tclwinconsole.c

这是leon3处理器的交叉编译链

     */

    if (mode == TCL_MODE_NONBLOCKING) {
	infoPtr->flags |= CONSOLE_ASYNC;
    } else {
	infoPtr->flags &= ~(CONSOLE_ASYNC);
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleCloseProc --
 *
 *	Closes a console based IO channel.
 *
 * Results:
 *	0 on success, errno otherwise.
 *
 * Side effects:
 *	Closes the physical channel.
 *
 *----------------------------------------------------------------------
 */

static int
ConsoleCloseProc(
    ClientData instanceData,	/* Pointer to ConsoleInfo structure. */
    Tcl_Interp *interp)		/* For error reporting. */
{
    ConsoleInfo *consolePtr = (ConsoleInfo *) instanceData;
    int errorCode;
    ConsoleInfo *infoPtr, **nextPtrPtr;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    errorCode = 0;
    
    /*
     * Clean up the background thread if necessary.  Note that this
     * must be done before we can close the file, since the 
     * thread may be blocking trying to read from the console.
     */
    
    if (consolePtr->readThread) {
	/*
	 * Forcibly terminate the background thread.  We cannot rely on the
	 * thread to cleanly terminate itself because we have no way of
	 * closing the handle without blocking in the case where the
	 * thread is in the middle of an I/O operation.  Note that we need
	 * to guard against terminating the thread while it is in the
	 * middle of Tcl_ThreadAlert because it won't be able to release
	 * the notifier lock.
	 */

	Tcl_MutexLock(&consoleMutex);
	TerminateThread(consolePtr->readThread, 0);

	/*
	 * Wait for the thread to terminate.  This ensures that we are
	 * completely cleaned up before we leave this function. 
	 */

	WaitForSingleObject(consolePtr->readThread, INFINITE);
	Tcl_MutexUnlock(&consoleMutex);

	CloseHandle(consolePtr->readThread);
	CloseHandle(consolePtr->readable);
	CloseHandle(consolePtr->startReader);
	consolePtr->readThread = NULL;
    }
    consolePtr->validMask &= ~TCL_READABLE;

    /*
     * Wait for the writer thread to finish the current buffer, then
     * terminate the thread and close the handles.  If the channel is
     * nonblocking, there should be no pending write operations.
     */
    
    if (consolePtr->writeThread) {
	if (consolePtr->toWrite) {
	    /*
	     * We only need to wait if there is something to write.
	     * This may prevent infinite wait on exit. [python bug 216289]
	     */
	    WaitForSingleObject(consolePtr->writable, INFINITE);
	}

	/*
	 * Forcibly terminate the background thread.  We cannot rely on the
	 * thread to cleanly terminate itself because we have no way of
	 * closing the handle without blocking in the case where the
	 * thread is in the middle of an I/O operation.  Note that we need
	 * to guard against terminating the thread while it is in the
	 * middle of Tcl_ThreadAlert because it won't be able to release
	 * the notifier lock.
	 */

	Tcl_MutexLock(&consoleMutex);
	TerminateThread(consolePtr->writeThread, 0);

	/*
	 * Wait for the thread to terminate.  This ensures that we are
	 * completely cleaned up before we leave this function. 
	 */

	WaitForSingleObject(consolePtr->writeThread, INFINITE);
	Tcl_MutexUnlock(&consoleMutex);

	CloseHandle(consolePtr->writeThread);
	CloseHandle(consolePtr->writable);
	CloseHandle(consolePtr->startWriter);
	consolePtr->writeThread = NULL;
    }
    consolePtr->validMask &= ~TCL_WRITABLE;


    /*
     * Don't close the Win32 handle if the handle is a standard channel
     * during the exit process.  Otherwise, one thread may kill the stdio
     * of another.
     */

    if (!TclInExit() 
	    || ((GetStdHandle(STD_INPUT_HANDLE) != consolePtr->handle)
		&& (GetStdHandle(STD_OUTPUT_HANDLE) != consolePtr->handle)
		&& (GetStdHandle(STD_ERROR_HANDLE) != consolePtr->handle))) {
	if (CloseHandle(consolePtr->handle) == FALSE) {
	    TclWinConvertError(GetLastError());
	    errorCode = errno;
	}
    }
    
    consolePtr->watchMask &= consolePtr->validMask;

