diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c
index dc34d2d8e6..912415faba 100644
--- a/cmd/ztest/ztest.c
+++ b/cmd/ztest/ztest.c
@@ -140,7 +140,7 @@ typedef struct ztest_args {
 	spa_t		*za_spa;
 	objset_t	*za_os;
 	zilog_t		*za_zilog;
-	pthread_t	za_thread;
+	kthread_t	*za_thread;
 	uint64_t	za_instance;
 	uint64_t	za_random;
 	uint64_t	za_diroff;
@@ -231,7 +231,7 @@ ztest_info_t ztest_info[] = {
  * The callbacks are ordered by txg number.
  */
 typedef struct ztest_cb_list {
-	pthread_mutex_t		zcl_callbacks_lock;
+	kmutex_t		zcl_callbacks_lock;
 	list_t			zcl_callbacks;
 } ztest_cb_list_t;
 
@@ -239,8 +239,8 @@ typedef struct ztest_cb_list {
  * Stuff we need to share writably between parent and child.
  */
 typedef struct ztest_shared {
-	pthread_mutex_t		zs_vdev_lock;
-	pthread_rwlock_t	zs_name_lock;
+	kmutex_t		zs_vdev_lock;
+	krwlock_t		zs_name_lock;
 	uint64_t		zs_vdev_primaries;
 	uint64_t		zs_vdev_aux;
 	uint64_t		zs_enospc_count;
@@ -249,7 +249,7 @@ typedef struct ztest_shared {
 	uint64_t		zs_alloc;
 	uint64_t		zs_space;
 	ztest_info_t		zs_info[ZTEST_FUNCS];
-	pthread_mutex_t		zs_sync_lock[ZTEST_SYNC_LOCKS];
+	kmutex_t		zs_sync_lock[ZTEST_SYNC_LOCKS];
 	uint64_t		zs_seq[ZTEST_SYNC_LOCKS];
 	ztest_cb_list_t		zs_cb_list;
 } ztest_shared_t;
@@ -825,7 +825,7 @@ ztest_spa_create_destroy(ztest_args_t *za)
 	 * Attempt to create an existing pool.  It shouldn't matter
 	 * what's in the nvroot; we should fail with EEXIST.
 	 */
-	(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 	nvroot = make_vdev_root("/dev/bogus", NULL, 0, 0, 0, 0, 0, 1);
 	error = spa_create(za->za_pool, nvroot, NULL, NULL, NULL);
 	nvlist_free(nvroot);
@@ -841,7 +841,7 @@ ztest_spa_create_destroy(ztest_args_t *za)
 		fatal(0, "spa_destroy() = %d", error);
 
 	spa_close(spa, FTAG);
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 static vdev_t *
@@ -872,7 +872,7 @@ ztest_vdev_add_remove(ztest_args_t *za)
 	nvlist_t *nvroot;
 	int error;
 
-	(void) pthread_mutex_lock(&ztest_shared->zs_vdev_lock);
+	mutex_enter(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -890,7 +890,7 @@ ztest_vdev_add_remove(ztest_args_t *za)
 	error = spa_vdev_add(spa, nvroot);
 	nvlist_free(nvroot);
 
-	(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+	mutex_exit(&ztest_shared->zs_vdev_lock);
 
 	if (error == ENOSPC)
 		ztest_record_enospc("spa_vdev_add");
@@ -919,7 +919,7 @@ ztest_vdev_aux_add_remove(ztest_args_t *za)
 		aux = ZPOOL_CONFIG_L2CACHE;
 	}
 
-	(void) pthread_mutex_lock(&ztest_shared->zs_vdev_lock);
+	mutex_enter(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -975,7 +975,7 @@ ztest_vdev_aux_add_remove(ztest_args_t *za)
 			fatal(0, "spa_vdev_remove(%llu) = %d", guid, error);
 	}
 
-	(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+	mutex_exit(&ztest_shared->zs_vdev_lock);
 }
 
 /*
@@ -1001,7 +1001,7 @@ ztest_vdev_attach_detach(ztest_args_t *za)
 	int oldvd_is_log;
 	int error, expected_error;
 
