From 977b7cbf371b5b005e14cbd141c59282c52e9893 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 23 Jun 2020 12:34:16 -0400
Subject: [PATCH] add jtk.time module

---
 src/jtk/jtk.c     | 25 +++++++++++++++++++++++++
 src/jtk/package.d |  1 +
 src/jtk/time.d    | 13 +++++++++++++
 3 files changed, 39 insertions(+)
 create mode 100644 src/jtk/time.d

diff --git a/src/jtk/jtk.c b/src/jtk/jtk.c
index 7007d26..3562e9c 100644
--- a/src/jtk/jtk.c
+++ b/src/jtk/jtk.c
@@ -4,12 +4,17 @@
 #include <stdlib.h>
 #include <GL/glx.h>
 #include <X11/Xatom.h>
+#include <sys/time.h>
 
 static Display * g_display;
 static XVisualInfo * g_vi;
 static XSetWindowAttributes g_swa;
 static GLXContext g_context;
 
+/**************************************************************************
+ * Init
+ *************************************************************************/
+
 /**
  * Initialize the Jtk subsystem.
  *
@@ -56,6 +61,26 @@ bool jtk_init()
     return true;
 }
 
+/**************************************************************************
+ * Time
+ *************************************************************************/
+
+/**
+ * Get system time in microseconds.
+ *
+ * @return System time in microseconds.
+ */
+uint64_t jtk_us_time()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return (uint64_t)tv.tv_sec * 1000000u + (uint64_t)tv.tv_usec;
+}
+
+/**************************************************************************
+ * Window
+ *************************************************************************/
+
 static Bool wait_for_notify(Display * display, XEvent * event, XPointer arg)
 {
     return (event->type == MapNotify) && (event->xmap.window == (Window)arg);
diff --git a/src/jtk/package.d b/src/jtk/package.d
index 6b1c35f..6acfb83 100644
--- a/src/jtk/package.d
+++ b/src/jtk/package.d
@@ -2,4 +2,5 @@ module jtk;
 
 public import jtk.event;
 public import jtk.init;
+public import jtk.time;
 public import jtk.window;
diff --git a/src/jtk/time.d b/src/jtk/time.d
new file mode 100644
index 0000000..29c6deb
--- /dev/null
+++ b/src/jtk/time.d
@@ -0,0 +1,13 @@
+module jtk.time;
+
+private extern(C) ulong jtk_us_time();
+
+ulong us_time()
+{
+    return jtk_us_time();
+}
+
+ulong ms_time()
+{
+    return us_time() / 1000u;
+}