Function testInterProcessLock

POSIX/demo/demo.cpp:308–353

}

void testInterProcessLock() {
    //auto mmkv = MMKV::mmkvWithID("TestInterProcessLock", MMKV_MULTI_PROCESS);
    //mmkv->set(true, "bool");

    auto fd = open("/tmp/mmkv/TestInterProcessLock.file", O_RDWR | O_CREAT | O_CLOEXEC, S_IRWXU);
    FileLock flock(fd);

//    auto fd2 = open("/tmp/mmkv/TestInterProcessLock2.file", O_RDWR | O_CREAT | O_CLOEXEC, S_IRWXU);
//    FileLock flock2(fd2);
//    flock2.lock(SharedLockType);
//    auto ptr = ::mmap(nullptr, DEFAULT_MMAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd2, 0);
//    printf("mmap fd %d to %p\n", fd2, ptr);
//    ::close(fd2);
//    flock2.destroyLock();

    auto pid = fork();
    // this is child
    if (pid <= 0) {
        execl("TestInterProcessLock", "TestInterProcessLock", nullptr);
        perror("execl"); // execl doesn't return unless there is a problem
        exit(1);
    }
    printf("Waiting for child %d to start ...\n", pid);
    sem_t *sem = sem_open("/mmkv_main", O_CREAT, 0644, 0);
    if (!sem) {
        printf("fail to create semaphore: %d(%s)\n", errno, strerror(errno));
        exit(1);
    }
    sem_wait(sem);
    printf("Child %d to started\n", pid);

    //mmkv->clearAll();
    //mmkv->lock();
    flock.lock(ExclusiveLockType);

    sem_post(sem);
    sem_close(sem);

    printf("Waiting for child %d to finish...\n", pid);
    waitpid(pid, nullptr, 0);
    printf("Child %d to finished\n", pid);

    //mmkv->unlock();
    flock.unlock(ExclusiveLockType);
    close(fd);
}

void cornetSizeTest() {
    string aesKey = "aes";