Synchronize threads.

[TDiego]

Hi forum

Can somebody help me with this 2 questions?

1. Im running an app in the kerner. The grid only uses 1 thread by block, now I need synchronize all threads before perform a new operation. How can I do it?

2. Later the all threads are synchronized I need increases a var (to simulate a clock cycle). How can I handle this var.

my general scheme is this

__global__ void kernel(......)
{
	tid = .....
	
	for (int i=0; i <100000; i++)
	{
		if (tid % 2 == 0)
			//call function1
		else
			//call function 2
		
		
		//here I need increases the var, but only when all threads are synchronized
		clocks++;
		
	}
}

thanks in advanced

[jgonzac]

You can’t syncronize threads of different blocks. The only way to do that is finishing this kernel and launching a new one.
Anyway, in your case, it seems quite hard to syncronize efficiently. Maybe you should think about how to resolve your problem in a parallel way.