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bpo-41710: Fix PY_TIMEOUT_MAX on Windows (GH-28673)

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WaitForSingleObject() accepts timeout in milliseconds in the range
[0; 0xFFFFFFFE] (DWORD type). INFINITE value (0xFFFFFFFF) means no
timeout. 0xFFFFFFFE milliseconds is around 49.7 days.

PY_TIMEOUT_MAX is (0xFFFFFFFE * 1000) milliseconds on Windows, around
49.7 days.

Partially revert commit 37b8294d62.
This commit is contained in:
Victor Stinner 2021-10-01 13:03:03 +02:00 • committed by GitHub
parent 746d648d47
commit 98d2827002
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3 changed files with 10 additions and 13 deletions
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10
Include/pythread.h
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@ -61,11 +61,11 @@ PyAPI_FUNC(int) _PyThread_at_fork_reinit(PyThread_type_lock *lock);
convert microseconds to nanoseconds. */
# define PY_TIMEOUT_MAX (LLONG_MAX / 1000)
#elif defined (NT_THREADS)
/* In the NT API, the timeout is a DWORD and is expressed in milliseconds,
* a positive number between 0 and 0x7FFFFFFF (see WaitForSingleObject()
* documentation). */
# if 0x7FFFFFFFLL * 1000 < LLONG_MAX
# define PY_TIMEOUT_MAX (0x7FFFFFFFLL * 1000)
// WaitForSingleObject() accepts timeout in milliseconds in the range
// [0; 0xFFFFFFFE] (DWORD type). INFINITE value (0xFFFFFFFF) means no
// timeout. 0xFFFFFFFE milliseconds is around 49.7 days.
# if 0xFFFFFFFELL * 1000 < LLONG_MAX
# define PY_TIMEOUT_MAX (0xFFFFFFFELL * 1000)
# else
# define PY_TIMEOUT_MAX LLONG_MAX
# endif