/
IOTimerEventSource.cpp
329 lines (280 loc) · 8.93 KB
/
IOTimerEventSource.cpp
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/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* IOTimerEventSource.cpp
*
* HISTORY
* 2-Feb-1999 Joe Liu (jliu) created.
* 1999-10-14 Godfrey van der Linden(gvdl)
* Revamped to use thread_call APIs
*
*/
#include <sys/cdefs.h>
__BEGIN_DECLS
#include <kern/thread_call.h>
__END_DECLS
#include <IOKit/assert.h>
#include <IOKit/system.h>
#include <IOKit/IOLib.h>
#include <IOKit/IOTimerEventSource.h>
#include <IOKit/IOWorkLoop.h>
#include <IOKit/IOTimeStamp.h>
#define super IOEventSource
OSDefineMetaClassAndStructors(IOTimerEventSource, IOEventSource)
OSMetaClassDefineReservedUnused(IOTimerEventSource, 0);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 1);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 2);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 3);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 4);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 5);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 6);
OSMetaClassDefineReservedUnused(IOTimerEventSource, 7);
//
// reserved != 0 means IOTimerEventSource::timeoutAndRelease is being used,
// not a subclassed implementation.
//
bool IOTimerEventSource::checkForWork() { return false; }
// Timeout handler function. This function is called by the kernel when
// the timeout interval expires.
//
void IOTimerEventSource::timeout(void *self)
{
IOTimerEventSource *me = (IOTimerEventSource *) self;
if (me->enabled && me->action)
{
IOWorkLoop *
wl = me->workLoop;
if (wl)
{
Action doit;
wl->closeGate();
doit = (Action) me->action;
if (doit && me->enabled && AbsoluteTime_to_scalar(&me->abstime))
{
IOTimeStampConstant(IODBG_TIMES(IOTIMES_ACTION),
(uintptr_t) doit, (uintptr_t) me->owner);
(*doit)(me->owner, me);
}
wl->openGate();
}
}
}
void IOTimerEventSource::timeoutAndRelease(void * self, void * c)
{
IOTimerEventSource *me = (IOTimerEventSource *) self;
/* The second parameter (a pointer) gets abused to carry an SInt32, so on LP64, "count"
must be cast to "long" before, in order to tell GCC we're not truncating a pointer. */
SInt32 count = (SInt32) (long) c;
if (me->enabled && me->action)
{
IOWorkLoop *
wl = me->reserved->workLoop;
if (wl)
{
Action doit;
wl->closeGate();
doit = (Action) me->action;
if (doit && (me->reserved->calloutGeneration == count))
{
IOTimeStampConstant(IODBG_TIMES(IOTIMES_ACTION),
(uintptr_t) doit, (uintptr_t) me->owner);
(*doit)(me->owner, me);
}
wl->openGate();
}
}
me->reserved->workLoop->release();
me->release();
}
void IOTimerEventSource::setTimeoutFunc()
{
// reserved != 0 means IOTimerEventSource::timeoutAndRelease is being used,
// not a subclassed implementation
reserved = IONew(ExpansionData, 1);
calloutEntry = (void *) thread_call_allocate((thread_call_func_t) &IOTimerEventSource::timeoutAndRelease,
(thread_call_param_t) this);
}
bool IOTimerEventSource::init(OSObject *inOwner, Action inAction)
{
if (!super::init(inOwner, (IOEventSource::Action) inAction) )
return false;
setTimeoutFunc();
if (!calloutEntry)
return false;
return true;
}
IOTimerEventSource *
IOTimerEventSource::timerEventSource(OSObject *inOwner, Action inAction)
{
IOTimerEventSource *me = new IOTimerEventSource;
if (me && !me->init(inOwner, inAction)) {
me->release();
return 0;
}
return me;
}
void IOTimerEventSource::free()
{