-	(void) pthread_mutex_lock(&ztest_shared->zs_vdev_lock);
+	mutex_enter(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -1061,7 +1061,7 @@ ztest_vdev_attach_detach(ztest_args_t *za)
 		if (error != 0 && error != ENODEV && error != EBUSY &&
 		    error != ENOTSUP)
 			fatal(0, "detach (%s) returned %d", oldpath, error);
-		(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+		mutex_exit(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 
@@ -1154,7 +1154,7 @@ ztest_vdev_attach_detach(ztest_args_t *za)
 		    (longlong_t)newsize, replacing, error, expected_error);
 	}
 
-	(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+	mutex_exit(&ztest_shared->zs_vdev_lock);
 }
 
 /*
@@ -1259,7 +1259,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 	size_t psize, newsize;
 	uint64_t spa_newsize, spa_cursize, ms_count;
 
-	(void) pthread_mutex_lock(&ztest_shared->zs_vdev_lock);
+	mutex_enter(&ztest_shared->zs_vdev_lock);
 	mutex_enter(&spa_namespace_lock);
 	spa_config_enter(spa, SCL_STATE, spa, RW_READER);
 
@@ -1287,7 +1287,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 	if (psize == 0 || psize >= 4 * zopt_vdev_size) {
 		spa_config_exit(spa, SCL_STATE, spa);
 		mutex_exit(&spa_namespace_lock);
-		(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+		mutex_exit(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 	ASSERT(psize > 0);
@@ -1316,7 +1316,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 		}
 		(void) spa_config_exit(spa, SCL_STATE, spa);
 		mutex_exit(&spa_namespace_lock);
-		(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+		mutex_exit(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 
@@ -1356,7 +1356,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 		    spa->spa_name, oldnumbuf, newnumbuf);
 	}
 	spa_config_exit(spa, SCL_STATE, spa);
-	(void) pthread_mutex_unlock(&ztest_shared->zs_vdev_lock);
+	mutex_exit(&ztest_shared->zs_vdev_lock);
 }
 
 /* ARGSUSED */
@@ -1455,7 +1455,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	uint64_t seq;
 	uint64_t objects;
 
-	(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 	(void) snprintf(name, 100, "%s/%s_temp_%llu", za->za_pool, za->za_pool,
 	    (u_longlong_t)za->za_instance);
 
@@ -1498,7 +1498,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	if (error) {
 		if (error == ENOSPC) {
 			ztest_record_enospc("dmu_objset_create");
-			(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+			rw_exit(&ztest_shared->zs_name_lock);
 			return;
 		}
 		fatal(0, "dmu_objset_create(%s) = %d", name, error);
@@ -1580,7 +1580,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	if (error)
 		fatal(0, "dmu_objset_destroy(%s) = %d", name, error);
 
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -1594,7 +1594,7 @@ ztest_dmu_snapshot_create_destroy(ztest_args_t *za)
 	char snapname[100];
 	char osname[MAXNAMELEN];
 
-	(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 	dmu_objset_name(os, osname);
 	(void) snprintf(snapname, 100, "%s@%llu", osname,
 	    (u_longlong_t)za->za_instance);
@@ -1608,7 +1608,7 @@ ztest_dmu_snapshot_create_destroy(ztest_args_t *za)
 		ztest_record_enospc("dmu_take_snapshot");
 	else if (error != 0 && error != EEXIST)
 		fatal(0, "dmu_take_snapshot() = %d", error);
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -1670,7 +1670,7 @@ ztest_dsl_dataset_promote_busy(ztest_args_t *za)
 	char osname[MAXNAMELEN];
 	uint64_t curval = za->za_instance;
 
-	(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 
 	dmu_objset_name(os, osname);
 	ztest_dsl_dataset_cleanup(osname, curval);
@@ -1760,7 +1760,7 @@ ztest_dsl_dataset_promote_busy(ztest_args_t *za)
 out:
 	ztest_dsl_dataset_cleanup(osname, curval);
 
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -2568,7 +2568,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	int bs = ZTEST_DIROBJ_BLOCKSIZE;
 	int do_free = 0;
 	uint64_t off, txg, txg_how;
-	pthread_mutex_t *lp;
+	kmutex_t *lp;
 	char osname[MAXNAMELEN];
 	char iobuf[SPA_MAXBLOCKSIZE];
 	blkptr_t blk;
@@ -2631,7 +2631,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	txg = dmu_tx_get_txg(tx);
 
 	lp = &ztest_shared->zs_sync_lock[b];
-	(void) pthread_mutex_lock(lp);
+	mutex_enter(lp);
 
 	wbt->bt_objset = dmu_objset_id(os);
 	wbt->bt_object = ZTEST_DIROBJ;
@@ -2688,7 +2688,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 		dmu_buf_rele(bonus_db, FTAG);
 	}
 
