diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c
index ce84349586..230a007ba6 100644
--- a/cmd/zdb/zdb.c
+++ b/cmd/zdb/zdb.c
@@ -52,6 +52,7 @@
 #include <sys/zfs_fuid.h>
 #include <sys/arc.h>
 #undef ZFS_MAXNAMELEN
+#undef verify
 #include <libzfs.h>
 
 const char cmdname[] = "zdb";
diff --git a/cmd/zinject/translate.c b/cmd/zinject/translate.c
index 4127339ed1..d8654594d1 100644
--- a/cmd/zinject/translate.c
+++ b/cmd/zinject/translate.c
@@ -25,6 +25,8 @@
 
 #include <libzfs.h>
 
+#undef verify	/* both libzfs.h and zfs_context.h want to define this */
+
 #include <sys/zfs_context.h>
 
 #include <errno.h>
diff --git a/cmd/ztest/ztest.c b/cmd/ztest/ztest.c
index 3fff7f416f..4f8ca0d6bb 100644
--- a/cmd/ztest/ztest.c
+++ b/cmd/ztest/ztest.c
@@ -143,7 +143,7 @@ typedef struct ztest_args {
 	spa_t		*za_spa;
 	objset_t	*za_os;
 	zilog_t		*za_zilog;
-	kthread_t	*za_thread;
+	thread_t	za_thread;
 	uint64_t	za_instance;
 	uint64_t	za_random;
 	uint64_t	za_diroff;
@@ -235,29 +235,27 @@ ztest_info_t ztest_info[] = {
  * The callbacks are ordered by txg number.
  */
 typedef struct ztest_cb_list {
-	kmutex_t		zcl_callbacks_lock;
-	list_t			zcl_callbacks;
+	mutex_t	zcl_callbacks_lock;
+	list_t	zcl_callbacks;
 } ztest_cb_list_t;
 
 /*
  * Stuff we need to share writably between parent and child.
  */
 typedef struct ztest_shared {
-	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;
-	hrtime_t		zs_start_time;
-	hrtime_t		zs_stop_time;
-	uint64_t		zs_alloc;
-	uint64_t		zs_space;
-	ztest_info_t		zs_info[ZTEST_FUNCS];
-	kmutex_t		zs_sync_lock[ZTEST_SYNC_LOCKS];
-	uint64_t		zs_seq[ZTEST_SYNC_LOCKS];
-	ztest_cb_list_t		zs_cb_list;
-	kmutex_t		zs_thr_lock;
-	kcondvar_t		zs_thr_cv;
+	mutex_t		zs_vdev_lock;
+	rwlock_t	zs_name_lock;
+	uint64_t	zs_vdev_primaries;
+	uint64_t	zs_vdev_aux;
+	uint64_t	zs_enospc_count;
+	hrtime_t	zs_start_time;
+	hrtime_t	zs_stop_time;
+	uint64_t	zs_alloc;
+	uint64_t	zs_space;
+	ztest_info_t	zs_info[ZTEST_FUNCS];
+	mutex_t		zs_sync_lock[ZTEST_SYNC_LOCKS];
+	uint64_t	zs_seq[ZTEST_SYNC_LOCKS];
+	ztest_cb_list_t	zs_cb_list;
 } ztest_shared_t;
 
 static char ztest_dev_template[] = "%s/%s.%llua";
@@ -832,7 +830,7 @@ 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.
 	 */
-	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+	(void) rw_rdlock(&ztest_shared->zs_name_lock);
 	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);
@@ -848,7 +846,7 @@ ztest_spa_create_destroy(ztest_args_t *za)
 		fatal(0, "spa_destroy() = %d", error);
 
 	spa_close(spa, FTAG);
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 static vdev_t *
@@ -879,7 +877,7 @@ ztest_vdev_add_remove(ztest_args_t *za)
 	nvlist_t *nvroot;
 	int error;
 
-	mutex_enter(&ztest_shared->zs_vdev_lock);
+	(void) mutex_lock(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -897,7 +895,7 @@ ztest_vdev_add_remove(ztest_args_t *za)
 	error = spa_vdev_add(spa, nvroot);
 	nvlist_free(nvroot);
 
