diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index 25e00f502..62c3487c4 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -90,7 +90,6 @@ extern "C" {
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
-#include <pthread.h>
 #include <setjmp.h>
 #include <assert.h>
 #include <umem.h>
@@ -123,6 +122,7 @@ extern "C" {
 #include <sys/rwlock.h>
 #include <sys/condvar.h>
 #include <sys/cmn_err.h>
+#include <sys/thread.h>
 #include <sys/zfs_delay.h>
 
 #include <sys/zfs_context_os.h>
@@ -176,53 +176,6 @@ extern "C" {
 #endif	/* DTRACE_PROBE4 */
 #define	DTRACE_PROBE4(a, b, c, d, e, f, g, h, i)
 
-/*
- * Threads.
- */
-typedef pthread_t	kthread_t;
-
-#define	TS_RUN		0x00000002
-#define	TS_JOINABLE	0x00000004
-
-#define	curthread	((void *)(uintptr_t)pthread_self())
-#define	getcomm()	"unknown"
-
-#define	thread_create_named(name, stk, stksize, func, arg, len, \
-    pp, state, pri)	\
-	zk_thread_create(name, func, arg, stksize, state)
-#define	thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
-	zk_thread_create(#func, func, arg, stksize, state)
-#define	thread_exit()	pthread_exit(NULL)
-#define	thread_join(t)	pthread_join((pthread_t)(t), NULL)
-
-#define	newproc(f, a, cid, pri, ctp, pid)	(ENOSYS)
-/*
- * Check if the current thread is a memory reclaim thread.
- * Always returns false in userspace (no memory reclaim thread).
- */
-#define	current_is_reclaim_thread()	(0)
-
-/* in libzpool, p0 exists only to have its address taken */
-typedef struct proc {
-	uintptr_t	this_is_never_used_dont_dereference_it;
-} proc_t;
-
-extern struct proc p0;
-#define	curproc		(&p0)
-
-#define	PS_NONE		-1
-
-extern kthread_t *zk_thread_create(const char *name, void (*func)(void *),
-    void *arg, size_t stksize, int state);
-
-#define	issig()		(FALSE)
-
-#define	KPREEMPT_SYNC		(-1)
-
-#define	kpreempt(x)		sched_yield()
-#define	kpreempt_disable()	((void)0)
-#define	kpreempt_enable()	((void)0)
-
 /*
  * Credentials
  */
diff --git a/lib/libspl/include/Makefile.am b/lib/libspl/include/Makefile.am
index e2c5f89ac..cc43493b1 100644
--- a/lib/libspl/include/Makefile.am
+++ b/lib/libspl/include/Makefile.am
@@ -57,6 +57,7 @@ libspl_sys_HEADERS = \
 	%D%/sys/string.h \
 	%D%/sys/sunddi.h \
 	%D%/sys/systeminfo.h \
+	%D%/sys/thread.h \
 	%D%/sys/time.h \
 	%D%/sys/timer.h \
 	%D%/sys/trace_spl.h \
diff --git a/lib/libspl/include/sys/thread.h b/lib/libspl/include/sys/thread.h
new file mode 100644
index 000000000..a5108a03d
--- /dev/null
+++ b/lib/libspl/include/sys/thread.h
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2012, Joyent, Inc. All rights reserved.
+ */
+
+#ifndef _SYS_THREAD_H
+#define	_SYS_THREAD_H
+
+#include <pthread.h>
+
+/*
+ * Threads.
+ */
+typedef pthread_t	kthread_t;
+
+#define	TS_RUN		0x00000002
+#define	TS_JOINABLE	0x00000004
+
+#define	curthread	((void *)(uintptr_t)pthread_self())
+#define	getcomm()	"unknown"
+
+#define	thread_create_named(name, stk, stksize, func, arg, len, \
+    pp, state, pri)	\
+	zk_thread_create(name, func, arg, stksize, state)
+#define	thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
+	zk_thread_create(#func, func, arg, stksize, state)
+#define	thread_exit()	pthread_exit(NULL)
+#define	thread_join(t)	pthread_join((pthread_t)(t), NULL)
+
+#define	newproc(f, a, cid, pri, ctp, pid)	(ENOSYS)
+/*
+ * Check if the current thread is a memory reclaim thread.
+ * Always returns false in userspace (no memory reclaim thread).
+ */
+#define	current_is_reclaim_thread()	(0)
+
+/* in libzpool, p0 exists only to have its address taken */
+typedef struct proc {
+	uintptr_t	this_is_never_used_dont_dereference_it;
+} proc_t;
+
+extern struct proc p0;
+#define	curproc		(&p0)
+
+#define	PS_NONE		-1
+
+extern kthread_t *zk_thread_create(const char *name, void (*func)(void *),
+    void *arg, size_t stksize, int state);
+
+#define	issig()		(FALSE)
+
+#define	KPREEMPT_SYNC		(-1)
+
+#define	kpreempt(x)		sched_yield()
+#define	kpreempt_disable()	((void)0)
+#define	kpreempt_enable()	((void)0)
+
+#endif /* _SYS_THREAD_H */