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  1. #include <iostream>
  2. #include <pthread.h>
  3. #include <semaphore.h>
  4. #include <unistd.h>
  5.  
  6. sem_t printerSemaphore;  // Semaphore for shared printer
  7.  
  8. void* usePrinter(void* arg) {
  9.     int id = *((int*)arg);
  10.  
  11.     sem_wait(&printerSemaphore);  // Wait (P operation)
  12.     std::cout << "Process " << id << " is using the printer...\n";
  13.     sleep(2);  // Simulate using the printer
  14.     std::cout << "Process " << id << " is done printing.\n";
  15.     sem_post(&printerSemaphore);  // Signal (V operation)
  16.  
  17.     return nullptr;
  18. }
  19.  
  20. int main() {
  21.     pthread_t t1, t2;
  22.     int id1 = 1, id2 = 2;
  23.  
  24.     sem_init(&printerSemaphore, 0, 1);  // Binary semaphore initialized to 1
  25.  
  26.     pthread_create(&t1, nullptr, usePrinter, &id1);
  27.     pthread_create(&t2, nullptr, usePrinter, &id2);
  28.  
  29.     pthread_join(t1, nullptr);
  30.     pthread_join(t2, nullptr);
  31.  
  32.     sem_destroy(&printerSemaphore);
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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Process 2 is using the printer...
Process 2 is done printing.
Process 1 is using the printer...
Process 1 is done printing.
https://ideone.com/mr6ATV
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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