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sync.c
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/*
Copyright 1991, 1993, 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 1991, 1993 by Digital Equipment Corporation, Maynard, Massachusetts,
and Olivetti Research Limited, Cambridge, England.
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 names of Digital or Olivetti
not be used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission. Digital and Olivetti
make no representations about the suitability of this software
for any purpose. It is provided "as is" without express or implied warranty.
DIGITAL AND OLIVETTI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL THEY 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.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include <string.h>
#include <X11/X.h>
#include <X11/Xproto.h>
#include <X11/Xmd.h>
#include "misc.h"
#include "os.h"
#include "extnsionst.h"
#include "dixstruct.h"
#include "resource.h"
#include "opaque.h"
#define _SYNC_SERVER
#include <X11/extensions/sync.h>
#include <X11/extensions/syncstr.h>
#include <stdio.h>
#include <sys/time.h>
#include "extinit.h"
/*
* Local Global Variables
*/
static int SyncEventBase;
static int SyncErrorBase;
static RESTYPE RTCounter = 0;
static RESTYPE RTAwait;
static RESTYPE RTAlarm;
static RESTYPE RTAlarmClient;
static int SyncNumSystemCounters = 0;
static SyncCounter **SysCounterList = NULL;
#define IsSystemCounter(pCounter) \
(pCounter && (pCounter->client == NULL))
/* these are all the alarm attributes that pertain to the alarm's trigger */
#define XSyncCAAllTrigger \
(XSyncCACounter | XSyncCAValueType | XSyncCAValue | XSyncCATestType)
static int
FreeAlarm(pointer /* addr */ ,
XID /* id */
);
static int
FreeAlarmClient(pointer /* value */ ,
XID /* id */
);
static int
FreeAwait(pointer /* addr */ ,
XID /* id */
);
static void
ServertimeBracketValues(pointer /* pCounter */ ,
CARD64 * /* pbracket_less */ ,
CARD64 * /* pbracket_greater */
);
static void
ServertimeQueryValue(pointer /* pCounter */ ,
CARD64 * /* pValue_return */
);
static void
ServertimeWakeupHandler(pointer /* env */ ,
int /* rc */ ,
pointer /* LastSelectMask */
);
static int
SyncInitTrigger(ClientPtr /* client */ ,
SyncTrigger * /* pTrigger */ ,
XSyncCounter /* counter */ ,
Mask /* changes */
);
static void
SAlarmNotifyEvent(xSyncAlarmNotifyEvent * /* from */ ,
xSyncAlarmNotifyEvent * /* to */
);
static void
SCounterNotifyEvent(xSyncCounterNotifyEvent * /* from */ ,
xSyncCounterNotifyEvent * /* to */
);
static void
ServertimeBlockHandler(pointer /* env */ ,
struct timeval ** /* wt */ ,
pointer /* LastSelectMask */
);
static int
SyncAddTriggerToCounter(SyncTrigger * /* pTrigger */
);
extern void
SyncAlarmCounterDestroyed(SyncTrigger * /* pTrigger */
);
static void
SyncAlarmTriggerFired(SyncTrigger * /* pTrigger */
);
static void
SyncAwaitTriggerFired(SyncTrigger * /* pTrigger */
);
static int
SyncChangeAlarmAttributes(ClientPtr /* client */ ,
SyncAlarm * /* pAlarm */ ,
Mask /* mask */ ,
CARD32 * /* values */
);
static Bool
SyncCheckTriggerNegativeComparison(SyncTrigger * /* pTrigger */ ,
CARD64 /* oldval */
);
static Bool
SyncCheckTriggerNegativeTransition(SyncTrigger * /* pTrigger */ ,
CARD64 /* oldval */
);
static Bool
SyncCheckTriggerPositiveComparison(SyncTrigger * /* pTrigger */ ,
CARD64 /* oldval */
);
static Bool
SyncCheckTriggerPositiveTransition(SyncTrigger * /* pTrigger */ ,
CARD64 /* oldval */
);
static SyncCounter *SyncCreateCounter(ClientPtr /* client */ ,
XSyncCounter /* id */ ,