-	mutex_exit(&ztest_shared->zs_vdev_lock);
+	(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 
 	if (error == ENOSPC)
 		ztest_record_enospc("spa_vdev_add");
@@ -926,7 +924,7 @@ ztest_vdev_aux_add_remove(ztest_args_t *za)
 		aux = ZPOOL_CONFIG_L2CACHE;
 	}
 
-	mutex_enter(&ztest_shared->zs_vdev_lock);
+	(void) mutex_lock(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -982,7 +980,7 @@ ztest_vdev_aux_add_remove(ztest_args_t *za)
 			fatal(0, "spa_vdev_remove(%llu) = %d", guid, error);
 	}
 
-	mutex_exit(&ztest_shared->zs_vdev_lock);
+	(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 }
 
 /*
@@ -1008,7 +1006,7 @@ ztest_vdev_attach_detach(ztest_args_t *za)
 	int oldvd_is_log;
 	int error, expected_error;
 
-	mutex_enter(&ztest_shared->zs_vdev_lock);
+	(void) mutex_lock(&ztest_shared->zs_vdev_lock);
 
 	spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
 
@@ -1068,7 +1066,7 @@ 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);
-		mutex_exit(&ztest_shared->zs_vdev_lock);
+		(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 
@@ -1161,7 +1159,7 @@ ztest_vdev_attach_detach(ztest_args_t *za)
 		    (longlong_t)newsize, replacing, error, expected_error);
 	}
 
-	mutex_exit(&ztest_shared->zs_vdev_lock);
+	(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 }
 
 /*
@@ -1266,7 +1264,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 	size_t psize, newsize;
 	uint64_t spa_newsize, spa_cursize, ms_count;
 
-	mutex_enter(&ztest_shared->zs_vdev_lock);
+	(void) mutex_lock(&ztest_shared->zs_vdev_lock);
 	mutex_enter(&spa_namespace_lock);
 	spa_config_enter(spa, SCL_STATE, spa, RW_READER);
 
@@ -1294,7 +1292,7 @@ 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);
-		mutex_exit(&ztest_shared->zs_vdev_lock);
+		(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 	ASSERT(psize > 0);
@@ -1323,7 +1321,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 		}
 		(void) spa_config_exit(spa, SCL_STATE, spa);
 		mutex_exit(&spa_namespace_lock);
-		mutex_exit(&ztest_shared->zs_vdev_lock);
+		(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 		return;
 	}
 
@@ -1363,7 +1361,7 @@ ztest_vdev_LUN_growth(ztest_args_t *za)
 		    spa->spa_name, oldnumbuf, newnumbuf);
 	}
 	spa_config_exit(spa, SCL_STATE, spa);
-	mutex_exit(&ztest_shared->zs_vdev_lock);
+	(void) mutex_unlock(&ztest_shared->zs_vdev_lock);
 }
 
 /* ARGSUSED */
@@ -1462,7 +1460,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	uint64_t seq;
 	uint64_t objects;
 
-	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+	(void) rw_rdlock(&ztest_shared->zs_name_lock);
 	(void) snprintf(name, 100, "%s/%s_temp_%llu", za->za_pool, za->za_pool,
 	    (u_longlong_t)za->za_instance);
 
@@ -1505,7 +1503,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	if (error) {
 		if (error == ENOSPC) {
 			ztest_record_enospc("dmu_objset_create");
-			rw_exit(&ztest_shared->zs_name_lock);
+			(void) rw_unlock(&ztest_shared->zs_name_lock);
 			return;
 		}
 		fatal(0, "dmu_objset_create(%s) = %d", name, error);
@@ -1587,7 +1585,7 @@ ztest_dmu_objset_create_destroy(ztest_args_t *za)
 	if (error)
 		fatal(0, "dmu_objset_destroy(%s) = %d", name, error);
 
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -1601,7 +1599,7 @@ ztest_dmu_snapshot_create_destroy(ztest_args_t *za)
 	char snapname[100];
 	char osname[MAXNAMELEN];
 
