693 lines
20 KiB
C
693 lines
20 KiB
C
/*
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* implement.h
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*
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* Definitions that don't need to be public.
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*
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* Keeps all the internals out of pthread.h
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef _IMPLEMENT_H
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#define _IMPLEMENT_H
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#ifdef _WIN32_WINNT
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#undef _WIN32_WINNT
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#endif
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#define _WIN32_WINNT 0x400
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#include <windows.h>
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/*
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* In case windows.h doesn't define it (e.g. WinCE perhaps)
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*/
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#ifdef WINCE
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typedef VOID (APIENTRY *PAPCFUNC)(DWORD dwParam);
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#endif
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/*
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* note: ETIMEDOUT is correctly defined in winsock.h
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*/
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#include <winsock.h>
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/*
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* In case ETIMEDOUT hasn't been defined above somehow.
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*/
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#ifndef ETIMEDOUT
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# define ETIMEDOUT 10060 /* This is the value in winsock.h. */
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#endif
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#if !defined(malloc)
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#include <malloc.h>
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#endif
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#if !defined(INT_MAX)
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#include <limits.h>
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#endif
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/* use local include files during development */
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#include "semaphore.h"
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#include "sched.h"
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#if defined(HAVE_C_INLINE) || defined(__cplusplus)
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#define INLINE inline
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#else
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#define INLINE
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#endif
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#if defined (__MINGW32__) || (_MSC_VER >= 1300)
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#define PTW32_INTERLOCKED_LONG long
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#define PTW32_INTERLOCKED_LPLONG long*
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#else
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#define PTW32_INTERLOCKED_LONG PVOID
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#define PTW32_INTERLOCKED_LPLONG PVOID*
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#endif
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#if defined(__MINGW32__)
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#include <stdint.h>
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#elif defined(__BORLANDC__)
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#define int64_t ULONGLONG
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#else
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#define int64_t _int64
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#endif
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typedef enum {
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/*
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* This enumeration represents the state of the thread;
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* The thread is still "alive" if the numeric value of the
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* state is greater or equal "PThreadStateRunning".
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*/
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PThreadStateInitial = 0, /* Thread not running */
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PThreadStateRunning, /* Thread alive & kicking */
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PThreadStateSuspended, /* Thread alive but suspended */
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PThreadStateCancelPending, /* Thread alive but is */
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/* has cancelation pending. */
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PThreadStateCanceling, /* Thread alive but is */
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/* in the process of terminating */
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/* due to a cancellation request */
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PThreadStateException, /* Thread alive but exiting */
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/* due to an exception */
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PThreadStateLast
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}
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PThreadState;
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typedef struct ptw32_thread_t_ ptw32_thread_t;
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struct ptw32_thread_t_ {
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#ifdef _UWIN
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DWORD dummy[5];
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#endif
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DWORD thread;
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HANDLE threadH; /* Win32 thread handle - POSIX thread is invalid if threadH == 0 */
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pthread_t ptHandle; /* This thread's permanent pthread_t handle */
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ptw32_thread_t * prevReuse; /* Links threads on reuse stack */
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volatile PThreadState state;
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void *exitStatus;
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void *parms;
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int ptErrno;
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int detachState;
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pthread_mutex_t threadLock; /* Used for serialised access to public thread state */
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int sched_priority; /* As set, not as currently is */
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pthread_mutex_t cancelLock; /* Used for async-cancel safety */
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int cancelState;
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int cancelType;
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HANDLE cancelEvent;
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#ifdef __CLEANUP_C
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jmp_buf start_mark;
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#endif /* __CLEANUP_C */
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#if HAVE_SIGSET_T
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sigset_t sigmask;
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#endif /* HAVE_SIGSET_T */
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int implicit:1;
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void *keys;
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void *nextAssoc;
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};
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/*
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* Special value to mark attribute objects as valid.
