This is xnu-11215.1.10. See this file in: 
/*
 *  testthreadcall.h
 *  testkext
 *
 */

#include <IOKit/IOService.h>
#include <IOKit/IOLib.h>

class testthreadcall : public IOService {
	OSDeclareDefaultStructors(testthreadcall);

	virtual bool start( IOService * provider );

public:
	thread_call_t tcall;
	thread_call_t tcall2;
	IOSimpleLock *tlock;
	IOLock       *tlock2;
};