Include C test program in repo

2020-10-19 22:17:32 -06:00
parent 82126eca3c
commit d3a2cbd2b2
14 changed files with 940 additions and 56 deletions
@@ -0,0 +1,60 @@
+#pragma once
+//
+// From: http://roxlu.com/2014/047/high-resolution-timer-function-in-c-c--
+/* ----------------------------------------------------------------------- */
+/*
+  Easy embeddable cross-platform high resolution timer function. For each 
+  platform we select the high resolution timer. You can call the 'ns()' 
+  function in your file after embedding this. 
+*/
+#include <stdint.h>
+#if defined(__linux)
+#  define HAVE_POSIX_TIMER
+#  include <time.h>
+#  ifdef CLOCK_MONOTONIC
+#     define CLOCKID CLOCK_MONOTONIC
+#  else
+#     define CLOCKID CLOCK_REALTIME
+#  endif
+#elif defined(__APPLE__)
+#  define HAVE_MACH_TIMER
+#  include <mach/mach_time.h>
+#elif defined(_WIN32)
+#  define WIN32_LEAN_AND_MEAN
+#  include <windows.h>
+#endif
+static uint64_t ns_clock() {
+  static uint64_t is_init = 0;
+#if defined(__APPLE__)
+    static mach_timebase_info_data_t info;
+    if (0 == is_init) {
+      mach_timebase_info(&info);
+      is_init = 1;
+    }
+    uint64_t now;
+    now = mach_absolute_time();
+    now *= info.numer;
+    now /= info.denom;
+    return now;
+#elif defined(__linux)
+    static struct timespec linux_rate;
+    if (0 == is_init) {
+      clock_getres(CLOCKID, &linux_rate);
+      is_init = 1;
+    }
+    uint64_t now;
+    struct timespec spec;
+    clock_gettime(CLOCKID, &spec);
+    now = spec.tv_sec * 1.0e9 + spec.tv_nsec;
+    return now;
+#elif defined(_WIN32)
+    static LARGE_INTEGER win_frequency;
+    if (0 == is_init) {
+      QueryPerformanceFrequency(&win_frequency);
+      is_init = 1;
+    }
+    LARGE_INTEGER now;
+    QueryPerformanceCounter(&now);
+    return (uint64_t) ((1e9 * now.QuadPart)  / win_frequency.QuadPart);
+#endif
+}