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gh-110014: Fix _POSIX_THREADS and _POSIX_SEMAPHORES usage (#110139)

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* pycore_pythread.h is now the central place to make sure that
  _POSIX_THREADS and _POSIX_SEMAPHORES macros are defined if
  available.
* Make sure that pycore_pythread.h is included when _POSIX_THREADS
  and _POSIX_SEMAPHORES macros are tested.
* PY_TIMEOUT_MAX is now defined as a constant, since its value
  depends on _POSIX_THREADS, instead of being defined as a macro.
* Prevent integer overflow in the preprocessor when computing
  PY_TIMEOUT_MAX_VALUE on Windows:
  replace "0xFFFFFFFELL * 1000 < LLONG_MAX"
  with "0xFFFFFFFELL < LLONG_MAX / 1000".
* Document the change and give hints how to fix affected code.
* Add an exception for PY_TIMEOUT_MAX  name to smelly.py
* Add PY_TIMEOUT_MAX to the stable ABI
This commit is contained in:
Victor Stinner 2023-09-30 19:25:54 +02:00 • committed by GitHub
parent f3bb00ea12
commit 74e425ec18
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13 changed files with 72 additions and 57 deletions
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9
Python/thread_pthread.h
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@ -1,4 +1,5 @@
#include "pycore_interp.h" // _PyInterpreterState.threads.stacksize
#include "pycore_interp.h" // _PyInterpreterState.threads.stacksize
#include "pycore_pythread.h" // _POSIX_SEMAPHORES
/* Posix threads interface */
@ -84,10 +85,10 @@
/* On FreeBSD 4.x, _POSIX_SEMAPHORES is defined empty, so
we need to add 0 to make it work there as well. */
#if (_POSIX_SEMAPHORES+0) == -1
#define HAVE_BROKEN_POSIX_SEMAPHORES
# define HAVE_BROKEN_POSIX_SEMAPHORES
#else
#include <semaphore.h>
#include <errno.h>
# include <semaphore.h>
# include <errno.h>
#endif
#endif