Elevate Windows production worthiness

- SQLite file locking now works on Windows
- SQLite will now use fdatasync() on non-Apple platforms
- Fix Ctrl-C handler on Windows to not crash with TLS
- Signals now work in multithreaded apps on Windows
- fcntl() will now accurately report EINVAL errors
- fcntl() now has excellent --strace logging
- Token bucket replenish now go 100x faster
- *NSYNC cancellations now work on Windows
- Support closefrom() on NetBSD

third_party/python/Modules/posixmodule.c

@@ -62,6 +62,7 @@
 #include "libc/time/struct/utimbuf.h"
 #include "libc/time/time.h"
 #include "libc/x/x.h"
+#include "third_party/musl/lockf.h"
 #include "third_party/musl/passwd.h"
 #include "third_party/python/Include/abstract.h"
 #include "third_party/python/Include/boolobject.h"
@@ -11894,10 +11895,10 @@ all_ins(PyObject *m)
     if (PyModule_AddIntMacro(m, CLD_CONTINUED)) return -1;
 
     /* constants for lockf */
-    if (F_LOCK && PyModule_AddIntMacro(m, F_LOCK)) return -1;
-    if (F_TLOCK && PyModule_AddIntMacro(m, F_TLOCK)) return -1;
+    if (PyModule_AddIntMacro(m, F_LOCK)) return -1;
+    if (PyModule_AddIntMacro(m, F_TLOCK)) return -1;
     if (PyModule_AddIntMacro(m, F_ULOCK)) return -1;
-    if (F_TEST && PyModule_AddIntMacro(m, F_TEST)) return -1;
+    if (PyModule_AddIntMacro(m, F_TEST)) return -1;
 
 #ifdef HAVE_SPAWNV
     if (PyModule_AddIntConstant(m, "P_WAIT", _P_WAIT)) return -1;

third_party/python/pyconfig.h

@@ -227,7 +227,7 @@
 /* #undef HAVE_LINUX_CAN_RAW_FD_FRAMES */
 
 /* Define to 1 if you have the 'lockf' function and the F_LOCK macro. */
-/* #undef HAVE_LOCKF */
+#define HAVE_LOCKF 1
 
 /* #define HAVE_DEVICE_MACROS 1 */
 #define HAVE_MAKEDEV 1