Sync contrib/tools/python3 layout with upstream

* Move src/ subdir contents to the top of the layout
* Rename self-written lib -> lib2 to avoid CaseFolding warning from the VCS
* Regenerate contrib/libs/python proxy-headers accordingly
4ccc62ac1511abcf0fed14ccade38e984e088f1e

1 files changed, 921 insertions, 0 deletions

diff --git a/contrib/tools/python3/Python/thread_pthread.h b/contrib/tools/python3/Python/thread_pthread.h
new file mode 100644
index 0000000000..e5535a945e
--- /dev/null
+++ b/contrib/tools/python3/Python/thread_pthread.h
@@ -0,0 +1,921 @@
+#include "pycore_interp.h"    // _PyInterpreterState.threads.stacksize
+
+/* Posix threads interface */
+
+#include <stdlib.h>
+#include <string.h>
+#if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
+#define destructor xxdestructor
+#endif
+#ifndef HAVE_PTHREAD_STUBS
+#  include <pthread.h>
+#endif
+#if defined(__APPLE__) || defined(HAVE_PTHREAD_DESTRUCTOR)
+#undef destructor
+#endif
+#include <signal.h>
+
+#if defined(__linux__)
+#   include <sys/syscall.h>     /* syscall(SYS_gettid) */
+#elif defined(__FreeBSD__)
+#   include <pthread_np.h>      /* pthread_getthreadid_np() */
+#elif defined(__OpenBSD__)
+#   include <unistd.h>          /* getthrid() */
+#elif defined(_AIX)
+#   include <sys/thread.h>      /* thread_self() */
+#elif defined(__NetBSD__)
+#   include <lwp.h>             /* _lwp_self() */
+#elif defined(__DragonFly__)
+#   error #include <sys/lwp.h>         /* lwp_gettid() */
+#endif
+
+/* The POSIX spec requires that use of pthread_attr_setstacksize
+   be conditional on _POSIX_THREAD_ATTR_STACKSIZE being defined. */
+#ifdef _POSIX_THREAD_ATTR_STACKSIZE
+#ifndef THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE       0       /* use default stack size */
+#endif
+
+/* The default stack size for new threads on BSD is small enough that
+ * we'll get hard crashes instead of 'maximum recursion depth exceeded'
+ * exceptions.
+ *
+ * The default stack size below is the empirically determined minimal stack
+ * sizes where a simple recursive function doesn't cause a hard crash.
+ *
+ * For macOS the value of THREAD_STACK_SIZE is determined in configure.ac
+ * as it also depends on the other configure options like chosen sanitizer
+ * runtimes.
+ */
+#if defined(__FreeBSD__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#undef  THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE       0x400000
+#endif
+#if defined(_AIX) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#undef  THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE       0x200000
+#endif
+/* bpo-38852: test_threading.test_recursion_limit() checks that 1000 recursive
+   Python calls (default recursion limit) doesn't crash, but raise a regular
+   RecursionError exception. In debug mode, Python function calls allocates
+   more memory on the stack, so use a stack of 8 MiB. */
+#if defined(__ANDROID__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#   ifdef Py_DEBUG
+#   undef  THREAD_STACK_SIZE
+#   define THREAD_STACK_SIZE    0x800000
+#   endif
+#endif
+#if defined(__VXWORKS__) && defined(THREAD_STACK_SIZE) && THREAD_STACK_SIZE == 0
+#undef  THREAD_STACK_SIZE
+#define THREAD_STACK_SIZE       0x100000
+#endif
+/* for safety, ensure a viable minimum stacksize */
+#define THREAD_STACK_MIN        0x8000  /* 32 KiB */
+#else  /* !_POSIX_THREAD_ATTR_STACKSIZE */
+#ifdef THREAD_STACK_SIZE
+#error "THREAD_STACK_SIZE defined but _POSIX_THREAD_ATTR_STACKSIZE undefined"
+#endif
+#endif
+
+/* The POSIX spec says that implementations supporting the sem_*
+   family of functions must indicate this by defining
+   _POSIX_SEMAPHORES. */
+#ifdef _POSIX_SEMAPHORES
+/* 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
+#else
+#include <semaphore.h>
+#include <errno.h>
+#endif
+#endif
+
+
+/* Whether or not to use semaphores directly rather than emulating them with
+ * mutexes and condition variables:
+ */
+#if (defined(_POSIX_SEMAPHORES) && !defined(HAVE_BROKEN_POSIX_SEMAPHORES) && \
+     (defined(HAVE_SEM_TIMEDWAIT) || defined(HAVE_SEM_CLOCKWAIT)))
+#  define USE_SEMAPHORES
+#else
+#  undef USE_SEMAPHORES
+#endif
+
+
+/* On platforms that don't use standard POSIX threads pthread_sigmask()
+ * isn't present.  DEC threads uses sigprocmask() instead as do most
+ * other UNIX International compliant systems that don't have the full
+ * pthread implementation.
