Function rdbSaveBackgroundFork

src/rdb.cpp:1598–1634

}

int rdbSaveBackgroundFork(rdbSaveInfo *rsi) {
    pid_t childpid;

    if (hasActiveChildProcess() || g_pserver->rdb_child_pid != -1) return C_ERR;
    serverAssert(g_pserver->rdb_child_pid != 10000);

    g_pserver->dirty_before_bgsave = g_pserver->dirty;
    g_pserver->lastbgsave_try = time(NULL);

    if ((childpid = redisFork(CHILD_TYPE_RDB)) == 0) {
        int retval;

        /* Child */
        g_pserver->rdb_child_pid = 10000;
        redisSetProcTitle("keydb-rdb-bgsave");
        redisSetCpuAffinity(g_pserver->bgsave_cpulist);
        retval = rdbSave(nullptr, rsi);
        if (retval == C_OK) {
            sendChildCowInfo(CHILD_INFO_TYPE_RDB_COW_SIZE, "RDB");
        }
        exitFromChild((retval == C_OK) ? 0 : 1);
    } else {
        /* Parent */
        if (childpid == -1) {
            g_pserver->lastbgsave_status = C_ERR;
            serverLog(LL_WARNING,"Can't save in background: fork: %s",
                strerror(errno));
            return C_ERR;
        }
        serverLog(LL_NOTICE,"Background saving started by pid %d",childpid);
        g_pserver->rdb_save_time_start = time(NULL);
        g_pserver->rdb_child_type = RDB_CHILD_TYPE_DISK;
        updateDictResizePolicy();
        return C_OK;
    }
    return C_OK; /* unreached */
}

int launchRdbSaveThread(pthread_t &child, rdbSaveInfo *rsi)
{