From ad9cdb9b172ecd7acf5e55b60f3f77626d72f14f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 13 May 2021 09:02:17 +0200
Subject: Do lazy allocation of shadow task queues

---
 libbuild2/scheduler.hxx | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'libbuild2/scheduler.hxx')

diff --git a/libbuild2/scheduler.hxx b/libbuild2/scheduler.hxx
index b85d353..da3f0c0 100644
--- a/libbuild2/scheduler.hxx
+++ b/libbuild2/scheduler.hxx
@@ -700,6 +700,9 @@ namespace build2
     // tail, if enabled. If the mark is hit, then it is disabled until the
     // queue becomes empty or it is reset by a push.
     //
+    // Note also that the data array can be NULL (lazy allocation) and one
+    // must make sure it's allocated before calling push().
+    //
     struct task_queue_data
     {
       size_t head = 0;
-- 
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