CARD64 /* initialvalue */
);
static void SyncComputeBracketValues(SyncCounter * /* pCounter */ ,
Bool /* startOver */
);
static void
SyncDeleteTriggerFromCounter(SyncTrigger * /* pTrigger */
);
static Bool
SyncEventSelectForAlarm(SyncAlarm * /* pAlarm */ ,
ClientPtr /* client */ ,
Bool /* wantevents */
);
static void
SyncInitServerTime(void
);
static void
SyncResetProc(ExtensionEntry * /* extEntry */
);
static void
SyncSendAlarmNotifyEvents(SyncAlarm * /* pAlarm */
);
static void
SyncSendCounterNotifyEvents(ClientPtr /* client */ ,
SyncAwait ** /* ppAwait */ ,
int /* num_events */
);
static DISPATCH_PROC(ProcSyncAwait);
static DISPATCH_PROC(ProcSyncChangeAlarm);
static DISPATCH_PROC(ProcSyncChangeCounter);
static DISPATCH_PROC(ProcSyncCreateAlarm);
static DISPATCH_PROC(ProcSyncCreateCounter);
static DISPATCH_PROC(ProcSyncDestroyAlarm);
static DISPATCH_PROC(ProcSyncDestroyCounter);
static DISPATCH_PROC(ProcSyncDispatch);
static DISPATCH_PROC(ProcSyncGetPriority);
static DISPATCH_PROC(ProcSyncInitialize);
static DISPATCH_PROC(ProcSyncListSystemCounters);
static DISPATCH_PROC(ProcSyncQueryAlarm);
static DISPATCH_PROC(ProcSyncQueryCounter);
static DISPATCH_PROC(ProcSyncSetCounter);
static DISPATCH_PROC(ProcSyncSetPriority);
static DISPATCH_PROC(SProcSyncAwait);
static DISPATCH_PROC(SProcSyncChangeAlarm);
static DISPATCH_PROC(SProcSyncChangeCounter);
static DISPATCH_PROC(SProcSyncCreateAlarm);
static DISPATCH_PROC(SProcSyncCreateCounter);
static DISPATCH_PROC(SProcSyncDestroyAlarm);
static DISPATCH_PROC(SProcSyncDestroyCounter);
static DISPATCH_PROC(SProcSyncDispatch);
static DISPATCH_PROC(SProcSyncGetPriority);
static DISPATCH_PROC(SProcSyncInitialize);
static DISPATCH_PROC(SProcSyncListSystemCounters);
static DISPATCH_PROC(SProcSyncQueryAlarm);
static DISPATCH_PROC(SProcSyncQueryCounter);
static DISPATCH_PROC(SProcSyncSetCounter);
static DISPATCH_PROC(SProcSyncSetPriority);
/* Each counter maintains a simple linked list of triggers that are
* interested in the counter. The two functions below are used to
* delete and add triggers on this list.
*/
static void
SyncDeleteTriggerFromCounter(pTrigger)
SyncTrigger *pTrigger;
{
SyncTriggerList *pCur;
SyncTriggerList *pPrev;
/* pCounter needs to be stored in pTrigger before calling here. */
if (!pTrigger->pCounter)
return;
pPrev = NULL;
pCur = pTrigger->pCounter->pTriglist;
while (pCur) {
if (pCur->pTrigger == pTrigger) {
if (pPrev)
pPrev->next = pCur->next;
else
pTrigger->pCounter->pTriglist = pCur->next;
free(pCur);
break;
}
pPrev = pCur;
pCur = pCur->next;
}
if (IsSystemCounter(pTrigger->pCounter))
SyncComputeBracketValues(pTrigger->pCounter, /*startOver */ TRUE);
}
static int
SyncAddTriggerToCounter(pTrigger)
SyncTrigger *pTrigger;
{
SyncTriggerList *pCur;
if (!pTrigger->pCounter)
return Success;
/* don't do anything if it's already there */
for (pCur = pTrigger->pCounter->pTriglist; pCur; pCur = pCur->next) {
if (pCur->pTrigger == pTrigger)
return Success;
}
if (!(pCur = malloc(sizeof(SyncTriggerList))))
return BadAlloc;
pCur->pTrigger = pTrigger;
pCur->next = pTrigger->pCounter->pTriglist;
pTrigger->pCounter->pTriglist = pCur;
if (IsSystemCounter(pTrigger->pCounter))
SyncComputeBracketValues(pTrigger->pCounter, /*startOver */ TRUE);
return Success;
}
/* Below are four possible functions that can be plugged into
* pTrigger->CheckTrigger, corresponding to the four possible
* test-types. These functions are called after the counter's
* value changes but are also passed the old counter value
* so they can inspect both the old and new values.
