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  1. #include <pthread.h>
  2. #include <atomic>
  3. #include <iostream>
  4. #include <sys/time.h>
  5.  
  6. double dwalltime() {
  7.     double sec;
  8.     struct timeval tv;
  9.  
  10.     gettimeofday(&tv,NULL);
  11.     sec = tv.tv_sec + tv.tv_usec/1000000.0;
  12.     return sec;
  13. }
  14.  
  15. #define ITERATIONS 100000000
  16.  
  17. int main() {
  18.     #ifdef USE_PTHREAD
  19.         std::cout << "Using pthread\n";
  20.         pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
  21.         unsigned counter(0);
  22.         double start = dwalltime();
  23.         for(unsigned i(0); i < ITERATIONS; ++i) {
  24.             pthread_mutex_lock(&mutex);
  25.             counter++;
  26.             pthread_mutex_unlock(&mutex);
  27.         }
  28.         double end = dwalltime();
  29.         std::cout << "It took me: " << (end - start) << " seconds\n";
  30.     #else
  31.         std::cout << "Using atomic\n";
  32.         std::atomic<unsigned> counter(0);
  33.         double start = dwalltime();
  34.         for(unsigned i(0); i < ITERATIONS; ++i)
  35.             counter++;
  36.         double end = dwalltime();
  37.         std::cout << "It took me: " << (end - start) << " seconds\n";
  38.     #endif
  39. }
  40.  
Success #stdin #stdout 0.82s 2884KB
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Standard input is empty
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Using atomic
It took me: 0.820415 seconds
https://ideone.com/4P1vO
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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