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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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12
Include/internal/pycore_condvar.h
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@ -5,18 +5,8 @@
# error "this header requires Py_BUILD_CORE define"
#endif
#ifndef MS_WINDOWS
# include <unistd.h> // _POSIX_THREADS
#endif
#include "pycore_pythread.h" // _POSIX_THREADS
#ifndef _POSIX_THREADS
/* This means pthreads are not implemented in libc headers, hence the macro
not present in unistd.h. But they still can be implemented as an external
library (e.g. gnu pth in pthread emulation) */
# ifdef HAVE_PTHREAD_H
# include <pthread.h> // _POSIX_THREADS
# endif
#endif
#ifdef _POSIX_THREADS
/*