+ */
+#if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
+#  define SET_THREAD_SIGMASK pthread_sigmask
+#else
+#  define SET_THREAD_SIGMASK sigprocmask
+#endif
+
+
+/*
+ * pthread_cond support
+ */
+
+#define condattr_monotonic _PyRuntime.threads._condattr_monotonic.ptr
+
+static void
+init_condattr(void)
+{
+#ifdef CONDATTR_MONOTONIC
+# define ca _PyRuntime.threads._condattr_monotonic.val
+    // XXX We need to check the return code?
+    pthread_condattr_init(&ca);
+    // XXX We need to run pthread_condattr_destroy() during runtime fini.
+    if (pthread_condattr_setclock(&ca, CLOCK_MONOTONIC) == 0) {
+        condattr_monotonic = &ca;  // Use monotonic clock
+    }
+# undef ca
+#endif  // CONDATTR_MONOTONIC
+}
+
+int
+_PyThread_cond_init(PyCOND_T *cond)
+{
+    return pthread_cond_init(cond, condattr_monotonic);
+}
+
+
+void
+_PyThread_cond_after(long long us, struct timespec *abs)
+{
+    _PyTime_t timeout = _PyTime_FromMicrosecondsClamp(us);
+    _PyTime_t t;
+#ifdef CONDATTR_MONOTONIC
+    if (condattr_monotonic) {
+        t = _PyTime_GetMonotonicClock();
+    }
+    else
+#endif
+    {
+        t = _PyTime_GetSystemClock();
+    }
+    t = _PyTime_Add(t, timeout);
+    _PyTime_AsTimespec_clamp(t, abs);
+}
+
+
+/* A pthread mutex isn't sufficient to model the Python lock type
+ * because, according to Draft 5 of the docs (P1003.4a/D5), both of the
+ * following are undefined:
+ *  -> a thread tries to lock a mutex it already has locked
+ *  -> a thread tries to unlock a mutex locked by a different thread
+ * pthread mutexes are designed for serializing threads over short pieces
+ * of code anyway, so wouldn't be an appropriate implementation of
+ * Python's locks regardless.
+ *
+ * The pthread_lock struct implements a Python lock as a "locked?" bit
+ * and a <condition, mutex> pair.  In general, if the bit can be acquired
+ * instantly, it is, else the pair is used to block the thread until the
+ * bit is cleared.     9 May 1994 tim@ksr.com
+ */
+
+typedef struct {
+    char             locked; /* 0=unlocked, 1=locked */
+    /* a <cond, mutex> pair to handle an acquire of a locked lock */
+    pthread_cond_t   lock_released;
+    pthread_mutex_t  mut;
+} pthread_lock;
+
+#define CHECK_STATUS(name)  if (status != 0) { perror(name); error = 1; }
+#define CHECK_STATUS_PTHREAD(name)  if (status != 0) { fprintf(stderr, \
+    "%s: %s\n", name, strerror(status)); error = 1; }
+
+/*
+ * Initialization for the current runtime.
+ */
+static void
+PyThread__init_thread(void)
+{
+    // The library is only initialized once in the process,
+    // regardless of how many times the Python runtime is initialized.
+    static int lib_initialized = 0;
+    if (!lib_initialized) {
+        lib_initialized = 1;
+#if defined(_AIX) && defined(__GNUC__)
+        extern void pthread_init(void);
+        pthread_init();
+#endif
+    }
+    init_condattr();
+}
+
+/*
+ * Thread support.
