Function LockDirectory

src/util/system.cpp:111–133

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)
{
    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
    if (dir_locks.count(fs::PathToString(pathLockFile))) {
        return true;
    }

    // Create empty lock file if it doesn't exist.
    FILE* file = fsbridge::fopen(pathLockFile, "a");
    if (file) fclose(file);
    auto lock = std::make_unique<fsbridge::FileLock>(pathLockFile);
    if (!lock->TryLock()) {
        return error("Error while attempting to lock directory %s: %s", fs::PathToString(directory), lock->GetReason());
    }
    if (!probe_only) {
        // Lock successful and we're not just probing, put it into the map
        dir_locks.emplace(fs::PathToString(pathLockFile), std::move(lock));
    }
    return true;
}

void UnlockDirectory(const fs::path& directory, const std::string& lockfile_name)
{