Will statements after "return" keyword be executed?

Question

I'm C++ beginner, would like to know the impact of this scenario:

PCONSOLE_SCREEN_BUFFER_INFOEX GetConsoleInfo(void) {
    WaitForSingleObject(m_hSync);   // m_hSync is HANDLE to mutex created using CreateMutex()

    return m_pcsbi;    // m_pcsbi is of type PCONSOLE_SCREEN_BUFFER_INFOEX

    ReleaseMutex(m_hSync);      // <== will this line be executed?
}

Wonder will the [ReleaseMutex()] be executed?

Answer 1

There's no way to get to that code in your case. If you have a conditional return (e.g. if (ptr==nullptr) return; ) then there are of course conditions in which the return will be skipped. But an unconditional return will be the last of the statements executed.

However, RAII style cleanup does happen after return.

Answer 2

No, after a return statement, the destructors of the scope Objects will be called and the program will exit the function.

int main() { //Step 1
   GetConsoleInfo(); //2

   return (0); //6
}

PCONSOLE_SCREEN_BUFFER_INFOEX GetConsoleInfo(void) { //3
    WaitForSingleObject(m_hSync); //4

    return m_pcsbi; //5

    ReleaseMutex(m_hSync);
}

Maybe you should do something like :

int main() {
   WaitForSingleObject(m_hSync);
   GetConsoleInfo();
   ReleaseMutex(m_hSync);
   return (0);
}

PCONSOLE_SCREEN_BUFFER_INFOEX GetConsoleInfo(void) {
    return m_pcsbi;
}