Method msync

Core/MemoryFile.cpp:224–237

}

bool MemoryFile::msync(SyncFlag syncFlag) {
    if (m_readOnly) {
        // there's no point in msync() readonly memory
        return true;
    }
    if (m_ptr) {
        auto ret = ::msync(m_ptr, m_size, syncFlag ? MS_SYNC : MS_ASYNC);
        if (ret == 0) {
            return true;
        }
        MMKVError("fail to msync [%s], %s", m_diskFile.m_path.c_str(), strerror(errno));
    }
    return false;
}

bool MemoryFile::mmapOrCleanup(FileLock *fileLock) {
    auto oldPtr = m_ptr;