-	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+	(void) rw_rdlock(&ztest_shared->zs_name_lock);
 	dmu_objset_name(os, osname);
 	(void) snprintf(snapname, 100, "%s@%llu", osname,
 	    (u_longlong_t)za->za_instance);
@@ -1615,7 +1613,7 @@ 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);
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -1677,7 +1675,7 @@ ztest_dsl_dataset_promote_busy(ztest_args_t *za)
 	char osname[MAXNAMELEN];
 	uint64_t curval = za->za_instance;
 
-	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+	(void) rw_rdlock(&ztest_shared->zs_name_lock);
 
 	dmu_objset_name(os, osname);
 	ztest_dsl_dataset_cleanup(osname, curval);
@@ -1767,7 +1765,7 @@ ztest_dsl_dataset_promote_busy(ztest_args_t *za)
 out:
 	ztest_dsl_dataset_cleanup(osname, curval);
 
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -2575,7 +2573,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	int bs = ZTEST_DIROBJ_BLOCKSIZE;
 	int do_free = 0;
 	uint64_t off, txg, txg_how;
-	kmutex_t *lp;
+	mutex_t *lp;
 	char osname[MAXNAMELEN];
 	char *iobuf;
 	blkptr_t blk;
@@ -2638,7 +2636,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	txg = dmu_tx_get_txg(tx);
 
 	lp = &ztest_shared->zs_sync_lock[b];
-	mutex_enter(lp);
+	(void) mutex_lock(lp);
 
 	wbt->bt_objset = dmu_objset_id(os);
 	wbt->bt_object = ZTEST_DIROBJ;
@@ -2695,7 +2693,7 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 		dmu_buf_rele(bonus_db, FTAG);
 	}
 
-	mutex_exit(lp);
+	(void) mutex_unlock(lp);
 
 	if (ztest_random(1000) == 0)
 		(void) poll(NULL, 0, 1); /* open dn_notxholds window */
@@ -2714,13 +2712,13 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	/*
 	 * dmu_sync() the block we just wrote.
 	 */
-	mutex_enter(lp);
+	(void) mutex_lock(lp);
 
 	blkoff = P2ALIGN_TYPED(off, bs, uint64_t);
 	error = dmu_buf_hold(os, ZTEST_DIROBJ, blkoff, FTAG, &db);
 	za->za_dbuf = db;
 	if (error) {
-		mutex_exit(lp);
+		(void) mutex_unlock(lp);
 		return;
 	}
 	blkoff = off - blkoff;
@@ -2729,18 +2727,18 @@ ztest_dmu_write_parallel(ztest_args_t *za)
 	za->za_dbuf = NULL;
 
 	if (error) {
-		mutex_exit(lp);
+		(void) mutex_unlock(lp);
 		return;
 	}
 
 	if (blk.blk_birth == 0)	{	/* concurrent free */
-		mutex_exit(lp);
+		(void) mutex_unlock(lp);
 		return;
 	}
 
 	txg_suspend(dmu_objset_pool(os));
 
-	mutex_exit(lp);
+	(void) mutex_unlock(lp);
 
 	ASSERT(blk.blk_fill == 1);
 	ASSERT3U(BP_GET_TYPE(&blk), ==, DMU_OT_UINT64_OTHER);
@@ -3155,9 +3153,9 @@ ztest_commit_callback(void *arg, int error)
 	ASSERT3U(data->zcd_txg, !=, 0);
 
 	/* Remove our callback from the list */
-	mutex_enter(&zcl->zcl_callbacks_lock);
+	(void) mutex_lock(&zcl->zcl_callbacks_lock);
 	list_remove(&zcl->zcl_callbacks, data);
-	mutex_exit(&zcl->zcl_callbacks_lock);
+	(void) mutex_unlock(&zcl->zcl_callbacks_lock);
 
 out:
 	umem_free(data, sizeof (ztest_cb_data_t));
@@ -3254,7 +3252,7 @@ ztest_dmu_commit_callbacks(ztest_args_t *za)
 
 	dmu_write(os, ZTEST_DIROBJ, za->za_diroff, sizeof (uint64_t), &txg, tx);
 
-	mutex_enter(&zcl->zcl_callbacks_lock);
+	(void) mutex_lock(&zcl->zcl_callbacks_lock);
 