-	(void) pthread_mutex_unlock(lp);
+	mutex_exit(lp);
 
 	if (ztest_random(1000) == 0)
 		(void) poll(NULL, 0, 1); /* open dn_notxholds window */
@@ -2707,13 +2707,13 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	/*
 	 * dmu_sync() the block we just wrote.
 	 */
-	(void) pthread_mutex_lock(lp);
+	mutex_enter(lp);
 
 	blkoff = P2ALIGN_TYPED(off, bs, uint64_t);
 	error = dmu_buf_hold(os, ZTEST_DIROBJ, blkoff, FTAG, &db);
 	za->za_dbuf = db;
 	if (error) {
-		(void) pthread_mutex_unlock(lp);
+		mutex_exit(lp);
 		return;
 	}
 	blkoff = off - blkoff;
@@ -2722,18 +2722,18 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	za->za_dbuf = NULL;
 
 	if (error) {
-		(void) pthread_mutex_unlock(lp);
+		mutex_exit(lp);
 		return;
 	}
 
 	if (blk.blk_birth == 0)	{	/* concurrent free */
-		(void) pthread_mutex_unlock(lp);
+		mutex_exit(lp);
 		return;
 	}
 
 	txg_suspend(dmu_objset_pool(os));
 
-	(void) pthread_mutex_unlock(lp);
+	mutex_exit(lp);
 
 	ASSERT(blk.blk_fill == 1);
 	ASSERT3U(BP_GET_TYPE(&blk), ==, DMU_OT_UINT64_OTHER);
@@ -3144,9 +3144,9 @@ ztest_commit_callback(void *arg, int error)
 	ASSERT3U(data->zcd_txg, !=, 0);
 
 	/* Remove our callback from the list */
-	(void) pthread_mutex_lock(&zcl->zcl_callbacks_lock);
+	mutex_enter(&zcl->zcl_callbacks_lock);
 	list_remove(&zcl->zcl_callbacks, data);
-	(void) pthread_mutex_unlock(&zcl->zcl_callbacks_lock);
+	mutex_exit(&zcl->zcl_callbacks_lock);
 
 out:
 	umem_free(data, sizeof (ztest_cb_data_t));
@@ -3234,8 +3234,8 @@ ztest_dmu_commit_callbacks(ztest_args_t *za)
 	/*
 	 * Read existing data to make sure there isn't a future leak.
 	 */
-	VERIFY(0 == dmu_read(os, ZTEST_DIROBJ, za->za_diroff, sizeof (uint64_t),
-	    &old_txg));
+	VERIFY(0 == dmu_read(os, ZTEST_DIROBJ, za->za_diroff,
+			     sizeof (uint64_t), &old_txg, DMU_READ_PREFETCH));
 
 	if (old_txg > txg)
 		fatal(0, "future leak: got %llx, open txg is %llx", old_txg,
@@ -3243,7 +3243,7 @@ ztest_dmu_commit_callbacks(ztest_args_t *za)
 
 	dmu_write(os, ZTEST_DIROBJ, za->za_diroff, sizeof (uint64_t), &txg, tx);
 
-	(void) pthread_mutex_lock(&zcl->zcl_callbacks_lock);
+	mutex_enter(&zcl->zcl_callbacks_lock);
 
 	/*
 	 * Since commit callbacks don't have any ordering requirement and since
@@ -3288,7 +3288,7 @@ ztest_dmu_commit_callbacks(ztest_args_t *za)
 		tmp_cb = cb_data[i];
 	}
 
-	(void) pthread_mutex_unlock(&zcl->zcl_callbacks_lock);
+	mutex_exit(&zcl->zcl_callbacks_lock);
 
 	dmu_tx_commit(tx);
 }
@@ -3304,7 +3304,7 @@ ztest_dsl_prop_get_set(ztest_args_t *za)
 	char osname[MAXNAMELEN];
 	int error;
 
-	(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 
 	dmu_objset_name(os, osname);
 
@@ -3343,7 +3343,7 @@ ztest_dsl_prop_get_set(ztest_args_t *za)
 		}
 	}
 
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -3507,7 +3507,7 @@ ztest_spa_rename(ztest_args_t *za)
 	int error;
 	spa_t *spa;
 
