summaryrefslogtreecommitdiff
path: root/threads.c
blob: ac6c8d62ff743b8569b1446bc886bc0b249febe0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
/**
 * threads.c: set of generic threading related routines 
 *
 * See Copyright for the status of this software.
 *
 * Gary Pennington <Gary.Pennington@uk.sun.com>
 * daniel@veillard.com
 */

#define IN_LIBXML
#include "libxml.h"

#include <string.h>

#include <libxml/threads.h>
#include <libxml/globals.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif

#ifdef HAVE_WIN32_THREADS
#include <windows.h>
#ifndef HAVE_COMPILER_TLS
#include <process.h>
#endif
#endif

#ifdef HAVE_BEOS_THREADS
#include <OS.h>
#include <TLS.h>
#endif

#if defined(SOLARIS)
#include <note.h>
#endif

/* #define DEBUG_THREADS */

/*
 * TODO: this module still uses malloc/free and not xmlMalloc/xmlFree
 *       to avoid some crazyness since xmlMalloc/xmlFree may actually
 *       be hosted on allocated blocks needing them for the allocation ...
 */

/*
 * xmlMutex are a simple mutual exception locks
 */
struct _xmlMutex {
#ifdef HAVE_PTHREAD_H
    pthread_mutex_t lock;
#elif defined HAVE_WIN32_THREADS
    HANDLE mutex;
#elif defined HAVE_BEOS_THREADS
	sem_id sem;
	thread_id tid;
#else
    int empty;
#endif
};

/*
 * xmlRMutex are reentrant mutual exception locks
 */
struct _xmlRMutex {
#ifdef HAVE_PTHREAD_H
    pthread_mutex_t lock;
    unsigned int    held;
    unsigned int    waiters;
    pthread_t       tid;
    pthread_cond_t  cv;
#elif defined HAVE_WIN32_THREADS
    CRITICAL_SECTION cs;
    unsigned int count;
#elif defined HAVE_BEOS_THREADS
	xmlMutexPtr lock;
	thread_id tid;
	int32 count;
#else
    int empty;
#endif
};
/*
 * This module still has some internal static data.
 *   - xmlLibraryLock a global lock
 *   - globalkey used for per-thread data
 */

#ifdef HAVE_PTHREAD_H
static pthread_key_t	globalkey;
static pthread_t	mainthread;
static pthread_once_t once_control = PTHREAD_ONCE_INIT;
#elif defined HAVE_WIN32_THREADS
#if defined(HAVE_COMPILER_TLS)
static __declspec(thread) xmlGlobalState tlstate;
static __declspec(thread) int tlstate_inited = 0;
#else /* HAVE_COMPILER_TLS */
static DWORD globalkey = TLS_OUT_OF_INDEXES;
#endif /* HAVE_COMPILER_TLS */
static DWORD mainthread;
static int run_once_init = 1;
/* endif HAVE_WIN32_THREADS */
#elif defined HAVE_BEOS_THREADS
int32 globalkey = 0;
thread_id mainthread = 0;
int32 run_once_init = 0;
#endif

static xmlRMutexPtr	xmlLibraryLock = NULL;
#ifdef LIBXML_THREAD_ENABLED
static void xmlOnceInit(void);
#endif

/**
 * xmlNewMutex:
 *
 * xmlNewMutex() is used to allocate a libxml2 token struct for use in
 * synchronizing access to data.
 *
 * Returns a new simple mutex pointer or NULL in case of error
 */
xmlMutexPtr
xmlNewMutex(void)
{
    xmlMutexPtr tok;

    if ((tok = malloc(sizeof(xmlMutex))) == NULL)
        return (NULL);
#ifdef HAVE_PTHREAD_H
    pthread_mutex_init(&tok->lock, NULL);
#elif defined HAVE_WIN32_THREADS
    tok->mutex = CreateMutex(NULL, FALSE, NULL);
#elif defined HAVE_BEOS_THREADS
	if ((tok->sem = create_sem(1, "xmlMutex")) < B_OK) {
		free(tok);
		return NULL;
	}
	tok->tid = -1;
#endif
    return (tok);
}

/**
 * xmlFreeMutex:
 * @tok:  the simple mutex
 *
 * xmlFreeMutex() is used to reclaim resources associated with a libxml2 token
 * struct.
 */
void
xmlFreeMutex(xmlMutexPtr tok)
{
    if (tok == NULL) return;