 	/*
 	 * Since commit callbacks don't have any ordering requirement and since
@@ -3299,7 +3297,7 @@ ztest_dmu_commit_callbacks(ztest_args_t *za)
 		tmp_cb = cb_data[i];
 	}
 
-	mutex_exit(&zcl->zcl_callbacks_lock);
+	(void) mutex_unlock(&zcl->zcl_callbacks_lock);
 
 	dmu_tx_commit(tx);
 }
@@ -3315,7 +3313,7 @@ ztest_dsl_prop_get_set(ztest_args_t *za)
 	char osname[MAXNAMELEN];
 	int error;
 
-	rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+	(void) rw_rdlock(&ztest_shared->zs_name_lock);
 
 	dmu_objset_name(os, osname);
 
@@ -3354,7 +3352,7 @@ ztest_dsl_prop_get_set(ztest_args_t *za)
 		}
 	}
 
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 /*
@@ -3518,7 +3516,7 @@ ztest_spa_rename(ztest_args_t *za)
 	int error;
 	spa_t *spa;
 
-	rw_enter(&ztest_shared->zs_name_lock, RW_WRITER);
+	(void) rw_wrlock(&ztest_shared->zs_name_lock);
 
 	oldname = za->za_pool;
 	newname = umem_alloc(strlen(oldname) + 5, UMEM_NOFAIL);
@@ -3570,7 +3568,7 @@ ztest_spa_rename(ztest_args_t *za)
 
 	umem_free(newname, strlen(newname) + 1);
 
-	rw_exit(&ztest_shared->zs_name_lock);
+	(void) rw_unlock(&ztest_shared->zs_name_lock);
 }
 
 
@@ -3828,10 +3826,6 @@ ztest_resume_thread(void *arg)
 		(void) poll(NULL, 0, 1000);
 		ztest_resume(spa);
 	}
-
-	resume_thr_exited = B_TRUE;
-
-	thread_exit();
 	return (NULL);
 }
 
@@ -3896,14 +3890,6 @@ ztest_thread(void *arg)
 			break;
 	}
 
-	mutex_enter(&zs->zs_thr_lock);
-	za->za_exited = B_TRUE;
-	mutex_exit(&zs->zs_thr_lock);
-
-	/* Announce that the thread has finished */
-	cv_broadcast(&zs->zs_thr_cv);
-
-	thread_exit();
 	return (NULL);
 }
 
@@ -3918,21 +3904,20 @@ ztest_run(char *pool)
 	ztest_args_t *za;
 	spa_t *spa;
 	char name[100];
-	kthread_t *resume_thread;
+	thread_t resume_tid;
 
 	ztest_exiting = B_FALSE;
 
-	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);
-	mutex_init(&zs->zs_thr_lock, NULL, MUTEX_DEFAULT, NULL);
-	cv_init(&zs->zs_thr_cv, NULL, CV_DEFAULT, NULL);
+	(void) _mutex_init(&zs->zs_vdev_lock, USYNC_THREAD, NULL);
+	(void) rwlock_init(&zs->zs_name_lock, USYNC_THREAD, NULL);
+	(void) _mutex_init(&zs->zs_cb_list.zcl_callbacks_lock, USYNC_THREAD,
+	    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++)
-		mutex_init(&zs->zs_sync_lock[t], NULL, MUTEX_DEFAULT, NULL);
+		(void) _mutex_init(&zs->zs_sync_lock[t], USYNC_THREAD, NULL);
 
 	/*
 	 * Destroy one disk before we even start.
@@ -3999,9 +3984,8 @@ ztest_run(char *pool)
 	/*
 	 * Create a thread to periodically resume suspended I/O.
 	 */
-	resume_thr_exited = B_FALSE;
-	VERIFY3P((resume_thread = thread_create(NULL, 0, ztest_resume_thread,
-	    spa, TS_RUN, NULL, 0, 0)), !=, NULL);
+	VERIFY(thr_create(0, 0, ztest_resume_thread, spa, THR_BOUND,
+	    &resume_tid) == 0);
 
