55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
#include <stdio.h>
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#include <stdatomic.h>
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#include <pthread.h>
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atomic_int lock = 0; //원자적 변수
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int counter = 5;
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int TestAndSet(atomic_int *target){
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// atomic으로 비슷하게 흉내.
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// 어셈블리어 수준의 원자적 표현이 없음
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return atomic_exchange(target, 1);
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}
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void acquire_lock(atomic_int *lock){
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while(TestAndSet(lock) == 1){
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// 바쁜대기중...
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}
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}
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void release_lock(atomic_int *lock){
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atomic_store(lock, 0);
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}
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void* producer(void* arg){
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for(int i = 0; i < 1000000; i++){
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acquire_lock(&lock);
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counter++;
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release_lock(&lock);
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}
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return NULL;
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}
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void *consumer(void* arg){
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for(int i = 0; i < 1000000; i++){
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acquire_lock(&lock);
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counter--;
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release_lock(&lock);
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}
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return NULL;
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}
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int main(){
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pthread_t t1, t2;
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pthread_create(&t1, NULL, producer, NULL);
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pthread_create(&t2, NULL, consumer, NULL);
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pthread_join(t1, NULL);
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pthread_join(t2, NULL);
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printf("최종 Counter 값 : %d\n", counter);
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return 0;
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} |