/* 
 * tclWinThread.c --
 *
 *	This file implements the Windows-specific thread operations.
 *
 * Copyright (c) 1998 by Sun Microsystems, Inc.
 * Copyright (c) 1999 by Scriptics Corporation
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclWinThrd.c,v 1.22 2002/11/26 22:35:21 davygrvy Exp $
 * RCS: @(#) $Id: tclWinThrd.c,v 1.23 2002/12/10 00:34:15 hobbs Exp $
 */

#include "tclWinInt.h"

#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>

#if defined(_MSC_VER) || defined(__MSVCRT__) || defined(__BORLANDC__)
    _endthreadex((unsigned) status);
#else
    ExitThread((DWORD) status);
#endif
}


/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetCurrentThread --
 *
 *	This procedure returns the ID of the currently running thread.

 */

Tcl_ThreadId
Tcl_GetCurrentThread()
{
    return (Tcl_ThreadId)GetCurrentThreadId();
}


/*
 *----------------------------------------------------------------------
 *
 * TclpInitLock
 *
 *	This procedure is used to grab a lock that serializes initialization

	init = 1;
	InitializeCriticalSection(&joinLock);
	InitializeCriticalSection(&initLock);
	InitializeCriticalSection(&masterLock);
    }
    EnterCriticalSection(&initLock);
}


/*
 *----------------------------------------------------------------------
 *
 * TclpInitUnlock
 *
 *	This procedure is used to release a lock that serializes initialization

 */

void
TclpInitUnlock()
{
    LeaveCriticalSection(&initLock);
}


/*
 *----------------------------------------------------------------------
 *
 * TclpMasterLock
 *
 *	This procedure is used to grab a lock that serializes creation

	init = 1;
	InitializeCriticalSection(&joinLock);
	InitializeCriticalSection(&initLock);
	InitializeCriticalSection(&masterLock);
    }
    EnterCriticalSection(&masterLock);
}


/*
 *----------------------------------------------------------------------
 *
 * TclpMasterUnlock
 *
 *	This procedure is used to release a lock that serializes creation
 *	and deletion of synchronization objects.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Release the master mutex.
 *
 *----------------------------------------------------------------------
 */

void
TclpMasterUnlock()
{
    LeaveCriticalSection(&masterLock);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetAllocMutex
 *
 *	This procedure returns a pointer to a statically initialized


#ifdef TCL_THREADS

/* locally used prototype */
static void FinalizeConditionEvent(ClientData data);

/*
 *----------------------------------------------------------------------
 *
 * TclpMasterUnlock
 *
 *	This procedure is used to release a lock that serializes creation
 *	and deletion of synchronization objects.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Release the master mutex.
 *
 *----------------------------------------------------------------------
 */

void
TclpMasterUnlock()
{
    LeaveCriticalSection(&masterLock);
}


/*
 *----------------------------------------------------------------------
 *
 * Tcl_MutexLock --
 *
 *	This procedure is invoked to lock a mutex.  This is a self 

	    TclRememberMutex(mutexPtr);
	}
	MASTER_UNLOCK;
    }
    csPtr = *((CRITICAL_SECTION **)mutexPtr);
    EnterCriticalSection(csPtr);
}


/*
 *----------------------------------------------------------------------
 *
 * Tcl_MutexUnlock --
 *
 *	This procedure is invoked to unlock a mutex.

void
Tcl_MutexUnlock(mutexPtr)
    Tcl_Mutex *mutexPtr;	/* The lock */
{
    CRITICAL_SECTION *csPtr = *((CRITICAL_SECTION **)mutexPtr);
    LeaveCriticalSection(csPtr);
}


/*
 *----------------------------------------------------------------------
 *
 * TclpFinalizeMutex --
 *
 *	This procedure is invoked to clean up one mutex.  This is only

    CRITICAL_SECTION *csPtr = *(CRITICAL_SECTION **)mutexPtr;
    if (csPtr != NULL) {
	DeleteCriticalSection(csPtr);
	ckfree((char *)csPtr);
	*mutexPtr = NULL;
    }
}


/*
 *----------------------------------------------------------------------
 *
 * TclpThreadDataKeyInit --
 *
 *	This procedure initializes a thread specific data block key.

	indexPtr = (DWORD *)ckalloc(sizeof(DWORD));
	*indexPtr = TlsAlloc();
	*keyPtr = (Tcl_ThreadDataKey)indexPtr;
	TclRememberDataKey(keyPtr);
    }
    MASTER_UNLOCK;
}


/*
 *----------------------------------------------------------------------
 *
 * TclpThreadDataKeyGet --
 *
 *	This procedure returns a pointer to a block of thread local storage.

    DWORD *indexPtr = *(DWORD **)keyPtr;
    if (indexPtr == NULL) {
	return NULL;
    } else {
	return (VOID *) TlsGetValue(*indexPtr);
    }
}


/*
 *----------------------------------------------------------------------
 *
 * TclpThreadDataKeySet --
 *
 *	This procedure sets the pointer to a block of thread local storage.

    Tcl_ThreadDataKey *keyPtr;	/* Identifier for the data chunk,
				 * really (pthread_key_t **) */
    VOID *data;			/* Thread local storage */
{
    DWORD *indexPtr = *(DWORD **)keyPtr;
    TlsSetValue(*indexPtr, (void *)data);
}


/*
 *----------------------------------------------------------------------
 *
 * TclpFinalizeThreadData --
 *
 *	This procedure cleans up the thread-local storage.  This is

            tsdPtr->flags = WIN_THREAD_RUNNING;
	}
    }

    LeaveCriticalSection(&winCondPtr->condLock);
    EnterCriticalSection(csPtr);
}


/*
 *----------------------------------------------------------------------
 *
 * Tcl_ConditionNotify --
 *
 *	This procedure is invoked to signal a condition variable.

	LeaveCriticalSection(&winCondPtr->condLock);
    } else {
	/*
	 * Noone has used the condition variable, so there are no waiters.
	 */
    }
}


/*
 *----------------------------------------------------------------------
 *
 * FinalizeConditionEvent --
 *
 *	This procedure is invoked to clean up the per-thread