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*/
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#define PTW32_ATTR_VALID ((unsigned long) 0xC4C0FFEE)
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struct pthread_attr_t_ {
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unsigned long valid;
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void *stackaddr;
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size_t stacksize;
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int detachstate;
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struct sched_param param;
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int inheritsched;
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int contentionscope;
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#if HAVE_SIGSET_T
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sigset_t sigmask;
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#endif /* HAVE_SIGSET_T */
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};
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/*
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* ====================
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* ====================
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* Semaphores, Mutexes and Condition Variables
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* ====================
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* ====================
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*/
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struct sem_t_ {
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int value;
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pthread_mutex_t lock;
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HANDLE sem;
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#ifdef NEED_SEM
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int leftToUnblock;
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#endif
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};
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#define PTW32_OBJECT_AUTO_INIT ((void *) -1)
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#define PTW32_OBJECT_INVALID NULL
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struct pthread_mutex_t_ {
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LONG lock_idx; /* Provides exclusive access to mutex state
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via the Interlocked* mechanism.
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0: unlocked/free.
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1: locked - no other waiters.
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-1: locked - with possible other waiters.
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*/
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int recursive_count; /* Number of unlocks a thread needs to perform
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before the lock is released (recursive
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mutexes only). */
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int kind; /* Mutex type. */
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pthread_t ownerThread;
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HANDLE event; /* Mutex release notification to waiting
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threads. */
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};
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struct pthread_mutexattr_t_ {
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int pshared;
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int kind;
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};
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/*
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* Possible values, other than PTW32_OBJECT_INVALID,
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* for the "interlock" element in a spinlock.
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*
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* In this implementation, when a spinlock is initialised,
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* the number of cpus available to the process is checked.
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* If there is only one cpu then "interlock" is set equal to
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* PTW32_SPIN_USE_MUTEX and u.mutex is a initialised mutex.
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* If the number of cpus is greater than 1 then "interlock"
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* is set equal to PTW32_SPIN_UNLOCKED and the number is
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* stored in u.cpus. This arrangement allows the spinlock
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* routines to attempt an InterlockedCompareExchange on "interlock"
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* immediately and, if that fails, to try the inferior mutex.
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*
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* "u.cpus" isn't used for anything yet, but could be used at
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* some point to optimise spinlock behaviour.
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*/
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#define PTW32_SPIN_UNLOCKED (1)
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#define PTW32_SPIN_LOCKED (2)
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#define PTW32_SPIN_USE_MUTEX (3)
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struct pthread_spinlock_t_ {
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long interlock; /* Locking element for multi-cpus. */
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union {
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int cpus; /* No. of cpus if multi cpus, or */
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pthread_mutex_t mutex; /* mutex if single cpu. */
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} u;
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};
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struct pthread_barrier_t_ {
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unsigned int nCurrentBarrierHeight;
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unsigned int nInitialBarrierHeight;
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int iStep;
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int pshared;
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sem_t semBarrierBreeched[2];
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};
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struct pthread_barrierattr_t_ {
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int pshared;
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};
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struct pthread_key_t_ {
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DWORD key;
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void (*destructor) (void *);
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pthread_mutex_t keyLock;
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void *threads;
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};
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typedef struct ThreadParms ThreadParms;
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typedef struct ThreadKeyAssoc ThreadKeyAssoc;
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struct ThreadParms {
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pthread_t tid;
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void *(*start) (void *);
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void *arg;
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};
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struct pthread_cond_t_ {
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long nWaitersBlocked; /* Number of threads blocked */
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long nWaitersGone; /* Number of threads timed out */
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long nWaitersToUnblock; /* Number of threads to unblock */
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sem_t semBlockQueue; /* Queue up threads waiting for the */
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/* condition to become signalled */
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sem_t semBlockLock; /* Semaphore that guards access to */
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/* | waiters blocked count/block queue */
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/* +-> Mandatory Sync.LEVEL-1 */
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pthread_mutex_t mtxUnblockLock; /* Mutex that guards access to */
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/* | waiters (to)unblock(ed) counts */
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/* +-> Optional* Sync.LEVEL-2 */
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pthread_cond_t next; /* Doubly linked list */
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pthread_cond_t prev;
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};
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struct pthread_condattr_t_ {
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int pshared;
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};
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#define PTW32_RWLOCK_MAGIC 0xfacade2
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struct pthread_rwlock_t_ {
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pthread_mutex_t mtxExclusiveAccess;
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pthread_mutex_t mtxSharedAccessCompleted;
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pthread_cond_t cndSharedAccessCompleted;
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int nSharedAccessCount;
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int nExclusiveAccessCount;
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int nCompletedSharedAccessCount;
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int nMagic;
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};
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struct pthread_rwlockattr_t_ {
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int pshared;
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};
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/*
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* MCS lock queue node - see ptw32_MCS_lock.c
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*/
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struct ptw32_mcs_node_t_ {
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struct ptw32_mcs_node_t_ **lock; /* ptr to tail of queue */
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struct ptw32_mcs_node_t_ *next; /* ptr to successor in queue */
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LONG readyFlag; /* set after lock is released by
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predecessor */
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LONG nextFlag; /* set after 'next' ptr is set by
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successor */
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};
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typedef struct ptw32_mcs_node_t_ ptw32_mcs_local_node_t;
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typedef struct ptw32_mcs_node_t_ *ptw32_mcs_lock_t;
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struct ThreadKeyAssoc {
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/*
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* Purpose:
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* This structure creates an association between a thread and a key.
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* It is used to implement the implicit invocation of a user defined
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* destroy routine for thread specific data registered by a user upon
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* exiting a thread.
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*
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* Graphically, the arrangement is as follows, where:
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*
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* K - Key with destructor
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* (head of chain is key->threads)
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* T - Thread that has called pthread_setspecific(Kn)
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* (head of chain is thread->keys)
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* A - Association. Each association is a node at the
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* intersection of two doubly-linked lists.
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*
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* T1 T2 T3
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* | | |
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* | | |
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* K1 -----+-----A-----A----->
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* | | |
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* | | |
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* K2 -----A-----A-----+----->
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* | | |
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* | | |
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* K3 -----A-----+-----A----->
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* | | |
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* | | |
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* V V V
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*
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* Access to the association is guarded by two locks: the key's
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* general lock (guarding the row) and the thread's general
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* lock (guarding the column). This avoids the need for a
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* dedicated lock for each association, which not only consumes
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* more handles but requires that: before the lock handle can
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* be released - both the key must be deleted and the thread
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* must have called the destructor. The two-lock arrangement
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* allows the resources to be freed as soon as either thread or
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* key is concluded.
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*
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* To avoid deadlock: whenever both locks are required, the key
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* and thread locks are always acquired in the order: key lock
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* then thread lock. An exception to this exists when a thread
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* calls the destructors, however this is done carefully to
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* avoid deadlock.
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*
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* An association is created when a thread first calls
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* pthread_setspecific() on a key that has a specified
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* destructor.
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*
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* An association is destroyed either immediately after the
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* thread calls the key destructor function on thread exit, or
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* when the key is deleted.
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*
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* Attributes:
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* thread
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* reference to the thread that owns the
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* association. This is actually the pointer to the
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* thread struct itself. Since the association is
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* destroyed before the thread exits, this can never
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* point to a different logical thread to the one that
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* created the assoc, i.e. after thread struct reuse.
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*
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* key
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* reference to the key that owns the association.
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*
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* nextKey
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* The pthread_t->keys attribute is the head of a
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* chain of associations that runs through the nextKey
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* link. This chain provides the 1 to many relationship
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* between a pthread_t and all pthread_key_t on which
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* it called pthread_setspecific.
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*
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* prevKey
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* Similarly.
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*
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* nextThread
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* The pthread_key_t->threads attribute is the head of
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* a chain of assoctiations that runs through the
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* nextThreads link. This chain provides the 1 to many
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* relationship between a pthread_key_t and all the
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* PThreads that have called pthread_setspecific for
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* this pthread_key_t.
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*
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* prevThread
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* Similarly.
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*
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* Notes:
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* 1) As soon as either the key or the thread is no longer
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* referencing the association, it can be destroyed. The
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* association will be removed from both chains.
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*
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* 2) Under WIN32, an association is only created by
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* pthread_setspecific if the user provided a
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* destroyRoutine when they created the key.
