Index: share/man/man9/kproc.9
===================================================================
--- share/man/man9/kproc.9
+++ share/man/man9/kproc.9
@@ -179,11 +179,12 @@
 The
 .Fa ecode
 argument specifies the exit status of the process.
-While exiting, the function
-.Xr exit1 9
-will initiate a call to
-.Xr wakeup 9
-on the process handle.
+A
+.Fn wakeup
+is issued on the proc pointer which can be used by callers to know
+when the called function is no longer running.
+See the EXAMPLE section for how to use this to ensure that a module
+is unloaded safely.
 .Pp
 The
 .Fn kproc_resume ,
@@ -321,6 +322,40 @@
 	}
 }
 .Ed
+.Pp
+When the process is started as part of a module, the module needs to ensure
+that the module's code is no longer executing.
+.Bd -literal -offset indent
+struct mtx proc_interlock;
+volatile int proc_intervar;
+struct proc *procptr;		/* prointer from kproc_create */
+
+void
+kproc_fun(void *arg)
+{
+
+	for (;;) {
+		mtx_lock(&proc_interlock);
+		if (proc_intervar)
+			break;
+		mtx_unlock(&proc_interlock);
+
+		/* do work */
+	}
+
+	kproc_exit(0);
+}
+
+void
+unloadmod(void)
+{
+
+	mtx_lock(&proc_interlock);
+	proc_intervar = 1;
+	mtx_sleep(procptr, &proc_interlock, PDROP, "procexit", 0);
+	/* kproc_fun has returned, and module is safe to unload. */
+}
+.Ed
 .Sh ERRORS
 The
 .Fn kproc_resume