From fe89c96185dba8ccf02b6b3d0994c2e149198c73 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Sun, 20 Oct 2013 13:52:09 +0100
Subject: [PATCH] Implemented a global decode lock to prevent concurrent decode

---
 pv/data/decoder.cpp | 4 ++++
 pv/data/decoder.h   | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/pv/data/decoder.cpp b/pv/data/decoder.cpp
index 8a84fd4d..133fcd19 100644
--- a/pv/data/decoder.cpp
+++ b/pv/data/decoder.cpp
@@ -43,6 +43,8 @@ const double Decoder::DecodeMargin = 1.0;
 const double Decoder::DecodeThreshold = 0.2;
 const int64_t Decoder::DecodeChunkLength = 4096;
 
+mutex Decoder::_global_decode_mutex;
+
 Decoder::Decoder(const srd_decoder *const dec,
 	std::map<const srd_probe*,
 		boost::shared_ptr<pv::view::LogicSignal> > probes,
@@ -191,6 +193,8 @@ void Decoder::decode_proc(shared_ptr<data::Logic> data)
 		!this_thread::interruption_requested() && i < sample_count;
 		i += DecodeChunkLength)
 	{
+		lock_guard<mutex> decode_lock(_global_decode_mutex);
+
 		const int64_t chunk_end = min(
 			i + DecodeChunkLength, sample_count);
 		snapshot->get_samples(chunk, i, chunk_end);
diff --git a/pv/data/decoder.h b/pv/data/decoder.h
index 09002ac9..b8608d2c 100644
--- a/pv/data/decoder.h
+++ b/pv/data/decoder.h
@@ -96,6 +96,15 @@ signals:
 	void new_decode_data();
 
 private:
+
+	/**
+	 * This mutex prevents more than one decode operation occuring
+	 * concurrently.
+	 * @todo A proper solution should be implemented to allow multiple
+	 * decode operations.
+	 */
+	static boost::mutex _global_decode_mutex;
+
 	const srd_decoder *const _decoder;
 	std::map<const srd_probe*, boost::shared_ptr<view::LogicSignal> >
 		_probes;
-- 
2.30.2