kernel/messaging/MessagingService.cpp

55 	MessagingArea *area = new(nothrow) MessagingArea;
56 	if (!area)
59 	// create the area
60 	area->fID = create_area("messaging", (void**)&area->fHeader,
63 	if (area->fID < 0) {
64 		delete area;
69 	area->fSize = kMessagingAreaSize;
70 	area->fLockSem = lockSem;
71 	area->fCounterSem = counterSem;
72 	area->fNextArea = NULL;
73 	area->InitHeader();
75 	return area;
151 	// the area is used as a ring buffer
154 	// the simple case first: the area is empty
222 MessagingArea::SetNextArea(MessagingArea *area)
224 	fNextArea = area;
330 	// create an area
361 		MessagingArea *area = fFirstArea;
362 		fFirstArea = area->NextArea();
363 		delete area;
389 	MessagingArea *area;
393 		area, data, wasEmpty);
399 PRINT(("  Allocated space for send message command: area: %p, data: %p, "
400 "wasEmpty: %d\n", area, data, wasEmpty));
411 	area->Unlock();
413 		area->CommitCommand();
421 	MessagingArea *&area, void *&data, bool &wasEmpty)
434 		area = fFirstArea;
435 		area->Lock();
436 		if (!area->IsEmpty()) {
437 			area->Unlock();
441 		PRINT(("MessagingService::_AllocateCommand(): Discarding area: %p\n",
442 			area));
444 		fFirstArea = area->NextArea();
445 		area->SetNextArea(NULL);
446 		discardedArea = area;
447 		discardedAreaDeleter.SetTo(area);
450 	// allocate space for the command in the last area
451 	area = fLastArea;
452 	area->Lock();
453 	data = area->AllocateCommand(commandWhat, size, wasEmpty);
456 		// not enough space in the last area: create a new area or reuse a
459 			area = discardedAreaDeleter.Detach();
460 			area->InitHeader();
462 				"left in current area. Recycling discarded one: %p\n", area));
464 			area = MessagingArea::Create(fLockSem, fCounterSem);
466 				"left in current area. Allocated new one: %p\n", area));
468 		if (!area) {
473 		// add the new area
474 		fLastArea->SetNextArea(area);
476 		fLastArea = area;
479 		data = area->AllocateCommand(commandWhat, size, wasEmpty);
483 			area->Unlock();
557 		   command into an empty area. Semaphore counter must be initialized
560 	- The ID of the kernel area used for communication, if everything went fine,