 	/*
 	 * Verify that we can safely inquire about about any object,
@@ -4050,7 +4034,7 @@ ztest_run(char *pool)
 
 		if (t < zopt_datasets) {
 			int test_future = FALSE;
-			rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+			(void) rw_rdlock(&ztest_shared->zs_name_lock);
 			(void) snprintf(name, 100, "%s/%s_%d", pool, pool, d);
 			error = dmu_objset_create(name, DMU_OST_OTHER, NULL, 0,
 			    ztest_create_cb, NULL);
@@ -4058,7 +4042,7 @@ ztest_run(char *pool)
 				test_future = TRUE;
 			} else if (error == ENOSPC) {
 				zs->zs_enospc_count++;
-				rw_exit(&ztest_shared->zs_name_lock);
+				(void) rw_unlock(&ztest_shared->zs_name_lock);
 				break;
 			} else if (error != 0) {
 				fatal(0, "dmu_objset_create(%s) = %d",
@@ -4069,7 +4053,7 @@ ztest_run(char *pool)
 			if (error)
 				fatal(0, "dmu_objset_open('%s') = %d",
 				    name, error);
-			rw_exit(&ztest_shared->zs_name_lock);
+			(void) rw_unlock(&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,
@@ -4077,18 +4061,12 @@ ztest_run(char *pool)
 			za[d].za_zilog = zil_open(za[d].za_os, NULL);
 		}
 
-		za[t].za_exited = B_FALSE;
-
-		VERIFY3P((za[t].za_thread = thread_create(NULL, 0, ztest_thread,
-		    &za[t], TS_RUN, NULL, 0, 0)), !=, NULL);
+		VERIFY(thr_create(0, 0, ztest_thread, &za[t], THR_BOUND,
+		    &za[t].za_thread) == 0);
 	}
 
 	while (--t >= 0) {
-		mutex_enter(&zs->zs_thr_lock);
-		while (!za[t].za_exited)
-			cv_wait(&zs->zs_thr_cv, &zs->zs_thr_lock);
-		mutex_exit(&zs->zs_thr_lock);
-
+		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);
@@ -4107,7 +4085,7 @@ ztest_run(char *pool)
 	 * If we had out-of-space errors, destroy a random objset.
 	 */
 	if (zs->zs_enospc_count != 0) {
-		rw_enter(&ztest_shared->zs_name_lock, RW_READER);
+		(void) rw_rdlock(&ztest_shared->zs_name_lock);
 		d = (int)ztest_random(zopt_datasets);
 		(void) snprintf(name, 100, "%s/%s_%d", pool, pool, d);
 		if (zopt_verbose >= 3)
@@ -4118,7 +4096,7 @@ ztest_run(char *pool)
 
 		(void) dmu_objset_find(name, ztest_destroy_cb, &za[d],
 		    DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
-		rw_exit(&ztest_shared->zs_name_lock);
+		(void) rw_unlock(&ztest_shared->zs_name_lock);
 	}
 
 	txg_wait_synced(spa_get_dsl(spa), 0);
@@ -4127,11 +4105,7 @@ ztest_run(char *pool)
 
 	/* Kill the resume thread */
 	ztest_exiting = B_TRUE;
-
-	/* Wait for the resume thread to exit */
-	while (!resume_thr_exited)
-		(void) poll(NULL, 0, 200);
-
+	VERIFY(thr_join(resume_tid, NULL, NULL) == 0);
 	ztest_resume(spa);
 
 	/*
@@ -4147,11 +4121,9 @@ ztest_run(char *pool)
 
 	list_destroy(&zs->zs_cb_list.zcl_callbacks);
 
-	cv_destroy(&zs->zs_thr_cv);
-	mutex_destroy(&zs->zs_thr_lock);
-	mutex_destroy(&zs->zs_cb_list.zcl_callbacks_lock);
-	rw_destroy(&zs->zs_name_lock);
-	mutex_destroy(&zs->zs_vdev_lock);
+	(void) _mutex_destroy(&zs->zs_cb_list.zcl_callbacks_lock);
+	(void) rwlock_destroy(&zs->zs_name_lock);
+	(void) _mutex_destroy(&zs->zs_vdev_lock);
 }
 
 void
diff --git a/lib/libuutil/uu_misc.c b/lib/libuutil/uu_misc.c
index 3bd5c31192..a4ae4a1e72 100644
--- a/lib/libuutil/uu_misc.c
+++ b/lib/libuutil/uu_misc.c
@@ -37,6 +37,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/debug.h>
+#include <thread.h>
 #include <unistd.h>
 