if (calloutEntry) {
cancelTimeout();
thread_call_free((thread_call_t) calloutEntry);
}
if (reserved)
IODelete(reserved, ExpansionData, 1);
super::free();
}
void IOTimerEventSource::cancelTimeout()
{
if (reserved)
reserved->calloutGeneration++;
bool active = thread_call_cancel((thread_call_t) calloutEntry);
AbsoluteTime_to_scalar(&abstime) = 0;
if (active && reserved)
{
release();
workLoop->release();
}
}
void IOTimerEventSource::enable()
{
super::enable();
if (kIOReturnSuccess != wakeAtTime(abstime))
super::disable(); // Problem re-scheduling timeout ignore enable
}
void IOTimerEventSource::disable()
{
if (reserved)
reserved->calloutGeneration++;
bool active = thread_call_cancel((thread_call_t) calloutEntry);
super::disable();
if (active && reserved)
{
release();
workLoop->release();
}
}
IOReturn IOTimerEventSource::setTimeoutTicks(UInt32 ticks)
{
return setTimeout(ticks, kTickScale);
}
IOReturn IOTimerEventSource::setTimeoutMS(UInt32 ms)
{
return setTimeout(ms, kMillisecondScale);
}
IOReturn IOTimerEventSource::setTimeoutUS(UInt32 us)
{
return setTimeout(us, kMicrosecondScale);
}
IOReturn IOTimerEventSource::setTimeout(UInt32 interval, UInt32 scale_factor)
{
AbsoluteTime end;
clock_interval_to_deadline(interval, scale_factor, &end);
return wakeAtTime(end);
}
#if !defined(__LP64__)
IOReturn IOTimerEventSource::setTimeout(mach_timespec_t interval)
{
AbsoluteTime end, nsecs;
clock_interval_to_absolutetime_interval
(interval.tv_nsec, kNanosecondScale, &nsecs);
clock_interval_to_deadline
(interval.tv_sec, NSEC_PER_SEC, &end);
ADD_ABSOLUTETIME(&end, &nsecs);
return wakeAtTime(end);
}
#endif
IOReturn IOTimerEventSource::setTimeout(AbsoluteTime interval)
{
AbsoluteTime end;
clock_get_uptime(&end);
ADD_ABSOLUTETIME(&end, &interval);
return wakeAtTime(end);
}
IOReturn IOTimerEventSource::wakeAtTimeTicks(UInt32 ticks)
{
return wakeAtTime(ticks, kTickScale);
}
IOReturn IOTimerEventSource::wakeAtTimeMS(UInt32 ms)
{
return wakeAtTime(ms, kMillisecondScale);
}
IOReturn IOTimerEventSource::wakeAtTimeUS(UInt32 us)
{
return wakeAtTime(us, kMicrosecondScale);
}
IOReturn IOTimerEventSource::wakeAtTime(UInt32 inAbstime, UInt32 scale_factor)
{
AbsoluteTime end;
clock_interval_to_absolutetime_interval(inAbstime, scale_factor, &end);
return wakeAtTime(end);
}
#if !defined(__LP64__)
IOReturn IOTimerEventSource::wakeAtTime(mach_timespec_t inAbstime)
{
AbsoluteTime end, nsecs;
clock_interval_to_absolutetime_interval
(inAbstime.tv_nsec, kNanosecondScale, &nsecs);
clock_interval_to_absolutetime_interval
(inAbstime.tv_sec, kSecondScale, &end);
ADD_ABSOLUTETIME(&end, &nsecs);
return wakeAtTime(end);
}
#endif
void IOTimerEventSource::setWorkLoop(IOWorkLoop *inWorkLoop)
{
super::setWorkLoop(inWorkLoop);
if ( enabled && AbsoluteTime_to_scalar(&abstime) && workLoop )
wakeAtTime(abstime);
}
IOReturn IOTimerEventSource::wakeAtTime(AbsoluteTime inAbstime)
{
if (!action)
return kIOReturnNoResources;
abstime = inAbstime;
if ( enabled && AbsoluteTime_to_scalar(&inAbstime) && AbsoluteTime_to_scalar(&abstime) && workLoop )
{
if (reserved)
{
retain();
workLoop->retain();
reserved->workLoop = workLoop;
reserved->calloutGeneration++;
if (thread_call_enter1_delayed((thread_call_t) calloutEntry,
(void *) reserved->calloutGeneration, inAbstime))
{
release();
workLoop->release();
}
}
else
thread_call_enter_delayed((thread_call_t) calloutEntry, inAbstime);
}
return kIOReturnSuccess;
}