aboutsummaryrefslogtreecommitdiffstats
path: root/threads.c
blob: c8414e181d74f5e160dea89e6f1c54be17f8e0c1 (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
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
/**
 * 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>
#elif defined 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 */

#ifdef HAVE_PTHREAD_H

static int libxml_is_threaded = -1;
#ifdef __GNUC__
#ifdef linux
#if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || (__GNUC__ > 3)
extern int pthread_once (pthread_once_t *__once_control,
                         void (*__init_routine) (void))
	   __attribute((weak));
extern void *pthread_getspecific (pthread_key_t __key)
	   __attribute((weak));
extern int pthread_setspecific (pthread_key_t __key,
                                __const void *__pointer)
	   __attribute((weak));
extern int pthread_key_create (pthread_key_t *__key,
                               void (*__destr_function) (void *))
	   __attribute((weak));
extern int pthread_key_delete (pthread_key_t __key)
	   __attribute((weak));
extern int pthread_mutex_init ()
	   __attribute((weak));
extern int pthread_mutex_destroy ()
	   __attribute((weak));
extern int pthread_mutex_lock ()
	   __attribute((weak));
extern int pthread_mutex_unlock ()
	   __attribute((weak));
extern int pthread_cond_init ()
	   __attribute((weak));
extern int pthread_cond_destroy ()
	   __attribute((weak));
extern int pthread_cond_wait ()
	   __attribute((weak));
extern int pthread_equal ()
	   __attribute((weak));
extern pthread_t pthread_self ()
	   __attribute((weak));
extern int pthread_key_create ()
	   __attribute((weak));
extern int pthread_key_delete ()
	   __attribute((weak));
extern int pthread_cond_signal ()
	   __attribute((weak));
#endif
#endif /* linux */
#endif /* __GNUC__ */
#endif /* HAVE_PTHREAD_H */

/*
 * 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;
static pthread_once_t once_control_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t global_init_lock = PTHREAD_MUTEX_INITIALIZER;
#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 struct {
    DWORD done;
    DWORD control;
} run_once = { 0, 0};
static volatile LPCRITICAL_SECTION global_init_lock = NULL;

/* endif HAVE_WIN32_THREADS */
#elif defined HAVE_BEOS_THREADS
int32 globalkey = 0;
thread_id mainthread = 0;
int32 run_once_init = 0;
static int32 global_init_lock = -1;
static vint32 global_init_count = 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
    if (libxml_is_threaded != 0)
        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
    if (libxml_is_threaded != 0)
        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
    if (libxml_is_threaded != 0)
        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");
#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
    if (libxml_is_threaded != 0)
        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
    if (libxml_is_threaded != 0) {
        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)
{
    if (tok == NULL)
        return;
#ifdef HAVE_PTHREAD_H
    if (libxml_is_threaded != 0) {
        pthread_mutex_destroy(&tok->lock);
        pthread_cond_destroy(&tok->cv);
    }
#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
    if (libxml_is_threaded == 0)
        return;

    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
    if (libxml_is_threaded == 0)
        return;

    pthread_mutex_lock(&tok->lock);
    tok->held--;
    if (tok->held == 0) {
        if (tok->waiters)
            pthread_cond_signal(&tok->cv);
        memset(&tok->tid, 0, sizeof(tok->tid));
    }
    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
}

/**
 * xmlGlobalInitMutexLock
 *
 * Makes sure that the global initialization mutex is initialized and
 * locks it.
 */
void
__xmlGlobalInitMutexLock(void)
{
    /* Make sure the global init lock is initialized and then lock it. */
#ifdef HAVE_PTHREAD_H
    /* The mutex is statically initialized, so we just lock it. */
    if (pthread_mutex_lock != NULL)
        pthread_mutex_lock(&global_init_lock);
#elif defined HAVE_WIN32_THREADS
    LPCRITICAL_SECTION cs;

    /* Create a new critical section */
    if (global_init_lock == NULL) {
        cs = malloc(sizeof(CRITICAL_SECTION));
        if (cs == NULL) {
            xmlGenericError(xmlGenericErrorContext,
                            "xmlGlobalInitMutexLock: out of memory\n");
            return;
        }
        InitializeCriticalSection(cs);

        /* Swap it into the global_init_lock */
#ifdef InterlockedCompareExchangePointer
        InterlockedCompareExchangePointer(&global_init_lock, cs, NULL);
#else /* Use older void* version */
        InterlockedCompareExchange((void **) &global_init_lock,
                                   (void *) cs, NULL);
#endif /* InterlockedCompareExchangePointer */

        /* If another thread successfully recorded its critical
         * section in the global_init_lock then discard the one
         * allocated by this thread. */
        if (global_init_lock != cs) {
            DeleteCriticalSection(cs);
            free(cs);
        }
    }

    /* Lock the chosen critical section */
    EnterCriticalSection(global_init_lock);
#elif defined HAVE_BEOS_THREADS
    int32 sem;

    /* Allocate a new semaphore */
    sem = create_sem(1, "xmlGlobalinitMutex");

    while (global_init_lock == -1) {
        if (atomic_add(&global_init_count, 1) == 0) {
            global_init_lock = sem;
        } else {
            snooze(1);
            atomic_add(&global_init_count, -1);
        }
    }

    /* If another thread successfully recorded its critical
     * section in the global_init_lock then discard the one
     * allocated by this thread. */
    if (global_init_lock != sem)
        delete_sem(sem);

