STINNER Victor added the comment:
Extract of Modules/_tracemalloc.c:
static void
set_reentrant(int reentrant)
{
assert(reentrant == 0 || reentrant == 1);
if (reentrant) {
assert(PyThread_get_key_value(tracemalloc_reentrant_key) == NULL);
PyThread_set_key_value(tracemalloc_reentrant_key,
REENTRANT);
}
else {
/* FIXME: PyThread_set_key_value() cannot be used to set the flag
to zero, because it does nothing if the variable has already
a value set. */
PyThread_delete_key_value(tracemalloc_reentrant_key);
}
}
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<http://bugs.python.org/issue19787>
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