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Annotation of XNU/iokit/Kernel/IOTimerEventSource.cpp, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1999 Apple Computer, Inc.  All rights reserved. 
        !            24:  *
        !            25:  * IOTimerEventSource.cpp
        !            26:  *
        !            27:  * HISTORY
        !            28:  * 2-Feb-1999          Joe Liu (jliu) created.
        !            29:  * 1999-10-14          Godfrey van der Linden(gvdl)
        !            30:  *             Revamped to use thread_call APIs
        !            31:  *
        !            32:  */
        !            33: 
        !            34: #include <sys/cdefs.h>
        !            35: 
        !            36: __BEGIN_DECLS
        !            37: #include <kern/thread_call.h>
        !            38: __END_DECLS
        !            39: 
        !            40: #include <IOKit/assert.h>
        !            41: #include <IOKit/system.h>
        !            42: 
        !            43: #include <IOKit/IOLib.h>
        !            44: #include <IOKit/IOTimerEventSource.h>
        !            45: #include <IOKit/IOWorkLoop.h>
        !            46: 
        !            47: #include <IOKit/IOTimeStamp.h>
        !            48: 
        !            49: #define super IOEventSource
        !            50: OSDefineMetaClassAndStructors( IOTimerEventSource, IOEventSource )
        !            51: 
        !            52: bool IOTimerEventSource::checkForWork() { return false; }
        !            53: 
        !            54: // Timeout handler function. This function is called by the kernel when
        !            55: // the timeout interval expires.
        !            56: //
        !            57: void IOTimerEventSource::timeout(void *self)
        !            58: {
        !            59:     IOTimerEventSource *me = (IOTimerEventSource *) self;
        !            60: 
        !            61:     if (me->enabled) {
        !            62:         Action doit = (Action) me->action;
        !            63: 
        !            64:         if (doit) {
        !            65:             IOWorkLoop *loop = me->workLoop;
        !            66: 
        !            67:             IOTimeStampConstant(IODBG_TIMES(IOTIMES_ACTION),
        !            68:                                 (unsigned int) doit, (unsigned int) me->owner);
        !            69:             loop->closeGate();
        !            70:             (*doit)(me->owner, me);
        !            71:             loop->openGate();
        !            72:         }
        !            73:     }
        !            74: }
        !            75: 
        !            76: void IOTimerEventSource::setTimeoutFunc()
        !            77: {
        !            78:     calloutEntry = (void *) thread_call_allocate((thread_call_func_t) timeout,
        !            79:                                                  (thread_call_param_t) this);
        !            80: }
        !            81: 
        !            82: bool IOTimerEventSource::init(OSObject *inOwner, Action inAction)
        !            83: {
        !            84:     if (!super::init(inOwner, (IOEventSource::Action) inAction) )
        !            85:         return false;
        !            86: 
        !            87:     setTimeoutFunc();
        !            88:     if (!calloutEntry)
        !            89:         return false;
        !            90: 
        !            91:     return true;
        !            92: }
        !            93: 
        !            94: IOTimerEventSource *
        !            95: IOTimerEventSource::timerEventSource(OSObject *inOwner, Action inAction)
        !            96: {
        !            97:     IOTimerEventSource *me = new IOTimerEventSource;
        !            98: 
        !            99:     if (me && !me->init(inOwner, inAction)) {
        !           100:         me->free();
        !           101:         return 0;
        !           102:     }
        !           103: 
        !           104:     return me;
        !           105: }
        !           106: 
        !           107: void IOTimerEventSource::free()
        !           108: {
        !           109:     if (calloutEntry) {
        !           110:         cancelTimeout();
        !           111:         thread_call_free((thread_call_t) calloutEntry);    
        !           112:     }
        !           113: 
        !           114:     super::free();
        !           115: }
        !           116: 
        !           117: void IOTimerEventSource::cancelTimeout()
        !           118: {
        !           119:     thread_call_cancel((thread_call_t) calloutEntry);
        !           120:     AbsoluteTime_to_scalar(&abstime) = 0;
        !           121: }
        !           122: 
        !           123: void IOTimerEventSource::enable()
        !           124: {
        !           125:     super::enable();
