Semafory

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Last updated: May 14, 2025

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Hint	Answer
Deklarace	struct Semaphore{
	int value;
	queue *q;
	bool locked;
	};
Inicializace	void init(struct Semaphore *s, unsigned value){
	s->value = value;
	s->locked = false;
	}
Lock Swap	void lock(struct Semaphore *s){
	bool key = true;
	while(key == true){
	swap(&(s->locked), &key);
	}
	s->value--;
	if(s->value < 0){
	process_t *p = get(ready_q);
	append(s->q, p);
	s->locked = false;
	switch();
	}
	else
	s->locked = false; }
Unlock Swap	void unlock(struct Semaphore *s){
	bool key = true;
	while(key == true){
	swap(&(s->locked), &key);
	}
	s->value++;
	if(s->value <= 0){
	process_t *p = get(s->q);

Hint	Answer
	append(ready_q, p);
	s->locked = false;
	}
	else
	s->locked = false;
	}
Lock TandS	void lock(struct Semaphore *s){
	while(TandS(s->locked))
	while(s->locked);
	s->value--;
	if(s->value < 0){
	process_t *p = get(ready_q);
	append(s->q, p);
	s->locked = false;
	switch();
	}
	else
	s->locked = false;
	}
Unlock TandS	void unlock(struct Semaphore *s){
	while(TandS(s->locked))
	while(s->locked);
	s->value++;
	if(s->value <= 0){
	process_t *p = get(s->q);
	append(ready_q, p);
	s->locked = false;
	}
	else
	s->locked = false;
	}

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