80 	byte	*Head;		/* first message in queue (if any)	*/  member
98 	Q->Base = Q->Head = Q->Tail = Buffer;  in queueInit()
116 	if (Q->Tail == Q->Head) {  in queueAllocMsg()
123 	if (Q->Tail > Q->Head) {  in queueAllocMsg()
125 		if (Q->Base + need > Q->Head) {  in queueAllocMsg()
134 	if (Q->Tail + need > Q->Head) {  in queueAllocMsg()
154 	word size = ((MSG_HEAD *)Q->Head)->Size & ~MSG_INCOMPLETE;  in queueFreeMsg()
156 	Q->Head  += MSG_NEED(size);  in queueFreeMsg()
160 		if (Q->Head >= Q->Wrap) {  in queueFreeMsg()
161 			Q->Head = Q->Base;  in queueFreeMsg()
164 	} else if (Q->Head >= Q->Tail) {  in queueFreeMsg()
165 		Q->Head = Q->Tail = Q->Base;  in queueFreeMsg()
174 	MSG_HEAD *Msg = (MSG_HEAD *)Q->Head;  in queuePeekMsg()