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207 lines
6.6 KiB
207 lines
6.6 KiB
#ifndef _WIN32THREAD_H
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#define _WIN32THREAD_H
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#include "win32.h"
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typedef struct win32_cond { LONG waiters; HANDLE sem; } perl_cond;
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typedef DWORD perl_key;
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typedef HANDLE perl_os_thread;
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#ifndef DONT_USE_CRITICAL_SECTION
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/* Critical Sections used instead of mutexes: lightweight,
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* but can't be communicated to child processes, and can't get
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* HANDLE to it for use elsewhere.
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*/
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typedef CRITICAL_SECTION perl_mutex;
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#define MUTEX_INIT(m) InitializeCriticalSection(m)
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#define MUTEX_LOCK(m) EnterCriticalSection(m)
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#define MUTEX_UNLOCK(m) LeaveCriticalSection(m)
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#define MUTEX_DESTROY(m) DeleteCriticalSection(m)
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#else
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typedef HANDLE perl_mutex;
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# define MUTEX_INIT(m) \
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STMT_START { \
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if ((*(m) = CreateMutex(NULL,FALSE,NULL)) == NULL) \
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Perl_croak_nocontext("panic: MUTEX_INIT"); \
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} STMT_END
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# define MUTEX_LOCK(m) \
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STMT_START { \
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if (WaitForSingleObject(*(m),INFINITE) == WAIT_FAILED) \
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Perl_croak_nocontext("panic: MUTEX_LOCK"); \
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} STMT_END
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# define MUTEX_UNLOCK(m) \
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STMT_START { \
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if (ReleaseMutex(*(m)) == 0) \
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Perl_croak_nocontext("panic: MUTEX_UNLOCK"); \
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} STMT_END
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# define MUTEX_DESTROY(m) \
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STMT_START { \
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if (CloseHandle(*(m)) == 0) \
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Perl_croak_nocontext("panic: MUTEX_DESTROY"); \
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} STMT_END
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#endif
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/* These macros assume that the mutex associated with the condition
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* will always be held before COND_{SIGNAL,BROADCAST,WAIT,DESTROY},
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* so there's no separate mutex protecting access to (c)->waiters
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*/
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#define COND_INIT(c) \
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STMT_START { \
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(c)->waiters = 0; \
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(c)->sem = CreateSemaphore(NULL,0,LONG_MAX,NULL); \
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if ((c)->sem == NULL) \
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Perl_croak_nocontext("panic: COND_INIT (%ld)",GetLastError()); \
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} STMT_END
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#define COND_SIGNAL(c) \
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STMT_START { \
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if ((c)->waiters > 0 && \
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ReleaseSemaphore((c)->sem,1,NULL) == 0) \
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Perl_croak_nocontext("panic: COND_SIGNAL (%ld)",GetLastError()); \
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} STMT_END
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#define COND_BROADCAST(c) \
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STMT_START { \
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if ((c)->waiters > 0 && \
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ReleaseSemaphore((c)->sem,(c)->waiters,NULL) == 0) \
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Perl_croak_nocontext("panic: COND_BROADCAST (%ld)",GetLastError());\
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} STMT_END
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#define COND_WAIT(c, m) \
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STMT_START { \
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(c)->waiters++; \
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MUTEX_UNLOCK(m); \
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/* Note that there's no race here, since a \
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* COND_BROADCAST() on another thread will have seen the\
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* right number of waiters (i.e. including this one) */ \
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if (WaitForSingleObject((c)->sem,INFINITE)==WAIT_FAILED)\
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Perl_croak_nocontext("panic: COND_WAIT (%ld)",GetLastError()); \
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/* XXX there may be an inconsequential race here */ \
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MUTEX_LOCK(m); \
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(c)->waiters--; \
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} STMT_END
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#define COND_DESTROY(c) \
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STMT_START { \
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(c)->waiters = 0; \
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if (CloseHandle((c)->sem) == 0) \
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Perl_croak_nocontext("panic: COND_DESTROY (%ld)",GetLastError()); \
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} STMT_END
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#define DETACH(t) \
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STMT_START { \
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if (CloseHandle((t)->self) == 0) { \
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MUTEX_UNLOCK(&(t)->mutex); \
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Perl_croak_nocontext("panic: DETACH"); \
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} \
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} STMT_END
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#define THREAD_CREATE(t, f) Perl_thread_create(t, f)
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#define THREAD_POST_CREATE(t) NOOP
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/* XXX Docs mention that the RTL versions of thread creation routines
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* should be used, but that advice only seems applicable when the RTL
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* is not in a DLL. RTL DLLs in both Borland and VC seem to do all of
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* the init/deinit required upon DLL_THREAD_ATTACH/DETACH. So we seem
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* to be completely safe using straight Win32 API calls, rather than
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* the much braindamaged RTL calls.
