我有一个用c++编写的多线程linux应用程序，运行在i.mx6 arm上。我有一个25lc256SPIEEPROM映射到文件系统。在驱动程序级别，写操作相对较慢，在那里可以做的不多。问题是文件函数阻塞其他线程的时间太长了。睡眠补充似乎没有帮助，似乎我将不得不做一些不同的事情，但对我来说还不清楚该改变什么。

从一个线程调用此函数的输出是

EEprom写 EEprom存于522.000000 703.000000 705.000000 723.000000 662596.000000 1328858.000000 捕获-EPIPE snd_pcm_prepare

我想，由于阻塞的线程，捕获-EPIPE snd_pcm_prepare来自音频缓冲区运行不足的线程。

int SaveCurrentConfig(void) {//EEPROM
    int r = 1;
    struct timeval tvs, tv1, tv2, tv3, tv4, tv5, tv6;
    gettimeofday(&tvs, NULL);
    printf("EEprom write\n");
    pthread_mutex_lock(&eepromconfigmutex);
        char * ConfigXml = BuildXmlConfig();
        FILE * WriteConfig = fopen(ConfigPath, "w");
        if (WriteConfig == NULL) {
            MyLog("Unable to open eeprom %s\n", strerror(errno));
            r = 0;
            goto badfinish;
        gettimeofday(&tv1, NULL);
        size_t len = strlen(ConfigXml);
        unsigned short CRC = ComputeChecksum(ConfigXml, len);
        fwrite((char*) &len, 1, sizeof (size_t), WriteConfig);
        gettimeofday(&tv2, NULL);
        fwrite((char*) &CRC, 1, 2, WriteConfig);
        gettimeofday(&tv3, NULL);
        fwrite(ConfigXml, 1, strlen(ConfigXml), WriteConfig);
        gettimeofday(&tv4, NULL);
        fseek(WriteConfig, ConfigOffset2, SEEK_SET);
        fwrite((char*) &len, 1, sizeof (size_t), WriteConfig);
        fwrite((char*) &CRC, 1, 2, WriteConfig);
        fwrite(ConfigXml, 1, strlen(ConfigXml), WriteConfig);
        gettimeofday(&tv5, NULL);
        fclose(WriteConfig);
badfinish:
        free(ConfigXml);
    pthread_mutex_unlock(&eepromconfigmutex);
    gettimeofday(&tv6, NULL);
    double diff1 = time_diff(tvs, tv1);
    double diff2 = time_diff(tvs, tv2);
    double diff3 = time_diff(tvs, tv3);
    double diff4 = time_diff(tvs, tv4);
    double diff5 = time_diff(tvs, tv5);
    double diff6 = time_diff(tvs, tv6);