D56384.id175465.diff
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	diff --git a/lib/libthr/libthr.3 b/lib/libthr/libthr.3
	--- a/lib/libthr/libthr.3
	+++ b/lib/libthr/libthr.3
	@@ -52,6 +52,12 @@
	and
	.Lb libc ;
	all three components must be built from the same source tree.
	+Together, they constitute the base for C runtime environment of
	+.Fx ,
	+running on top of the
	+.Fx
	+kernel.
	+.Pp
	Mixing
	.Li libc
	and
	@@ -263,6 +269,19 @@
	This should be taken into account when interpreting
	.Xr ktrace 1
	logs.
	+.Pp
	+The
	+.Nm
	+library uses the
	+.Va SIGTHR
	+signal for internal operations, in particular,
	+for the cancellation requests.
	+This signal masking and disposition is controlled by the library,
	+and user programs should not try to modify it.
	+The library interposes functions controlling signals, to prevent
	+inadvertent modifications, and to guard portable code against
	+knowing about
	+.Va SIGTHR .
	.Sh PROCESS-SHARED SYNCHRONIZATION OBJECTS
	In the
	.Li libthr