A macro for automatically locking and unlocking critical sections of code with OSSpinLocks.

critical_section.h

/**
 * Usage: 
 *
 * static OSSpinlock lock;
 *
 * @critical_section(lock, ^{
 *	//Synchronized Section  
 * });
 *
 */

static inline void __nui_cleanup(volatile OSSpinLock **lock) {
	OSSpinLockUnlock(*lock);
}

#ifndef critical_section
	#define critical_section(LOCK, BLOCK) \
		autoreleasepool {} \
		do {\
			volatile OSSpinLock *__nui_local_lock __attribute__ ((__cleanup__(__nui_cleanup))) = &LOCK; \
			OSSpinLockLock(__nui_local_lock); \
			BLOCK(); \
		} while (0)
#endif