public void unpauseTransaction(TXStateProxy tx) {
    internalResume(tx, true);
  }
Activates the specified transaction on the calling thread. Only the same thread that pause the
transaction can unpause it.

@param tx the transaction to be unpaused.
@throws IllegalStateException if this thread already has an active transaction or this thread
        did not pause the transaction.
geode-core/src/main/java/org/apache/geode/internal/cache/TXManagerImpl.java