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  1. #include <stdio.h>
  2. #include <pthread.h>
  3. #include <semaphore.h>
  4. #include <unistd.h>
  5.  
  6. // Define the semaphore and mutex
  7. sem_t room_sem;
  8. sem_t dr_sem;
  9. pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
  10.  
  11. void* patient(void* arg) {
  12.     int id = *(int*)arg;
  13.  
  14.     printf("User %d entered room 1\n", id);
  15.  
  16.     // Acquire the semaphore to limit the number of patients in room 1
  17.     sem_wait(&room_sem);
  18.  
  19.     printf("User %d measuring height\n", id);
  20.     // Simulating height measurement
  21.     sleep(1);
  22.     printf("User %d measuring weight\n", id);
  23.     // Simulating weight measurement
  24.     sleep(1);
  25.     printf("User %d leaving room 1\n", id);
  26.  
  27.     // Release the semaphore
  28.     sem_post(&room_sem);
  29.  
  30.     printf("User %d entering Dr. X's chamber\n", id);
  31.  
  32.     // Acquire the mutex to ensure only one patient consults with Dr. X at a time
  33.     pthread_mutex_lock(&mutex);
  34.     printf("User %d consulting with Dr. X\n", id);
  35.     // Simulating consultation
  36.     sleep(2);
  37.     printf("User %d leaving Dr. X's chamber\n", id);
  38.     pthread_mutex_unlock(&mutex);
  39.  
  40.     return NULL;
  41. }
  42.  
  43. int main() {
  44.     int n;
  45.     printf("Enter : ");
  46.     scanf("%d", &n);
  47.  
  48.     pthread_t patients[n];
  49.     int ids[n];
  50.  
  51.     sem_init(&room_sem, 0, n);
  52.     sem_init(&dr_sem, 0, 1);
  53.  
  54.     for (int i = 0; i < n; i++) {
  55.         ids[i] = i + 1;
  56.         pthread_create(&patients[i], NULL, patient, &ids[i]);
  57.     }
  58.  
  59.     for (int i = 0; i < n; i++) {
  60.         pthread_join(patients[i], NULL);
  61.     }
  62.  
  63.     sem_destroy(&room_sem);
  64.     sem_destroy(&dr_sem);
  65.     pthread_mutex_destroy(&mutex);
  66.  
  67.     return 0;
  68. }
  69.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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3
stdout
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Enter : User 3 entered room 1
User 3 measuring height
User 2 entered room 1
User 2 measuring height
User 1 entered room 1
User 1 measuring height
User 3 measuring weight
User 2 measuring weight
User 1 measuring weight
User 1 leaving room 1
User 1 entering Dr. X's chamber
User 1 consulting with Dr. X
User 2 leaving room 1
User 2 entering Dr. X's chamber
User 3 leaving room 1
User 3 entering Dr. X's chamber
User 1 leaving Dr. X's chamber
User 2 consulting with Dr. X
User 2 leaving Dr. X's chamber
User 3 consulting with Dr. X
User 3 leaving Dr. X's chamber
https://ideone.com/C980Oy
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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