如何在 c 的 pthread 中將結構作為參數傳遞

Question

如何在 c 的 pthread 中將結構作為參數傳遞

    void * aFunction (aStruct1 *theStruct1, aStruct2 *theStruct2, aStruct3 *theStruct3){
        printf("%s", theStruct1->text);
    }
    
    pthread_t thread[2];
    pthread_create(&thread[0], NULL, aFunction, "how do i pass all the struct argument here (theStruct1, theStruct2 , theStruct3)");
    pthread_create(&thread[1], NULL, aFunction, "how do i pass all the struct argument here  (theStruct1, theStruct2 , theStruct3)");
    pthread_join(thread[1],NULL);
    pthread_join(thread[2],NULL);

我試過這樣稱呼它，但沒有結果

    void * aFunction (aStruct1 *theStruct1, aStruct2 *theStruct2, aStruct3 *theStruct3){
        printf("%s", theStruct1->text);
    }
    
    pthread_t thread[2];
    pthread_create(&thread[0], NULL, aFunction(theStruct1, theStruct2 , theStruct3), NULL);
    pthread_create(&thread[1], NULL, aFunction(theStruct1, theStruct2 , theStruct3), NULL);
    pthread_join(thread[1],NULL);
    pthread_join(thread[2],NULL);

Answer 1

傳遞給pthread_create的線程啟動 function必須采用單個void *參數。

由於您要傳入多個結構，因此您需要定義一個附加結構，其中包含線程 function 預期的所有數據並傳遞一個指向該結構的指針。

struct thread_args {
    aStruct1 *s1;
    aStruct2 *s2;
    aStruct3 *s3;
};

void *aFunction (void *p){
    struct thread_args *args = p;
    printf("%s", args->s1->text);
    return NULL;
}

struct thread_args args[] = {
    { theStruct1, theStruct2, theStruct3 },
    { theStruct1, theStruct2, theStruct3 }
};
pthread_create(&thread[0], NULL, aFunction, &args[0]);
pthread_create(&thread[0], NULL, aFunction, &args[1]);