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*
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*
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*/
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ptw32_thread_t * thread;
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pthread_key_t key;
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ThreadKeyAssoc *nextKey;
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ThreadKeyAssoc *nextThread;
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ThreadKeyAssoc *prevKey;
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ThreadKeyAssoc *prevThread;
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};
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#ifdef __CLEANUP_SEH
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/*
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* --------------------------------------------------------------
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* MAKE_SOFTWARE_EXCEPTION
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* This macro constructs a software exception code following
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* the same format as the standard Win32 error codes as defined
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* in WINERROR.H
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* Values are 32 bit values layed out as follows:
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*
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +---+-+-+-----------------------+-------------------------------+
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* |Sev|C|R| Facility | Code |
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* +---+-+-+-----------------------+-------------------------------+
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*
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* Severity Values:
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*/
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#define SE_SUCCESS 0x00
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#define SE_INFORMATION 0x01
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#define SE_WARNING 0x02
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#define SE_ERROR 0x03
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#define MAKE_SOFTWARE_EXCEPTION( _severity, _facility, _exception ) \
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( (DWORD) ( ( (_severity) << 30 ) | /* Severity code */ \
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( 1 << 29 ) | /* MS=0, User=1 */ \
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( 0 << 28 ) | /* Reserved */ \
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( (_facility) << 16 ) | /* Facility Code */ \
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( (_exception) << 0 ) /* Exception Code */ \
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) )
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/*
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* We choose one specific Facility/Error code combination to
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* identify our software exceptions vs. WIN32 exceptions.
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* We store our actual component and error code within
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* the optional information array.
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*/
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#define EXCEPTION_PTW32_SERVICES \
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MAKE_SOFTWARE_EXCEPTION( SE_ERROR, \
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PTW32_SERVICES_FACILITY, \
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PTW32_SERVICES_ERROR )
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#define PTW32_SERVICES_FACILITY 0xBAD
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#define PTW32_SERVICES_ERROR 0xDEED
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#endif /* __CLEANUP_SEH */
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/*
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* Services available through EXCEPTION_PTW32_SERVICES
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* and also used [as parameters to ptw32_throw()] as
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* generic exception selectors.
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*/
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#define PTW32_EPS_EXIT (1)
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#define PTW32_EPS_CANCEL (2)
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/* Useful macros */
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#define PTW32_MAX(a,b) ((a)<(b)?(b):(a))
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#define PTW32_MIN(a,b) ((a)>(b)?(b):(a))
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/* Declared in global.c */
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extern PTW32_INTERLOCKED_LONG (WINAPI *
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ptw32_interlocked_compare_exchange)
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(PTW32_INTERLOCKED_LPLONG, PTW32_INTERLOCKED_LONG, PTW32_INTERLOCKED_LONG);
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/* Declared in pthread_cancel.c */
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extern DWORD (*ptw32_register_cancelation) (PAPCFUNC, HANDLE, DWORD);
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/* Thread Reuse stack bottom marker. Must not be NULL or any valid pointer to memory. */
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#define PTW32_THREAD_REUSE_EMPTY ((ptw32_thread_t *) 1)
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extern int ptw32_processInitialized;
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extern ptw32_thread_t * ptw32_threadReuseTop;
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extern ptw32_thread_t * ptw32_threadReuseBottom;
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extern pthread_key_t ptw32_selfThreadKey;
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extern pthread_key_t ptw32_cleanupKey;
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extern pthread_cond_t ptw32_cond_list_head;
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extern pthread_cond_t ptw32_cond_list_tail;
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extern int ptw32_mutex_default_kind;
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extern int ptw32_concurrency;
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extern int ptw32_features;
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extern BOOL ptw32_smp_system; /* True: SMP system, False: Uni-processor system */
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extern CRITICAL_SECTION ptw32_thread_reuse_lock;
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extern CRITICAL_SECTION ptw32_mutex_test_init_lock;
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extern CRITICAL_SECTION ptw32_cond_list_lock;
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extern CRITICAL_SECTION ptw32_cond_test_init_lock;
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extern CRITICAL_SECTION ptw32_rwlock_test_init_lock;
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extern CRITICAL_SECTION ptw32_spinlock_test_init_lock;
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#ifdef _UWIN
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extern int pthread_count;
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#endif
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/*
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* =====================
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* =====================
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* Forward Declarations
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* =====================
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* =====================
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*/
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int ptw32_is_attr (const pthread_attr_t * attr);
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int ptw32_cond_check_need_init (pthread_cond_t * cond);
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int ptw32_mutex_check_need_init (pthread_mutex_t * mutex);
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int ptw32_rwlock_check_need_init (pthread_rwlock_t * rwlock);
