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/usr/i686-w64-mingw32/include/wct.h is in mingw-w64-i686-dev 2.0.3-1.

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/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
#ifndef _INC_WCT
#define _INC_WCT
#if (_WIN32_WINNT >= 0x0600)

#ifdef __cplusplus
extern "C" {
#endif

  typedef LPVOID HWCT;

  typedef enum _WCT_OBJECT_TYPE {
    WctCriticalSectionType = 1,
    WctSendMessageType,
    WctMutexType,
    WctAlpcType,
    WctComType,
    WctThreadWaitType,
    WctProcessWaitType,
    WctThreadType,
    WctComActivationType,
    WctUnknownType
  } WCT_OBJECT_TYPE;

  typedef enum _WCT_OBJECT_STATUS {
    WctStatusNoAccess = 1,
    WctStatusRunning,
    WctStatusBlocked,
    WctStatusPidOnly,
    WctStatusPidOnlyRpcss,
    WctStatusOwned,
    WctStatusNotOwned,
    WctStatusAbandoned,
    WctStatusUnknown,
    WctStatusError
  } WCT_OBJECT_STATUS;

  /* According to http://msdn.microsoft.com/en-us/magazine/cc163395.aspx
    RealObjectName has 0x8 offset and TimeOutLowPart has 0x108
    WCT_OBJNAME_LENGTH assumed to be 128 ((0x108-0x8)/sizeof (ushort) = 128)
  */
#define WCT_OBJNAME_LENGTH 128

  typedef struct _WAITCHAIN_NODE_INFO {
    WCT_OBJECT_TYPE   ObjectType;
    WCT_OBJECT_STATUS ObjectStatus;
    __C89_NAMELESS union {
      struct {
	WCHAR ObjectName[WCT_OBJNAME_LENGTH];
	LARGE_INTEGER Timeout;
	WINBOOL Alertable;
      } LockObject;
      struct {
	DWORD ProcessId;
	DWORD ThreadId;
	DWORD WaitTime;
	DWORD ContextSwitches;
      } ThreadObject;
    };
  } WAITCHAIN_NODE_INFO, *PWAITCHAIN_NODE_INFO;

  typedef VOID (CALLBACK *PWAITCHAINCALLBACK)(HWCT WctHandle,DWORD_PTR Context,DWORD CallbackStatus,LPDWORD NodeCount,PWAITCHAIN_NODE_INFO NodeInfoArray,LPBOOL IsCycle);

  HWCT WINAPI OpenThreadWaitChainSession(DWORD Flags,PWAITCHAINCALLBACK callback);
  VOID WINAPI CloseThreadWaitChainSession(HWCT WctHandle);
WINBOOL WINAPI GetThreadWaitChain(HWCT WctHandle,DWORD_PTR Context,DWORD Flags,DWORD ThreadId,LPDWORD NodeCount,PWAITCHAIN_NODE_INFO NodeInfoArray,LPBOOL IsCycle);

/* Unknown Callbacks */
typedef LPVOID (WINAPI *PCOGETCALLSTATE)();
typedef LPVOID (WINAPI *PCOGETACTIVATIONSTATE)();

VOID WINAPI RegisterWaitChainCOMCallback(PCOGETCALLSTATE CallStateCallback,PCOGETACTIVATIONSTATE ActivationStateCallback);

#ifdef __cplusplus
}
#endif

#endif /* (_WIN32_WINNT >= 0x0600) */
#endif /*_INC_WCT*/