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Annotation of XNU/iokit/Kernel/IOCommandGate.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: #include <IOKit/IOCommandGate.h>
        !            23: #include <IOKit/IOWorkLoop.h>
        !            24: #include <IOKit/IOReturn.h>
        !            25: #include <IOKit/IOTimeStamp.h>
        !            26: 
        !            27: #define super IOEventSource
        !            28: 
        !            29: OSDefineMetaClassAndStructors(IOCommandGate, IOEventSource)
        !            30: 
        !            31: bool IOCommandGate::checkForWork() { return false; }
        !            32: 
        !            33: bool IOCommandGate::init(OSObject *inOwner, Action inAction = 0)
        !            34: {
        !            35:     return super::init(inOwner, (IOEventSource::Action) inAction);
        !            36: }
        !            37: 
        !            38: IOCommandGate *
        !            39: IOCommandGate::commandGate(OSObject *inOwner, Action inAction = 0)
        !            40: {
        !            41:     IOCommandGate *me = new IOCommandGate;
        !            42: 
        !            43:     if (me && !me->init(inOwner, inAction)) {
        !            44:         me->free();
        !            45:         return 0;
        !            46:     }
        !            47: 
        !            48:     return me;
        !            49: }
        !            50: 
        !            51: IOReturn IOCommandGate::runCommand(void *arg0 = 0, void *arg1 = 0,
        !            52:                                    void *arg2 = 0, void *arg3 = 0)
        !            53: {
        !            54:     IOReturn res;
        !            55: 
        !            56:     if (!enabled)
        !            57:         return kIOReturnNotPermitted;
        !            58: 
        !            59:     if (!action)
        !            60:         return kIOReturnNoResources;
        !            61: 
        !            62:     // closeGate is recursive so don't worry if we already hold the lock.
        !            63:     IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
        !            64:                        (unsigned int) action, (unsigned int) owner);
        !            65: 
        !            66:     workLoop->closeGate();
        !            67:     res = (*(Action) action)(owner, arg0, arg1, arg2, arg3);
        !            68:     workLoop->openGate();
        !            69: 
        !            70:     return res;
        !            71: }
        !            72: 
        !            73: IOReturn IOCommandGate::runAction(Action inAction,
        !            74:                                   void *arg0 = 0, void *arg1 = 0,
        !            75:                                   void *arg2 = 0, void *arg3 = 0)
        !            76: {
        !            77:     IOReturn res;
        !            78: 
        !            79:     if (!enabled)
        !            80:         return kIOReturnNotPermitted;
        !            81: 
        !            82:     if (!inAction)
        !            83:         return kIOReturnBadArgument;
        !            84: 
        !            85:     IOTimeStampConstant(IODBG_CMDQ(IOCMDQ_ACTION),
        !            86:                        (unsigned int) inAction, (unsigned int) owner);
        !            87: 
        !            88:     // closeGate is recursive so don't worry if we already hold the lock.
        !            89:     workLoop->closeGate();
        !            90:     res = (*inAction)(owner, arg0, arg1, arg2, arg3);
        !            91:     workLoop->openGate();
        !            92: 
        !            93:     return res;
        !            94: }

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