15 replies

please I have a question

Hi guys please I have this question

// ga is a global variable

int func_a() {
    int a = ga;
    return a>2 ? a-2 : 2-a;
}

int func_b() {
    return ga>2 ? ga-2 : 2-ga;
}

// ga is a global variable

int func_a() {
    int a = ga;
    return a>2 ? a-2 : 2-a;
}

int func_b() {
    return ga>2 ? ga-2 : 2-ga;
}

Are these two code snippets functionally identical in a multi-threaded or real-time operating system (RTOS) environment? Specifically, is the first code guaranteed to safely read the global variable

ga

ga

only once, ensuring consistent behavior even if

ga

ga

changes? This is not about data protection mechanisms like locks, but rather compiler behavior regarding register assignment and variable reading.
@Middleware & OS

EdgeBench•2y ago•

15 replies

Marvee Amasi

please I have a question

Hi guys please I have this question

// ga is a global variable

int func_a() {
    int a = ga;
    return a>2 ? a-2 : 2-a;
}

int func_b() {
    return ga>2 ? ga-2 : 2-ga;
}

// ga is a global variable

int func_a() {
    int a = ga;
    return a>2 ? a-2 : 2-a;
}

int func_b() {
    return ga>2 ? ga-2 : 2-ga;
}

Are these two code snippets functionally identical in a multi-threaded or real-time operating system (RTOS) environment? Specifically, is the first code guaranteed to safely read the global variable

ga

ga

only once, ensuring consistent behavior even if

ga

ga

changes? This is not about data protection mechanisms like locks, but rather compiler behavior regarding register assignment and variable reading.
@Middleware & OS

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please I have a question

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