-	(void) pthread_rwlock_wrlock(&ztest_shared->zs_name_lock);
+	rw_enter(&ztest_shared->zs_name_lock, RW_WRITER);
 
 	oldname = za->za_pool;
 	newname = umem_alloc(strlen(oldname) + 5, UMEM_NOFAIL);
@@ -3559,7 +3559,7 @@ ztest_spa_rename(ztest_args_t *za)
 
 	umem_free(newname, strlen(newname) + 1);
 
-	(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+	rw_exit(&ztest_shared->zs_name_lock);
 }
 
 
@@ -3888,19 +3888,19 @@ ztest_run(char *pool)
 	ztest_args_t *za;
 	spa_t *spa;
 	char name[100];
-	pthread_t resume_tid;
+	kthread_t *resume_thread;
 
 	ztest_exiting = B_FALSE;
 
-	(void) pthread_mutex_init(&zs->zs_vdev_lock, NULL);
-	(void) pthread_rwlock_init(&zs->zs_name_lock, NULL);
-	(void) pthread_mutex_init(&zs->zs_cb_list.zcl_callbacks_lock, NULL);
+	mutex_init(&zs->zs_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
+	rw_init(&zs->zs_name_lock, NULL, RW_DEFAULT, NULL);
+	mutex_init(&zs->zs_cb_list.zcl_callbacks_lock,NULL,MUTEX_DEFAULT,NULL);
 
 	list_create(&zs->zs_cb_list.zcl_callbacks, sizeof (ztest_cb_data_t),
 	    offsetof(ztest_cb_data_t, zcd_node));
 
 	for (t = 0; t < ZTEST_SYNC_LOCKS; t++)
-		(void) pthread_mutex_init(&zs->zs_sync_lock[t], NULL);
+		mutex_init(&zs->zs_sync_lock[t], NULL, MUTEX_DEFAULT, NULL);
 
 	/*
 	 * Destroy one disk before we even start.
@@ -3967,7 +3967,8 @@ ztest_run(char *pool)
 	/*
 	 * Create a thread to periodically resume suspended I/O.
 	 */
-	VERIFY(pthread_create(&resume_tid, NULL, ztest_resume_thread, spa)==0);
+	resume_thread = thread_create(NULL, 0, ztest_resume_thread, spa,
+				      THR_BOUND, NULL, 0, 0);
 
 	/*
 	 * Verify that we can safely inquire about about any object,
@@ -4016,7 +4017,7 @@ ztest_run(char *pool)
 
 		if (t < zopt_datasets) {
 			int test_future = FALSE;
-			(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+			rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 			(void) snprintf(name, 100, "%s/%s_%d", pool, pool, d);
 			error = dmu_objset_create(name, DMU_OST_OTHER, NULL, 0,
 			    ztest_create_cb, NULL);
@@ -4024,7 +4025,7 @@ ztest_run(char *pool)
 				test_future = TRUE;
 			} else if (error == ENOSPC) {
 				zs->zs_enospc_count++;
-				(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+				rw_exit(&ztest_shared->zs_name_lock);
 				break;
 			} else if (error != 0) {
 				fatal(0, "dmu_objset_create(%s) = %d",
@@ -4035,7 +4036,7 @@ ztest_run(char *pool)
 			if (error)
 				fatal(0, "dmu_objset_open('%s') = %d",
 				    name, error);
-			(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+			rw_exit(&ztest_shared->zs_name_lock);
 			if (test_future)
 				ztest_dmu_check_future_leak(&za[t]);
 			zil_replay(za[d].za_os, za[d].za_os,
@@ -4043,12 +4044,12 @@ ztest_run(char *pool)
 			za[d].za_zilog = zil_open(za[d].za_os, NULL);
 		}
 
-		VERIFY(pthread_create(&za[t].za_thread, NULL, ztest_thread,
-		    &za[t]) == 0);
+		za[t].za_thread = thread_create(NULL, 0, ztest_thread, &za[t],
+						THR_BOUND, NULL, 0, 0);
 	}
 
 	while (--t >= 0) {
-		VERIFY(pthread_join(za[t].za_thread, NULL) == 0);
+		VERIFY(thr_join(za[t].za_thread, NULL, NULL) == 0);
 		if (t < zopt_datasets) {
 			zil_close(za[t].za_zilog);
 			dmu_objset_close(za[t].za_os);
@@ -4067,7 +4068,7 @@ ztest_run(char *pool)
 	 * If we had out-of-space errors, destroy a random objset.
 	 */
 	if (zs->zs_enospc_count != 0) {
-		(void) pthread_rwlock_rdlock(&ztest_shared->zs_name_lock);
+		rw_enter(&ztest_shared->zs_name_lock, RW_READER);
 		d = (int)ztest_random(zopt_datasets);
 		(void) snprintf(name, 100, "%s/%s_%d", pool, pool, d);
 		if (zopt_verbose >= 3)
@@ -4078,7 +4079,7 @@ ztest_run(char *pool)
 