+ */
+
+/* bpo-33015: pythread_callback struct and pythread_wrapper() cast
+   "void func(void *)" to "void* func(void *)": always return NULL.
+
+   PyThread_start_new_thread() uses "void func(void *)" type, whereas
+   pthread_create() requires a void* return value. */
+typedef struct {
+    void (*func) (void *);
+    void *arg;
+} pythread_callback;
+
+static void *
+pythread_wrapper(void *arg)
+{
+    /* copy func and func_arg and free the temporary structure */
+    pythread_callback *callback = arg;
+    void (*func)(void *) = callback->func;
+    void *func_arg = callback->arg;
+    PyMem_RawFree(arg);
+
+    func(func_arg);
+    return NULL;
+}
+
+unsigned long
+PyThread_start_new_thread(void (*func)(void *), void *arg)
+{
+    pthread_t th;
+    int status;
+#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+    pthread_attr_t attrs;
+#endif
+#if defined(THREAD_STACK_SIZE)
+    size_t      tss;
+#endif
+
+    if (!initialized)
+        PyThread_init_thread();
+
+#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+    if (pthread_attr_init(&attrs) != 0)
+        return PYTHREAD_INVALID_THREAD_ID;
+#endif
+#if defined(THREAD_STACK_SIZE)
+    PyThreadState *tstate = _PyThreadState_GET();
+    size_t stacksize = tstate ? tstate->interp->threads.stacksize : 0;
+    tss = (stacksize != 0) ? stacksize : THREAD_STACK_SIZE;
+    if (tss != 0) {
+        if (pthread_attr_setstacksize(&attrs, tss) != 0) {
+            pthread_attr_destroy(&attrs);
+            return PYTHREAD_INVALID_THREAD_ID;
+        }
+    }
+#endif
+#if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+    pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
+#endif
+
+    pythread_callback *callback = PyMem_RawMalloc(sizeof(pythread_callback));
+
+    if (callback == NULL) {
+      return PYTHREAD_INVALID_THREAD_ID;
+    }
+
+    callback->func = func;
+    callback->arg = arg;
+
+    status = pthread_create(&th,
+#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+                             &attrs,
+#else
+                             (pthread_attr_t*)NULL,
+#endif
+                             pythread_wrapper, callback);
+
+#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+    pthread_attr_destroy(&attrs);
+#endif
+
+    if (status != 0) {
+        PyMem_RawFree(callback);
+        return PYTHREAD_INVALID_THREAD_ID;
+    }
+
+    pthread_detach(th);
+
+#if SIZEOF_PTHREAD_T <= SIZEOF_LONG
+    return (unsigned long) th;
+#else
+    return (unsigned long) *(unsigned long *) &th;
+#endif
+}
+
+/* XXX This implementation is considered (to quote Tim Peters) "inherently
+   hosed" because:
+     - It does not guarantee the promise that a non-zero integer is returned.
+     - The cast to unsigned long is inherently unsafe.
+     - It is not clear that the 'volatile' (for AIX?) are any longer necessary.
+*/
+unsigned long
+PyThread_get_thread_ident(void)
+{
+    volatile pthread_t threadid;
+    if (!initialized)
+        PyThread_init_thread();
+    threadid = pthread_self();
+    return (unsigned long) threadid;
+}
+
+#ifdef PY_HAVE_THREAD_NATIVE_ID
+unsigned long
+PyThread_get_thread_native_id(void)
+{
+    if (!initialized)
+        PyThread_init_thread();
+#ifdef __APPLE__
+    uint64_t native_id;
+    (void) pthread_threadid_np(NULL, &native_id);
+#elif defined(__linux__)
+    pid_t native_id;
+    native_id = syscall(SYS_gettid);
+#elif defined(__FreeBSD__)
+    int native_id;
+    native_id = pthread_getthreadid_np();
+#elif defined(__OpenBSD__)
+    pid_t native_id;
+    native_id = getthrid();
+#elif defined(_AIX)
+    tid_t native_id;
+    native_id = thread_self();
+#elif defined(__NetBSD__)
+    lwpid_t native_id;
+    native_id = _lwp_self();
+#elif defined(__DragonFly__)
+    lwpid_t native_id;
+    native_id = lwp_gettid();
+#endif
+    return (unsigned long) native_id;
+}
+#endif
+
+void _Py_NO_RETURN
+PyThread_exit_thread(void)
+{
+    if (!initialized)
+        exit(0);
+#if defined(__wasi__)
+    /*
+     * wasi-threads doesn't have pthread_exit right now
+     * cf. https://github.com/WebAssembly/wasi-threads/issues/7
+     */
+    abort();
+#else
+    pthread_exit(0);
+#endif
+}
+
+#ifdef USE_SEMAPHORES
+
+/*
+ * Lock support.
