test: Add unit test for LockDirectory

Add a unit test for LockDirectory, introduced in #11281.

Github-Pull: #12422
Rebased-From: 1d4cbd26e4220982f7f2f60e447199d6f62ae254
Tree-SHA512: 8186f4b22c65153e30ec1e0b68be20fd59d34e1fe565d99f3b5a302780125953b867fb14c37144de3fd7baf5751df94bf3901eebbb7b820491ca452706d4e205

1 files changed, 18 insertions, 9 deletions

diff --git a/src/util.cpp b/src/util.cpp
index 0769df4b3b..6ec7cba2ad 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -376,19 +376,22 @@ int LogPrintStr(const std::string &str)
     return ret;
 }
 
+/** 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<boost::interprocess::file_lock>> dir_locks;
+/** Mutex to protect dir_locks. */
+static std::mutex cs_dir_locks;
+
 bool LockDirectory(const fs::path& directory, const std::string lockfile_name, bool probe_only)
 {
-    // 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.
-    static std::map<std::string, std::unique_ptr<boost::interprocess::file_lock>> locks;
-    // Protect the map with a mutex
-    static std::mutex cs;
-    std::lock_guard<std::mutex> ulock(cs);
+    std::lock_guard<std::mutex> ulock(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
-    if (locks.count(pathLockFile.string())) {
+    if (dir_locks.count(pathLockFile.string())) {
         return true;
     }
 
@@ -403,7 +406,7 @@ bool LockDirectory(const fs::path& directory, const std::string lockfile_name, b
         }
         if (!probe_only) {
             // Lock successful and we're not just probing, put it into the map
-            locks.emplace(pathLockFile.string(), std::move(lock));
+            dir_locks.emplace(pathLockFile.string(), std::move(lock));
         }
     } catch (const boost::interprocess::interprocess_exception& e) {
         return error("Error while attempting to lock directory %s: %s", directory.string(), e.what());
@@ -411,6 +414,12 @@ bool LockDirectory(const fs::path& directory, const std::string lockfile_name, b
     return true;
 }
 
+void ReleaseDirectoryLocks()
+{
+    std::lock_guard<std::mutex> ulock(cs_dir_locks);
+    dir_locks.clear();
+}
+
 /** Interpret string as boolean, for argument parsing */
 static bool InterpretBool(const std::string& strValue)
 {