#ifdef HAVE_PTHREAD_H
    pthread_mutex_destroy(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    CloseHandle(tok->mutex);
#elif defined HAVE_BEOS_THREADS
	delete_sem(tok->sem);
#endif
    free(tok);
}

/**
 * xmlMutexLock:
 * @tok:  the simple mutex
 *
 * xmlMutexLock() is used to lock a libxml2 token.
 */
void
xmlMutexLock(xmlMutexPtr tok)
{
    if (tok == NULL)
        return;
#ifdef HAVE_PTHREAD_H
    pthread_mutex_lock(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    WaitForSingleObject(tok->mutex, INFINITE);
#elif defined HAVE_BEOS_THREADS
	if (acquire_sem(tok->sem) != B_NO_ERROR) {
#ifdef DEBUG_THREADS
		xmlGenericError(xmlGenericErrorContext, "xmlMutexLock():BeOS:Couldn't aquire semaphore\n");
		exit();
#endif
	}
	tok->tid = find_thread(NULL);
#endif

}

/**
 * xmlMutexUnlock:
 * @tok:  the simple mutex
 *
 * xmlMutexUnlock() is used to unlock a libxml2 token.
 */
void
xmlMutexUnlock(xmlMutexPtr tok)
{
    if (tok == NULL)
        return;
#ifdef HAVE_PTHREAD_H
    pthread_mutex_unlock(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    ReleaseMutex(tok->mutex);
#elif defined HAVE_BEOS_THREADS
	if (tok->tid == find_thread(NULL)) {
		tok->tid = -1;
		release_sem(tok->sem);
	}
#endif
}

/**
 * xmlNewRMutex:
 *
 * xmlRNewMutex() is used to allocate a reentrant mutex for use in
 * synchronizing access to data. token_r is a re-entrant lock and thus useful
 * for synchronizing access to data structures that may be manipulated in a
 * recursive fashion.
 *
 * Returns the new reentrant mutex pointer or NULL in case of error
 */
xmlRMutexPtr
xmlNewRMutex(void)
{
    xmlRMutexPtr tok;

    if ((tok = malloc(sizeof(xmlRMutex))) == NULL)
        return (NULL);
#ifdef HAVE_PTHREAD_H
    pthread_mutex_init(&tok->lock, NULL);
    tok->held = 0;
    tok->waiters = 0;
    pthread_cond_init(&tok->cv, NULL);
#elif defined HAVE_WIN32_THREADS
    InitializeCriticalSection(&tok->cs);
    tok->count = 0;
#elif defined HAVE_BEOS_THREADS
	if ((tok->lock = xmlNewMutex()) == NULL) {
		free(tok);
		return NULL;
	}
	tok->count = 0;
#endif
    return (tok);
}

/**
 * xmlFreeRMutex:
 * @tok:  the reentrant mutex
 *
 * xmlRFreeMutex() is used to reclaim resources associated with a
 * reentrant mutex.
 */
void
xmlFreeRMutex(xmlRMutexPtr tok ATTRIBUTE_UNUSED)
{
#ifdef HAVE_PTHREAD_H
    pthread_mutex_destroy(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    DeleteCriticalSection(&tok->cs);
#elif defined HAVE_BEOS_THREADS
	xmlFreeMutex(tok->lock);
#endif
    free(tok);
}

/**
 * xmlRMutexLock:
 * @tok:  the reentrant mutex
 *
 * xmlRMutexLock() is used to lock a libxml2 token_r.
 */
void
xmlRMutexLock(xmlRMutexPtr tok)
{
    if (tok == NULL)
        return;
#ifdef HAVE_PTHREAD_H
    pthread_mutex_lock(&tok->lock);
    if (tok->held) {
        if (pthread_equal(tok->tid, pthread_self())) {
            tok->held++;
            pthread_mutex_unlock(&tok->lock);
            return;
        } else {
            tok->waiters++;
            while (tok->held)
                pthread_cond_wait(&tok->cv, &tok->lock);
            tok->waiters--;
        }
    }
    tok->tid = pthread_self();
    tok->held = 1;
    pthread_mutex_unlock(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    EnterCriticalSection(&tok->cs);
    ++tok->count;
#elif defined HAVE_BEOS_THREADS
	if (tok->lock->tid == find_thread(NULL)) {
		tok->count++;
		return;
	} else {
		xmlMutexLock(tok->lock);
		tok->count = 1;
	}
#endif
}