+ */
+
+PyThread_type_lock
+PyThread_allocate_lock(void)
+{
+    sem_t *lock;
+    int status, error = 0;
+
+    if (!initialized)
+        PyThread_init_thread();
+
+    lock = (sem_t *)PyMem_RawMalloc(sizeof(sem_t));
+
+    if (lock) {
+        status = sem_init(lock,0,1);
+        CHECK_STATUS("sem_init");
+
+        if (error) {
+            PyMem_RawFree((void *)lock);
+            lock = NULL;
+        }
+    }
+
+    return (PyThread_type_lock)lock;
+}
+
+void
+PyThread_free_lock(PyThread_type_lock lock)
+{
+    sem_t *thelock = (sem_t *)lock;
+    int status, error = 0;
+
+    (void) error; /* silence unused-but-set-variable warning */
+
+    if (!thelock)
+        return;
+
+    status = sem_destroy(thelock);
+    CHECK_STATUS("sem_destroy");
+
+    PyMem_RawFree((void *)thelock);
+}
+
+/*
+ * As of February 2002, Cygwin thread implementations mistakenly report error
+ * codes in the return value of the sem_ calls (like the pthread_ functions).
+ * Correct implementations return -1 and put the code in errno. This supports
+ * either.
+ */
+static int
+fix_status(int status)
+{
+    return (status == -1) ? errno : status;
+}
+
+PyLockStatus
+PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
+                            int intr_flag)
+{
+    PyLockStatus success;
+    sem_t *thelock = (sem_t *)lock;
+    int status, error = 0;
+
+    (void) error; /* silence unused-but-set-variable warning */
+
+    _PyTime_t timeout;  // relative timeout
+    if (microseconds >= 0) {
+        // bpo-41710: PyThread_acquire_lock_timed() cannot report timeout
+        // overflow to the caller, so clamp the timeout to
+        // [_PyTime_MIN, _PyTime_MAX].
+        //
+        // _PyTime_MAX nanoseconds is around 292.3 years.
+        //
+        // _thread.Lock.acquire() and _thread.RLock.acquire() raise an
+        // OverflowError if microseconds is greater than PY_TIMEOUT_MAX.
+        timeout = _PyTime_FromMicrosecondsClamp(microseconds);
+    }
+    else {
+        timeout = _PyTime_FromNanoseconds(-1);
+    }
+
+#ifdef HAVE_SEM_CLOCKWAIT
+    struct timespec abs_timeout;
+    // Local scope for deadline
+    {
+        _PyTime_t deadline = _PyTime_Add(_PyTime_GetMonotonicClock(), timeout);
+        _PyTime_AsTimespec_clamp(deadline, &abs_timeout);
+    }
+#else
+    _PyTime_t deadline = 0;
+    if (timeout > 0 && !intr_flag) {
+        deadline = _PyDeadline_Init(timeout);
+    }
+#endif
+
+    while (1) {
+        if (timeout > 0) {
+#ifdef HAVE_SEM_CLOCKWAIT
+            status = fix_status(sem_clockwait(thelock, CLOCK_MONOTONIC,
+                                              &abs_timeout));
+#else
+            _PyTime_t abs_time = _PyTime_Add(_PyTime_GetSystemClock(),
+                                             timeout);
+            struct timespec ts;
+            _PyTime_AsTimespec_clamp(abs_time, &ts);
+            status = fix_status(sem_timedwait(thelock, &ts));
+#endif
+        }
+        else if (timeout == 0) {
+            status = fix_status(sem_trywait(thelock));
+        }
+        else {
+            status = fix_status(sem_wait(thelock));
+        }
+
+        /* Retry if interrupted by a signal, unless the caller wants to be
+           notified.  */
+        if (intr_flag || status != EINTR) {
+            break;
+        }
+
+        // sem_clockwait() uses an absolute timeout, there is no need
+        // to recompute the relative timeout.