        !           126:     if (kIOReturnSuccess != wakeAtTime(abstime))
        !           127:         super::disable(); // Problem re-scheduling timeout ignore enable
        !           128: }
        !           129: 
        !           130: void IOTimerEventSource::disable()
        !           131: {
        !           132:     thread_call_cancel((thread_call_t) calloutEntry);
        !           133:     super::disable();
        !           134: }
        !           135: 
        !           136: IOReturn IOTimerEventSource::setTimeoutTicks(UInt32 ticks)
        !           137: {
        !           138:     return setTimeout(ticks, NSEC_PER_SEC/hz);
        !           139: }
        !           140: 
        !           141: IOReturn IOTimerEventSource::setTimeoutMS(UInt32 ms)
        !           142: {
        !           143:     return setTimeout(ms, kMillisecondScale);
        !           144: }
        !           145: 
        !           146: IOReturn IOTimerEventSource::setTimeoutUS(UInt32 us)
        !           147: {
        !           148:     return setTimeout(us, kMicrosecondScale);
        !           149: }
        !           150: 
        !           151: IOReturn IOTimerEventSource::setTimeout(UInt32 interval, UInt32 scale_factor)
        !           152: {
        !           153:     AbsoluteTime end;
        !           154: 
        !           155:     clock_interval_to_deadline(interval, scale_factor, &end);
        !           156:     return wakeAtTime(end);
        !           157: }
        !           158: 
        !           159: IOReturn IOTimerEventSource::setTimeout(mach_timespec_t interval)
        !           160: {
        !           161:     AbsoluteTime end, nsecs;
        !           162: 
        !           163:     clock_interval_to_absolutetime_interval
        !           164:         (interval.tv_nsec, kNanosecondScale, &nsecs);
        !           165:     clock_interval_to_deadline
        !           166:         (interval.tv_sec, NSEC_PER_SEC, &end);
        !           167:     ADD_ABSOLUTETIME(&end, &nsecs);
        !           168: 
        !           169:     return wakeAtTime(end);
        !           170: }
        !           171: 
        !           172: IOReturn IOTimerEventSource::setTimeout(AbsoluteTime interval)
        !           173: {
        !           174:     AbsoluteTime end;
        !           175: 
        !           176:     clock_get_uptime(&end);
        !           177:     ADD_ABSOLUTETIME(&end, &interval);
        !           178: 
        !           179:     return wakeAtTime(end);
        !           180: }
        !           181: 
        !           182: IOReturn IOTimerEventSource::wakeAtTimeTicks(UInt32 ticks)
        !           183: {
        !           184:     return wakeAtTime(ticks, NSEC_PER_SEC/hz);
        !           185: }
        !           186: 
        !           187: IOReturn IOTimerEventSource::wakeAtTimeMS(UInt32 ms)
        !           188: {
        !           189:     return wakeAtTime(ms, kMillisecondScale);
        !           190: }
        !           191: 
        !           192: IOReturn IOTimerEventSource::wakeAtTimeUS(UInt32 us)
        !           193: {
        !           194:     return wakeAtTime(us, kMicrosecondScale);
        !           195: }
        !           196: 
        !           197: IOReturn IOTimerEventSource::wakeAtTime(UInt32 abstime, UInt32 scale_factor)
        !           198: {
        !           199:     AbsoluteTime end;
        !           200:     clock_interval_to_absolutetime_interval(abstime, scale_factor, &end);
        !           201: 
        !           202:     return wakeAtTime(end);
        !           203: }
        !           204: 
        !           205: IOReturn IOTimerEventSource::wakeAtTime(mach_timespec_t abstime)
        !           206: {
        !           207:     AbsoluteTime end, nsecs;
        !           208: 
        !           209:     clock_interval_to_absolutetime_interval
        !           210:         (abstime.tv_nsec, kNanosecondScale, &nsecs);
        !           211:     clock_interval_to_absolutetime_interval
        !           212:         (abstime.tv_sec, kSecondScale, &end);
        !           213:     ADD_ABSOLUTETIME(&end, &nsecs);
        !           214: 
        !           215:     return wakeAtTime(end);
        !           216: }
        !           217: 
        !           218: IOReturn IOTimerEventSource::wakeAtTime(AbsoluteTime inAbstime)
        !           219: {
        !           220:     if (!action)
        !           221:         return kIOReturnNoResources;
        !           222: 
        !           223:     abstime = inAbstime;
        !           224:     if ( enabled && AbsoluteTime_to_scalar(&abstime) )
        !           225:         thread_call_enter_delayed((thread_call_t) calloutEntry, abstime);
        !           226: 
        !           227:     return kIOReturnSuccess;
        !           228: }

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