C++ (Cpp) MessagingArea::CommitCommand Examples

Example #1

File: MessagingService.cpp Project: jessicah/haiku-private

status_t
MessagingService::SendMessage(const void *message, int32 messageSize,
	const messaging_target *targets, int32 targetCount)
{
PRINT(("MessagingService::SendMessage(%p, %ld, %p, %ld)\n", message,
messageSize, targets, targetCount));
	if (!message || messageSize <= 0 || !targets || targetCount <= 0)
		return B_BAD_VALUE;

	int32 dataSize = sizeof(messaging_command_send_message)
		+ targetCount * sizeof(messaging_target) + messageSize;

	// allocate space for the command
	MessagingArea *area;
	void *data;
	bool wasEmpty;
	status_t error = _AllocateCommand(MESSAGING_COMMAND_SEND_MESSAGE, dataSize,
		area, data, wasEmpty);
	if (error != B_OK) {
		PRINT(("MessagingService::SendMessage(): Failed to allocate space for "
			"send message command.\n"));
		return error;
	}
PRINT(("  Allocated space for send message command: area: %p, data: %p, "
"wasEmpty: %d\n", area, data, wasEmpty));

	// prepare the command
	messaging_command_send_message *command
		= (messaging_command_send_message*)data;
	command->message_size = messageSize;
	command->target_count = targetCount;
	memcpy(command->targets, targets, sizeof(messaging_target) * targetCount);
	memcpy((char*)command + (dataSize - messageSize), message, messageSize);

	// shoot
	area->Unlock();
	if (wasEmpty)
		area->CommitCommand();

	return B_OK;
}