From e6067a953d0c8093a4e9127b32aeaca8dab5eb31 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Canna=C3=B2?= <rene.cannao@gmail.com>
Date: Sun, 30 Aug 2015 07:34:35 +0000
Subject: [PATCH] External locking for SQLite3DB()

Closes #368
---
 include/sqlite3db.h |  7 +++++++
 lib/sqlite3db.cpp   | 16 ++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/sqlite3db.h b/include/sqlite3db.h
index 7c8c3869d..261868f26 100644
--- a/include/sqlite3db.h
+++ b/include/sqlite3db.h
@@ -138,6 +138,7 @@ class SQLite3DB {
 	private:
 	char *url;
 	sqlite3 *db;
+	rwlock_t rwlock;
 	public:
 	char *get_url() const { return url; }
 	sqlite3 *get_db() const { return db; }
@@ -145,6 +146,12 @@ class SQLite3DB {
 	SQLite3DB();
 	~SQLite3DB();
 	int open(char *, int);
+
+	void rdlock();
+	void rdunlock();
+	void wrlock();
+	void wrunlock();
+
 	bool execute(const char *);
 	bool execute_statement(const char *, char **, int *, int *, SQLite3_result **);
 	int return_one_int(const char *);
diff --git a/lib/sqlite3db.cpp b/lib/sqlite3db.cpp
index 0b7f7d8fb..630c75d48 100644
--- a/lib/sqlite3db.cpp
+++ b/lib/sqlite3db.cpp
@@ -7,6 +7,7 @@ SQLite3DB::SQLite3DB() {
 	db=NULL;
 	url=NULL;
 	assert_on_error=0;
+	spinlock_rwlock_init(&rwlock);
 }
 
 SQLite3DB::~SQLite3DB() {
@@ -161,3 +162,18 @@ bool SQLite3DB::check_and_build_table(char *table_name, char *table_def) {
 	return rcb;
 }
 
+void SQLite3DB::rdlock() {
+	spin_wrlock(&rwlock);
+}
+
+void SQLite3DB::rdunlock() {
+	spin_wrunlock(&rwlock);
+}
+
+void SQLite3DB::wrlock() {
+	spin_wrlock(&rwlock);
+}
+
+void SQLite3DB::wrunlock() {
+	spin_wrunlock(&rwlock);
+}