From 7c89b38a2da041bb3bd4f5db59151ea430c5b1f0 Mon Sep 17 00:00:00 2001
From: Gert-Jan Timmer <gjr.timmer@gmail.com>
Date: Fri, 25 May 2018 15:33:53 +0200
Subject: [PATCH] Implementation for usleep

Implement `usleep` for Windows OS.
---
 sqlite3_opt_usleep.go     | 13 -------------
 sqlite3_usleep_windows.go | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 13 deletions(-)
 delete mode 100644 sqlite3_opt_usleep.go
 create mode 100644 sqlite3_usleep_windows.go

diff --git a/sqlite3_opt_usleep.go b/sqlite3_opt_usleep.go
deleted file mode 100644
index d6ed38f..0000000
--- a/sqlite3_opt_usleep.go
+++ /dev/null
@@ -1,13 +0,0 @@
-// +build cgo
-// +build windows
-
-// Copyright (C) 2018 G.J.R. Timmer <gjr.timmer@gmail.com>.
-//
-// Use of this source code is governed by an MIT-style
-// license that can be found in the LICENSE file.
-
-package sqlite3
-
-/*
-
-/*
diff --git a/sqlite3_usleep_windows.go b/sqlite3_usleep_windows.go
new file mode 100644
index 0000000..fe4187d
--- /dev/null
+++ b/sqlite3_usleep_windows.go
@@ -0,0 +1,39 @@
+// +build cgo
+
+// Copyright (C) 2018 G.J.R. Timmer <gjr.timmer@gmail.com>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package sqlite3
+
+// usleep is a function available on *nix based systems.
+// This function is not present in Windows.
+// Windows has a sleep function but this works with seconds
+// and not with microseconds as usleep.
+//
+// This code should improve performance on windows because
+// without the presence of usleep SQLite waits 1 second.
+//
+// Source: https://stackoverflow.com/questions/5801813/c-usleep-is-obsolete-workarounds-for-windows-mingw?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
+
+/*
+#include <windows.h>
+
+void usleep(__int64 usec)
+{
+    HANDLE timer;
+    LARGE_INTEGER ft;
+
+	// Convert to 100 nanosecond interval, negative value indicates relative time
+    ft.QuadPart = -(10*usec);
+
+    timer = CreateWaitableTimer(NULL, TRUE, NULL);
+    SetWaitableTimer(timer, &ft, 0, NULL, NULL, 0);
+    WaitForSingleObject(timer, INFINITE);
+    CloseHandle(timer);
+}
+*/
+import "C"
+
+// EOF