Question

我正在尝试创建一个pthread，我对创建它所需的参数感到困惑。

我试图将多个参数传递给pthread的entry函数，并将其封装到struct中。但是，pthread_create不接受它。

以下是我的代码的相关部分：

    Customer_Spawn_Params *params = (Customer_Spawn_Params*) malloc(sizeof(Customer_Spawn_Params));
    params->probability = chance;
    params->queue = queue;

    pthread_t customer_spawn_t;
    if (pthread_create(&customer_spawn_t, NULL, enqueue_customers, &params)) {
    }

这是Customer_Spawn_Params结构：

 typedef struct {
        Queue *queue;
        double probability;
} Customer_Spawn_Params;

最后，这里是enqueue_customers()接受指向Customer_Spawn_Params struct的指针：

    void *enqueue_customers(Customer_Spawn_Params *params) {
        int customer_id = 0;
        double probability = params->probability;
        Queue *queue = params->queue;
        while(true) {
                sleep(1);
                bool next_customer = next_bool(probability);
                if (next_customer) {
                        Customer *customer = (Customer*) malloc(sizeof(Customer));
                        customer->id = customer_id;
                        enqueue(queue, customer);
                        customer_id++;
                }
        }
        return NULL;
}

Answer 1

您的函数enqueue_customers没有正确的原型。它应该是

void *enqueue_customers(void* p) {
  Customer_Spawn_Params *params = p;
  ...

Answer 2

第1点。

if (pthread_create(&customer_spawn_t, NULL, enqueue_customers, &params))

更改为

if (pthread_create(&customer_spawn_t, NULL, enqueue_customers, params))。

因为，params本身就是指针。

第2点：

另外，

void *enqueue_customers(Customer_Spawn_Params *params)

应该是

void *enqueue_customers(void *params)

在你的函数中，你必须将它转换回实际的指针，例如，

void *enqueue_customers(void *params)
{
   Customer_Spawn_Params *p = params;

pthread_create不接受参数

2 个答案: