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bpo-33895: Relase GIL while calling functions that acquire Windows loader lock (GH-7789)

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LoadLibrary, GetProcAddress, FreeLibrary and GetModuleHandle acquire the system loader lock. Calling these while holding the GIL will cause a deadlock on the rare occasion that another thread is detaching and needs to destroy its thread state at the same time.
This commit is contained in:
Tony Roberts
2019-02-02 18:16:42 +01:00
committed by Steve Dower
parent 2de576e16d
commit 4860f01ac0
8 changed files with 48 additions and 6 deletions
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Python/sysmodule.c
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@@ -1159,7 +1159,9 @@ sys_getwindowsversion_impl(PyObject *module)
// We need to read the version info from a system file resource
// to accurately identify the OS version. If we fail for any reason,
// just return whatever GetVersion said.
Py_BEGIN_ALLOW_THREADS
hKernel32 = GetModuleHandleW(L"kernel32.dll");
Py_END_ALLOW_THREADS
if (hKernel32 && GetModuleFileNameW(hKernel32, kernel32_path, MAX_PATH) &&
(verblock_size = GetFileVersionInfoSizeW(kernel32_path, NULL)) &&
(verblock = PyMem_RawMalloc(verblock_size))) {