/**
 * xmlRMutexUnlock:
 * @tok:  the reentrant mutex
 *
 * xmlRMutexUnlock() is used to unlock a libxml2 token_r.
 */
void
xmlRMutexUnlock(xmlRMutexPtr tok ATTRIBUTE_UNUSED)
{
    if (tok == NULL)
        return;
#ifdef HAVE_PTHREAD_H
    pthread_mutex_lock(&tok->lock);
    tok->held--;
    if (tok->held == 0) {
        if (tok->waiters)
            pthread_cond_signal(&tok->cv);
        tok->tid = 0;
    }
    pthread_mutex_unlock(&tok->lock);
#elif defined HAVE_WIN32_THREADS
    if (!--tok->count) 
	LeaveCriticalSection(&tok->cs);
#elif defined HAVE_BEOS_THREADS
	if (tok->lock->tid == find_thread(NULL)) {
		tok->count--;
		if (tok->count == 0) {
			xmlMutexUnlock(tok->lock);
		}
		return;
	}
#endif
}

/************************************************************************
 *									*
 *			Per thread global state handling		*
 *									*
 ************************************************************************/

#ifdef LIBXML_THREAD_ENABLED
/**
 * xmlFreeGlobalState:
 * @state:  a thread global state
 *
 * xmlFreeGlobalState() is called when a thread terminates with a non-NULL
 * global state. It is is used here to reclaim memory resources.
 */
static void
xmlFreeGlobalState(void *state)
{
    free(state);
}

/**
 * xmlNewGlobalState:
 *
 * xmlNewGlobalState() allocates a global state. This structure is used to
 * hold all data for use by a thread when supporting backwards compatibility
 * of libxml2 to pre-thread-safe behaviour.
 *
 * Returns the newly allocated xmlGlobalStatePtr or NULL in case of error
 */
static xmlGlobalStatePtr
xmlNewGlobalState(void)
{
    xmlGlobalState *gs;
    
    gs = malloc(sizeof(xmlGlobalState));
    if (gs == NULL)
	return(NULL);

    memset(gs, 0, sizeof(xmlGlobalState));
    xmlInitializeGlobalState(gs);
    return (gs);
}
#endif /* LIBXML_THREAD_ENABLED */


#ifdef HAVE_WIN32_THREADS
#if !defined(HAVE_COMPILER_TLS)
#if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL)
typedef struct _xmlGlobalStateCleanupHelperParams
{
    HANDLE thread;
    void *memory;
} xmlGlobalStateCleanupHelperParams;

static void xmlGlobalStateCleanupHelper (void *p)
{
    xmlGlobalStateCleanupHelperParams *params = (xmlGlobalStateCleanupHelperParams *) p;
    WaitForSingleObject(params->thread, INFINITE);
    CloseHandle(params->thread);
    xmlFreeGlobalState(params->memory);
    free(params);
    _endthread();
}
#else /* LIBXML_STATIC && !LIBXML_STATIC_FOR_DLL */

typedef struct _xmlGlobalStateCleanupHelperParams
{
    void *memory;
    struct _xmlGlobalStateCleanupHelperParams * prev;
    struct _xmlGlobalStateCleanupHelperParams * next;
} xmlGlobalStateCleanupHelperParams;

static xmlGlobalStateCleanupHelperParams * cleanup_helpers_head = NULL;
static CRITICAL_SECTION cleanup_helpers_cs;

#endif /* LIBXMLSTATIC && !LIBXML_STATIC_FOR_DLL */
#endif /* HAVE_COMPILER_TLS */
#endif /* HAVE_WIN32_THREADS */

#if defined HAVE_BEOS_THREADS
/**
 * xmlGlobalStateCleanup:
 * @data: unused parameter
 *
 * Used for Beos only
 */
void xmlGlobalStateCleanup(void *data)
{
	void *globalval = tls_get(globalkey);
	if (globalval != NULL)
		xmlFreeGlobalState(globalval);
}
#endif

