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152 lines
3.4 KiB
152 lines
3.4 KiB
title "Event Pair Support"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; evpair.asm
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;
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; Abstract:
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;
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;
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; This module contains the implementation for the fast event pair
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; system services that are used for client/server synchronization.
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; sethiwaitlo, setlowaithi.
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;
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;
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; Author:
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;
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; Mark Lucovsky (markl) 03-Feb-1992
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;
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; Environment:
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;
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; Kernel mode.
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;
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; Revision History:
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;
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;
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;--
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.386p
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; .xlist
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include ks386.inc
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include callconv.inc ; calling convention macros
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; .list
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EXTRNP _KiSetServerWaitClientEvent,3
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extrn _KeTickCount:DWORD
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extrn _ExpTickCountMultiplier:DWORD
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page ,132
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subttl "NtSetLowWaitHighThread"
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;++
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; Routine Description:
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;
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; This function uses the prereferenced client/server event pair pointer
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; and sets the low event of the event pair and waits on the high event
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; of the event pair object.
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;
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; N.B. This service assumes that it has been called from user mode.
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;
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; Arguments:
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;
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; None.
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;
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; Return Value:
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;
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; TBS
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;
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;--
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cPublicProc _NtSetLowWaitHighThread, 0
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cPublicFpo 0, 0
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mov eax,fs:PcPrcbData+PbCurrentThread
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mov eax,dword ptr [eax+EtEventPair]
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or eax,eax
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jz $BAIL
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mov ecx,eax ; compute address of events
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add eax,EpEventLow ; server event
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add ecx,EpEventHigh ; client event
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stdCall _KiSetServerWaitClientEvent, <eax, ecx, 1>
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xor eax,eax
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stdRET _NtSetLowWaitHighThread
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$BAIL:
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mov eax,STATUS_NO_EVENT_PAIR
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stdRET _NtSetLowWaitHighThread
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stdENDP _NtSetLowWaitHighThread
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page ,132
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subttl "NtSetHighWaitLowThread"
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;++
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; Routine Description:
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;
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; This function uses the prereferenced client/server event pair pointer
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; and sets the low event of the event pair and waits on the high event
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; of the event pair object.
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;
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; N.B. This service assumes that it has been called from user mode.
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;
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; Arguments:
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;
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; None.
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;
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; Return Value:
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;
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; TBS
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;
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;--
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;PUBLIC _NtSetHighWaitLowThread, 0
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cPublicProc _NtSetHighWaitLowThread, 0
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cPublicFpo 0, 0
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mov eax,fs:PcPrcbData+PbCurrentThread
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mov eax,dword ptr [eax+EtEventPair]
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or eax,eax
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jz $BAIL1
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mov ecx,eax ; compute address of events
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add eax,EpEventHigh ; server event
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add ecx,EpEventLow ; client event
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stdCall _KiSetServerWaitClientEvent, <eax, ecx, 1>
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xor eax,eax
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stdRET _NtSetHighWaitLowThread
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$BAIL1:
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mov eax,STATUS_NO_EVENT_PAIR
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stdRET _NtSetHighWaitLowThread
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stdENDP _NtSetHighWaitLowThread
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;++
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;
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; Routine Description:
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;
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; This function returns number of milliseconds since the system
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; booted. This function is designed to support the Win32 GetTicKCount
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; API.
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;
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; Arguments:
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;
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; NONE
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;
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; Return Value:
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;
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; Returns the number of milliseconds that have transpired since boot
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;
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;--
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cPublicProc _NtGetTickCount, 0
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cPublicFpo 0, 0
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mov eax,dword ptr [_KeTickCount]
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mul dword ptr [_ExpTickCountMultiplier]
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shrd eax,edx,24 ; compute resultant tick count
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stdRET _NtGetTickCount
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stdENDP _NtGetTickCount
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_TEXT ends
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end
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