Implement decode pausing/resuming

[pulseview.git] / pv / data / decodesignal.cpp

diff --git a/pv/data/decodesignal.cpp b/pv/data/decodesignal.cpp
index 05dc3428ab5ce8e9f2bcb964175b55fceb3557d2..4705b104542cef6c9875d8fa7e1922b6b6cae0c8 100644 (file)
--- a/pv/data/decodesignal.cpp
+++ b/pv/data/decodesignal.cpp
@@ -151,6 +151,9 @@ void DecodeSignal::reset_decode(bool shutting_down)
                logic_mux_thread_.join();
        }
 
+       decode_pause_mutex_.unlock();
+       decode_paused_ = false;
+
        class_rows_.clear();
        current_segment_id_ = 0;
        segments_.clear();
@@ -258,6 +261,25 @@ void DecodeSignal::begin_decode()
        decode_thread_ = std::thread(&DecodeSignal::decode_proc, this);
 }
 
+void DecodeSignal::pause_decode()
+{
+       decode_paused_ = true;
+}
+
+void DecodeSignal::resume_decode()
+{
+       // Manual unlocking is done before notifying, to avoid waking up the
+       // waiting thread only to block again (see notify_one for details)
+       decode_pause_mutex_.unlock();
+       decode_pause_cond_.notify_one();
+       decode_paused_ = false;
+}
+
+bool DecodeSignal::is_paused() const
+{
+       return decode_paused_;
+}
+
 QString DecodeSignal::error_message() const
 {
        lock_guard<mutex> lock(output_mutex_);
@@ -981,6 +1003,11 @@ void DecodeSignal::decode_data(
                // Notify the frontend that we processed some data and
                // possibly have new annotations as well
                new_annotations();
+
+               if (decode_paused_) {
+                       unique_lock<mutex> pause_wait_lock(decode_pause_mutex_);
+                       decode_pause_cond_.wait(pause_wait_lock);
+               }
        }
 }