closes bpo-31903: Release the GIL when calling into SystemConfigurati…

…on (GH-4178) (cherry picked from commit 4859ba0) Co-authored-by: Max Bélanger <aeromax@gmail.com>
python · Sep 12, 2018 · 72c34cf · 72c34cf
1 parent cadb66e
commit 72c34cf
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diff --git a/Misc/NEWS.d/next/macOS/2017-11-01-16-53-12.bpo-31903.K6jCVG.rst b/Misc/NEWS.d/next/macOS/2017-11-01-16-53-12.bpo-31903.K6jCVG.rst
@@ -0,0 +1,2 @@
+In :mod:`_scproxy`, drop the GIL when calling into ``SystemConfiguration`` to avoid
+deadlocks.
diff --git a/Modules/_scproxy.c b/Modules/_scproxy.c
@@ -62,7 +62,10 @@ get_proxy_settings(PyObject* mod __attribute__((__unused__)))
     PyObject* v;
     int r;
 
+    Py_BEGIN_ALLOW_THREADS
     proxyDict = SCDynamicStoreCopyProxies(NULL);
+    Py_END_ALLOW_THREADS
+
     if (!proxyDict) {
         Py_RETURN_NONE;
     }
@@ -172,7 +175,10 @@ get_proxies(PyObject* mod __attribute__((__unused__)))
     int r;
     CFDictionaryRef proxyDict = NULL;
 
+    Py_BEGIN_ALLOW_THREADS
     proxyDict = SCDynamicStoreCopyProxies(NULL);
+    Py_END_ALLOW_THREADS
+
     if (proxyDict == NULL) {
         return PyDict_New();
     }