add locking to solve concurreny bug
add locking to solve concurreny bug

joshblum/eeg-spectrogram,joshblum/eeg-spectrogram,joshblum/eeg-toolkit,joshblum/eeg-toolkit,joshblum/eeg-toolkit,joshblum/eeg-toolkit,joshblum/eeg-spectrogram,joshblum/eeg-spectrogram,joshblum/eeg-toolkit,joshblum/eeg-spectrogram