lib: Replace uhd::get_system_time() with steady_clock

Benchmarks show that using C++ chrono features beats
uhd::get_system_time(), and the latter is simply not appropriate unless
a uhd::time_spec_t is required.

1 files changed, 4 insertions, 3 deletions

diff --git a/host/lib/include/uhdlib/utils/atomic.hpp b/host/lib/include/uhdlib/utils/atomic.hpp
index 5436eea81..303df1bc9 100644
--- a/host/lib/include/uhdlib/utils/atomic.hpp
+++ b/host/lib/include/uhdlib/utils/atomic.hpp
@@ -10,9 +10,9 @@
 
 #include <uhd/config.hpp>
 #include <uhd/types/time_spec.hpp>
-#include <uhdlib/utils/system_time.hpp>
 #include <boost/thread/thread.hpp>
 #include <atomic>
+#include <chrono>
 
 namespace uhd{
 
@@ -31,9 +31,10 @@ namespace uhd{
         const double timeout
     ){
         if (cond == value) return true;
-        const time_spec_t exit_time = uhd::get_system_time() + time_spec_t(timeout);
+        const auto exit_time = std::chrono::high_resolution_clock::now()
+                               + std::chrono::microseconds(int64_t(timeout * 1e6));
         while (cond != value) {
-            if (uhd::get_system_time() > exit_time) {
+            if (std::chrono::high_resolution_clock::now() > exit_time) {
                 return false;
             }
             boost::this_thread::interruption_point();