8000 [3.10] bpo-41710: Fix PY_TIMEOUT_MAX value on Windows by vstinner · Pull Request #28672 · python/cpython · GitHub
[go: up one dir, main page]
Skip to content

[3.10] bpo-41710: Fix PY_TIMEOUT_MAX 8000 value on Windows #28672

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

[3.10] bpo-41710: Fix PY_TIMEOUT_MAX value on Windows #28672

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 5 additions & 3 deletions Include/pythread.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -61,9 +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 */
# if 0xFFFFFFFFLL * 1000 < LLONG_MAX
# define PY_TIMEOUT_MAX (0xFFFFFFFFLL * 1000)
/* 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)
# else
# define PY_TIMEOUT_MAX LLONG_MAX
# endif
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2021-09-30-08-57-50.bpo-41710.JMsPAW.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix :data:`_thread.TIMEOUT_MAX` value on Windows: the maximum timeout is
0x7FFFFFFF milliseconds (around 24.9 days), not 0xFFFFFFFF milliseconds (around
49.7 days).
12 changes: 9 additions & 3 deletions Python/thread_nt.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -295,6 +295,10 @@ 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;

/*
* Return 1 on success if the lock was acquired
*
Expand All @@ -312,9 +316,11 @@ PyThread_acquire_lock_timed(PyThread_type_lock aLock,

if (microseconds >= 0) {
milliseconds = microseconds / 1000;
if (microseconds % 1000 > 0)
++milliseconds;
if (milliseconds > PY_DWORD_MAX) {
// Round milliseconds away from zero
if (microseconds % 1000 > 0) {
milliseconds++;
}
if (milliseconds > (PY_TIMEOUT_T)TIMEOUT_MS_MAX) {
Py_FatalError("Timeout larger than PY_TIMEOUT_MAX");
}
}
Expand Down
0