util: Explain why the path is cached

1 files changed, 8 insertions, 14 deletions

diff --git a/src/util/system.cpp b/src/util/system.cpp
index fca29a9f31..87ff6e62ba 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2018 The Bitcoin Core developers
+// Copyright (c) 2009-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -705,19 +705,16 @@ fs::path GetDefaultDataDir()
 static fs::path g_blocks_path_cache_net_specific;
 static fs::path pathCached;
 static fs::path pathCachedNetSpecific;
-static CCriticalSection csPathCached;
+static RecursiveMutex csPathCached;
 
 const fs::path &GetBlocksDir()
 {
-
     LOCK(csPathCached);
-
     fs::path &path = g_blocks_path_cache_net_specific;
 
-    // This can be called during exceptions by LogPrintf(), so we cache the
-    // value so we don't have to do memory allocations after that.
-    if (!path.empty())
-        return path;
+    // Cache the path to avoid calling fs::create_directories on every call of
+    // this function
+    if (!path.empty()) return path;
 
     if (gArgs.IsArgSet("-blocksdir")) {
         path = fs::system_complete(gArgs.GetArg("-blocksdir", ""));
@@ -737,15 +734,12 @@ const fs::path &GetBlocksDir()
 
 const fs::path &GetDataDir(bool fNetSpecific)
 {
-
     LOCK(csPathCached);
-
     fs::path &path = fNetSpecific ? pathCachedNetSpecific : pathCached;
 
-    // This can be called during exceptions by LogPrintf(), so we cache the
-    // value so we don't have to do memory allocations after that.
-    if (!path.empty())
-        return path;
+    // Cache the path to avoid calling fs::create_directories on every call of
+    // this function
+    if (!path.empty()) return path;
 
     if (gArgs.IsArgSet("-datadir")) {
         path = fs::system_complete(gArgs.GetArg("-datadir", ""));