add cgaebel/pipe tracking lock_free

The reason to use the branch `lock_free` is because the `master` has the issue of not blocking on `pipe_push()` when a pipe is full. See cgaebel/pipe#6 (comment)
1pakch · May 1, 2018 · 8ef7eb1 · 8ef7eb1
1 parent d9a190b
commit 8ef7eb1
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diff --git a/.gitmodules b/.gitmodules
@@ -2,3 +2,7 @@
 	path = minimap2
 	url = [email protected]:lh3/minimap2.git
 	branch = master
+[submodule "pipe"]
+	path = pipe
+	url = [email protected]:cgaebel/pipe.git
+	branch = lock_free
diff --git a/pipe b/pipe