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PTW32_INTERLOCKED_LONG WINAPI
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ptw32_InterlockedCompareExchange (PTW32_INTERLOCKED_LPLONG location,
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PTW32_INTERLOCKED_LONG value,
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PTW32_INTERLOCKED_LONG comparand);
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LONG WINAPI
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ptw32_InterlockedExchange (LPLONG location,
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LONG value);
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DWORD
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ptw32_RegisterCancelation (PAPCFUNC callback,
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HANDLE threadH, DWORD callback_arg);
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int ptw32_processInitialize (void);
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void ptw32_processTerminate (void);
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void ptw32_threadDestroy (pthread_t tid);
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void ptw32_pop_cleanup_all (int execute);
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pthread_t ptw32_new (void);
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pthread_t ptw32_threadReusePop (void);
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void ptw32_threadReusePush (pthread_t thread);
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int ptw32_getprocessors (int *count);
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int ptw32_setthreadpriority (pthread_t thread, int policy, int priority);
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void ptw32_rwlock_cancelwrwait (void *arg);
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#if ! defined (__MINGW32__) || defined (__MSVCRT__)
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unsigned __stdcall
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#else
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void
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#endif
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ptw32_threadStart (void *vthreadParms);
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void ptw32_callUserDestroyRoutines (pthread_t thread);
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int ptw32_tkAssocCreate (ptw32_thread_t * thread, pthread_key_t key);
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void ptw32_tkAssocDestroy (ThreadKeyAssoc * assoc);
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int ptw32_semwait (sem_t * sem);
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DWORD ptw32_relmillisecs (const struct timespec * abstime);
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void ptw32_mcs_lock_acquire (ptw32_mcs_lock_t * lock, ptw32_mcs_local_node_t * node);
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void ptw32_mcs_lock_release (ptw32_mcs_local_node_t * node);
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#ifdef NEED_FTIME
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void ptw32_timespec_to_filetime (const struct timespec *ts, FILETIME * ft);
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void ptw32_filetime_to_timespec (const FILETIME * ft, struct timespec *ts);
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#endif
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/* Declared in misc.c */
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#ifdef NEED_CALLOC
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#define calloc(n, s) ptw32_calloc(n, s)
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void *ptw32_calloc (size_t n, size_t s);
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#endif
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/* Declared in private.c */
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void ptw32_throw (DWORD exception);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#ifdef _UWIN_
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# ifdef _MT
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# ifdef __cplusplus
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extern "C"
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{
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# endif
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_CRTIMP unsigned long __cdecl _beginthread (void (__cdecl *) (void *),
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unsigned, void *);
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_CRTIMP void __cdecl _endthread (void);
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_CRTIMP unsigned long __cdecl _beginthreadex (void *, unsigned,
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unsigned (__stdcall *) (void *),
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void *, unsigned, unsigned *);
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_CRTIMP void __cdecl _endthreadex (unsigned);
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# ifdef __cplusplus
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}
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# endif
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# endif
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#else
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# include <process.h>
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#endif
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/*
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* Defaults. Could be overridden when building the inlined version of the dll.
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* See ptw32_InterlockedCompareExchange.c
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*/
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#ifndef PTW32_INTERLOCKED_COMPARE_EXCHANGE
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#define PTW32_INTERLOCKED_COMPARE_EXCHANGE ptw32_interlocked_compare_exchange
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#endif
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#ifndef PTW32_INTERLOCKED_EXCHANGE
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#define PTW32_INTERLOCKED_EXCHANGE InterlockedExchange
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#endif
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/*
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* Check for old and new versions of cygwin. See the FAQ file:
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*
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* Question 1 - How do I get pthreads-win32 to link under Cygwin or Mingw32?
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*
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* Patch by Anders Norlander <anorland@hem2.passagen.se>
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*/
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#if defined(__CYGWIN32__) || defined(__CYGWIN__) || defined(NEED_CREATETHREAD)
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/*
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* Macro uses args so we can cast start_proc to LPTHREAD_START_ROUTINE
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* in order to avoid warnings because of return type
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*/
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#define _beginthreadex(security, \
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stack_size, \
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start_proc, \
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arg, \
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flags, \
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pid) \
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CreateThread(security, \
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stack_size, \
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(LPTHREAD_START_ROUTINE) start_proc, \
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arg, \
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flags, \
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pid)
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#define _endthreadex ExitThread
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#endif /* __CYGWIN32__ || __CYGWIN__ || NEED_CREATETHREAD */
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#endif /* _IMPLEMENT_H */
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