 		(void) dmu_objset_find(name, ztest_destroy_cb, &za[d],
 		    DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
-		(void) pthread_rwlock_unlock(&ztest_shared->zs_name_lock);
+		rw_exit(&ztest_shared->zs_name_lock);
 	}
 
 	txg_wait_synced(spa_get_dsl(spa), 0);
@@ -4087,7 +4088,7 @@ ztest_run(char *pool)
 
 	/* Kill the resume thread */
 	ztest_exiting = B_TRUE;
-	VERIFY(pthread_join(resume_tid, NULL) == 0);
+	VERIFY(thr_join(resume_thread, NULL, NULL) == 0);
 	ztest_resume(spa);
 
 	/*
@@ -4103,9 +4104,9 @@ ztest_run(char *pool)
 
 	list_destroy(&zs->zs_cb_list.zcl_callbacks);
 
-	(void) pthread_mutex_destroy(&zs->zs_cb_list.zcl_callbacks_lock);
-	(void) pthread_rwlock_destroy(&zs->zs_name_lock);
-	(void) pthread_mutex_destroy(&zs->zs_vdev_lock);
+	mutex_destroy(&zs->zs_cb_list.zcl_callbacks_lock);
+	rw_destroy(&zs->zs_name_lock);
+	mutex_destroy(&zs->zs_vdev_lock);
 }
 
 void
diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index 1f50db6940..37a3e00502 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -153,18 +153,24 @@ extern void vpanic(const char *, __va_list);
 /*
  * Threads
  */
-#define	curthread		((void *)(uintptr_t)pthread_self())
 #define	tsd_get(key)		pthread_getspecific(key)
 #define	tsd_set(key, val)	pthread_setspecific(key, val)
 
-typedef struct kthread kthread_t;
 typedef void (*thread_func_t)(void *);
+typedef struct kthread {
+        list_node_t	t_node;
+	pthread_t	t_id;
+	pthread_attr_t	t_attr;
+} kthread_t;
 
-#define	thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
-	zk_thread_create((thread_func_t)func, arg)
-#define	thread_exit() pthread_exit(NULL)
+#define	curthread		zk_curthread()
+#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
+				zk_thread_create((thread_func_t)func, arg)
+#define thr_join(kt, v1, v2)	pthread_join(kt->t_id, v2)
 
+extern kthread_t *zk_curthread(void);
 extern kthread_t *zk_thread_create(thread_func_t func, void *arg);
+extern void thread_exit(void);
 
 #define	issig(why)	(FALSE)
 #define	ISSIG(thr, why)	(FALSE)
diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index 65faab8451..37209c8b4d 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -55,20 +55,66 @@ struct utsname utsname = {
  * threads
  * =========================================================================
  */
-/*ARGSUSED*/
+
+kmutex_t kthread_lock;
+list_t kthread_list;
+
+kthread_t *
+zk_curthread(void)
+{
+	kthread_t *kt;
+	pthread_t tid;
+
+	tid = pthread_self();
+	mutex_enter(&kthread_lock);
+        for (kt = list_head(&kthread_list); kt != NULL;
+	     kt = list_next(&kthread_list, kt)) {
+
+		if (kt->t_id == tid) {
+			mutex_exit(&kthread_lock);
+			return kt;
+		}
+	}
+	mutex_exit(&kthread_lock);
+
+	return NULL;
+}
+
 kthread_t *
 zk_thread_create(thread_func_t func, void *arg)
 {
-	pthread_t tid;
+	kthread_t *kt;
 
-	pthread_attr_t attr;
-	VERIFY(pthread_attr_init(&attr) == 0);
-	VERIFY(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
+	kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
 
