Make improvements

- Make rand64() thread safe
- Introduce lemur64 lcg prng
- Improve strace on New Technology
- Improve msync() on New Technology

libc/intrin/flushfilebuffers.greg.c

@@ -0,0 +1,43 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/internal.h"
+#include "libc/calls/strace.internal.h"
+#include "libc/nt/files.h"
+
+extern typeof(FlushFileBuffers) *const __imp_FlushFileBuffers __msabi;
+
+/**
+ * Flushes buffers of specified file to disk.
+ *
+ * This provides a stronger degree of assurance and blocking for things
+ * to be sent to a physical medium, but it's not guaranteed unless your
+ * file is opened in a direct non-caching mode. One main advantage here
+ * seems to be coherency.
+ *
+ * @note this wrapper takes care of ABI, STRACE(), and __winerr()
+ * @note consider buying a ups
+ * @see FlushViewOfFile()
+ */
+textwindows bool32 FlushFileBuffers(int64_t hFile) {
+  bool32 ok;
+  ok = __imp_FlushFileBuffers(hFile);
+  if (!ok) __winerr();
+  STRACE("FlushFileBuffers(%ld) → %hhhd% m", hFile, ok);
+  return ok;
+}