Merge branch 'master' of https://github.com/hmage/system-bus-radio in…

…to hmage-master

* 'master' of https://github.com/hmage/system-bus-radio:
  Use absolute time as per PR#3.
  Fix compilation warning
  Compiles on both linux and mach
  add make clean target
  Fix compilation on 32bit
  Add makefile

Makefile

@@ -0,0 +1,8 @@
+CPPFLAGS=-Wall -O2 -msse2
+
+main: main.c
+
+.PHONY: clean
+
+clean:
+	rm -f main

main.c

@@ -4,10 +4,46 @@
 
 #include <stdio.h>
 #include <emmintrin.h>
+#include <inttypes.h>
+#include <time.h>
+#ifdef __MACH__
 #include <mach/mach_traps.h>
 #include <mach/mach_time.h>
+#endif
 #include <math.h>
 
+#ifndef NSEC_PER_SEC
+#define NSEC_PER_SEC 1000000000ull
+#endif
+
+#ifndef __MACH__
+#define TIME_ABSOLUTE CLOCK_REALTIME
+typedef struct timespec mach_timespec_t;
+typedef unsigned int mach_port_t;
+
+static inline uint64_t mach_absolute_time(void) {
+    mach_timespec_t tp;
+    int res = clock_gettime(CLOCK_REALTIME, &tp);
+    if (res < 0) {
+        perror("clock_gettime");
+        exit(1);
+    }
+    uint64_t result = tp.tv_sec * NSEC_PER_SEC;
+    result += tp.tv_nsec;
+    return result;
+}
+
+// non-conformant wrapper just for the purposes of this application
+static inline void clock_sleep_trap(mach_port_t clock_port, int sleep_type, time_t sec, long nsec, mach_timespec_t *remain) {
+    mach_timespec_t req = { sec, nsec };
+    int res = clock_nanosleep(sleep_type, TIMER_ABSTIME, &req, remain);
+    if (res < 0) {
+        perror("clock_nanosleep");
+        exit(1);
+    }
+}
+#endif // __MACH__
+
 __m128i reg;
 __m128i reg_zero;
 __m128i reg_one;
@@ -35,14 +71,16 @@ static inline void square_am_signal(float time, float frequency) {
 
 int main()
 {
+#ifdef __MACH__
     mach_timebase_info_data_t theTimeBaseInfo;
     mach_timebase_info(&theTimeBaseInfo);
     puts("TESTING TIME BASE: the following should be 1 / 1");
     printf("  Mach base: %u / %u nanoseconds\n\n", theTimeBaseInfo.numer, theTimeBaseInfo.denom);
+#endif
 
     uint64_t start = mach_absolute_time();
     uint64_t end = mach_absolute_time();
-    printf("TESTING TIME TO EXECUTE mach_absolute_time()\n  Result: %lld nanoseconds\n\n", end - start);
+    printf("TESTING TIME TO EXECUTE mach_absolute_time()\n  Result: %"PRIu64" nanoseconds\n\n", end - start);
 
     reg_zero = _mm_set_epi32(0, 0, 0, 0);
     reg_one = _mm_set_epi32(-1, -1, -1, -1);