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Annotation of XNU/iokit/Kernel/IOCommandGate.cpp, revision 1.1.1.1

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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