    /*
     * Remove the file from the list of watched files.
     */

    for (nextPtrPtr = &(tsdPtr->firstConsolePtr), infoPtr = *nextPtrPtr;
	    infoPtr != NULL;
	    nextPtrPtr = &infoPtr->nextPtr, infoPtr = *nextPtrPtr) {
	if (infoPtr == (ConsoleInfo *)consolePtr) {
	    *nextPtrPtr = infoPtr->nextPtr;
	    break;
	}
    }
    if (consolePtr->writeBuf != NULL) {
	ckfree(consolePtr->writeBuf);
	consolePtr->writeBuf = 0;
    }
    ckfree((char*) consolePtr);

    return errorCode;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleInputProc --
 *
 *	Reads input from the IO channel into the buffer given. Returns
 *	count of how many bytes were actually read, and an error indication.
 *
 * Results:
 *	A count of how many bytes were read is returned and an error
 *	indication is returned in an output argument.
 *
 * Side effects:
 *	Reads input from the actual channel.
 *
 *----------------------------------------------------------------------
 */

static int
ConsoleInputProc(
    ClientData instanceData,		/* Console state. */
    char *buf,				/* Where to store data read. */
    int bufSize,			/* How much space is available
                                         * in the buffer? */
    int *errorCode)			/* Where to store error code. */
{
    ConsoleInfo *infoPtr = (ConsoleInfo *) instanceData;
    DWORD count, bytesRead = 0;
    int result;

    *errorCode = 0;

    /*
     * Synchronize with the reader thread.
     */
    
    result = WaitForRead(infoPtr, (infoPtr->flags & CONSOLE_ASYNC) ? 0 : 1);
    
    /*
     * If an error occurred, return immediately.
     */
    
    if (result == -1) {
	*errorCode = errno;
	return -1;
    }

    if (infoPtr->readFlags & CONSOLE_BUFFERED) {
	/*
	 * Data is stored in the buffer.
	 */

	if (bufSize < (infoPtr->bytesRead - infoPtr->offset)) {
	    memcpy(buf, &infoPtr->buffer[infoPtr->offset], (size_t) bufSize);
	    bytesRead = bufSize;
	    infoPtr->offset += bufSize;
	} else {
	    memcpy(buf, &infoPtr->buffer[infoPtr->offset], (size_t) bufSize);
	    bytesRead = infoPtr->bytesRead - infoPtr->offset;

	    /*
	     * Reset the buffer
	     */
	    
	    infoPtr->readFlags &= ~CONSOLE_BUFFERED;
	    infoPtr->offset = 0;
	}

	return bytesRead;
    }
    
    /*
     * Attempt to read bufSize bytes.  The read will return immediately
     * if there is any data available.  Otherwise it will block until
     * at least one byte is available or an EOF occurs.
     */

    if (ReadConsole(infoPtr->handle, (LPVOID) buf, (DWORD) bufSize, &count,
		    (LPOVERLAPPED) NULL) == TRUE) {
	buf[count] = '\0';
	return count;
    }

    return -1;
}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleOutputProc --
 *
 *	Writes the given output on the IO channel. Returns count of how
 *	many characters were actually written, and an error indication.
 *
 * Results:
 *	A count of how many characters were written is returned and an
 *	error indication is returned in an output argument.
 *
 * Side effects:
 *	Writes output on the actual channel.
 *
 *----------------------------------------------------------------------
 */

static int
ConsoleOutputProc(
    ClientData instanceData,		/* Console state. */
    CONST char *buf,			/* The data buffer. */
    int toWrite,			/* How many bytes to write? */
    int *errorCode)			/* Where to store error code. */
{
    ConsoleInfo *infoPtr = (ConsoleInfo *) instanceData;
    DWORD bytesWritten, timeout;
    
