From: Morosophos <morosophos@teichisma.info>
Date: Tue, 10 Sep 2019 13:49:15 +0000 (+0300)
Subject: Add a simplistic locking for server database.
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=17c00aa39e156283abede12265592c93b5a822a3;p=xonotic%2Fxonotic-data.pk3dir.git

Add a simplistic locking for server database.

This can help 3rd party tools to not read the database while it's
being written.
---

diff --git a/qcsrc/lib/map.qh b/qcsrc/lib/map.qh
index ea7f0e1fe..42790ca4b 100644
--- a/qcsrc/lib/map.qh
+++ b/qcsrc/lib/map.qh
@@ -7,6 +7,11 @@ const int DB_BUCKETS = 8192;
 ERASEABLE
 void db_save(int db, string filename)
 {
+        string lock_filename = strcat(filename, ".lock");
+        int fh_lock = fopen(lock_filename, FILE_WRITE);
+        fputs(fh_lock, "LOCKED\n");
+        fclose(fh_lock);
+
 	int fh = fopen(filename, FILE_WRITE);
 	if (fh < 0)
 	{
@@ -17,6 +22,9 @@ void db_save(int db, string filename)
 	for (int i = 0, n = buf_getsize(db); i < n; ++i)
 		fputs(fh, strcat(bufstr_get(db, i), "\n"));
 	fclose(fh);
+                fh_lock = fopen(lock_filename, FILE_WRITE);
+        fputs(fh_lock, "UNLOCKED\n");
+        fclose(fh_lock);
 }
 
 USING(HashMap, int);