forked from 0ad/0ad
janwas
f25f6a2d70
win internal files: slight changes while looking through This was SVN commit r1850.
235 lines
5.5 KiB
C++
235 lines
5.5 KiB
C++
// partial pthread implementation for Win32
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//
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// Copyright (c) 2003-2005 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#include "precompiled.h"
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#include <new>
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#include <process.h>
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#include "lib.h"
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#include "win_internal.h"
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#include "wpthread.h"
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static HANDLE pthread_t_to_HANDLE(pthread_t p)
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{
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return (HANDLE)((char*)0 + p);
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}
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static pthread_t HANDLE_to_pthread_t(HANDLE h)
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{
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return (pthread_t)(uintptr_t)h;
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}
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pthread_t pthread_self(void)
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{
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return HANDLE_to_pthread_t(GetCurrentThread());
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}
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int pthread_getschedparam(pthread_t thread, int* policy, struct sched_param* param)
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{
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if(policy)
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{
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DWORD pc = GetPriorityClass(GetCurrentProcess());
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*policy = (pc >= HIGH_PRIORITY_CLASS)? SCHED_FIFO : SCHED_RR;
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}
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if(param)
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{
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const HANDLE hThread = pthread_t_to_HANDLE(thread);
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param->sched_priority = GetThreadPriority(hThread);
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}
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return 0;
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}
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int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param* param)
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{
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const int pri = param->sched_priority;
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// additional boost for policy == SCHED_FIFO
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DWORD pri_class = NORMAL_PRIORITY_CLASS;
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if(policy == SCHED_FIFO)
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{
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pri_class = HIGH_PRIORITY_CLASS;
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if(pri == 2)
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pri_class = REALTIME_PRIORITY_CLASS;
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}
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SetPriorityClass(GetCurrentProcess(), pri_class);
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// choose fixed Windows values from pri
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const HANDLE hThread = pthread_t_to_HANDLE(thread);
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SetThreadPriority(hThread, pri);
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return 0;
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}
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struct ThreadParam
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{
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void*(*func)(void*);
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void* user_arg;
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ThreadParam(void*(*_func)(void*), void* _user_arg)
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: func(_func), user_arg(_user_arg) {}
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};
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// trampoline to switch calling convention.
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// param points to a heap-allocated ThreadParam (see pthread_create).
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static unsigned __stdcall thread_start(void* param)
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{
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ThreadParam* f = (ThreadParam*)param;
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void*(*func)(void*) = f->func;
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void* user_arg = f->user_arg;
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delete f;
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// workaround for stupid "void* -> unsigned cast" warning
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union { void* p; unsigned u; } v;
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v.p = func(user_arg);
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return v.u;
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}
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int pthread_create(pthread_t* thread, const void* attr, void*(*func)(void*), void* user_arg)
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{
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UNUSED(attr);
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// note: don't stack-allocate param: thread_start might not be called
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// in the new thread before we exit this stack frame.
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ThreadParam* param = new ThreadParam(func, user_arg);
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*thread = (pthread_t)_beginthreadex(0, 0, thread_start, (void*)param, 0, 0);
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return 0;
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}
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void pthread_cancel(pthread_t thread)
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{
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HANDLE hThread = pthread_t_to_HANDLE(thread);
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TerminateThread(hThread, 0);
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}
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void pthread_join(pthread_t thread, void** value_ptr)
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{
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HANDLE hThread = pthread_t_to_HANDLE(thread);
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// clean exit
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if(WaitForSingleObject(hThread, 100) == WAIT_OBJECT_0)
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{
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if(value_ptr)
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GetExitCodeThread(hThread, (LPDWORD)value_ptr);
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}
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// force close
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else
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TerminateThread(hThread, 0);
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if(value_ptr)
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*value_ptr = (void*)-1;
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CloseHandle(hThread);
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}
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// DeleteCriticalSection currently doesn't complain if we double-free
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// (e.g. user calls destroy() and static initializer atexit runs),
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// and dox are ambiguous.
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// note: pthread_mutex_t must not be an opaque struct, because the
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// initializer returns pthread_mutex_t directly and CRITICAL_SECTIONS
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// shouldn't be copied.
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//
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// note: must not use new/malloc to allocate the critical section
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// because mmgr.cpp uses a mutex and must not be called to allocate
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// anything before it is initialized.
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pthread_mutex_t pthread_mutex_initializer()
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{
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CRITICAL_SECTION* cs = (CRITICAL_SECTION*)HeapAlloc(GetProcessHeap(), 0, sizeof(CRITICAL_SECTION));
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InitializeCriticalSection(cs);
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return (pthread_mutex_t)cs;
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}
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int pthread_mutex_destroy(pthread_mutex_t* m)
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{
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CRITICAL_SECTION* cs = (CRITICAL_SECTION*)(*m);
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DeleteCriticalSection(cs);
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HeapFree(GetProcessHeap(), 0, cs);
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return 0;
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}
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int pthread_mutex_init(pthread_mutex_t* m, const pthread_mutexattr_t*)
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{
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*m = pthread_mutex_initializer();
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return 0;
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}
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int pthread_mutex_lock(pthread_mutex_t* m)
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{
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CRITICAL_SECTION* cs = (CRITICAL_SECTION*)(*m);
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EnterCriticalSection(cs);
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return 0;
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}
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int pthread_mutex_trylock(pthread_mutex_t* m)
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{
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CRITICAL_SECTION* cs = (CRITICAL_SECTION*)(*m);
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BOOL got_it = TryEnterCriticalSection(cs);
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return got_it? 0 : -1;
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}
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int pthread_mutex_unlock(pthread_mutex_t* m)
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{
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CRITICAL_SECTION* cs = (CRITICAL_SECTION*)(*m);
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LeaveCriticalSection(cs);
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return 0;
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}
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int pthread_mutex_timedlock(pthread_mutex_t* m, const struct timespec* abs_timeout)
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{
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UNUSED(m);
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UNUSED(abs_timeout);
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return -ENOSYS;
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}
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int sem_init(sem_t* sem, int pshared, unsigned value)
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{
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UNUSED(pshared);
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*sem = (uintptr_t)CreateSemaphore(0, (LONG)value, 0x7fffffff, 0);
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return 0;
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}
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int sem_post(sem_t* sem)
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{
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ReleaseSemaphore((HANDLE)*sem, 1, 0);
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return 0;
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}
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int sem_wait(sem_t* sem)
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{
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WaitForSingleObject((HANDLE)*sem, INFINITE);
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return 0;
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}
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int sem_destroy(sem_t* sem)
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{
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CloseHandle((HANDLE)*sem);
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return 0;
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}
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