    /* Acquire the chosen semaphore */
    if (acquire_sem(global_init_lock) != B_NO_ERROR) {
#ifdef DEBUG_THREADS
        xmlGenericError(xmlGenericErrorContext,
                        "xmlGlobalInitMutexLock():BeOS:Couldn't acquire semaphore\n");
#endif
    }
#endif
}

void
__xmlGlobalInitMutexUnlock(void)
{
#ifdef HAVE_PTHREAD_H
    if (pthread_mutex_unlock != NULL)
        pthread_mutex_unlock(&global_init_lock);
#elif defined HAVE_WIN32_THREADS
    if (global_init_lock != NULL) {
	LeaveCriticalSection(global_init_lock);
    }
#elif defined HAVE_BEOS_THREADS
    release_sem(global_init_lock);
#endif
}

/**
 * xmlGlobalInitMutexDestroy
 *
 * Makes sure that the global initialization mutex is destroyed before
 * application termination.
 */
void
__xmlGlobalInitMutexDestroy(void)
{
#ifdef HAVE_PTHREAD_H
#elif defined HAVE_WIN32_THREADS
    if (global_init_lock != NULL) {
        DeleteCriticalSection(global_init_lock);
        free(global_init_lock);
        global_init_lock = NULL;
    }
#endif
}

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

#ifdef LIBXML_THREAD_ENABLED
#ifdef xmlLastError
#undef xmlLastError
#endif

/**
 * 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)
{
    xmlGlobalState *gs = (xmlGlobalState *) state;

    /* free any memory allocated in the thread's xmlLastError */
    xmlResetError(&(gs->xmlLastError));
    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) {
	xmlGenericError(xmlGenericErrorContext,
			"xmlGetGlobalState: out of memory\n");
        return (NULL);
    }

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

#ifdef HAVE_PTHREAD_H
#elif defined 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 XMLCDECL
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;

    if (libxml_is_threaded == 0)
        return (NULL);

    pthread_once(&once_control, xmlOnceInit);

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

        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;

    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();

        if (tsd == NULL)
	    return(NULL);
        p = (xmlGlobalStateCleanupHelperParams *)
            malloc(sizeof(xmlGlobalStateCleanupHelperParams));
	if (p == NULL) {
            xmlGenericError(xmlGenericErrorContext,
                            "xmlGetGlobalState: out of memory\n");
            xmlFreeGlobalState(tsd);
	    return(NULL);
	}
        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();
	if (tsd == NULL)
	    return (NULL);

        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
 * Note that this is likely to be broken on some platforms using pthreads
 * as the specification doesn't mandate pthread_t to be an integer type
 *
 * Returns the current thread ID number
 */
int
xmlGetThreadId(void)
{
#ifdef HAVE_PTHREAD_H
    pthread_t id;
    int ret;

    if (libxml_is_threaded == 0)
        return (0);
    id = pthread_self();
    /* horrible but preserves compat, see warning above */
    memcpy(&ret, &id, sizeof(ret));
    return (ret);
#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
    if (libxml_is_threaded == -1)
        xmlInitThreads();
    if (libxml_is_threaded == 0)
        return (1);
    pthread_once(&once_control, xmlOnceInit);
#elif defined HAVE_WIN32_THREADS
    xmlOnceInit();
#elif defined HAVE_BEOS_THREADS
    xmlOnceInit();
#endif

#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlIsMainThread()\n");
#endif
#ifdef HAVE_PTHREAD_H
    return (pthread_equal(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 HAVE_PTHREAD_H
    if (libxml_is_threaded == -1) {
        if ((pthread_once != NULL) &&
            (pthread_getspecific != NULL) &&
            (pthread_setspecific != NULL) &&
            (pthread_key_create != NULL) &&
            (pthread_key_delete != NULL) &&
            (pthread_mutex_init != NULL) &&
            (pthread_mutex_destroy != NULL) &&
            (pthread_mutex_lock != NULL) &&
            (pthread_mutex_unlock != NULL) &&
            (pthread_cond_init != NULL) &&
            (pthread_cond_destroy != NULL) &&
            (pthread_cond_wait != NULL) &&
            (pthread_equal != NULL) &&
            (pthread_self != NULL) &&
            (pthread_cond_signal != NULL)) {
            libxml_is_threaded = 1;

/* fprintf(stderr, "Running multithreaded\n"); */
        } else {

/* fprintf(stderr, "Running without multithread\n"); */
            libxml_is_threaded = 0;
        }
    }
#elif 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.
 *
 * WARNING: if your application is multithreaded or has plugin support
 *          calling this may crash the application if another thread or
 *          a plugin is still using libxml2. It's sometimes very hard to
 *          guess if libxml2 is in use in the application, some libraries
 *          or plugins may use it without notice. In case of doubt abstain
 *          from calling this function or do it just before calling exit()
 *          to avoid leak reports from valgrind !
 */
void
xmlCleanupThreads(void)
{
#ifdef DEBUG_THREADS
    xmlGenericError(xmlGenericErrorContext, "xmlCleanupThreads()\n");
#endif
#ifdef HAVE_PTHREAD_H
    if ((libxml_is_threaded)  && (pthread_key_delete != NULL))
        pthread_key_delete(globalkey);
    once_control = once_control_init;
#elif 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();
#elif defined(HAVE_WIN32_THREADS)
    if (!run_once.done) {
        if (InterlockedIncrement(&run_once.control) == 1) {
#if !defined(HAVE_COMPILER_TLS)
            globalkey = TlsAlloc();
#endif
            mainthread = GetCurrentThreadId();
            run_once.done = 1;
        } else {
            /* Another thread is working; give up our slice and
             * wait until they're done. */
            while (!run_once.done)
                Sleep(0);
        }
    }
#elif defined 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
 */
#ifdef HAVE_PTHREAD_H
#elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
#if defined(LIBXML_STATIC_FOR_DLL)
BOOL XMLCALL
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
#define bottom_threads
#include "elfgcchack.h"