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/nsync/futex.c

@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/atomic.h"
 #include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
 #include "libc/calls/sig.internal.h"
 #include "libc/calls/state.internal.h"
 #include "libc/calls/struct/timespec.h"
@@ -166,15 +167,19 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
 			if (pshare) {
 				goto Polyfill;
 			}
-			if (timeout) {
-				ms = _timespec_tomillis (*timeout);
+			if (_check_interrupts (false, 0)) {
+				rc = -EINTR;
 			} else {
-				ms = -1;
-			}
-			if (WaitOnAddress (p, &expect, sizeof(int), ms)) {
-				rc = 0;
-			} else {
-				rc = -GetLastError ();
+				if (timeout) {
+					ms = _timespec_tomillis (*timeout);
+				} else {
+					ms = -1;
+				}
+				if (WaitOnAddress (p, &expect, sizeof(int), ms)) {
+					rc = 0;
+				} else {
+					rc = -GetLastError ();
+				}
 			}
 		} else if (IsFreebsd ()) {
 			rc = sys_umtx_timedwait_uint (
@@ -193,7 +198,7 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
 		__get_tls()->tib_flags &= ~TIB_FLAG_TIME_CRITICAL;
 	}
 
-	STRACE ("futex(%t, %s, %d, %s) → %s",
+	STRACE ("futex(%t, %s, %#x, %s) → %s",
 		p, DescribeFutexOp (op), expect,
 		DescribeTimespec (0, timeout),
 		DescribeErrnoResult (rc));

third_party/nsync/mem/nsync_sem_wait.c

@@ -16,6 +16,7 @@
 │ limitations under the License.                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/errno.h"
+#include "libc/runtime/runtime.h"
 #include "third_party/nsync/atomic.h"
 #include "third_party/nsync/atomic.internal.h"
 #include "third_party/nsync/common.internal.h"
@@ -81,5 +82,3 @@ int nsync_sem_wait_with_cancel_ (waiter *w, nsync_time abs_deadline,
 	}
 	return (sem_outcome);
 }
-
-

third_party/nsync/mem/nsync_sem_wait_no_note.c

@@ -1,33 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
-│vi: set et ft=c ts=8 tw=8 fenc=utf-8                                       :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2016 Google Inc.                                                   │
-│                                                                              │
-│ Licensed under the Apache License, Version 2.0 (the "License");              │
-│ you may not use this file except in compliance with the License.             │
-│ You may obtain a copy of the License at                                      │
-│                                                                              │
-│     http://www.apache.org/licenses/LICENSE-2.0                               │
-│                                                                              │
-│ Unless required by applicable law or agreed to in writing, software          │
-│ distributed under the License is distributed on an "AS IS" BASIS,            │
-│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.     │
-│ See the License for the specific language governing permissions and          │
-│ limitations under the License.                                               │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "third_party/nsync/common.internal.h"
-#include "third_party/nsync/mu_semaphore.h"
-
-asm(".ident\t\"\\n\\n\
-*NSYNC (Apache 2.0)\\n\
-Copyright 2016 Google, Inc.\\n\
-https://github.com/google/nsync\"");
-// clang-format off
-
-/* Wait until one of:
-     w->sem is non-zero----decrement it and return 0.
-     abs_deadline expires---return ETIMEDOUT.
-     Ignores cancel_note. */
-int nsync_sem_wait_with_cancel_ (waiter *w, nsync_time abs_deadline, nsync_note cancel_note) {
-	return (nsync_mu_semaphore_p_with_deadline (&w->sem, abs_deadline));
-}