* (PositiveTransition and NegativeTransition need to see both
* pieces of information.) These functions return the truth value
* of the trigger.
*
* All of them include the condition pTrigger->pCounter == NULL.
* This is because the spec says that a trigger with a counter value
* of None is always TRUE.
*/
static Bool
SyncCheckTriggerPositiveComparison(pTrigger, oldval)
SyncTrigger *pTrigger;
CARD64 oldval;
{
return (pTrigger->pCounter == NULL ||
XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
pTrigger->test_value));
}
static Bool
SyncCheckTriggerNegativeComparison(pTrigger, oldval)
SyncTrigger *pTrigger;
CARD64 oldval;
{
return (pTrigger->pCounter == NULL ||
XSyncValueLessOrEqual(pTrigger->pCounter->value,
pTrigger->test_value));
}
static Bool
SyncCheckTriggerPositiveTransition(pTrigger, oldval)
SyncTrigger *pTrigger;
CARD64 oldval;
{
return (pTrigger->pCounter == NULL ||
(XSyncValueLessThan(oldval, pTrigger->test_value) &&
XSyncValueGreaterOrEqual(pTrigger->pCounter->value,
pTrigger->test_value)));
}
static Bool
SyncCheckTriggerNegativeTransition(pTrigger, oldval)
SyncTrigger *pTrigger;
CARD64 oldval;
{
return (pTrigger->pCounter == NULL ||
(XSyncValueGreaterThan(oldval, pTrigger->test_value) &&
XSyncValueLessOrEqual(pTrigger->pCounter->value,
pTrigger->test_value)));
}
static int
SyncInitTrigger(client, pTrigger, counter, changes)
ClientPtr client; /* so we can set errorValue */
SyncTrigger *pTrigger;
XSyncCounter counter;
Mask changes;
{
SyncCounter *pCounter = pTrigger->pCounter;
int status;
Bool newcounter = FALSE;
if (changes & XSyncCACounter) {
if (counter == None)
pCounter = NULL;
else if (!
