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Overview
Comment:Fix bug 1700, deadlock in notifier with threads enabled on Unix.
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Timelines: family | ancestors | descendants | both | core-8-1-branch-old
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SHA1: 067a0da5bbed6f31f092320d527bb66a0fd53134
User & Date: redman 1999-04-09 23:29:58
Context
1999-04-13
00:01
Doc bug fixes: Docs about APIs that dont exist were removed. Added example to catch ... check-in: d0a02d55eb user: surles tags: core-8-1-branch-old
1999-04-09
23:29
Fix bug 1700, deadlock in notifier with threads enabled on Unix. check-in: 067a0da5bb user: redman tags: core-8-1-branch-old
21:01
fix doc bugs 1739 & 1486 check-in: abf22092e0 user: surles tags: core-8-1-branch-old
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Changes to ChangeLog. 









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1999-04-06    <[email protected]>

	* tests/unixNotfy.test: Fixed hang in tests when built with thread
	support. 

	* tests/httpold.test: Fixed broken test that didn't wait long
	enough for events to arrive.

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1999-04-09    <[email protected]>

	* unix/tclUnixNotfy.c: Fixed notifier deadlock situation when the
	pipe used to talk back notifier thread is filled with data.  When
	calling the write() function to feed data down that pipe, unlock
	the notifierMutex to allow the notifier to wake up again.  Found
	as a result of the focus.test for Tk hanging. [Bug: 1700]

1999-04-06    <[email protected]>

	* tests/unixNotfy.test: Fixed hang in tests when built with thread
	support. 

	* tests/httpold.test: Fixed broken test that didn't wait long
	enough for events to arrive.

Changes to unix/tclUnixNotfy.c. 

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 *	../generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUnixNotfy.c,v 1.1.2.9 1999/03/24 04:25:17 stanton Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include <signal.h> 

/*
................................................................................

    if (waitForFiles) {
        /*
         * Add the ThreadSpecificData structure of this thread to the list
         * of ThreadSpecificData structures of all threads that are waiting
         * on file events.
         */


        tsdPtr->nextPtr = waitingListPtr;
        if (waitingListPtr) {
            waitingListPtr->prevPtr = tsdPtr;
        }
        tsdPtr->prevPtr = 0;
        waitingListPtr = tsdPtr;
	tsdPtr->onList = 1;


	write(triggerPipe, "", 1);

    }

    memset((VOID *) tsdPtr->readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));

    if (!tsdPtr->eventReady) {

        Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, timePtr);
    }
    tsdPtr->eventReady = 0;

    if (waitForFiles && tsdPtr->onList) {
	/*
	 * Remove the ThreadSpecificData structure of this thread from the
................................................................................
            waitingListPtr = tsdPtr->nextPtr;
        }
        if (tsdPtr->nextPtr) {
            tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
        }
        tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	tsdPtr->onList = 0;

	write(triggerPipe, "", 1);


    }

    
#else
    memcpy((VOID *) tsdPtr->readyMasks, (VOID *) tsdPtr->checkMasks,
	    3*MASK_SIZE*sizeof(fd_mask));
    numFound = select(tsdPtr->numFdBits,







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 *	../generic/tclNotify.c.
 *
 * Copyright (c) 1995-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUnixNotfy.c,v 1.1.2.10 1999/04/09 23:30:01 redman Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include <signal.h> 

/*
................................................................................

    if (waitForFiles) {
        /*
         * Add the ThreadSpecificData structure of this thread to the list
         * of ThreadSpecificData structures of all threads that are waiting
         * on file events.
         */


        tsdPtr->nextPtr = waitingListPtr;
        if (waitingListPtr) {
            waitingListPtr->prevPtr = tsdPtr;
        }
        tsdPtr->prevPtr = 0;
        waitingListPtr = tsdPtr;
	tsdPtr->onList = 1;
	
	Tcl_MutexUnlock(&notifierMutex);
	write(triggerPipe, "", 1);
	Tcl_MutexLock(&notifierMutex);
    }

    memset((VOID *) tsdPtr->readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask));

    if (!tsdPtr->eventReady) {

        Tcl_ConditionWait(&tsdPtr->waitCV, &notifierMutex, timePtr);
    }
    tsdPtr->eventReady = 0;

    if (waitForFiles && tsdPtr->onList) {
	/*
	 * Remove the ThreadSpecificData structure of this thread from the
................................................................................
            waitingListPtr = tsdPtr->nextPtr;
        }
        if (tsdPtr->nextPtr) {
            tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
        }
        tsdPtr->nextPtr = tsdPtr->prevPtr = NULL;
	tsdPtr->onList = 0;
        Tcl_MutexUnlock(&notifierMutex);
	write(triggerPipe, "", 1);
        Tcl_MutexLock(&notifierMutex);

    }

    
#else
    memcpy((VOID *) tsdPtr->readyMasks, (VOID *) tsdPtr->checkMasks,
	    3*MASK_SIZE*sizeof(fd_mask));
    numFound = select(tsdPtr->numFdBits,

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