Each of these manipulators takes a single argument, operates on it
  as described, and returns it.

1 - lock(Mutex &)

  Locks a recursive mutex

2 - resetiosflags(long)

  Clears, in the stream  (istream or ostream), the format bits
  denoted by the argument.

3 - setfill(int)

  Sets the fill character (istream or ostream) to be the value
  specified by the argument.

4 - setiosflags(long)

  Turns on, in the stream  (istream or ostream), the format bits
  denoted by the argument.

5 - setprecision(int)

  Sets the precision (istream or ostream) to be the value specified
  by the argument.

6 - setw(int w)

  Sets the field width of the stream (left-hand operand: ostream
  or istream) to the value specified by the argument.

7 - unlock(Mutex &)

  unlocks a recursive mutex