1 files changed, 48 insertions, 0 deletions
diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..b0f36fa
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,48 @@
+/*
+ * 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/>.
+ */
+
+#include "utils.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <threads.h>
+#include <time.h>
+
+static once_flag g_once_flag = ONCE_FLAG_INIT;
+static mtx_t g_log_mutex;
+
+static void InitLogMutex() {
+  if (mtx_init(&g_log_mutex, mtx_plain) != thrd_success) abort();
+}
+
+void LogImpl(const char* fmt, ...) {
+  call_once(&g_once_flag, InitLogMutex);
+  int status = mtx_lock(&g_log_mutex);
+  va_list args;
+  va_start(args, fmt);
+  vfprintf(stderr, fmt, args);
+  va_end(args);
+  if (status == thrd_success) mtx_unlock(&g_log_mutex);
+}
+
+unsigned long long MillisNow(void) {
+  struct timespec ts = {.tv_sec = 0, .tv_nsec = 0};
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (unsigned long long)ts.tv_sec * 1000ull +
+         (unsigned long long)ts.tv_nsec / 1000000ull;
+}