
}
void
TimerInit(void)
{
OsTimerPtr timer;
while ((timer = timers))
{
timers = timer->next;
xfree(timer);
}
}
static CARD32
ScreenSaverTimeoutExpire(OsTimerPtr timer,CARD32 now,pointer arg)
{
INT32 timeout = now - lastDeviceEventTime.milliseconds;
if (timeout < ScreenSaverTime) {
return ScreenSaverTime - timeout;
}
ResetOsBuffers(); /* not ideal, but better than nothing */
SaveScreens(SCREEN_SAVER_ON, ScreenSaverActive);
#ifdef DPMSExtension
if (ScreenSaverInterval > 0 && DPMSPowerLevel == DPMSModeOn)
#else
if (ScreenSaverInterval > 0)
#endif /* DPMSExtension */
return ScreenSaverInterval;
return 0;
}
static OsTimerPtr ScreenSaverTimer = NULL;
void
FreeScreenSaverTimer(void)
{
if (ScreenSaverTimer) {
TimerFree(ScreenSaverTimer);
ScreenSaverTimer = NULL;
}
}
void
SetScreenSaverTimer(void)
{
if (ScreenSaverTime > 0) {
ScreenSaverTimer = TimerSet(ScreenSaverTimer, 0, ScreenSaverTime,
ScreenSaverTimeoutExpire, NULL);
} else if (ScreenSaverTimer) {
FreeScreenSaverTimer();
}
}
#ifdef DPMSExtension
static OsTimerPtr DPMSStandbyTimer = NULL;
static OsTimerPtr DPMSSuspendTimer = NULL;
static OsTimerPtr DPMSOffTimer = NULL;
static CARD32
DPMSStandbyTimerExpire(OsTimerPtr timer,CARD32 now,pointer arg)
{
INT32 timeout = now - lastDeviceEventTime.milliseconds;
if (timeout < DPMSStandbyTime) {
return DPMSStandbyTime - timeout;
}
if (DPMSPowerLevel < DPMSModeStandby) {
if (DPMSEnabled)
DPMSSet(DPMSModeStandby);
}
return DPMSStandbyTime;
}
static CARD32
DPMSSuspendTimerExpire(OsTimerPtr timer,CARD32 now,pointer arg)
{
INT32 timeout = now - lastDeviceEventTime.milliseconds;
if (timeout < DPMSSuspendTime) {
return DPMSSuspendTime - timeout;
}
if (DPMSPowerLevel < DPMSModeSuspend) {
if (DPMSEnabled)
DPMSSet(DPMSModeSuspend);
}
return DPMSSuspendTime;
}
static CARD32
DPMSOffTimerExpire(OsTimerPtr timer,CARD32 now,pointer arg)
{
INT32 timeout = now - lastDeviceEventTime.milliseconds;
if (timeout < DPMSOffTime) {
return DPMSOffTime - timeout;
}
if (DPMSPowerLevel < DPMSModeOff) {
if (DPMSEnabled)
DPMSSet(DPMSModeOff);
}
return DPMSOffTime;
}
void
FreeDPMSTimers(void)
{
if (DPMSStandbyTimer) {
TimerFree(DPMSStandbyTimer);
DPMSStandbyTimer = NULL;
}
if (DPMSSuspendTimer) {
TimerFree(DPMSSuspendTimer);
DPMSSuspendTimer = NULL;
}
if (DPMSOffTimer) {
TimerFree(DPMSOffTimer);
DPMSOffTimer = NULL;
}
}
_X_EXPORT void
SetDPMSTimers(void)
{
if (!DPMSEnabled)
return;
DPMSStandbyTimer = TimerSet(DPMSStandbyTimer, 0, DPMSStandbyTime,
DPMSStandbyTimerExpire, NULL);
DPMSSuspendTimer = TimerSet(DPMSSuspendTimer, 0, DPMSSuspendTime,
DPMSSuspendTimerExpire, NULL);
DPMSOffTimer = TimerSet(DPMSOffTimer, 0, DPMSOffTime,
DPMSOffTimerExpire, NULL);
}
#endif
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