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Annotation of kernel/machdep/i386/pc_support/PCtimers.c, 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: /*
        !            26:  * Copyright (c) 1993 NeXT Computer, Inc.
        !            27:  *
        !            28:  * Timeout and tick support.
        !            29:  *
        !            30:  * HISTORY
        !            31:  *
        !            32:  * 30 Mar 1993 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35: 
        !            36: #import <mach/mach_types.h>
        !            37: 
        !            38: #import <kern/thread_call.h>
        !            39: 
        !            40: #import "PCprivate.h"
        !            41: 
        !            42: static
        !            43: void PCpendTimeout(
        !            44:        PCcontext_t             context);
        !            45: 
        !            46: static
        !            47: void PCpendTick(
        !            48:        PCcontext_t             context);
        !            49: 
        !            50: #define TVALSPEC_USEC(usec)            \
        !            51:        ((tvalspec_t) { ((usec) / USEC_PER_SEC), ((usec) * NSEC_PER_USEC) } )
        !            52: 
        !            53: static __inline__
        !            54: void
        !            55: PCscheduleTimeout(
        !            56:     PCcontext_t                context
        !            57: )
        !            58: {
        !            59:     context->pendingTimers &= ~PC_CALL_TIMEOUT;
        !            60: 
        !            61:     if (context->expectedTimers & PC_CALL_TIMEOUT)
        !            62:        thread_call_func_cancel(
        !            63:                        (thread_call_func_t)PCpendTimeout, context, FALSE);
        !            64:     
        !            65:     if (context->runOptions & PC_RUN_TIMEOUT) {
        !            66:        thread_call_func_delayed(
        !            67:                (thread_call_func_t)PCpendTimeout, context,
        !            68:                        deadline_from_interval(
        !            69:                                TVALSPEC_USEC(context->timeout)));
        !            70:     
        !            71:        context->expectedTimers |= PC_CALL_TIMEOUT;
        !            72:     }
        !            73:     else
        !            74:        context->expectedTimers &= ~PC_CALL_TIMEOUT;
        !            75: }
        !            76: 
        !            77: static
        !            78: void
        !            79: PCpendTimeout(
        !            80:     PCcontext_t                context
        !            81: )
        !            82: {
        !            83:     if (context->expectedTimers & PC_CALL_TIMEOUT) {
        !            84:        if (context->running)
        !            85:            context->pendingTimers |= PC_CALL_TIMEOUT;
        !            86:        
        !            87:        context->expectedTimers &= ~PC_CALL_TIMEOUT;
        !            88:     }
        !            89: }
        !            90: 
        !            91: static __inline__
        !            92: void
        !            93: PCscheduleTick(
        !            94:     PCcontext_t                context
        !            95: )
        !            96: {
        !            97:     if (context->pendingTimers & PC_CALL_TICK) {
        !            98:        context->pendingCallbacks |= PC_CALL_TICK;
        !            99: 
        !           100:        context->pendingTimers &= ~PC_CALL_TICK;
        !           101:     }
        !           102:     
        !           103:     if (context->expectedTimers & PC_CALL_TICK)
        !           104:        /* do nothing */;
        !           105:     else if (context->runOptions & PC_RUN_TICK) {      
        !           106:        thread_call_func_delayed(
        !           107:                (thread_call_func_t)PCpendTick, context,
        !           108:                        deadline_from_interval(
        !           109:                                TVALSPEC_USEC(context->tick)));
        !           110:        
        !           111:        context->expectedTimers |= PC_CALL_TICK;
        !           112:     }
        !           113: }
        !           114: 
        !           115: static
        !           116: void
        !           117: PCpendTick(
        !           118:     PCcontext_t                context
        !           119: )
        !           120: {
        !           121:     if (context->expectedTimers & PC_CALL_TICK) {
        !           122:        context->pendingTimers |= PC_CALL_TICK;
        !           123:        
        !           124:        context->expectedTimers &= ~PC_CALL_TICK;
        !           125:     }
        !           126: }
        !           127:        
        !           128: void
        !           129: PCscheduleTimers(
        !           130:     PCcontext_t                context
        !           131: )
        !           132: {
        !           133:     PCscheduleTimeout(context);
        !           134:        
        !           135:     PCscheduleTick(context);
        !           136: }
        !           137: 
        !           138: void
        !           139: PCdeliverTimers(
        !           140:     PCcontext_t                context
        !           141: )
        !           142: {
        !           143:     context->pendingCallbacks |= 
        !           144:        context->pendingTimers & (PC_CALL_TIMEOUT | PC_CALL_TICK);
        !           145:        
        !           146:     context->pendingTimers &= ~(PC_CALL_TIMEOUT | PC_CALL_TICK);
        !           147: }
        !           148: 
        !           149: boolean_t
        !           150: PCtimersPending(
        !           151:     PCcontext_t                context
        !           152: )
        !           153: {
        !           154:     boolean_t          pending;
        !           155:     
        !           156:     pending = (context->pendingTimers & (PC_CALL_TIMEOUT | PC_CALL_TICK)) != 0;
        !           157:     
        !           158:     return (pending);
        !           159: }
        !           160: 
        !           161: void
        !           162: PCcancelTimers(
        !           163:     PCcontext_t                context
        !           164: )
        !           165: {
        !           166:     thread_call_func_cancel(
        !           167:                (thread_call_func_t)PCpendTimeout, context, FALSE);
        !           168:     thread_call_func_cancel(
        !           169:                (thread_call_func_t)PCpendTick, context, FALSE);
        !           170: }
        !           171: 
        !           172: void
        !           173: PCcancelAllTimers(
        !           174:     thread_t           thread
        !           175: )
        !           176: {
        !           177:     PCshared_t         shared = threadPCShared(thread);
        !           178:     int                        i;
        !           179:        
        !           180:     for (i = 0; i < PCMAXCONTEXT; i++)
        !           181:        PCcancelTimers(&shared->contexts[i]);
        !           182: }

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