 #if !defined(TEXT_DOMAIN)
@@ -69,12 +70,11 @@ static va_list		uu_panic_args;
 static pthread_t	uu_panic_thread;
 
 static uint32_t		_uu_main_error;
-static __thread int	_uu_main_thread = 0;
 
 void
 uu_set_error(uint_t code)
 {
-	if (_uu_main_thread) {
+	if (thr_main() != 0) {
 		_uu_main_error = code;
 		return;
 	}
@@ -103,7 +103,7 @@ uu_set_error(uint_t code)
 uint32_t
 uu_error(void)
 {
-	if (_uu_main_thread)
+	if (thr_main() != 0)
 		return (_uu_main_error);
 
 	if (uu_error_key_setup < 0)	/* can't happen? */
@@ -261,6 +261,5 @@ uu_init(void) __attribute__((constructor));
 static void
 uu_init(void)
 {
-	_uu_main_thread = 1;
 	(void) pthread_atfork(uu_lockup, uu_release, uu_release_child);
 }
diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index 7cbac416e2..51d0a3fa1d 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -50,7 +50,8 @@ extern "C" {
 #include <errno.h>
 #include <string.h>
 #include <strings.h>
-#include <pthread.h>
+#include <synch.h>
+#include <thread.h>
 #include <assert.h>
 #include <alloca.h>
 #include <umem.h>
@@ -111,7 +112,6 @@ extern void vpanic(const char *, __va_list);
 #define	fm_panic	panic
 
 /* This definition is copied from assert.h. */
-#ifndef verify
 #if defined(__STDC__)
 #if __STDC_VERSION__ - 0 >= 199901L
 #define	verify(EX) (void)((EX) || \
@@ -122,10 +122,7 @@ extern void vpanic(const char *, __va_list);
 #else
 #define	verify(EX) (void)((EX) || (_assert("EX", __FILE__, __LINE__), 0))
 #endif	/* __STDC__ */
-#endif
 
-#undef VERIFY
-#undef ASSERT
 
 #define	VERIFY	verify
 #define	ASSERT	assert
@@ -198,34 +195,15 @@ _NOTE(CONSTCOND) } while (0)
 /*
  * Threads
  */
-#define TS_RUN			0x00000002
+#define	curthread	((void *)(uintptr_t)thr_self())
 
-#define STACK_SIZE 8192 /* Linux x86 and amd64 */
+typedef struct kthread kthread_t;
 
-typedef void (*thread_func_t)(void);
-typedef void (*thread_func_arg_t)(void *);
-typedef pthread_t kt_did_t;
+#define	thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
+	zk_thread_create(func, arg)
+#define	thread_exit() thr_exit(NULL)
 
-typedef struct kthread {
-	kt_did_t	t_tid;
-	thread_func_t	t_func;
-	void *		t_arg;
-} kthread_t;
-
-/* XXX tsd_create()/tsd_destroy() missing */
-#define	tsd_get(key)		pthread_getspecific(key)
-#define	tsd_set(key, val)	pthread_setspecific(key, val)
-#define	curthread		zk_thread_current()
-#define thread_exit		zk_thread_exit
-#define thread_create(stk, stksize, func, arg, len, pp, state, pri)	\
-	zk_thread_create(stk, stksize, (thread_func_t) func, arg, len,  \
-	    NULL, state, pri)
-
-extern kthread_t *zk_thread_current(void);
-extern void zk_thread_exit(void);
-extern kthread_t *zk_thread_create(caddr_t stk, size_t  stksize,
-	thread_func_t func, void *arg, size_t len,
-	void *pp, int state, pri_t pri);
+extern kthread_t *zk_thread_create(void (*func)(), void *arg);
 