-	VERIFY(pthread_create(&tid, &attr, (void *(*)(void *))func, arg) == 0);
+	VERIFY(pthread_attr_init(&kt->t_attr) == 0);
+	VERIFY(pthread_attr_setdetachstate(&kt->t_attr,
+					   PTHREAD_CREATE_DETACHED) == 0);
+	VERIFY(pthread_create(&kt->t_id, &kt->t_attr,
+			      (void *(*)(void *))func, arg) == 0);
 
-	/* XXX: not portable */
-	return ((void *)(uintptr_t)tid);
+	mutex_enter(&kthread_lock);
+	list_insert_head(&kthread_list, kt);
+	mutex_exit(&kthread_lock);
+
+	return kt;
+}
+
+void
+thread_exit(void)
+{
+	kthread_t *kt;
+
+	VERIFY((kt = curthread) != NULL);
+
+	mutex_enter(&kthread_lock);
+	list_remove(&kthread_list, kt);
+	mutex_exit(&kthread_lock);
+
+	VERIFY(pthread_attr_destroy(&kt->t_attr) == 0);
+	umem_free(kt, sizeof(kthread_t));
+
+	pthread_exit(NULL);
 }
 
 /*
@@ -861,6 +907,10 @@ kernel_init(int mode)
 	VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 	VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 
+	mutex_init(&kthread_lock, NULL, MUTEX_DEFAULT, NULL);
+	list_create(&kthread_list, sizeof (kthread_t),
+		    offsetof(kthread_t, t_node));
+
 	system_taskq_init();
 
 	spa_init(mode);
@@ -871,6 +921,9 @@ kernel_fini(void)
 {
 	spa_fini();
 
+	list_destroy(&kthread_list);
+	mutex_destroy(&kthread_lock);
+
 	close(random_fd);
 	close(urandom_fd);
 
diff --git a/lib/libzpool/taskq.c b/lib/libzpool/taskq.c
index 494e233eae..40dfb67893 100644
--- a/lib/libzpool/taskq.c
+++ b/lib/libzpool/taskq.c
@@ -42,7 +42,7 @@ struct taskq {
 	krwlock_t	tq_threadlock;
 	kcondvar_t	tq_dispatch_cv;
 	kcondvar_t	tq_wait_cv;
-	pthread_t	*tq_threadlist;
+	kthread_t	**tq_threadlist;
 	int		tq_flags;
 	int		tq_active;
 	int		tq_nthreads;
@@ -198,7 +198,7 @@ taskq_create(const char *name, int nthreads, pri_t pri,
 	tq->tq_maxalloc = maxalloc;
 	tq->tq_task.task_next = &tq->tq_task;
 	tq->tq_task.task_prev = &tq->tq_task;
-	tq->tq_threadlist = kmem_alloc(nthreads * sizeof (pthread_t), KM_SLEEP);
+	tq->tq_threadlist = kmem_alloc(nthreads*sizeof(kthread_t *), KM_SLEEP);
 
 	if (flags & TASKQ_PREPOPULATE) {
 		mutex_enter(&tq->tq_lock);
@@ -208,8 +208,8 @@ taskq_create(const char *name, int nthreads, pri_t pri,
 	}
 
 	for (t = 0; t < nthreads; t++)
-		VERIFY(pthread_create(&tq->tq_threadlist[t],
-		    NULL, taskq_thread, tq) == 0);
+		VERIFY((tq->tq_threadlist[t] = thread_create(NULL, 0,
+		       taskq_thread, tq, THR_BOUND, NULL, 0, 0)) != NULL);
 
 	return (tq);
 }
@@ -239,9 +239,9 @@ taskq_destroy(taskq_t *tq)
 	mutex_exit(&tq->tq_lock);
 
 	for (t = 0; t < nthreads; t++)
-		VERIFY(pthread_join(tq->tq_threadlist[t], NULL) == 0);
+		(void) thr_join(tq->tq_threadlist[t], NULL, NULL);
 
-	kmem_free(tq->tq_threadlist, nthreads * sizeof (pthread_t));
+	kmem_free(tq->tq_threadlist, nthreads * sizeof(kthread_t *));
 
 	rw_destroy(&tq->tq_threadlock);
 	mutex_destroy(&tq->tq_lock);
@@ -260,7 +260,7 @@ taskq_member(taskq_t *tq, void *t)
 		return (1);
 
 	for (i = 0; i < tq->tq_nthreads; i++)
-		if (tq->tq_threadlist[i] == (pthread_t)(uintptr_t)t)
+		if (tq->tq_threadlist[i] == (kthread_t *)t)
 			return (1);
 
 	return (0);