34 lines
908 B
C
34 lines
908 B
C
#include <stdatomic.h>
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#include <stdio.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <dispatch/dispatch.h>
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atomic_int counter = 0; // shared resource
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dispatch_semaphore_t semaphore; // semaphore declaration
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void* increment(void* arg) {
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for (int i = 0; i < 100000; i++) {
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dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER); // lock
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atomic_fetch_add(&counter, 1); // critical section
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dispatch_semaphore_signal(semaphore); // unlock
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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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semaphore = dispatch_semaphore_create(1); // initialize semaphore with value 1
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pthread_create(&t1, NULL, increment, NULL);
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pthread_create(&t2, NULL, increment, NULL);
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pthread_join(t1, NULL);
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pthread_join(t2, NULL);
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dispatch_release(semaphore);
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printf("Final Counter Value (with semaphores): %d\n", atomic_load(&counter));
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return 0;
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}
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