(pCounter =
(SyncCounter *) SecurityLookupIDByType(client, counter,
RTCounter,
SecurityReadAccess))) {
client->errorValue = counter;
return SyncErrorBase + XSyncBadCounter;
}
if (pCounter != pTrigger->pCounter) { /* new counter for trigger */
SyncDeleteTriggerFromCounter(pTrigger);
pTrigger->pCounter = pCounter;
newcounter = TRUE;
}
}
/* if system counter, ask it what the current value is */
if (IsSystemCounter(pCounter)) {
(*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter,
&pCounter->value);
}
if (changes & XSyncCAValueType) {
if (pTrigger->value_type != XSyncRelative &&
pTrigger->value_type != XSyncAbsolute) {
client->errorValue = pTrigger->value_type;
return BadValue;
}
}
if (changes & XSyncCATestType) {
if (pTrigger->test_type != XSyncPositiveTransition &&
pTrigger->test_type != XSyncNegativeTransition &&
pTrigger->test_type != XSyncPositiveComparison &&
pTrigger->test_type != XSyncNegativeComparison) {
client->errorValue = pTrigger->test_type;
return BadValue;
}
/* select appropriate CheckTrigger function */
switch (pTrigger->test_type) {
case XSyncPositiveTransition:
pTrigger->CheckTrigger = SyncCheckTriggerPositiveTransition;
break;
case XSyncNegativeTransition:
pTrigger->CheckTrigger = SyncCheckTriggerNegativeTransition;
break;
case XSyncPositiveComparison:
pTrigger->CheckTrigger = SyncCheckTriggerPositiveComparison;
break;
case XSyncNegativeComparison:
pTrigger->CheckTrigger = SyncCheckTriggerNegativeComparison;
break;
}
}
if (changes & (XSyncCAValueType | XSyncCAValue)) {
if (pTrigger->value_type == XSyncAbsolute)
pTrigger->test_value = pTrigger->wait_value;
else { /* relative */
Bool overflow;
if (pCounter == NULL)
return BadMatch;
XSyncValueAdd(&pTrigger->test_value, pCounter->value,
pTrigger->wait_value, &overflow);
if (overflow) {
client->errorValue = XSyncValueHigh32(pTrigger->wait_value);
return BadValue;
}
}
}
/* we wait until we're sure there are no errors before registering
* a new counter on a trigger
*/
if (newcounter) {
if ((status = SyncAddTriggerToCounter(pTrigger)) != Success)
return status;
}
else if (IsSystemCounter(pCounter)) {
SyncComputeBracketValues(pCounter, /*startOver */ TRUE);
}
return Success;
}
/* AlarmNotify events happen in response to actions taken on an Alarm or
* the counter used by the alarm. AlarmNotify may be sent to multiple
* clients. The alarm maintains a list of clients interested in events.
*/
static void
SyncSendAlarmNotifyEvents(pAlarm)
SyncAlarm *pAlarm;
{
SyncAlarmClientList *pcl;
xSyncAlarmNotifyEvent ane;
SyncTrigger *pTrigger = &pAlarm->trigger;
UpdateCurrentTime();
ane.type = SyncEventBase + XSyncAlarmNotify;
ane.kind = XSyncAlarmNotify;
ane.alarm = pAlarm->alarm_id;
if (pTrigger->pCounter) {
ane.counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);
ane.counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);
}
else { /* XXX what else can we do if there's no counter? */
ane.counter_value_hi = ane.counter_value_lo = 0;
}
ane.alarm_value_hi = XSyncValueHigh32(pTrigger->test_value);
ane.alarm_value_lo = XSyncValueLow32(pTrigger->test_value);
ane.time = currentTime.milliseconds;
ane.state = pAlarm->state;
/* send to owner */
if (pAlarm->events && !pAlarm->client->clientGone)
WriteEventsToClient(pAlarm->client, 1, (xEvent *) &ane);
/* send to other interested clients */
for (pcl = pAlarm->pEventClients; pcl; pcl = pcl->next) {
if (!pAlarm->client->clientGone) {
WriteEventsToClient(pcl->client, 1, (xEvent *) &ane);
}
}
}
/* CounterNotify events only occur in response to an Await. The events
* go only to the Awaiting client.
*/
static void
SyncSendCounterNotifyEvents(client, ppAwait, num_events)
ClientPtr client;
SyncAwait **ppAwait;
int num_events;
{
xSyncCounterNotifyEvent *pEvents, *pev;
int i;
if (client->clientGone)
return;
pev = pEvents = (xSyncCounterNotifyEvent *)
ALLOCATE_LOCAL(num_events * sizeof(xSyncCounterNotifyEvent));
if (!pEvents)
return;
UpdateCurrentTime();
for (i = 0; i < num_events; i++, ppAwait++, pev++) {
SyncTrigger *pTrigger = &(*ppAwait)->trigger;
pev->type = SyncEventBase + XSyncCounterNotify;
pev->kind = XSyncCounterNotify;
pev->counter = pTrigger->pCounter->id;
pev->wait_value_lo = XSyncValueLow32(pTrigger->test_value);
pev->wait_value_hi = XSyncValueHigh32(pTrigger->test_value);
pev->counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value);
pev->counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value);
pev->time = currentTime.milliseconds;
pev->count = num_events - i - 1; /* events remaining */
pev->destroyed = pTrigger->pCounter->beingDestroyed;
}
/* swapping will be taken care of by this */
WriteEventsToClient(client, num_events, (xEvent *) pEvents);
DEALLOCATE_LOCAL(pEvents);
}
/* This function is called when an alarm's counter is destroyed.
