make multi threaded compression configurable and use single threaded

by default.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libutil/compression.hh b/src/libutil/compression.hh
index e3e6f5a993..a0d7530d74 100644
--- a/src/libutil/compression.hh
+++ b/src/libutil/compression.hh
@@ -8,7 +8,7 @@
 
 namespace nix {
 
-ref<std::string> compress(const std::string & method, const std::string & in);
+ref<std::string> compress(const std::string & method, const std::string & in, const bool parallel = false);
 
 ref<std::string> decompress(const std::string & method, const std::string & in);
 
@@ -17,7 +17,7 @@ struct CompressionSink : BufferedSink
     virtual void finish() = 0;
 };
 
-ref<CompressionSink> makeCompressionSink(const std::string & method, Sink & nextSink);
+ref<CompressionSink> makeCompressionSink(const std::string & method, Sink & nextSink, const bool parallel = false);
 
 MakeError(UnknownCompressionMethod, Error);