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Annotation of driverkit/Examples/IOStub/IOStubThread.m, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: /*     IOStubThread.m          1.0     02/04/91        (c) 1991 NeXT   
                     25:  *
                     26:  * IOStubThread.m - IOStub Device Thread support.
                     27:  *
                     28:  * HISTORY
                     29:  * 04-Feb-91    Doug Mitchell at NeXT
                     30:  *      Created.
                     31:  */
                     32: 
                     33: #import <bsd/sys/types.h>
                     34: #import <mach/cthreads.h>
                     35: #import <driverkit/IODevice.h>
                     36: #import "IOStub.h"
                     37: #import "IOStubThread.h"
                     38: #import "IOStubDevice.h"
                     39: #import "IOStubUxpr.h"
                     40: #import <bsd/libc.h>
                     41: #import <machkit/NXLock.h>
                     42: 
                     43: @implementation IOStub(Thread)
                     44: 
                     45: /*
                     46:  * Enqueue an IOBuf on IOQueue and wake up anyone who might be waiting 
                     47:  * for something to do.
                     48:  */
                     49: - (void)enqueueIoBuf : (IOBuf_t *)buf
                     50: {
                     51:        xpr_stub("enqueueIoBuf: IOBuf 0x%x\n", buf, 2,3,4,5);
                     52:        [ioQLock lock];
                     53:        queue_enter(&ioQueue, buf, IOBuf_t *, link);
                     54:        [ioQLock unlockWith:WORK_AVAILABLE];
                     55: }
                     56: 
                     57: /*
                     58:  * Get an IOBuf from ioQueue. Blocks if necessary.
                     59:  */
                     60: - (IOBuf_t *)dequeueIoBuf
                     61: {
                     62:        IOBuf_t *buf;
                     63:        
                     64:        xpr_stub("dequeueIoBuf: entry\n", 1,2,3,4,5);
                     65:        [ioQLock lockWhen:WORK_AVAILABLE];
                     66:        buf = (IOBuf_t *)queue_first(&ioQueue);
                     67:        queue_remove(&ioQueue, buf, IOBuf_t *, link);
                     68:        if(queue_empty(&ioQueue))
                     69:                [ioQLock unlockWith:NO_WORK_AVAILABLE];
                     70:        else
                     71:                [ioQLock unlockWith:WORK_AVAILABLE];
                     72:        return buf;
                     73: }
                     74: 
                     75: @end
                     76: 
                     77: /*
                     78:  * I/O thread. This handles IOBufs which have been enqueued by 
                     79:  * exported methods (like read: and write:).
                     80:  *
                     81:  * This thread merely loops doing the  following:
                     82:  *    -- get an IOBuf off of the IOQueue.
                     83:  *    -- perform the task specified. 
                     84:  *    -- if async request, ioComplete: the result, else 
                     85:  *      condition_signal() the waiting thread.
                     86:  */
                     87:  
                     88: volatile void IOStub_thread(IOStub *stubId)
                     89: {
                     90:        IOBuf_t *IOBuf;
                     91:        
                     92:        xpr_stub("IOStub_thread: starting\n", 1,2,3,4,5);
                     93:        while(1) {
                     94:                IOBuf = [stubId dequeueIoBuf];  
                     95:                xpr_stub("IOStub_thread: IOBuf 0x%x received\n", IOBuf,
                     96:                        2,3,4,5); 
                     97:        
                     98:                switch(IOBuf->cmd) {    
                     99:                    case STUB_READ:
                    100:                        [stubId deviceRead:IOBuf];
                    101:                        break;      
                    102:                    case STUB_WRITE:
                    103:                        [stubId deviceWrite:IOBuf];
                    104:                        break;      
                    105:                    case STUB_ZERO:
                    106:                        [stubId deviceZero:IOBuf];
                    107:                        break;      
                    108:                    case STUB_ABORT:
                    109:                        /*
                    110:                         * I/O complete this request before we die.
                    111:                         */
                    112:                        [IOBuf->waitLock unlockWith:YES];
                    113:                        IOExitThread();
                    114:                        break;
                    115:                }                       
                    116:        }
                    117:        /* NOT REACHED */
                    118: }
                    119: 
                    120: /* end of IOThread.m */

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