util/system.cpp: add thread safety annotations for dir_locks

src/util/system.cpp

@@ -3,6 +3,7 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <sync.h>
 #include <util/system.h>
 
 #include <chainparamsbase.h>
@@ -75,18 +76,18 @@ const char * const BITCOIN_CONF_FILENAME = "bitcoin.conf";
 
 ArgsManager gArgs;
 
+/** Mutex to protect dir_locks. */
+static Mutex cs_dir_locks;
 /** A map that contains all the currently held directory locks. After
  * successful locking, these will be held here until the global destructor
  * cleans them up and thus automatically unlocks them, or ReleaseDirectoryLocks
  * is called.
  */
-static std::map<std::string, std::unique_ptr<fsbridge::FileLock>> dir_locks;
-/** Mutex to protect dir_locks. */
-static std::mutex cs_dir_locks;
+static std::map<std::string, std::unique_ptr<fsbridge::FileLock>> dir_locks GUARDED_BY(cs_dir_locks);
 
 bool LockDirectory(const fs::path& directory, const std::string lockfile_name, bool probe_only)
 {
-    std::lock_guard<std::mutex> ulock(cs_dir_locks);
+    LOCK(cs_dir_locks);
     fs::path pathLockFile = directory / lockfile_name;
 
     // If a lock for this directory already exists in the map, don't try to re-lock it
@@ -110,13 +111,13 @@ bool LockDirectory(const fs::path& directory, const std::string lockfile_name, b
 
 void UnlockDirectory(const fs::path& directory, const std::string& lockfile_name)
 {
-    std::lock_guard<std::mutex> lock(cs_dir_locks);
+    LOCK(cs_dir_locks);
     dir_locks.erase((directory / lockfile_name).string());
 }
 
 void ReleaseDirectoryLocks()
 {
-    std::lock_guard<std::mutex> ulock(cs_dir_locks);
+    LOCK(cs_dir_locks);
     dir_locks.clear();
 }