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Annotation of XNU/iokit/Kernel/IOSyncer.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: /* IOSyncer.cpp created by wgulland on 2000-02-02 */
                     23: 
                     24: #include <IOKit/IOLib.h>
                     25: #include <IOKit/IOSyncer.h>
                     26: 
                     27: OSDefineMetaClassAndStructors(IOSyncer, OSObject)
                     28: 
                     29: IOSyncer * IOSyncer::create(bool twoRetains)
                     30: {
                     31:     IOSyncer * me = new IOSyncer;
                     32: 
                     33:     if (me && !me->init(twoRetains)) {
                     34:         me->release();
                     35:         return 0;
                     36:     }
                     37: 
                     38:     return me;
                     39: }
                     40: 
                     41: bool IOSyncer::init(bool twoRetains)
                     42: {
                     43:     if (!OSObject::init())
                     44:         return false;
                     45: 
                     46:     fLock = lock_alloc(true, NULL, NULL);
                     47: 
                     48:     if(!fLock)
                     49:        return false;
                     50: 
                     51:     lock_write(fLock);
                     52:     if(twoRetains)
                     53:        retain();
                     54: 
                     55:     return true;
                     56: }
                     57: 
                     58: void IOSyncer::reinit()
                     59: {
                     60:     lock_write(fLock);
                     61: }
                     62: 
                     63: void IOSyncer::free()
                     64: {
                     65:     if(fLock)
                     66:        lock_free(fLock);
                     67:     OSObject::free();
                     68: }
                     69: 
                     70: IOReturn IOSyncer::wait(bool autoRelease = true)
                     71: {
                     72:     IOReturn result;
                     73:     lock_write(fLock);
                     74:     lock_done(fLock);
                     75:     result = fResult;  // Pick up before auto deleting!
                     76:     if(autoRelease)
                     77:        release();
                     78:     return result;
                     79: }
                     80: 
                     81: void IOSyncer::signal(IOReturn res = kIOReturnSuccess,
                     82:                                        bool autoRelease = true)
                     83: {
                     84:     fResult = res;
                     85:     lock_done(fLock);
                     86:     if(autoRelease)
                     87:        release();
                     88: }
                     89: 

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