chronos/src/main/java/com/redmadrobot/chronos/RunningOperationStorage.java
synchronized final void cancelAll(final boolean mayInterrupt) {
        for (final Integer key : mRunningOperations.keySet()) {
            cancel(key, mayInterrupt, false);
        }

        mRunningOperations.clear();
    }
synchronized final void cancelAll(final boolean mayInterrupt) {
        for (final Integer key : mRunningOperations.keySet()) {
            cancel(key, mayInterrupt, false);
        }

        mRunningOperations.clear();
    }
Cancels all running operations.

@param mayInterrupt {@code true} if threads executing operations task should be interrupted;
otherwise, in-progress tasks are allowed to complete