Add perf unit to toolbox

2 files changed, 81 insertions, 0 deletions

diff --git a/perf.c b/perf.c
new file mode 100644
index 0000000..e5ad57b
--- /dev/null
+++ b/perf.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2023 Mikhail Burakov. This file is part of toolbox.
+ *
+ * toolbox is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * toolbox is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with toolbox.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "perf.h"
+
+#include <limits.h>
+#include <time.h>
+
+unsigned long long MicrosNow(void) {
+  struct timespec ts = {.tv_sec = 0, .tv_nsec = 0};
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (unsigned long long)ts.tv_sec * 1000000ull +
+         (unsigned long long)ts.tv_nsec / 1000ull;
+}
+
+void TimingStatsReset(struct TimingStats* timing_stats) {
+  *timing_stats = (struct TimingStats){.min = ULLONG_MAX};
+}
+
+void TimingStatsRecord(struct TimingStats* timing_stats,
+                       unsigned long long value) {
+  if (value < timing_stats->min) timing_stats->min = value;
+  if (value > timing_stats->max) timing_stats->max = value;
+  timing_stats->sum += value;
+  timing_stats->counter++;
+}
diff --git a/perf.h b/perf.h
new file mode 100644
index 0000000..5adc5c0
--- /dev/null
+++ b/perf.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2022 Mikhail Burakov. This file is part of toolbox.
+ *
+ * toolbox is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * toolbox is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with toolbox.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef TOOLBOX_PERF_H_
+#define TOOLBOX_PERF_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+struct TimingStats {
+  unsigned long long min;
+  unsigned long long max;
+  unsigned long long sum;
+  unsigned long long counter;
+};
+
+unsigned long long MicrosNow(void);
+void TimingStatsReset(struct TimingStats* timing_stats);
+void TimingStatsRecord(struct TimingStats* timing_stats,
+                       unsigned long long value);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // TOOLBOX_PERF_H_