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Annotation of driverkit/tests/timertest.m, revision 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: /*
        !            25:  * User-level libIO timer test.
        !            26:  */
        !            27:  
        !            28: #import <objc/Object.h>
        !            29: #import <driverkit/generalFuncs.h>
        !            30: #import <libc.h>
        !            31: #import <driverkit/Device_ddm.h>
        !            32: 
        !            33: #define DO_DDM_DEBUG 1
        !            34: 
        !            35: static void usage(char **argv);
        !            36: 
        !            37: ns_time_t last_time = 0;
        !            38: int callout_interval = 10;
        !            39: 
        !            40: static void callFcn()
        !            41: {
        !            42:        printf("Callout\n");
        !            43:        IOScheduleFunc((IOThreadFunc)callFcn, NULL, callout_interval);
        !            44: }
        !            45: 
        !            46: int main(int argc, char **argv)
        !            47: {
        !            48:        int loop;
        !            49:        ns_time_t current_time;
        !            50:        unsigned delta;
        !            51:        unsigned long long delta_l;
        !            52:        int arg;
        !            53:        struct tsval ts;
        !            54:        
        !            55:        if(argc > 2)
        !            56:                usage(argv);
        !            57:        for(arg=1; arg<argc; arg++) {
        !            58:                switch(argv[arg][0]) {
        !            59:                    case 'c':
        !            60:                        callout_interval = atoi(&argv[arg][2]);
        !            61:                        break;
        !            62:                    default:
        !            63:                        usage(argv);
        !            64:                }
        !            65:        }
        !            66:        IOInitGeneralFuncs();
        !            67: #ifdef DO_DDM_DEBUG
        !            68:        IOInitDDM(1000, "libIOxpr");
        !            69:        IOSetDDMMask(XPR_IODEVICE_INDEX, XPR_LIBIO);
        !            70: #endif DO_DDM_DEBUG
        !            71:        printf("Should see one loop every second, and a callout every %d "
        !            72:                "loops\n\n", callout_interval);
        !            73:        IOScheduleFunc((IOThreadFunc)callFcn, NULL, callout_interval);
        !            74:        for(loop=0; ; loop++) {
        !            75:                IOGetTimestamp(&current_time);
        !            76:                delta_l = current_time - last_time;
        !            77:                delta = delta_l;
        !            78:                kern_timestamp(&ts);
        !            79:                printf("...loop %d delta %u ns tsval %u:%u\n", 
        !            80:                        loop, (unsigned)delta_l, ts.high_val, ts.low_val);
        !            81:                /*
        !            82:                 * eliminate printf latency...
        !            83:                 */
        !            84:                IOGetTimestamp(&last_time);
        !            85:                
        !            86:                /*
        !            87:                 * alternate between IODelay and IOSleep...
        !            88:                 */
        !            89:                if(loop & 1) {
        !            90:                        IOSleep(1000);
        !            91:                }
        !            92:                else {
        !            93:                        IODelay(1000000);
        !            94:                }
        !            95:        }       
        !            96: }
        !            97: 
        !            98: static void usage(char **argv)
        !            99: {
        !           100:        printf("usage: %s [c=c(allout interval)]\n");
        !           101:        exit(1);
        !           102: }

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