gh-81057: Move Threading-Related Globals to _PyRuntimeState (#100084)

https://github.com/python/cpython/issues/81057

1 files changed, 81 insertions, 0 deletions

diff --git a/Include/internal/pycore_pythread.h b/Include/internal/pycore_pythread.h
new file mode 100644
index 0000000..4aeb285
--- /dev/null
+++ b/Include/internal/pycore_pythread.h
@@ -0,0 +1,81 @@
+#ifndef Py_INTERNAL_PYTHREAD_H
+#define Py_INTERNAL_PYTHREAD_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+
+#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
+# ifndef _POSIX_THREADS
+/* Check if we're running on HP-UX and _SC_THREADS is defined. If so, then
+   enough of the Posix threads package is implemented to support python
+   threads.
+
+   This is valid for HP-UX 11.23 running on an ia64 system. If needed, add
+   a check of __ia64 to verify that we're running on an ia64 system instead
+   of a pa-risc system.
+*/
+#  ifdef __hpux
+#   ifdef _SC_THREADS
+#    define _POSIX_THREADS
+#   endif
+#  endif
+# endif /* _POSIX_THREADS */
+#endif /* _POSIX_THREADS */
+
+#if defined(_POSIX_THREADS) && !defined(HAVE_PTHREAD_STUBS)
+# define _USE_PTHREADS
+#endif
+
+#if defined(_USE_PTHREADS) && defined(HAVE_PTHREAD_CONDATTR_SETCLOCK) && defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
+// monotonic is supported statically.  It doesn't mean it works on runtime.
+# define CONDATTR_MONOTONIC
+#endif
+
+
+#if defined(HAVE_PTHREAD_STUBS)
+// pthread_key
+struct py_stub_tls_entry {
+    bool in_use;
+    void *value;
+};
+#endif
+
+struct _pythread_runtime_state {
+    int initialized;
+
+#ifdef _USE_PTHREADS
+    // This matches when thread_pthread.h is used.
+    struct {
+        /* NULL when pthread_condattr_setclock(CLOCK_MONOTONIC) is not supported. */
+        pthread_condattr_t *ptr;
+# ifdef CONDATTR_MONOTONIC
+    /* The value to which condattr_monotonic is set. */
+        pthread_condattr_t val;
+# endif
+    } _condattr_monotonic;
+
+#endif  // USE_PTHREADS
+
+#if defined(HAVE_PTHREAD_STUBS)
+    struct {
+        struct py_stub_tls_entry tls_entries[PTHREAD_KEYS_MAX];
+    } stubs;
+#endif
+};
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_INTERNAL_PYTHREAD_H */