「「X`可在此功能未初始化」警告和並行線程，C

Question

下面的代碼產生以下警告： ‘factoryThread’ may be used uninitialized in this function [-Wmaybe-uninitialized]

pthread_t factoryThreads[NUM_FACTORIES]; 
    int factoryNums[NUM_FACTORIES]; 
    for (int i = 0; i < NUM_FACTORIES; i++) { 
     factoryNums[i] = i + 1; 
     pthread_t factoryThread; 
     factoryThreads[i] = factoryThread; 
     pthread_create(&factoryThreads[i], NULL, createAndInsertCandy, 
       &factoryNums[i]); 
    } 

代碼似乎按預期方式工作，但我仍然好奇，導致警告的原因以及我能做些什麼來解決這個問題。

Answer 1

您可以通過使用具有自動存儲時間，這是不確定的未初始化的變量的值調用未定義行爲，它只是發生工作。

刪除無意義的變量和賦值。

pthread_t factoryThreads[NUM_FACTORIES]; 
int factoryNums[NUM_FACTORIES]; 
for (int i = 0; i < NUM_FACTORIES; i++) { 
    factoryNums[i] = i + 1; 
    pthread_create(&factoryThreads[i], NULL, createAndInsertCandy, 
      &factoryNums[i]); 
}