* It is plugged into pTrigger->CounterDestroyed (for alarm triggers).
*/
void
SyncAlarmCounterDestroyed(pTrigger)
SyncTrigger *pTrigger;
{
SyncAlarm *pAlarm = (SyncAlarm *) pTrigger;
pAlarm->state = XSyncAlarmInactive;
SyncSendAlarmNotifyEvents(pAlarm);
pTrigger->pCounter = NULL;
}
/* This function is called when an alarm "goes off."
* It is plugged into pTrigger->TriggerFired (for alarm triggers).
*/
static void
SyncAlarmTriggerFired(pTrigger)
SyncTrigger *pTrigger;
{
SyncAlarm *pAlarm = (SyncAlarm *) pTrigger;
CARD64 new_test_value;
/* no need to check alarm unless it's active */
if (pAlarm->state != XSyncAlarmActive)
return;
/* " if the counter value is None, or if the delta is 0 and
* the test-type is PositiveComparison or NegativeComparison,
* no change is made to value (test-value) and the alarm
* state is changed to Inactive before the event is generated."
*/
if (pAlarm->trigger.pCounter == NULL || (XSyncValueIsZero(pAlarm->delta)
&& (pAlarm->trigger.test_type ==
XSyncPositiveComparison ||
pAlarm->trigger.test_type ==
XSyncNegativeComparison)))
pAlarm->state = XSyncAlarmInactive;
new_test_value = pAlarm->trigger.test_value;
if (pAlarm->state == XSyncAlarmActive) {
Bool overflow;
CARD64 oldvalue;
SyncTrigger *paTrigger = &pAlarm->trigger;
/* "The alarm is updated by repeatedly adding delta to the
* value of the trigger and re-initializing it until it
* becomes FALSE."
*/
oldvalue = paTrigger->test_value;
/* XXX really should do something smarter here */
do {
XSyncValueAdd(&paTrigger->test_value, paTrigger->test_value,
pAlarm->delta, &overflow);
} while (!overflow &&
(*paTrigger->CheckTrigger) (paTrigger,
paTrigger->pCounter->value));
new_test_value = paTrigger->test_value;
paTrigger->test_value = oldvalue;
/* "If this update would cause value to fall outside the range
* for an INT64...no change is made to value (test-value) and
* the alarm state is changed to Inactive before the event is
* generated."
*/
if (overflow) {
new_test_value = oldvalue;
pAlarm->state = XSyncAlarmInactive;
}
}
/* The AlarmNotify event has to have the "new state of the alarm"
* which we can't be sure of until this point. However, it has
* to have the "old" trigger test value. That's the reason for
* all the newvalue/oldvalue shuffling above. After we send the
* events, give the trigger its new test value.
*/
SyncSendAlarmNotifyEvents(pAlarm);
pTrigger->test_value = new_test_value;
}
/* This function is called when an Await unblocks, either as a result
* of the trigger firing OR the counter being destroyed.
* It goes into pTrigger->TriggerFired AND pTrigger->CounterDestroyed
* (for Await triggers).