+#ifndef HAVE_SEM_CLOCKWAIT
+        if (timeout > 0) {
+            /* wait interrupted by a signal (EINTR): recompute the timeout */
+            timeout = _PyDeadline_Get(deadline);
+            if (timeout < 0) {
+                status = ETIMEDOUT;
+                break;
+            }
+        }
+#endif
+    }
+
+    /* Don't check the status if we're stopping because of an interrupt.  */
+    if (!(intr_flag && status == EINTR)) {
+        if (timeout > 0) {
+            if (status != ETIMEDOUT) {
+#ifdef HAVE_SEM_CLOCKWAIT
+                CHECK_STATUS("sem_clockwait");
+#else
+                CHECK_STATUS("sem_timedwait");
+#endif
+            }
+        }
+        else if (timeout == 0) {
+            if (status != EAGAIN) {
+                CHECK_STATUS("sem_trywait");
+            }
+        }
+        else {
+            CHECK_STATUS("sem_wait");
+        }
+    }
+
+    if (status == 0) {
+        success = PY_LOCK_ACQUIRED;
+    } else if (intr_flag && status == EINTR) {
+        success = PY_LOCK_INTR;
+    } else {
+        success = PY_LOCK_FAILURE;
+    }
+
+    return success;
+}
+
+void
+PyThread_release_lock(PyThread_type_lock lock)
+{
+    sem_t *thelock = (sem_t *)lock;
+    int status, error = 0;
+
+    (void) error; /* silence unused-but-set-variable warning */
+
+    status = sem_post(thelock);
+    CHECK_STATUS("sem_post");
+}
+
+#else /* USE_SEMAPHORES */
+
+/*
+ * Lock support.
+ */
+PyThread_type_lock
+PyThread_allocate_lock(void)
+{
+    pthread_lock *lock;
+    int status, error = 0;
+
+    if (!initialized)
+        PyThread_init_thread();
+
+    lock = (pthread_lock *) PyMem_RawCalloc(1, sizeof(pthread_lock));
+    if (lock) {
+        lock->locked = 0;
+
+        status = pthread_mutex_init(&lock->mut, NULL);
+        CHECK_STATUS_PTHREAD("pthread_mutex_init");
+        /* Mark the pthread mutex underlying a Python mutex as
+           pure happens-before.  We can't simply mark the
+           Python-level mutex as a mutex because it can be
+           acquired and released in different threads, which
+           will cause errors. */
+        _Py_ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(&lock->mut);
+
+        status = _PyThread_cond_init(&lock->lock_released);
+        CHECK_STATUS_PTHREAD("pthread_cond_init");
+
+        if (error) {
+            PyMem_RawFree((void *)lock);
+            lock = 0;
+        }
+    }
+
+    return (PyThread_type_lock) lock;
+}
+
+void
+PyThread_free_lock(PyThread_type_lock lock)
+{
+    pthread_lock *thelock = (pthread_lock *)lock;
+    int status, error = 0;
+
+    (void) error; /* silence unused-but-set-variable warning */
+
+    /* some pthread-like implementations tie the mutex to the cond
+     * and must have the cond destroyed first.
