////////////////////////////////////////////////////////////
//~ Profile zone

// void PushProfZoneEx(char *name_cstr_lit, b32 end_zone)
// {
//   ProfTrack *track = Base_tl.prof.thread_track;
//   if (!track)
//   {
//     Arena *perm = PermArena();
//     {
//       track = PushStruct(perm, ProfTrack);
//       Base_tl.prof.thread_track = track;
//     }
//     LockTicketMutex(&Base.prof.register_track_tm);
//     {
//       Base_tl.prof.track_idx = Atomic32Fetch(&Base.prof.tracks_count);
//       Base.prof.tracks[Base_tl.prof.track_idx] = track;
//       Atomic32FetchAdd(&Base.prof.tracks_count, 1);
//     }
//     UnlockTicketMutex(&Base.prof.register_track_tm);
//   }

//   u64 sample_seq = track->top_sample_seq;
//   ProfSample *sample = &track->samples[sample_seq % ProfTrackSamplesCap];
//   {
//     // TODO: Wrap rdtsc for cpu-relative <-> program-relative timestamp conversion
//     sample->stamp = __rdtsc() | ((u64)(!!end_zone) << 63);
//     // sample->stamp = TimeNs() | ((u64)(!!end_zone) << 63);
//     sample->name_cstr_lit = name_cstr_lit;
//   }
//   track->top_sample_seq = sample_seq + 1;
// }



void BeginProfZone(char *name_cstr_lit)
{
  ProfTrack *track = Base_tl.prof.thread_track;
  if (!track)
  {
    Arena *perm = PermArena();
    {
      track = PushStruct(perm, ProfTrack);
      Base_tl.prof.thread_track = track;
    }
    LockTicketMutex(&Base.prof.register_track_tm);
    {
      u64 track_idx = Atomic32Fetch(&Base.prof.tracks_count);
      Base.prof.tracks[track_idx] = track;
      track->id = track_idx;
      Atomic32FetchAdd(&Base.prof.tracks_count, 1);
    }
    UnlockTicketMutex(&Base.prof.register_track_tm);
  }
  u64 sample_seq = *NonAtomic(&track->top_sample_seq);
  ProfSample *sample = &track->samples[sample_seq % ProfTrackSamplesCap];
  {
    sample->flags = 0;
    sample->name_cstr_lit = name_cstr_lit;
    sample->tsc = BeginTsc();
  }
  Atomic64Set(&track->top_sample_seq, sample_seq + 1);
}

void EndProfZone(void)
{
  i64 tsc = EndTsc();
  ProfTrack *track = Base_tl.prof.thread_track;
  u64 sample_seq = *NonAtomic(&track->top_sample_seq);
  ProfSample *sample = &track->samples[sample_seq % ProfTrackSamplesCap];
  {
    sample->flags = ProfSampleFlag_EndZone;
    sample->tsc = tsc;
    sample->name_cstr_lit = 0;
  }
  Atomic64Set(&track->top_sample_seq, sample_seq + 1);
}

////////////////////////////////////////////////////////////
//~ Retrieve tracks

RegisteredProfTracksArray FetchRegisteredProfTracks(Arena *arena)
{
  RegisteredProfTracksArray result = Zi;
  {
    result.count = Atomic32Fetch(&Base.prof.tracks_count);
    result.tracks = PushStructsNoZero(arena, ProfTrack *, result.count);
    for (u64 track_idx = 0; track_idx < result.count; ++track_idx)
    {
      result.tracks[track_idx] = Base.prof.tracks[track_idx];
    }
  }
  return result;
}