Jeff Hill
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/*************************************************************************\
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* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
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* National Laboratory.
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* Copyright (c) 2002 The Regents of the University of California, as
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* Operator of Los Alamos National Laboratory.
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* EPICS BASE Versions 3.13.7
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* and higher are distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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/*
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* $Id$
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*
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* L O S A L A M O S
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* Los Alamos National Laboratory
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* Los Alamos, New Mexico 87545
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*
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* Copyright, 1986, The Regents of the University of California.
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*
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* Author: Jeff Hill
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*/
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#define epicsAssertAuthor "Jeff Hill johill@lanl.gov"
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#include "cac.h"
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callbackMutex::callbackMutex ( bool threadsMayBeBlockingForRecvThreadsToFinishIn ) :
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recvThreadsPendingCount ( 0u ),
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threadsMayBeBlockingForRecvThreadsToFinish ( threadsMayBeBlockingForRecvThreadsToFinishIn )
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{
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}
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callbackMutex::~callbackMutex ()
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{
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}
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void callbackMutex::lock ()
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{
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if ( this->threadsMayBeBlockingForRecvThreadsToFinish ) {
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if ( ! this->primaryMutex.tryLock () ) {
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// the count must be incremented prior to blocking for the lock
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{
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epicsGuard < epicsMutex > autoMutex ( this->countMutex );
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assert ( this->recvThreadsPendingCount < UINT_MAX );
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this->recvThreadsPendingCount++;
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}
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this->primaryMutex.lock ();
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bool signalRequired;
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{
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epicsGuard < epicsMutex > autoMutex ( this->countMutex );
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assert ( this->recvThreadsPendingCount > 0 );
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this->recvThreadsPendingCount--;
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if ( this->recvThreadsPendingCount == 0u ) {
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signalRequired = true;
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}
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else {
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signalRequired = false;
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}
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}
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if ( signalRequired ) {
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this->noRecvThreadsPending.signal ();
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}
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}
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}
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else {
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this->primaryMutex.lock ();
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}
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}
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void callbackMutex::unlock ()
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{
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this->primaryMutex.unlock ();
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}
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void callbackMutex::waitUntilNoRecvThreadsPending ()
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{
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epicsGuard < epicsMutex > autoMutex ( this->countMutex );
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while ( this->recvThreadsPendingCount > 0 ) {
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epicsGuardRelease < epicsMutex > autoMutexRelease ( autoMutex );
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this->noRecvThreadsPending.wait ();
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}
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}
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