+
+#elif defined(__APPLE__)
+
+#include <mach/mach.h>
+#include <mach/clock.h>
+#include <mach/mach_time.h>
+#include <time.h>
+#include <stdint.h>
+
+typedef uint64_t caa_cycles_t;
+
+static inline caa_cycles_t caa_get_cycles (void)
+{
+ mach_timespec_t ts = { 0, 0 };
+ static clock_serv_t clock_service;
+
+ if (caa_unlikely(!clock_service)) {
+ if (host_get_clock_service(mach_host_self(),
+ SYSTEM_CLOCK, &clock_service))
+ return -1ULL;
+ }
+ if (caa_unlikely(clock_get_time(clock_service, &ts)))
+ return -1ULL;
+ return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
+}
+
+#else
+
+#error caa_get_cycles() not implemented for this platform.
+
+#endif
+