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【C】自旋锁的实现

作者:ruki / 发布于2014/12/13/ 580

利用了原子锁实现的轻量级的spinlock，适用于一些细粒度的资源竞争保护。。由于不会切到内核态，细粒度锁定的性能会比互斥量高很多。如果是粗粒度的资源保护还是推荐使用mutex。。。


	/*! init spinlock
	*
	* @param lock the lock
	*
	* @return tb_true or tb_false
	*/
	static __tb_inline_force__ tb_bool_t tb_spinlock_init(tb_spinlock_ref_t lock)
	{
	 // check
	 tb_assert_and_check_return_val(lock, tb_false);
	
	 // init
	 *lock = 0;
	
	 // ok
	 return tb_true;
	}
	
	/*! exit spinlock
	*
	* @param lock the lock
	*/
	static __tb_inline_force__ tb_void_t tb_spinlock_exit(tb_spinlock_ref_t lock)
	{
	 // check
	 tb_assert_and_check_return(lock);
	
	 // exit
	 *lock = 0;
	}
	
	/*! enter spinlock
	*
	* @param lock the lock
	*/
	static __tb_inline_force__ tb_void_t tb_spinlock_enter(tb_spinlock_ref_t lock)
	{
	 // check
	 tb_assert_and_check_return(lock);
	
	 // init tryn
	 tb_size_t tryn = 5;
	
	 // lock it
	 while (tb_atomic_fetch_and_pset((tb_atomic_t*)lock, 0, 1))
	 {
	 // yield the processor
	 if (!tryn--)
	 {
	 // yield
	 tb_sched_yield();
	// tb_usleep(1);
	
	 // reset tryn
	 tryn = 5;
	 }
	 }
	}
	
	/*! try to enter spinlock
	*
	* @param lock the lock
	*
	* @return tb_true or tb_false
	*/
	static __tb_inline_force__ tb_bool_t tb_spinlock_enter_try(tb_spinlock_ref_t lock)
	{
	 // check
	 tb_assert_and_check_return_val(lock, tb_false);
	
	 // try locking it
	 return !tb_atomic_fetch_and_pset((tb_atomic_t*)lock, 0, 1);
	}
	
	/*! leave spinlock
	*
	* @param lock the lock
	*/
	static __tb_inline_force__ tb_void_t tb_spinlock_leave(tb_spinlock_ref_t lock)
	{
	 // check
	 tb_assert_and_check_return(lock);
	
	 // leave
	 *((tb_atomic_t*)lock) = 0;
	}

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