pthread_create不工作。传递参数3警告-pthread_createnotworking.passingargument3warning

12  

SimpleThread should be declared as

SimpleThread应该声明为。

void* SimpleThread(void *args) {
}

When you pass parameters to your thread, it is best to define a struct for them, pass a pointer to that struct as void*, and cast back to the right type inside the function.

当您将参数传递给线程时，最好为它们定义一个结构，传递一个指向该结构的指针作为void*，然后返回到函数内的正确类型。

3  

Here's a compiling and "working" version of your program, although I have to admit to not knowing exactly what it's doing. For the critics in the audience, I apologize in advance for the pthread_join loop at the end.

这里有一个编译和“工作”版本的程序，虽然我不得不承认，我不知道它到底在做什么。对于观众中的批评者，我提前为pthread_join循环表示歉意。

#include 
#include 
#include 

#define NUM_THREADS 5

struct my_thread_info {
    long which;
};

int SharedVariable = 0;

void *SimpleThread(void *data)
{
    int num, val;
    struct my_thread_info *info = data;

    for (num = 0; num <20; num++) {
        if (random() > RAND_MAX / 2)
            usleep(10);
        val = SharedVariable;
        printf("*** thread %ld sees value %d\n", info->which, val);
        SharedVariable = val + 1;
    }

    val = SharedVariable;
    printf("Thread %ld sees final value %d\n", info->which, val);

    free(info);
    return NULL;
}

int main(int argc, char *argv[])
{
    pthread_t threads[NUM_THREADS];
    int rc;
    long t;
    struct my_thread_info *info;
    for (t = 0; t which = t;

        rc = pthread_create(&threads[t], NULL, SimpleThread, info);
        if (rc) {
            printf("ERROR; return code from pthread_create() is %d\n", rc);
            exit(-1);
        }
    }

    for (t = 0; t