+     */
+    status = pthread_cond_destroy( &thelock->lock_released );
+    CHECK_STATUS_PTHREAD("pthread_cond_destroy");
+
+    status = pthread_mutex_destroy( &thelock->mut );
+    CHECK_STATUS_PTHREAD("pthread_mutex_destroy");
+
+    PyMem_RawFree((void *)thelock);
+}
+
+PyLockStatus
+PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,
+                            int intr_flag)
+{
+    PyLockStatus success = PY_LOCK_FAILURE;
+    pthread_lock *thelock = (pthread_lock *)lock;
+    int status, error = 0;
+
+    if (microseconds == 0) {
+        status = pthread_mutex_trylock( &thelock->mut );
+        if (status != EBUSY) {
+            CHECK_STATUS_PTHREAD("pthread_mutex_trylock[1]");
+        }
+    }
+    else {
+        status = pthread_mutex_lock( &thelock->mut );
+        CHECK_STATUS_PTHREAD("pthread_mutex_lock[1]");
+    }
+    if (status != 0) {
+        goto done;
+    }
+
+    if (thelock->locked == 0) {
+        success = PY_LOCK_ACQUIRED;
+        goto unlock;
+    }
+    if (microseconds == 0) {
+        goto unlock;
+    }
+
+    struct timespec abs_timeout;
+    if (microseconds > 0) {
+        _PyThread_cond_after(microseconds, &abs_timeout);
+    }
+    // Continue trying until we get the lock
+
+    // mut must be locked by me -- part of the condition protocol
+    while (1) {
+        if (microseconds > 0) {
+            status = pthread_cond_timedwait(&thelock->lock_released,
+                                            &thelock->mut, &abs_timeout);
+            if (status == 1) {
+                break;
+            }
+            if (status == ETIMEDOUT) {
+                break;
+            }
+            CHECK_STATUS_PTHREAD("pthread_cond_timedwait");
+        }
+        else {
+            status = pthread_cond_wait(
+                &thelock->lock_released,
+                &thelock->mut);
+            CHECK_STATUS_PTHREAD("pthread_cond_wait");
+        }
+
+        if (intr_flag && status == 0 && thelock->locked) {
+            // We were woken up, but didn't get the lock.  We probably received
+            // a signal.  Return PY_LOCK_INTR to allow the caller to handle
+            // it and retry.
+            success = PY_LOCK_INTR;
+            break;
+        }
+
+        if (status == 0 && !thelock->locked) {
+            success = PY_LOCK_ACQUIRED;
+            break;
+        }
+
+        // Wait got interrupted by a signal: retry
+    }
+
+unlock:
+    if (success == PY_LOCK_ACQUIRED) {
+        thelock->locked = 1;
+    }
+    status = pthread_mutex_unlock( &thelock->mut );
+    CHECK_STATUS_PTHREAD("pthread_mutex_unlock[1]");
+
+done:
+    if (error) {
+        success = PY_LOCK_FAILURE;
+    }
+    return success;
+}
+
+void
+PyThread_release_lock(PyThread_type_lock lock)
+{
+    pthread_lock *thelock = (pthread_lock *)lock;
+    int status, error = 0;
+
+    (void) error; /* silence unused-but-set-variable warning */
+
+    status = pthread_mutex_lock( &thelock->mut );
+    CHECK_STATUS_PTHREAD("pthread_mutex_lock[3]");
+
+    thelock->locked = 0;
+
+    /* wake up someone (anyone, if any) waiting on the lock */
+    status = pthread_cond_signal( &thelock->lock_released );
+    CHECK_STATUS_PTHREAD("pthread_cond_signal");
+
+    status = pthread_mutex_unlock( &thelock->mut );
+    CHECK_STATUS_PTHREAD("pthread_mutex_unlock[3]");
+}
+
+#endif /* USE_SEMAPHORES */
+
+int
+_PyThread_at_fork_reinit(PyThread_type_lock *lock)
+{
+    PyThread_type_lock new_lock = PyThread_allocate_lock();
+    if (new_lock == NULL) {
+        return -1;
+    }
+
+    /* bpo-6721, bpo-40089: The old lock can be in an inconsistent state.
+       fork() can be called in the middle of an operation on the lock done by
+       another thread. So don't call PyThread_free_lock(*lock).
+
+       Leak memory on purpose. Don't release the memory either since the
+       address of a mutex is relevant. Putting two mutexes at the same address
+       can lead to problems. */
+
+    *lock = new_lock;
+    return 0;
+}
+
+int
+PyThread_acquire_lock(PyThread_type_lock lock, int waitflag)
+{
+    return PyThread_acquire_lock_timed(lock, waitflag ? -1 : 0, /*intr_flag=*/0);
+}
+
+/* set the thread stack size.
+ * Return 0 if size is valid, -1 if size is invalid,
+ * -2 if setting stack size is not supported.
