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  1. #include<stdio.h> 
  2. #include<pthread.h>
  3.  #include<semaphore.h>
  4.  sem_t semaphore; 
  5. void* process(void* arg) {   
  6.   sem_wait(&semaphore); 
  7.   printf("Process %d is in critical section\n", *(int*)arg);      
  8.  sleep(1); // simulate work      
  9. printf("Process %d is leaving critical section\n", *(int*)arg); sem_post(&semaphore);   
  10. return NULL; 
  11. } 
  12. int main() {   
  13.   pthread_t t1, t2;    
  14.  int id1 = 1, id2 = 2;   
  15.   sem_init(&semaphore, 0, 1);  
  16.   pthread_create(&t1, NULL, process, &id1);   
  17.   pthread_create(&t2, NULL, process, &id2);     
  18.   pthread_join(t1, NULL);     
  19.   pthread_join(t2, NULL);    
  20.   sem_destroy(&semaphore); 
  21.     return 0;  
  22.  
  23. } 
  24.  
  25.  
Success #stdin #stdout 0.01s 5276KB
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stdin
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Standard input is empty
stdout
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Process 2 is in critical section
Process 2 is leaving critical section
Process 1 is in critical section
Process 1 is leaving critical section
https://ideone.com/ZGX5ju
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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