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// TITLE("Fast Event Pair Support")//++//// Copyright (c) 1992 Microsoft Corporation// Copyright (c) 1992 Digital Equipment Corporation//// Module Name://// evpair.s//// Abstract://// This module contains the implementation for the fast event pair// system services that are used for client/server synchronization.//// Author://// David N. Cutler (davec) 1-Feb-1992//// Environment://// Kernel mode.//// Revision History://// Thomas Van Baak (tvb) 20-May-1992//// Adapted for Alpha AXP.////--
#include "ksalpha.h"
SBTTL("Set Low Wait High Thread")//++//// NTSTATUS// NtSetLowWaitHighThread (// )//// Routine Description://// This function uses the prereferenced client/server event pair pointer// and sets the low event of the event pair and waits on the high event// of the event pair object.//// N.B. This is a very heavily used service.//// Arguments://// None.//// Return Value://// STATUS_NO_EVENT_PAIR is returned if no event pair is associated with// the current thread. Otherwise, the status of the wait operation is// returned as the function value.//////--
LEAF_ENTRY(NtSetLowWaitHighThread)
GET_CURRENT_THREAD // v0 = current thread
ldl a0, EtEventPair(v0) // get address of event pair object beq a0, 10f // if eq, no event pair associated addl a0, EpEventHigh, a1 // compute client event address addl a0, EpEventLow, a0 // comput server event address ldil a2, 1 // set user mode value br zero, KiSetServerWaitClientEvent // finish in wait code
10: ldil v0, STATUS_NO_EVENT_PAIR // set error status return value ret zero, (ra) // return
.end NtSetLowWaitHighThread SBTTL("Set High Wait Low Thread")//++//// NTSTATUS// NtSetHighWaitLowThread (// )//// Routine Description://// This function uses the prereferenced client/server event pair pointer// and sets the High event of the event pair and waits on the low event// of the event pair object.//// N.B. This is a very heavily used service.//// Arguments://// None.//// Return Value://// STATUS_NO_EVENT_PAIR is returned if no event pair is associated with// the current thread. Otherwise, the status of the wait operation is// returned as the function value.//////--
LEAF_ENTRY(NtSetHighWaitLowThread)
GET_CURRENT_THREAD // v0 = current thread
ldl a0, EtEventPair(v0) // get address of event pair object beq a0, 10f // if eq, no event pair associated addl a0, EpEventLow, a1 // compute client event address addl a0, EpEventHigh, a0 // compute server event address ldil a2, 1 // set user mode value br zero, KiSetServerWaitClientEvent // finish in wait code
10: ldil v0, STATUS_NO_EVENT_PAIR // set error status return value ret zero, (ra) // return
.end NtSetHighWaitLowThread
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