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| -rw-r--r-- | Doc/library/random.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/library/random.rst b/Doc/library/random.rst index 5a93594..c243ace 100644 --- a/Doc/library/random.rst +++ b/Doc/library/random.rst @@ -319,6 +319,13 @@ be found in any statistics text. deviation. This is slightly faster than the :func:`normalvariate` function defined below. + Multithreading note: When two threads call this function + simultaneously, it is possible that they will receive the + same return value. This can be avoided in three ways. + 1) Have each thread use a different instance of the random + number generator. 2) Put locks around all calls. 3) Use the + slower, but thread-safe :func:`normalvariate` function instead. + .. function:: lognormvariate(mu, sigma) |