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-rw-r--r--lib/libc/sys/brk.27
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/libc/sys/brk.2 b/lib/libc/sys/brk.2
index a5247c9227d9..fc10e2ccf65a 100644
--- a/lib/libc/sys/brk.2
+++ b/lib/libc/sys/brk.2
@@ -28,7 +28,7 @@
.\" @(#)brk.2 8.4 (Berkeley) 5/1/95
.\" $FreeBSD$
.\"
-.Dd May 24, 2018
+.Dd June 2, 2018
.Dt BRK 2
.Os
.Sh NAME
@@ -183,3 +183,8 @@ is sometimes used to monitor heap use by calling with an argument of 0.
The result is unlikely to reflect actual utilization in combination with an
.Xr mmap 2
based malloc.
+.Pp
+.Fn brk
+and
+.Fn sbrk
+are not thread-safe.