Time-varying state space and data store read/write sncyro help

Hey everyone so I am trying to create an adaptive controller which basically semi-real time will identify frequencies and then update the controller. I have a controller block mask with two main subsystems. The error signal comes in and is split to two functions.

Path 1) signal goes into a buffer of 1024 sample (.001 sample rate) and is fed into an FFT which then goes into an embeded function which picks the highest 3 frequencies and calculates the state-space controller matrices. I have the 4 matricies set as global which access the 4 data store memory blocks.

***Path one only needs to execute every 1024 time steps as the buffer block takes that many samples so using a triggered subsystem is correct?

Path 2) goes into a embded function which has 5 inputs (the error signal and 4 data store memory read blocks) which are used to calculate the discrete state space controller output. The states are persistent variables.

What I need help is I am getting errors saying that the second path is trying to access the data store memory before the second path could write to them. How do i instil some persistence and data validity in my controller to make sure the second path doesn't read until first path is written.