/**
 * xmlGetGlobalState:
 *
 * xmlGetGlobalState() is called to retrieve the global state for a thread.
 *
 * Returns the thread global state or NULL in case of error
 */
xmlGlobalStatePtr
xmlGetGlobalState(void)
{
#ifdef HAVE_PTHREAD_H
    xmlGlobalState *globalval;

    pthread_once(&once_control, xmlOnceInit);

    if ((globalval = (xmlGlobalState *)
		pthread_getspecific(globalkey)) == NULL) {
        xmlGlobalState *tsd = xmlNewGlobalState();

        pthread_setspecific(globalkey, tsd);
        return (tsd);
    }
    return (globalval);
#elif defined HAVE_WIN32_THREADS
#if defined(HAVE_COMPILER_TLS)
    if (!tlstate_inited) {
	tlstate_inited = 1;
	xmlInitializeGlobalState(&tlstate);
    }
    return &tlstate;
#else /* HAVE_COMPILER_TLS */
    xmlGlobalState *globalval;
    xmlGlobalStateCleanupHelperParams * p;

    if (run_once_init) { 
	run_once_init = 0; 
	xmlOnceInit(); 
    }
#if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL)
    globalval = (xmlGlobalState *)TlsGetValue(globalkey);
#else
    p = (xmlGlobalStateCleanupHelperParams*)TlsGetValue(globalkey);
    globalval = (xmlGlobalState *)(p ? p->memory : NULL);
#endif
    if (globalval == NULL) {
	xmlGlobalState *tsd = xmlNewGlobalState();
	p = (xmlGlobalStateCleanupHelperParams *) malloc(sizeof(xmlGlobalStateCleanupHelperParams));
	p->memory = tsd;
#if defined(LIBXML_STATIC) && !defined(LIBXML_STATIC_FOR_DLL)
	DuplicateHandle(GetCurrentProcess(), GetCurrentThread(), 
		GetCurrentProcess(), &p->thread, 0, TRUE, DUPLICATE_SAME_ACCESS);
	TlsSetValue(globalkey, tsd);
	_beginthread(xmlGlobalStateCleanupHelper, 0, p);
#else
	EnterCriticalSection(&cleanup_helpers_cs);	
        if (cleanup_helpers_head != NULL) {
            cleanup_helpers_head->prev = p;
        }
	p->next = cleanup_helpers_head;
	p->prev = NULL;
	cleanup_helpers_head = p;
	TlsSetValue(globalkey, p);
	LeaveCriticalSection(&cleanup_helpers_cs);	
#endif

	return (tsd);
    }
    return (globalval);
#endif /* HAVE_COMPILER_TLS */
#elif defined HAVE_BEOS_THREADS
    xmlGlobalState *globalval;

    xmlOnceInit();

    if ((globalval = (xmlGlobalState *)
		tls_get(globalkey)) == NULL) {
        xmlGlobalState *tsd = xmlNewGlobalState();

        tls_set(globalkey, tsd);
        on_exit_thread(xmlGlobalStateCleanup, NULL);
        return (tsd);
    }
    return (globalval);
#else
    return(NULL);
#endif
}

/************************************************************************
 *									*
 *			Library wide thread interfaces			*
 *									*
 ************************************************************************/

/**
 * xmlGetThreadId:
 *
 * xmlGetThreadId() find the current thread ID number
 *
 * Returns the current thread ID number
 */
int
xmlGetThreadId(void)
{
#ifdef HAVE_PTHREAD_H
    return((int) pthread_self());
#elif defined HAVE_WIN32_THREADS
    return GetCurrentThreadId();
#elif defined HAVE_BEOS_THREADS
	return find_thread(NULL);
#else
    return((int) 0);
#endif
}

/**
 * xmlIsMainThread:
 *
 * xmlIsMainThread() check whether the current thread is the main thread.
 *
 * Returns 1 if the current thread is the main thread, 0 otherwise
 */
int
xmlIsMainThread(void)
{
#ifdef HAVE_PTHREAD_H
    pthread_once(&once_control, xmlOnceInit);
#elif defined HAVE_WIN32_THREADS
    if (run_once_init) { 
	run_once_init = 0; 
	xmlOnceInit (); 
    }
#elif defined HAVE_BEOS_THREADS
	xmlOnceInit();
#endif
        
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlIsMainThread()\n");
#endif
#ifdef HAVE_PTHREAD_H
    return(mainthread == pthread_self());
#elif defined HAVE_WIN32_THREADS
    return(mainthread == GetCurrentThreadId ());
#elif defined HAVE_BEOS_THREADS
	return(mainthread == find_thread(NULL));
#else
    return(1);
#endif
}

