fix(setup_helpers): try import multiprocessing.synchronize too (#3043)

79178e71 · jbarlow83 · GitHub · 19d99a87 · 79178e71
Unverified Commit 79178e71 authored Jun 18, 2021 by jbarlow83 Committed by GitHub Jun 18, 2021
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pybind11/setup_helpers.py pybind11/setup_helpers.py +3 -1

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--- a/pybind11/setup_helpers.py
+++ b/pybind11/setup_helpers.py
@@ -410,7 +410,9 @@ class ParallelCompile(object):
                    compiler._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)

            try:
-                import multiprocessing
+                # Importing .synchronize checks for platforms that have some multiprocessing
+                # capabilities but lack semaphores, such as AWS Lambda and Android Termux.
+                import multiprocessing.synchronize
                from multiprocessing.pool import ThreadPool
            except ImportError:
                threads = 1