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*
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* _beginthread() in the RTLs call CloseHandle() just after the thread
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* function returns, which means: 1) we have a race on our hands
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* 2) it is impossible to implement join() semantics.
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*
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* IOW, do *NOT* turn on USE_RTL_THREAD_API! It is here
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* for experimental purposes only. GSAR 98-01-02
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*/
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#ifdef USE_RTL_THREAD_API
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# include <process.h>
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# if defined(__BORLANDC__)
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/* Borland RTL doesn't allow a return value from thread function! */
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# define THREAD_RET_TYPE void _USERENTRY
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# define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p)))
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# elif defined (_MSC_VER)
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# define THREAD_RET_TYPE unsigned __stdcall
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# define THREAD_RET_CAST(p) ((unsigned)(p))
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# else
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/* CRTDLL.DLL doesn't allow a return value from thread function! */
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# define THREAD_RET_TYPE void __cdecl
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# define THREAD_RET_CAST(p) ((void)(thr->i.retv = (void *)(p)))
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# endif
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#else /* !USE_RTL_THREAD_API */
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# define THREAD_RET_TYPE DWORD WINAPI
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# define THREAD_RET_CAST(p) ((DWORD)(p))
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#endif /* !USE_RTL_THREAD_API */
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typedef THREAD_RET_TYPE thread_func_t(void *);
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START_EXTERN_C
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#if defined(PERLDLL) && defined(USE_DECLSPEC_THREAD) && (!defined(__BORLANDC__) || defined(_DLL))
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extern __declspec(thread) void *PL_current_context;
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#define PERL_SET_CONTEXT(t) (PL_current_context = t)
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#define PERL_GET_CONTEXT PL_current_context
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#else
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#define PERL_GET_CONTEXT Perl_get_context()
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#define PERL_SET_CONTEXT(t) Perl_set_context(t)
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#endif
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#if defined(USE_THREADS)
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struct perl_thread;
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int Perl_thread_create (struct perl_thread *thr, thread_func_t *fn);
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void Perl_set_thread_self (struct perl_thread *thr);
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void Perl_init_thread_intern (struct perl_thread *t);
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#define SET_THREAD_SELF(thr) Perl_set_thread_self(thr)
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#endif /* USE_THREADS */
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END_EXTERN_C
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#define INIT_THREADS NOOP
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#define ALLOC_THREAD_KEY \
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STMT_START { \
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if ((PL_thr_key = TlsAlloc()) == TLS_OUT_OF_INDEXES) { \
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fprintf(stderr,"panic: TlsAlloc"); \
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exit(1); \
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} \
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} STMT_END
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#define FREE_THREAD_KEY \
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STMT_START { \
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TlsFree(PL_thr_key); \
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} STMT_END
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#define PTHREAD_ATFORK(prepare,parent,child) NOOP
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#if defined(USE_RTL_THREAD_API) && !defined(_MSC_VER)
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#define JOIN(t, avp) \
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STMT_START { \
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if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
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|| (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \
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|| (CloseHandle((t)->self) == 0)) \
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Perl_croak_nocontext("panic: JOIN"); \
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*avp = (AV *)((t)->i.retv); \
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} STMT_END
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#else /* !USE_RTL_THREAD_API || _MSC_VER */
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#define JOIN(t, avp) \
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STMT_START { \
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if ((WaitForSingleObject((t)->self,INFINITE) == WAIT_FAILED) \
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|| (GetExitCodeThread((t)->self,(LPDWORD)(avp)) == 0) \
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|| (CloseHandle((t)->self) == 0)) \
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Perl_croak_nocontext("panic: JOIN"); \
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} STMT_END
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#endif /* !USE_RTL_THREAD_API || _MSC_VER */
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#define YIELD Sleep(0)
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#endif /* _WIN32THREAD_H */
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