“新”多线程中的运算符会导致分段错误

发布于 2024-09-16 17:55:50 字数 1531 浏览 3 评论 0 原文

这与我此处和此处，但由于我的调查使我离开从STL作为潜在问题，到“新”作为我的敌人，我认为最好开始一个新线程。

重申一下，我使用的是嵌入式平台供应商提供的arm-linux交叉编译器（版本2.95.2）。

当我在 Linux PC 上运行下面的应用程序时，它当然永远不会失败。然而，当在嵌入式设备上运行它时，我每次都会遇到分段错误。使用“malloc”永远不会失败。使用互斥体同步“新”分配将阻止该问题，但这在我的主要应用程序中并不实用。

任何人都可以建议为什么会发生这种情况，或者有任何想法如何解决这个问题？

谢谢。

#include <stdio.h>
#include <pthread.h>


pthread_mutex_t _logLock = PTHREAD_MUTEX_INITIALIZER;

static void* Thread(void *arg)
{
    int i = 0;
    while (i++ < 500)
    {
        // pthread_mutex_lock(&_logLock);
        char* myDyn = (char*) new char[1023];

        //        char* buffer = (char*) malloc(1023);
        //        if (buffer == NULL)
        //            printf("Out of mem\n");
        //        free(buffer);


        delete[] myDyn;

        //pthread_mutex_unlock(&_logLock);


    }
    pthread_exit(NULL);
}

int main(int argc, char** argv)
{
    int threads = 50;
    pthread_t _rx_thread[threads];
    for (int i = 0; i < threads; i++)
    {
        printf("Start Thread: %i\n", i);
        pthread_create(&_rx_thread[i], NULL, Thread, NULL);
    }

    for (int i = 0; i < threads; i++)
    {
        pthread_join(_rx_thread[i], NULL);
        printf("End Thread: %i\n", i);
    }
}

原文

This is related to an issue I have been discussing here and here, but as my investigations have led me away from the STL as the potential issue, and towards "new" as my nemisis, I thought it best to start a new thread.

To reiterate, I am using an arm-linux cross compiler (version 2.95.2) supplied by the embedded platform vendor.

When I run the application below on my Linux PC, it of course works never fails. However when running it on the embedded device, I get segmentation faults every time. Using "malloc" never fails. Synchronising the "new" allocation using the mutex will stop the issue, but this is not practical in my main application.

Can anyone suggest why this might be occurring, or have any ideas how I can get around this issue?

Thanks.

#include <stdio.h>
#include <pthread.h>


pthread_mutex_t _logLock = PTHREAD_MUTEX_INITIALIZER;

static void* Thread(void *arg)
{
    int i = 0;
    while (i++ < 500)
    {
        // pthread_mutex_lock(&_logLock);
        char* myDyn = (char*) new char[1023];

        //        char* buffer = (char*) malloc(1023);
        //        if (buffer == NULL)
        //            printf("Out of mem\n");
        //        free(buffer);


        delete[] myDyn;

        //pthread_mutex_unlock(&_logLock);


    }
    pthread_exit(NULL);
}

int main(int argc, char** argv)
{
    int threads = 50;
    pthread_t _rx_thread[threads];
    for (int i = 0; i < threads; i++)
    {
        printf("Start Thread: %i\n", i);
        pthread_create(&_rx_thread[i], NULL, Thread, NULL);
    }

    for (int i = 0; i < threads; i++)
    {
        pthread_join(_rx_thread[i], NULL);
        printf("End Thread: %i\n", i);
    }
}

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