消费者生产者目录问题

问题描述

im在C中实现一个程序,该程序使用使用者生产者问题,并且遇到分段错误。基本上我有1个生产者线程和N个消费者线程,生产者线程必须通过我的文件系统进行递归搜索,然后将目录添加到缓冲区中。

使用者线程从缓冲区中获取一个元素,并检查这些目录中是否存在具有给定名称文件。我使用2个信号量和2个互斥量来解决此问题。问题在于,在完成一些工作之后,该程序要么阻塞,要么给出分段错误错误,而我找不到问题。

使用的变量:

void *recursive(char *diretorio,int indent);

//array of directories (buffer)
char *diretorios[20];

//consumption semaphore
sem_t sem_consumir;

//semaphore for producing
sem_t sem_produzir;

int prodptr=0,consptr=0;

//consumption mutex
pthread_mutex_t mutexCons;

//producing mutex
pthread_mutex_t mutexProd;

生产者代码

void *produtor()
{
    char * diretorio="/home/user";
    recursive(diretorio,0);

}


void *recursive(char * diretorio,int indent)
{
    DIR *dir;
    struct dirent *entry;
    int i;
    int value;

    if (!(dir = opendir(diretorio)))
        pthread_exit(NULL);

    while ((entry = readdir(dir)) != NULL)
    {
        if (entry->d_type == DT_DIR)
        {
            char path[PATH_MAX];
            if (strcmp(entry->d_name,".") == 0 || strcmp(entry->d_name,"..") == 0)
                continue;
            snprintf(path,sizeof(path),"%s/%s",diretorio,entry->d_name);
            printf("%*s[%s]\n",indent,"",entry->d_name);

            sem_wait(&sem_produzir);
            pthread_mutex_lock(&mutexProd);
            diretorios[prodptr]=strdup(path);
            prodptr=(prodptr+1)%10;
            pthread_mutex_unlock(&mutexProd);
            sem_post(&sem_consumir);

            recursive(path,indent + 2);

        }
    }

    closedir(dir);
    //pthread_exit(NULL);
}

消费者代码

//consumer code
void * consumir(MYFIND_DATA * data)
{


    char fullpath[PATH_MAX + 1];
    char *path;


    while(1)
    {
        char * diretorio;
        DIR *dir;
        struct dirent *entry;
        int value;
        //existe um diretorio para consumir

        sem_wait(&sem_consumir);

        pthread_mutex_lock(&mutexCons);
        diretorio = diretorios[consptr];
        consptr = (consptr+1) % 10;
        pthread_mutex_unlock(&mutexCons);
        sem_post(&sem_produzir);
        // }

        if ((dir = opendir(diretorio)) != NULL )
        {
            if(Findname(diretorio,data->nome))
            {

                printf("FILE ENCONTradO: %s em %s\n",entry->d_name);
                data->ocorrencias++;
            }

            //read directory entries
            while ((entry = readdir(dir)) != NULL)
            {


                if (strcmp(entry->d_name,".")!=0
                        && strcmp(entry->d_name,"..")!=0 )
                {
                    //look for a match
                    if(Findname(entry->d_name,data->nome))
                    {


                        printf("FILE FOUND: %s\n",entry->d_name);
                        data->ocorrencias++;

                    }

                }
            }



        }



    }
    printf("acabou o produtor");
    pthread_exit(NULL);

}

主要功能代码

int main(int argc,char *argv[])
{


    struct sigaction action;   
    action.sa_handler = signal_handler;
    sigemptyset(&action.sa_mask);

    sigaction(SIGINT,&action,NULL);

    int t;
    pthread_t tid[NUM_THREADS];
    pthread_t ttid;
    pthread_t tid_state;
    MYFIND_DATA data[NUM_THREADS];

    sem_init(&sem_produzir,10);

    sem_init(&sem_consumir,0);

    pthread_mutex_init(&mutexCons,NULL);

    pthread_mutex_init(&mutexProd,NULL);


    //create producer thread
    pthread_create(&ttid,&produtor,NULL);

    //create consumer thread
    for (t = 0; t<1; t++)
    {
        data[t].nome = "worksheet";
        data[t].ocorrencias=0;
        pthread_create (&tid[t],(void *)consumir,&data[t]);
    }


    pthread_join(ttid,NULL);


    for (t = 0; t<1; t++)
    {
        pthread_join (tid[t],NULL);

        printf("\nThread %d joined,ocorrencias = %d",t,data[t].ocorrencias);
    }

}

当我运行程序时,结果如下: program running in terminal

我已经检查过了,生产者完成了填充数组的工作,我认为问题出在生产用尽目录时,但是我不确定。任何想法可能是什么问题?

预先感谢

解决方法

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