*/
static void
SyncAwaitTriggerFired(pTrigger)
SyncTrigger *pTrigger;
{
SyncAwait *pAwait = (SyncAwait *) pTrigger;
int numwaits;
SyncAwaitUnion *pAwaitUnion;
SyncAwait **ppAwait;
int num_events = 0;
pAwaitUnion = (SyncAwaitUnion *) pAwait->pHeader;
numwaits = pAwaitUnion->header.num_waitconditions;
ppAwait = (SyncAwait **) ALLOCATE_LOCAL(numwaits * sizeof(SyncAwait *));
if (!ppAwait)
goto bail;
pAwait = &(pAwaitUnion + 1)->await;
/* "When a client is unblocked, all the CounterNotify events for
* the Await request are generated contiguously. If count is 0
* there are no more events to follow for this request. If
* count is n, there are at least n more events to follow."
*
* Thus, it is best to find all the counters for which events
* need to be sent first, so that an accurate count field can
* be stored in the events.
*/
for (; numwaits; numwaits--, pAwait++) {
CARD64 diff;
Bool overflow, diffgreater, diffequal;
/* "A CounterNotify event with the destroyed flag set to TRUE is
* always generated if the counter for one of the triggers is
* destroyed."
*/
if (pAwait->trigger.pCounter->beingDestroyed) {
ppAwait[num_events++] = pAwait;
continue;
}
/* "The difference between the counter and the test value is
* calculated by subtracting the test value from the value of
* the counter."
*/
XSyncValueSubtract(&diff, pAwait->trigger.pCounter->value,
pAwait->trigger.test_value, &overflow);
/* "If the difference lies outside the range for an INT64, an
* event is not generated."
*/
if (overflow)
continue;
diffgreater = XSyncValueGreaterThan(diff, pAwait->event_threshold);
diffequal = XSyncValueEqual(diff, pAwait->event_threshold);
/* "If the test-type is PositiveTransition or
* PositiveComparison, a CounterNotify event is generated if
* the difference is at least event-threshold. If the test-type
* is NegativeTransition or NegativeComparison, a CounterNotify
* event is generated if the difference is at most
* event-threshold."
*/
if (((pAwait->trigger.test_type == XSyncPositiveComparison ||
pAwait->trigger.test_type == XSyncPositiveTransition)
&& (diffgreater || diffequal))
||
((pAwait->trigger.test_type == XSyncNegativeComparison ||
pAwait->trigger.test_type == XSyncNegativeTransition)
&& (!diffgreater) /* less or equal */
)
) {
ppAwait[num_events++] = pAwait;
}
}
if (num_events)
SyncSendCounterNotifyEvents(pAwaitUnion->header.client, ppAwait,
num_events);
DEALLOCATE_LOCAL(ppAwait);
bail:
/* unblock the client */
AttendClient(pAwaitUnion->header.client);
/* delete the await */
FreeResource(pAwaitUnion->header.delete_id, RT_NONE);
}
/* This function should always be used to change a counter's value so that
* any triggers depending on the counter will be checked.
*/
void
SyncChangeCounter(pCounter, newval)
SyncCounter *pCounter;
CARD64 newval;
{
SyncTriggerList *ptl, *pnext;
CARD64 oldval;
oldval = pCounter->value;
pCounter->value = newval;
/* run through triggers to see if any become true */
for (ptl = pCounter->pTriglist; ptl; ptl = pnext) {
pnext = ptl->next;
if ((*ptl->pTrigger->CheckTrigger) (ptl->pTrigger, oldval))
(*ptl->pTrigger->TriggerFired) (ptl->pTrigger);
}
if (IsSystemCounter(pCounter)) {
SyncComputeBracketValues(pCounter, /* startOver */ FALSE);
}
}
/* loosely based on dix/events.c/EventSelectForWindow */
static Bool
SyncEventSelectForAlarm(pAlarm, client, wantevents)
SyncAlarm *pAlarm;
ClientPtr client;
Bool wantevents;
{
SyncAlarmClientList *pClients;
if (client == pAlarm->client) { /* alarm owner */
pAlarm->events = wantevents;
return Success;
}
/* see if the client is already on the list (has events selected) */
for (pClients = pAlarm->pEventClients; pClients; pClients = pClients->next) {
if (pClients->client == client) {
/* client's presence on the list indicates desire for
* events. If the client doesn't want events, remove it
* from the list. If the client does want events, do
* nothing, since it's already got them.
