C++不完整類型和轉換錯誤

Question

我想用pthreads編寫一個C++函數來進行排序。接受以下2個錯誤，不知道爲什麼：

struct threadData{ 
int thread_id; 
int stopIndex; 
int startIndex; 
}; 

void createThreads(int k){ 
struct thread_data threadData; 

int numThreads = k; 
int i = 0; 
int err = 0; 
pthread_t *threads = static_cast<pthread_t*>(malloc(sizeof(pthread_t) * numThreads)); 
for(i = 0;i<numThreads;i++){ 
    threadData[i].thread_id = i; 
    //start and stop are 1 indexed 
    if(i==0){ 
     threadData[i].start = ((N/k)*i)+1; 
    } 
    else{ 
     threadData[i].start = ((N/k)*i); 
    } 
    threadData[i].stop = ((N/k)* (i+1)); 

    err = pthread_create(&threads[i], NULL, bubbleSort, (void *)&threadData[i]); // replace foo with bubbleSort() 
    if(err != 0){ 
     printf("error creating thread\n"); 
    } 
} 
} 

void *bubbleSort(void *threadArg){ 
struct threadData *threadData; 
threadData = (struct thread_data *) threadArg; 
printf("debug\n"); 
bool sorted = 0; 
int x; 
while(!sorted){ 
    int start = threadData->startIndex; 
    int stop = threadData->stopIndex; 

    sorted = 1; 
    for(x = num_array[start]; x < num_array[stop-1]; x++){ 
     if(num_array[x] > num_array[x+1]){ 
      int temp = num_array[x+1]; 
      num_array[x+1] = num_array[x]; 
      num_array[x] = temp; 
      sorted = 0; 
     } 
    } 
    if(sorted){ 
     break; 
    } 
    sorted = 1; 
    for(x = stop; x > start+1; x--){ 
     if(num_array[x-1] > num_array[x]){ 
      int temp = num_array[x-1]; 
      num_array[x-1] = num_array[x]; 
      num_array[x] = temp; 
      sorted = 0; 
     } 
    } 
} 
} 

我收到的錯誤是： cse451.cpp：在功能 '無效createThreads（INT）'： cse451.cpp：99：21：錯誤：骨料'createThreads（INT）:: thread_data threadData具有不完整的類型和不能被定義 cse451.cpp：在函數 'void *冒泡（無效*）'： cse451.cpp：127：38：錯誤：不能轉換「冒泡（void *）:: thread_data *'到'threadData *'在作業中

我需要threadData來包含startIndex和stopIndex，它指向數組的邊界ch線程應該排序。看起來好像我的結構實現可能不正確，但我不確定爲什麼不。所有的幫助表示讚賞。

Answer 1

你定義struct threadData，但隨後試圖用型struct thread_data聲明一個變量命名threadData。

Answer 2

嘗試在結構中刪除startIndex後面的分號（;）。

struct threadData{ 
int thread_id; 
int stopIndex; 
int startIndex 
};