/**
 * xmlLockLibrary:
 *
 * xmlLockLibrary() is used to take out a re-entrant lock on the libxml2
 * library.
 */
void
xmlLockLibrary(void)
{
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlLockLibrary()\n");
#endif
    xmlRMutexLock(xmlLibraryLock);
}

/**
 * xmlUnlockLibrary:
 *
 * xmlUnlockLibrary() is used to release a re-entrant lock on the libxml2
 * library.
 */
void
xmlUnlockLibrary(void)
{
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlUnlockLibrary()\n");
#endif
    xmlRMutexUnlock(xmlLibraryLock);
}

/**
 * xmlInitThreads:
 *
 * xmlInitThreads() is used to to initialize all the thread related
 * data of the libxml2 library.
 */
void
xmlInitThreads(void)
{
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlInitThreads()\n");
#endif
#if defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
    InitializeCriticalSection(&cleanup_helpers_cs);
#endif
}

/**
 * xmlCleanupThreads:
 *
 * xmlCleanupThreads() is used to to cleanup all the thread related
 * data of the libxml2 library once processing has ended.
 */
void
xmlCleanupThreads(void)
{
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlCleanupThreads()\n");
#endif
#if defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
    if (globalkey != TLS_OUT_OF_INDEXES) {
	xmlGlobalStateCleanupHelperParams * p;
	EnterCriticalSection(&cleanup_helpers_cs);
	p = cleanup_helpers_head;
	while (p != NULL) {
		xmlGlobalStateCleanupHelperParams * temp = p;
		p = p->next;
		xmlFreeGlobalState(temp->memory);
		free(temp);
	}
	cleanup_helpers_head = 0;
	LeaveCriticalSection(&cleanup_helpers_cs);
	TlsFree(globalkey);
	globalkey = TLS_OUT_OF_INDEXES;
    }
    DeleteCriticalSection(&cleanup_helpers_cs);
#endif
}

#ifdef LIBXML_THREAD_ENABLED
/**
 * xmlOnceInit
 *
 * xmlOnceInit() is used to initialize the value of mainthread for use
 * in other routines. This function should only be called using
 * pthread_once() in association with the once_control variable to ensure
 * that the function is only called once. See man pthread_once for more
 * details.
 */
static void
xmlOnceInit(void) {
#ifdef HAVE_PTHREAD_H
    (void) pthread_key_create(&globalkey, xmlFreeGlobalState);
    mainthread = pthread_self();
#endif

#if defined(HAVE_WIN32_THREADS)
#if !defined(HAVE_COMPILER_TLS)
    globalkey = TlsAlloc();
#endif
    mainthread = GetCurrentThreadId();
#endif

#ifdef HAVE_BEOS_THREADS
	if (atomic_add(&run_once_init, 1) == 0) {
		globalkey = tls_allocate();
		tls_set(globalkey, NULL);
		mainthread = find_thread(NULL);
	} else
		atomic_add(&run_once_init, -1);
#endif
}
#endif

/**
 * DllMain:
 * @hinstDLL: handle to DLL instance
 * @fdwReason: Reason code for entry
 * @lpvReserved: generic pointer (depends upon reason code)
 *
 * Entry point for Windows library. It is being used to free thread-specific
 * storage.
 *
 * Returns TRUE always
 */
#if defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
#if defined(LIBXML_STATIC_FOR_DLL)
BOOL WINAPI xmlDllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) 
#else
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) 
#endif
{
    switch(fdwReason) {
    case DLL_THREAD_DETACH:
	if (globalkey != TLS_OUT_OF_INDEXES) {
	    xmlGlobalState *globalval = NULL;
	    xmlGlobalStateCleanupHelperParams * p =
		(xmlGlobalStateCleanupHelperParams*)TlsGetValue(globalkey);
	    globalval = (xmlGlobalState *)(p ? p->memory : NULL);
            if (globalval) {
                xmlFreeGlobalState(globalval);
                TlsSetValue(globalkey,NULL);
            }
	    if (p)
	    {
		EnterCriticalSection(&cleanup_helpers_cs);
                if (p == cleanup_helpers_head)
		    cleanup_helpers_head = p->next;
                else
		    p->prev->next = p->next;
                if (p->next != NULL)
                    p->next->prev = p->prev;
		LeaveCriticalSection(&cleanup_helpers_cs);
		free(p);
	    }
	}
	break;
    }
    return TRUE;
}
#endif