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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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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 10 additions and 13 deletions
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10
Python/thread_nt.h
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@ -292,9 +292,10 @@ PyThread_free_lock(PyThread_type_lock aLock)
FreeNonRecursiveMutex(aLock) ;
}
// WaitForSingleObject() documentation: "The time-out value needs to be a
// positive number between 0 and 0x7FFFFFFF." INFINITE is equal to 0xFFFFFFFF.
const DWORD TIMEOUT_MS_MAX = 0x7FFFFFFF;
// 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.
const DWORD TIMEOUT_MS_MAX = 0xFFFFFFFE;
/*
* Return 1 on success if the lock was acquired
@ -322,12 +323,11 @@ PyThread_acquire_lock_timed(PyThread_type_lock aLock,
// overflow to the caller, so clamp the timeout to
// [0, TIMEOUT_MS_MAX] milliseconds.
//
// TIMEOUT_MS_MAX milliseconds is around 24.9 days.
//
// _thread.Lock.acquire() and _thread.RLock.acquire() raise an
// OverflowError if microseconds is greater than PY_TIMEOUT_MAX.
milliseconds = TIMEOUT_MS_MAX;
}
assert(milliseconds != INFINITE);
}
else {
milliseconds = INFINITE;