    *errorCode = 0;
    timeout = (infoPtr->flags & CONSOLE_ASYNC) ? 0 : INFINITE;
    if (WaitForSingleObject(infoPtr->writable, timeout) == WAIT_TIMEOUT) {
	/*
	 * The writer thread is blocked waiting for a write to complete
	 * and the channel is in non-blocking mode.
	 */

	errno = EAGAIN;
	goto error;
    }
    
    /*
     * Check for a background error on the last write.
     */

    if (infoPtr->writeError) {
	TclWinConvertError(infoPtr->writeError);
	infoPtr->writeError = 0;
	goto error;
    }

    if (infoPtr->flags & CONSOLE_ASYNC) {
	/*
	 * The console is non-blocking, so copy the data into the output
	 * buffer and restart the writer thread.
	 */

	if (toWrite > infoPtr->writeBufLen) {
	    /*
	     * Reallocate the buffer to be large enough to hold the data.
	     */

	    if (infoPtr->writeBuf) {
		ckfree(infoPtr->writeBuf);
	    }
	    infoPtr->writeBufLen = toWrite;
	    infoPtr->writeBuf = ckalloc((unsigned int) toWrite);
	}
	memcpy(infoPtr->writeBuf, buf, (size_t) toWrite);
	infoPtr->toWrite = toWrite;
	ResetEvent(infoPtr->writable);
	SetEvent(infoPtr->startWriter);
	bytesWritten = toWrite;
    } else {
	/*
	 * In the blocking case, just try to write the buffer directly.
	 * This avoids an unnecessary copy.
	 */

	if (WriteFile(infoPtr->handle, (LPVOID) buf, (DWORD) toWrite,
		&bytesWritten, (LPOVERLAPPED) NULL) == FALSE) {
	    TclWinConvertError(GetLastError());
	    goto error;
	}
    }
    return bytesWritten;

    error:
    *errorCode = errno;
    return -1;

}

/*
 *----------------------------------------------------------------------
 *
 * ConsoleEventProc --
 *
 *	This function is invoked by Tcl_ServiceEvent when a file event
 *	reaches the front of the event queue.  This procedure invokes
 *	Tcl_NotifyChannel on the console.
 *
 * Results:
 *	Returns 1 if the event was handled, meaning it should be removed
 *	from the queue.  Returns 0 if the event was not handled, meaning
 *	it should stay on the queue.  The only time the event isn't
 *	handled is if the TCL_FILE_EVENTS flag bit isn't set.
 *
 * Side effects:
 *	Whatever the notifier callback does.
 *
 *----------------------------------------------------------------------
 */

static int
ConsoleEventProc(
    Tcl_Event *evPtr,		/* Event to service. */
    int flags)			/* Flags that indicate what events to
				 * handle, such as TCL_FILE_EVENTS. */
{
    ConsoleEvent *consoleEvPtr = (ConsoleEvent *)evPtr;
    ConsoleInfo *infoPtr;
    int mask;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    if (!(flags & TCL_FILE_EVENTS)) {
	return 0;
    }

    /*
     * Search through the list of watched consoles for the one whose handle
     * matches the event.  We do this rather than simply dereferencing
     * the handle in the event so that consoles can be deleted while the
     * event is in the queue.
     */

    for (infoPtr = tsdPtr->firstConsolePtr; infoPtr != NULL;
	    infoPtr = infoPtr->nextPtr) {
	if (consoleEvPtr->infoPtr == infoPtr) {
	    infoPtr->flags &= ~(CONSOLE_PENDING);
	    break;
	}
    }

    /*
     * Remove stale events.
     */

    if (!infoPtr) {
	return 1;
    }

    /*
     * Check to see if the console is readable.  Note
     * that we can't tell if a console is writable, so we always report it
     * as being writable unless we have detected EOF.
     */

    mask = 0;
    if (infoPtr->watchMask & TCL_WRITABLE) {
	if (WaitForSingleObject(infoPtr->writable, 0) != WAIT_TIMEOUT) {
	    mask = TCL_WRITABLE;
	}
    }

    if (infoPtr->watchMask & TCL_READABLE) {
	if (WaitForRead(infoPtr, 0) >= 0) {
	    if (infoPtr->readFlags & CONSOLE_EOF) {
		mask = TCL_READABLE;
	    } else {
		mask |= TCL_READABLE;
	    }
	} 
    }

    /*
     * Inform the channel of the events.
     */

    Tcl_NotifyChannel(infoPtr->channel, infoPtr->watchMask & mask);
    return 1;
}

/*