numeric-linalg

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#ifndef PROGRESS_BAR_H_
#define PROGRESS_BAR_H_

#include <stdio.h>
#include <stdint.h>
#include <pthread.h>

#define PROGRESS_BAR_LENGTH 50

/*
 * A thread-safe self-printing progress bar
 */
typedef struct {
  size_t          total;
  size_t          count;
  pthread_mutex_t mutex;
} ProgressBar;

void progress_bar_inc(ProgressBar *p)
{
  pthread_mutex_lock(&p->mutex);

  p->count++;
  size_t filled_length = (PROGRESS_BAR_LENGTH*p->count)/p->total;
  size_t empty_length = PROGRESS_BAR_LENGTH - filled_length;

  printf("\r[");
  for (size_t i = 0; i < filled_length; i++) printf("=");
  for (size_t i = 0; i < empty_length; i++)  printf(" ");

  size_t percent = (100*p->count)/p->total;
  printf("] %3zu%%", percent);
  if (percent == 100) printf("\n");

  fflush(stdout);
  pthread_mutex_unlock(&p->mutex);
}

#endif // PROGRESS_BAR_H_