Add SQLite support, fix un-thread-safe DB caches, small performance f… (#172)

* Add SQLite support, fix un-thread-safe DB caches, small performance fixes

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* add SQLite licenses to README

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* appease the linter, and fix my dumbass-ery

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* make requested changes

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* add back comment

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/vendor/modernc.org/sqlite/mutex.go b/vendor/modernc.org/sqlite/mutex.go
new file mode 100644
index 000000000..ec39444d3
--- /dev/null
+++ b/vendor/modernc.org/sqlite/mutex.go
@@ -0,0 +1,23 @@
+// Copyright 2019 The Sqlite Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlite // import "modernc.org/sqlite"
+
+import (
+	"sync"
+	"unsafe"
+
+	"modernc.org/libc"
+	"modernc.org/libc/sys/types"
+)
+
+type mutex struct {
+	sync.Mutex
+}
+
+func mutexAlloc(tls *libc.TLS) uintptr {
+	return libc.Xcalloc(tls, 1, types.Size_t(unsafe.Sizeof(mutex{})))
+}
+
+func mutexFree(tls *libc.TLS, m uintptr) { libc.Xfree(tls, m) }