*/
if (!wantevents) {
FreeResource(pClients->delete_id, RT_NONE);
}
return Success;
}
}
/* if we get here, this client does not currently have
* events selected on the alarm
*/
if (!wantevents)
/* client doesn't want events, and we just discovered that it
* doesn't have them, so there's nothing to do.
*/
return Success;
/* add new client to pAlarm->pEventClients */
pClients = malloc(sizeof(SyncAlarmClientList));
if (!pClients)
return BadAlloc;
/* register it as a resource so it will be cleaned up
* if the client dies
*/
pClients->delete_id = FakeClientID(client->index);
if (!AddResource(pClients->delete_id, RTAlarmClient, pAlarm)) {
free(pClients);
return BadAlloc;
}
/* link it into list after we know all the allocations succeed */
pClients->next = pAlarm->pEventClients;
pAlarm->pEventClients = pClients;
pClients->client = client;
return Success;
}
/*
* ** SyncChangeAlarmAttributes ** This is used by CreateAlarm and ChangeAlarm
*/
static int
SyncChangeAlarmAttributes(client, pAlarm, mask, values)
ClientPtr client;
SyncAlarm *pAlarm;
Mask mask;
CARD32 *values;
{
int status;
XSyncCounter counter;
Mask origmask = mask;
counter = pAlarm->trigger.pCounter ? pAlarm->trigger.pCounter->id : None;
while (mask) {
int index2 = lowbit(mask);
mask &= ~index2;
switch (index2) {
case XSyncCACounter:
mask &= ~XSyncCACounter;
/* sanity check in SyncInitTrigger */
counter = *values++;
break;
case XSyncCAValueType:
mask &= ~XSyncCAValueType;
/* sanity check in SyncInitTrigger */
pAlarm->trigger.value_type = *values++;
break;
case XSyncCAValue:
mask &= ~XSyncCAValue;
XSyncIntsToValue(&pAlarm->trigger.wait_value, values[1], values[0]);
values += 2;
break;
case XSyncCATestType:
mask &= ~XSyncCATestType;
/* sanity check in SyncInitTrigger */
pAlarm->trigger.test_type = *values++;
break;
case XSyncCADelta:
mask &= ~XSyncCADelta;
XSyncIntsToValue(&pAlarm->delta, values[1], values[0]);
values += 2;
break;
case XSyncCAEvents:
mask &= ~XSyncCAEvents;
if ((*values != xTrue) && (*values != xFalse)) {
client->errorValue = *values;
return BadValue;
}
status = SyncEventSelectForAlarm(pAlarm, client,
(Bool) (*values++));
if (status != Success)
return status;
break;
default:
client->errorValue = mask;
return BadValue;
}
}
/* "If the test-type is PositiveComparison or PositiveTransition
* and delta is less than zero, or if the test-type is
* NegativeComparison or NegativeTransition and delta is
* greater than zero, a Match error is generated."
*/
if (origmask & (XSyncCADelta | XSyncCATestType)) {
CARD64 zero;
XSyncIntToValue(&zero, 0);
if ((((pAlarm->trigger.test_type == XSyncPositiveComparison) ||
(pAlarm->trigger.test_type == XSyncPositiveTransition))
&& XSyncValueLessThan(pAlarm->delta, zero))
||
(((pAlarm->trigger.test_type == XSyncNegativeComparison) ||
(pAlarm->trigger.test_type == XSyncNegativeTransition))
&& XSyncValueGreaterThan(pAlarm->delta, zero))
) {
return BadMatch;
}
}
/* postpone this until now, when we're sure nothing else can go wrong */
if ((status = SyncInitTrigger(client, &pAlarm->trigger, counter,
origmask & XSyncCAAllTrigger)) != Success)
return status;
/* XXX spec does not really say to do this - needs clarification */
pAlarm->state = XSyncAlarmActive;
return Success;
}