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The C and C++ Include Header Files

/usr/include/python3.12/cpython/pythread.h


$ cat -n /usr/include/python3.12/cpython/pythread.h

     1	#ifndef Py_CPYTHON_PYTHREAD_H
     2	#  error "this header file must not be included directly"
     3	#endif
     4	
     5	#define PYTHREAD_INVALID_THREAD_ID ((unsigned long)-1)
     6	
     7	#ifdef HAVE_FORK
     8	/* Private function to reinitialize a lock at fork in the child process.
     9	   Reset the lock to the unlocked state.
    10	   Return 0 on success, return -1 on error. */
    11	PyAPI_FUNC(int) _PyThread_at_fork_reinit(PyThread_type_lock *lock);
    12	#endif  /* HAVE_FORK */
    13	
    14	#ifdef HAVE_PTHREAD_H
    15	    /* Darwin needs pthread.h to know type name the pthread_key_t. */
    16	#   include <pthread.h>
    17	#   define NATIVE_TSS_KEY_T     pthread_key_t
    18	#elif defined(NT_THREADS)
    19	    /* In Windows, native TSS key type is DWORD,
    20	       but hardcode the unsigned long to avoid errors for include directive.
    21	    */
    22	#   define NATIVE_TSS_KEY_T     unsigned long
    23	#elif defined(HAVE_PTHREAD_STUBS)
    24	#   include "cpython/pthread_stubs.h"
    25	#   define NATIVE_TSS_KEY_T     pthread_key_t
    26	#else
    27	#   error "Require native threads. See https://bugs.python.org/issue31370"
    28	#endif
    29	
    30	/* When Py_LIMITED_API is not defined, the type layout of Py_tss_t is
    31	   exposed to allow static allocation in the API clients.  Even in this case,
    32	   you must handle TSS keys through API functions due to compatibility.
    33	*/
    34	struct _Py_tss_t {
    35	    int _is_initialized;
    36	    NATIVE_TSS_KEY_T _key;
    37	};
    38	
    39	#undef NATIVE_TSS_KEY_T
    40	
    41	/* When static allocation, you must initialize with Py_tss_NEEDS_INIT. */
    42	#define Py_tss_NEEDS_INIT   {0}