+ */
+static int
+_pythread_pthread_set_stacksize(size_t size)
+{
+#if defined(THREAD_STACK_SIZE)
+    pthread_attr_t attrs;
+    size_t tss_min;
+    int rc = 0;
+#endif
+
+    /* set to default */
+    if (size == 0) {
+        _PyInterpreterState_GET()->threads.stacksize = 0;
+        return 0;
+    }
+
+#if defined(THREAD_STACK_SIZE)
+#if defined(PTHREAD_STACK_MIN)
+    tss_min = PTHREAD_STACK_MIN > THREAD_STACK_MIN ? PTHREAD_STACK_MIN
+                                                   : THREAD_STACK_MIN;
+#else
+    tss_min = THREAD_STACK_MIN;
+#endif
+    if (size >= tss_min) {
+        /* validate stack size by setting thread attribute */
+        if (pthread_attr_init(&attrs) == 0) {
+            rc = pthread_attr_setstacksize(&attrs, size);
+            pthread_attr_destroy(&attrs);
+            if (rc == 0) {
+                _PyInterpreterState_GET()->threads.stacksize = size;
+                return 0;
+            }
+        }
+    }
+    return -1;
+#else
+    return -2;
+#endif
+}
+
+#define THREAD_SET_STACKSIZE(x) _pythread_pthread_set_stacksize(x)
+
+
+/* Thread Local Storage (TLS) API
+
+   This API is DEPRECATED since Python 3.7.  See PEP 539 for details.
+*/
+
+/* Issue #25658: On platforms where native TLS key is defined in a way that
+   cannot be safely cast to int, PyThread_create_key returns immediately a
+   failure status and other TLS functions all are no-ops.  This indicates
+   clearly that the old API is not supported on platforms where it cannot be
+   used reliably, and that no effort will be made to add such support.
+
+   Note: PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT will be unnecessary after
+   removing this API.
+*/
+
+int
+PyThread_create_key(void)
+{
+#ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+    pthread_key_t key;
+    int fail = pthread_key_create(&key, NULL);
+    if (fail)
+        return -1;
+    if (key > INT_MAX) {
+        /* Issue #22206: handle integer overflow */
+        pthread_key_delete(key);
+        errno = ENOMEM;
+        return -1;
+    }
+    return (int)key;
+#else
+    return -1;  /* never return valid key value. */
+#endif
+}
+
+void
+PyThread_delete_key(int key)
+{
+#ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+    pthread_key_delete(key);
+#endif
+}
+
+void
+PyThread_delete_key_value(int key)
+{
+#ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+    pthread_setspecific(key, NULL);
+#endif
+}
+
+int
+PyThread_set_key_value(int key, void *value)
+{
+#ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+    int fail = pthread_setspecific(key, value);
+    return fail ? -1 : 0;
+#else
+    return -1;
+#endif
+}
+
+void *
+PyThread_get_key_value(int key)
+{
+#ifdef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT
+    return pthread_getspecific(key);
+#else
+    return NULL;
+#endif
+}
+
+
+void
+PyThread_ReInitTLS(void)
+{
+}
+
+
+/* Thread Specific Storage (TSS) API
+
+   Platform-specific components of TSS API implementation.
+*/
+
+int
+PyThread_tss_create(Py_tss_t *key)
+{
+    assert(key != NULL);
+    /* If the key has been created, function is silently skipped. */
+    if (key->_is_initialized) {
+        return 0;
+    }
+
+    int fail = pthread_key_create(&(key->_key), NULL);
+    if (fail) {
+        return -1;
+    }
+    key->_is_initialized = 1;
+    return 0;
+}
+
+void
+PyThread_tss_delete(Py_tss_t *key)
+{
+    assert(key != NULL);
+    /* If the key has not been created, function is silently skipped. */
+    if (!key->_is_initialized) {
+        return;
+    }
+
+    pthread_key_delete(key->_key);
+    /* pthread has not provided the defined invalid value for the key. */
+    key->_is_initialized = 0;
+}
+
+int
+PyThread_tss_set(Py_tss_t *key, void *value)
+{
+    assert(key != NULL);
+    int fail = pthread_setspecific(key->_key, value);
+    return fail ? -1 : 0;
+}
+
+void *
+PyThread_tss_get(Py_tss_t *key)
+{
+    assert(key != NULL);
+    return pthread_getspecific(key->_key);
+}