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/*
* The contents of this file are subject to the AOLserver Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://aolserver.com/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is AOLserver Code and related documentation
* distributed by AOL.
*
* The Initial Developer of the Original Code is America Online,
* Inc. Portions created by AOL are Copyright (C) 1999 America Online,
* Inc. All Rights Reserved.
*
* Alternatively, the contents of this file may be used under the terms
* of the GNU General Public License (the "GPL"), in which case the
* provisions of GPL are applicable instead of those above. If you wish
* to allow use of your version of this file only under the terms of the
* GPL and not to allow others to use your version of this file under the
* License, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the GPL.
* If you do not delete the provisions above, a recipient may use your
* version of this file under either the License or the GPL.
*/
/*
* tls.c --
*
* Thread local storage support for nsthreads. Note that the nsthread
* library handles thread local storage directly.
*/
static const char *RCSID = "@(#) $Header: /cvsroot/aolserver/aolserver/thread/tls.c,v 1.4 2000/11/09 00:33:54 jgdavidson Exp $, compiled: " __DATE__ " " __TIME__;
#include "thread.h"
/*
* The following global variable specifies the maximum TLS id. Modifying
* this value has no effect.
*/
int nsThreadMaxTls = NS_THREAD_MAXTLS;
/*
* Static functions defined in this file.
*/
static Ns_TlsCleanup *cleanupProcs[NS_THREAD_MAXTLS];
#define GETKEY(tlsPtr) ((int) *(tlsPtr))
#define GETSLOT(tlsPtr, slotPtr) \
if (GETKEY(tlsPtr) < 1 || GETKEY(tlsPtr) >= NS_THREAD_MAXTLS) \
NsThreadAbort("Ns_Tls: invalid key: %d: should be between 1 and %d",\
GETKEY(tlsPtr), NS_THREAD_MAXTLS);\
(slotPtr) = &((NsGetThread())->tlsPtr[GETKEY(tlsPtr)]);
/*
*----------------------------------------------------------------------
*
* Ns_TlsAlloc --
*
* Allocate the next tls id.
*
* Results:
* None.
*
* Side effects:
* Id is set in given tlsPtr.
*
*----------------------------------------------------------------------
*/
void
Ns_TlsAlloc(Ns_Tls *tlsPtr, Ns_TlsCleanup *cleanup)
{
static int nextId = 1;
int id;
Ns_MasterLock();
if (nextId == NS_THREAD_MAXTLS) {
NsThreadAbort("Ns_TlsAlloc: exceded max tls: %d", NS_THREAD_MAXTLS);
}
id = nextId++;
cleanupProcs[id] = cleanup;
Ns_MasterUnlock();
*tlsPtr = (void *) id;
}
/*
*----------------------------------------------------------------------
*
* Ns_TlsSet --
*
* Set the value for a threads tls slot.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Ns_TlsSet(Ns_Tls *tlsPtr, void *value)
{
register void **slotPtr;
GETSLOT(tlsPtr, slotPtr);
*slotPtr = value;
}
/*
*----------------------------------------------------------------------
*
* Ns_TlsGet --
*
* Get this thread's value in a tls slot.
*
* Results:
* None.
*
* Side effects:
* valuePtr is updated with value in this thread's slot.
*
*----------------------------------------------------------------------
*/
void *
Ns_TlsGet(Ns_Tls *tlsPtr)
{
register void **slotPtr;
GETSLOT(tlsPtr, slotPtr);
return *slotPtr;
}
/*
*----------------------------------------------------------------------
*
* NsCleanupTls --
*
* Cleanup thread local storage in LIFO order for an exiting thread.
* Note the careful use of the counters to keep iterating over the
* list, up to 5 times, until all TLS values are NULL. This emulates
* the Pthread TLS behavior which catches a destructor inadvertantly
* calling a library which resets a TLS value after it's been destroyed.
*
* Results:
* None.
*
* Side effects:
* Cleanup procs are invoked for non-null values.
*
*----------------------------------------------------------------------
*/
void
NsCleanupTls(Thread *thrPtr)
{
int i, trys, retry;
void *arg;
trys = 0;
do {
retry = 0;
i = NS_THREAD_MAXTLS;
while (i-- > 0) {
if (cleanupProcs[i] != NULL && thrPtr->tlsPtr[i] != NULL) {
arg = thrPtr->tlsPtr[i];
thrPtr->tlsPtr[i] = NULL;
(*cleanupProcs[i])(arg);
retry = 1;
}
}
} while (retry && trys++ < 5);
}
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