[frontend] Implement waitForSync by disconnect/connect.

cs136 / seashell

Seashell is an online environment for editing, running, and submitting C programming assignments.

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[frontend] Implement waitForSync by disconnect/connect. #772

Closed e45lee closed 7 years ago

e45lee commented 7 years ago

This PR implements waitForSync by calling disconnect/connect, avoiding the possible race condition that could occur when a write was expected and synced before waitForSync could check.