当线程退出时，线程中声明的变量会发生什么？

Question

Here is an example of a thread.

void* thrfun(void* arg)
{
    int var;
    var = 7;
    
    
    pthread_exit(NULL);
}

What happens to var when it exits. Is var de allocated, or is var still sitting in memory as a leak?

Is a thread function simply still a function, and all variables inside are local, meaning they get de allocated upon exit?

Answer 1

The local variables declared in thrfun(void* arg) are placed on the thread's stack (if the system has a stack) and will be released as soon as the function returns, just like with any other function.

Is var de allocated, or is var still sitting in memory as a leak?

The memory claimed by var will be released.

If you instead do manual memory allocation, with malloc for example, that memory remains allocated (on the heap, if the system has a heap) until you free it, also just like with any other function.