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-rw-r--r--numpy/random/threefry.pyx10
1 files changed, 10 insertions, 0 deletions
diff --git a/numpy/random/threefry.pyx b/numpy/random/threefry.pyx
index d008cd828..02911528b 100644
--- a/numpy/random/threefry.pyx
+++ b/numpy/random/threefry.pyx
@@ -11,6 +11,8 @@ from .common cimport *
from .distributions cimport bitgen_t
from .entropy import random_entropy, seed_by_array
+__all__ = ['ThreeFry']
+
np.import_array()
DEF THREEFRY_BUFFER_SIZE=4
@@ -74,6 +76,14 @@ cdef class ThreeFry:
a Python int in [0, 2**256) or a 4-element uint64 array.
key and seed cannot both be used.
+ Attributes
+ ----------
+ lock: threading.Lock
+ Lock instance that is shared so that the same bit git generator can
+ be used in multiple Generators without corrupting the state. Code that
+ generates values from a bit generator should hold the bit generator's
+ lock.
+
Notes
-----
ThreeFry is a 64-bit PRNG that uses a counter-based design based on