gh-134745: Remove dead code in thread_nt.h left by GH-134747

Python/thread_nt.h

@@ -11,142 +11,6 @@
 #include <process.h>
 #endif
 
-/* options */
-#ifndef _PY_USE_CV_LOCKS
-#define _PY_USE_CV_LOCKS 1     /* use locks based on cond vars */
-#endif
-
-/* Now, define a non-recursive mutex using either condition variables
- * and critical sections (fast) or using operating system mutexes
- * (slow)
- */
-
-#if _PY_USE_CV_LOCKS
-
-#include "condvar.h"
-
-typedef struct _NRMUTEX
-{
-    PyMUTEX_T cs;
-    PyCOND_T cv;
-    int locked;
-} NRMUTEX;
-typedef NRMUTEX *PNRMUTEX;
-
-static PNRMUTEX
-AllocNonRecursiveMutex(void)
-{
-    PNRMUTEX m = (PNRMUTEX)PyMem_RawMalloc(sizeof(NRMUTEX));
-    if (!m)
-        return NULL;
-    if (PyCOND_INIT(&m->cv))
-        goto fail;
-    if (PyMUTEX_INIT(&m->cs)) {
-        PyCOND_FINI(&m->cv);
-        goto fail;
-    }
-    m->locked = 0;
-    return m;
-fail:
-    PyMem_RawFree(m);
-    return NULL;
-}
-
-static VOID
-FreeNonRecursiveMutex(PNRMUTEX mutex)
-{
-    if (mutex) {
-        PyCOND_FINI(&mutex->cv);
-        PyMUTEX_FINI(&mutex->cs);
-        PyMem_RawFree(mutex);
-    }
-}
-
-static DWORD
-EnterNonRecursiveMutex(PNRMUTEX mutex, DWORD milliseconds)
-{
-    DWORD result = WAIT_OBJECT_0;
-    if (PyMUTEX_LOCK(&mutex->cs))
-        return WAIT_FAILED;
-    if (milliseconds == INFINITE) {
-        while (mutex->locked) {
-            if (PyCOND_WAIT(&mutex->cv, &mutex->cs)) {
-                result = WAIT_FAILED;
-                break;
-            }
-        }
-    } else if (milliseconds != 0) {
-        /* wait at least until the deadline */
-        PyTime_t timeout = (PyTime_t)milliseconds * (1000 * 1000);
-        PyTime_t deadline = _PyDeadline_Init(timeout);
-        while (mutex->locked) {
-            PyTime_t microseconds = _PyTime_AsMicroseconds(timeout,
-                                                           _PyTime_ROUND_TIMEOUT);
-            if (PyCOND_TIMEDWAIT(&mutex->cv, &mutex->cs, microseconds) < 0) {
-                result = WAIT_FAILED;
-                break;
-            }
-
-            timeout = _PyDeadline_Get(deadline);
-            if (timeout <= 0) {
-                break;
-            }
-        }
-    }
-    if (!mutex->locked) {
-        mutex->locked = 1;
-        result = WAIT_OBJECT_0;
-    } else if (result == WAIT_OBJECT_0)
-        result = WAIT_TIMEOUT;
-    /* else, it is WAIT_FAILED */
-    PyMUTEX_UNLOCK(&mutex->cs); /* must ignore result here */
-    return result;
-}
-
-static BOOL
-LeaveNonRecursiveMutex(PNRMUTEX mutex)
-{
-    BOOL result;
-    if (PyMUTEX_LOCK(&mutex->cs))
-        return FALSE;
-    mutex->locked = 0;
-    /* condvar APIs return 0 on success. We need to return TRUE on success. */
-    result = !PyCOND_SIGNAL(&mutex->cv);
-    PyMUTEX_UNLOCK(&mutex->cs);
-    return result;
-}
-
-#else /* if ! _PY_USE_CV_LOCKS */
-
-/* NR-locks based on a kernel mutex */
-#define PNRMUTEX HANDLE
-
-static PNRMUTEX
-AllocNonRecursiveMutex(void)
-{
-    return CreateSemaphore(NULL, 1, 1, NULL);
-}
-
-static VOID
-FreeNonRecursiveMutex(PNRMUTEX mutex)
-{
-    /* No in-use check */
-    CloseHandle(mutex);
-}
-
-static DWORD
-EnterNonRecursiveMutex(PNRMUTEX mutex, DWORD milliseconds)
-{
-    return WaitForSingleObjectEx(mutex, milliseconds, FALSE);
-}
-
-static BOOL
-LeaveNonRecursiveMutex(PNRMUTEX mutex)
-{
-    return ReleaseSemaphore(mutex, 1, NULL);
-}
-#endif /* _PY_USE_CV_LOCKS */
-
 unsigned long PyThread_get_thread_ident(void);
 
 #ifdef PY_HAVE_THREAD_NATIVE_ID