Use less CPU in goma

Only re-draw when something changes and update once per 5 sec

1 files changed, 13 insertions, 3 deletions

diff --git a/src/goma.cc b/src/goma.cc
index c82920d..47f0a43 100644
--- a/src/goma.cc
+++ b/src/goma.cc
@@ -28,6 +28,14 @@ struct State {
   std::string msg_;
   uint64_t running_{0};
   uint64_t failed_{0};
+
+  bool operator==(State const& state) const {
+    if (error_ != state.error_)
+      return false;
+    if (error_)
+      return msg_ == state.msg_;
+    return running_ == state.running_ && failed_ == state.failed_;
+  }
 };
 
 class GomaPoll {
@@ -86,9 +94,11 @@ private:
 
       {
         std::unique_lock<std::mutex> lock(mutex_);
-        state_ = state;
-        io::write(pipe_, "s", 1);
-        cond_.wait_for(lock, std::chrono::seconds(1));
+        if (!(state_ == state)) {
+          state_ = state;
+          io::write(pipe_, "s", 1);
+        }
+        cond_.wait_for(lock, std::chrono::seconds(5));
         if (quit_)
           break;
       }