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1. A device driver is likely to use hardware interrupts that queue a DFC on a kernel thread for further processing. This kernel thread can preempt the Request() method at any time 2. Several threads (in the process that opened the channel) may use a single instance of the channel concurrently 3. Several concurrent operations may require access to the same hardware and registers. So, in all but the simplest device drivers, it is unlikely that the driver will get away with supporting only one asynchronous operation at a time. Depending on the requirements of the driver, it may be acceptable for the client to issue a second request without having to wait for the rst to complete and the same applies to issuing a synchronous request while an asynchronous request is outstanding. Since the completion of an asynchronous operation occurs in a kernel-side DFC thread, and may preempt any processing that the device driver does in user context, you must take great care to avoid synchronization issues the kernel does not do this for you.

Knowing how to use these methods with a <canvas> tag doesn t ensure that they ll look good. The remainder of this chapter examines most of these methods. You should be well on your way to creating many different shapes by the chapter s end.

Request synchronization Most device drivers are either written to perform all processing within the calling thread context, or to perform all processing within the kernel thread. The former is not generally acceptable for long running tasks, as this effectively blocks the client thread from running. A simple way to provide synchronization of requests in the latter case is to provide a single DFC per request (all posted to the same DFC queue). This scheme provides serialization of requests and guarantees that one operation is not preempted by another operation. However, this may not always be a practical solution as it takes time to queue a DFC and time for it to be scheduled to run. If you are performing a simple request (such as a read from a fast hardware register), this delay may be unacceptable. Device drivers can support a combination of fast synchronous requests (handled in the context of the client thread) and long running asynchronous requests (handled in the context of one or more kernel threads), each of which may require access to the same resources. The kernel provides a set of primitives that should be used when addressing such synchronization issues. First, the kernel provides a set of primitives to allow you to safely perform operations such as increment, decrement, swap or read/modify/write:

270 The best way to start thinking about using the canvas tools for drawing is to visualize all drawings on a grid, just as you did with rectangles. However, given the relative complexity of freeform drawing, even with straight lines, the beginning point is with images on a grid. Figure 13-10 shows two drawings that can be created with straight lines.

TInt NKern::LockedInc(TInt& aCount) TInt NKern::LockedDec(TInt& aCount) TInt NKern::LockedAdd(TInt& aDest, TInt aSrc) TUint32 NKern::LockedSetClear(TUint32& aDest, TUint32 aClearMask,

TUint32 aSetMask) TUint8 NKern::LockedSetClear8(TUint8& aDest, TUint8 aClearMask, TUint8 aSetMask) TInt NKern::SafeInc(TInt& aCount) TInt NKern::SafeDec(TInt& aCount) TAny* NKern::SafeSwap(TAny* aNewValue, TAny*& aPtr) TUint8 NKern::SafeSwap8(TUint8 aNewValue, TUint8& aPtr)

The grid boxes are 20 pixels wide and 20 pixels high. If you take a pencil and a piece of grid paper (or turn on the grid on a drawing program), you can replicate the images in Figure 13-10. Starting with the left image in Figure 13-10, a typical drawing would consist of the following steps:

And of course, for synchronization, the nanokernel s fast semaphores and mutexes are available:

1. Place the pencil at position 40,20 on the grid. To do this with the canvas DOM, use context.beginPath() and context. moveTo(40,20). This is the starting point. 2. Draw a line from the starting point to about 72, 20 for the top of the briefcase handle. Use context.lineTo(72,20) for the canvas equivalent. 3. Move the pencil down to about 72, 38. Use context.lineTo(72,38) for a canvas drawing. 4. Continue in this manner until the outline of the briefcase is complete. 5. When you want to draw the inside of the handle, pick up your pencil, move to where you want to start drawing the inside of the handle. With canvas you use context.moveTo(x,y) to begin in a new position and then use context.lineTo(x,y) to finish up. However, you do not have to reuse context.beginPath(). 6. In a pencil and pen drawing, as soon as your drawing is complete, you have the outline of the briefcase. With canvas, you have to include context.stroke() to add the lines. When you come to the next-to-last point in your drawing, you can use the context. closePath() method to go the point you started, and that is used in the program. The following script (SimpleLineDrawing.html in this chapter s folder at www.wiley. com/go/smashinghtml5) provides all the steps.

void NKern::FSWait(NFastSemaphore* aSem); void NKern::FSSignal(NFastSemaphore* aSem); void NKern::FMWait(NFastMutex* aMutex); void NKern::FMSignal(NFastMutex* aMutex);