 #define	issig(why)	(FALSE)
 #define	ISSIG(thr, why)	(FALSE)
@@ -233,20 +211,28 @@ extern kthread_t *zk_thread_create(caddr_t stk, size_t  stksize,
 /*
  * Mutexes
  */
-#define MTX_MAGIC 0x9522f51362a6e326ull
-#define MTX_INIT  (void *)NULL
-#define MTX_DEST  (void *)-1UL
 typedef struct kmutex {
 	void		*m_owner;
-	uint64_t	m_magic;
-	pthread_mutex_t	m_lock;
+	boolean_t	initialized;
+	mutex_t		m_lock;
 } kmutex_t;
 
-#define	MUTEX_DEFAULT	0
-#define	MUTEX_HELD(m)	((m)->m_owner == curthread)
+#define	MUTEX_DEFAULT	USYNC_THREAD
+#undef MUTEX_HELD
+#define	MUTEX_HELD(m) _mutex_held(&(m)->m_lock)
 
-extern void mutex_init(kmutex_t *mp, char *name, int type, void *cookie);
-extern void mutex_destroy(kmutex_t *mp);
+/*
+ * Argh -- we have to get cheesy here because the kernel and userland
+ * have different signatures for the same routine.
+ */
+extern int _mutex_init(mutex_t *mp, int type, void *arg);
+extern int _mutex_destroy(mutex_t *mp);
+
+#define	mutex_init(mp, b, c, d)		zmutex_init((kmutex_t *)(mp))
+#define	mutex_destroy(mp)		zmutex_destroy((kmutex_t *)(mp))
+
+extern void zmutex_init(kmutex_t *mp);
+extern void zmutex_destroy(kmutex_t *mp);
 extern void mutex_enter(kmutex_t *mp);
 extern void mutex_exit(kmutex_t *mp);
 extern int mutex_tryenter(kmutex_t *mp);
@@ -255,26 +241,23 @@ extern void *mutex_owner(kmutex_t *mp);
 /*
  * RW locks
  */
-#define RW_MAGIC 0x4d31fb123648e78aull
-#define RW_INIT  (void *)NULL
-#define RW_DEST  (void *)-1UL
 typedef struct krwlock {
-	void			*rw_owner;
-	void			*rw_wr_owner;
-	uint64_t		rw_magic;
-	pthread_rwlock_t	rw_lock;
-	uint_t			rw_readers;
+	void		*rw_owner;
+	boolean_t	initialized;
+	rwlock_t	rw_lock;
 } krwlock_t;
 
 typedef int krw_t;
 
 #define	RW_READER	0
 #define	RW_WRITER	1
-#define	RW_DEFAULT	0
+#define	RW_DEFAULT	USYNC_THREAD
 
-#define	RW_READ_HELD(x)		((x)->rw_readers > 0)
-#define	RW_WRITE_HELD(x)	((x)->rw_wr_owner == curthread)
-#define	RW_LOCK_HELD(x)		(RW_READ_HELD(x) || RW_WRITE_HELD(x))
+#undef RW_READ_HELD
+#define	RW_READ_HELD(x)		_rw_read_held(&(x)->rw_lock)
+
+#undef RW_WRITE_HELD
+#define	RW_WRITE_HELD(x)	_rw_write_held(&(x)->rw_lock)
 
 extern void rw_init(krwlock_t *rwlp, char *name, int type, void *arg);
 extern void rw_destroy(krwlock_t *rwlp);
@@ -292,13 +275,9 @@ extern gid_t *crgetgroups(cred_t *cr);
 /*
  * Condition variables
  */
-#define CV_MAGIC 0xd31ea9a83b1b30c4ull
-typedef struct kcondvar {
-	uint64_t cv_magic;
-	pthread_cond_t cv;
-} kcondvar_t;
+typedef cond_t kcondvar_t;
 
-#define	CV_DEFAULT	0
+#define	CV_DEFAULT	USYNC_THREAD
 
 extern void cv_init(kcondvar_t *cv, char *name, int type, void *arg);
 extern void cv_destroy(kcondvar_t *cv);
@@ -359,7 +338,6 @@ extern void	taskq_destroy(taskq_t *);
 extern void	taskq_wait(taskq_t *);
 extern int	taskq_member(taskq_t *, kthread_t *);
 extern void	system_taskq_init(void);
-extern void	system_taskq_fini(void);
 
 #define	XVA_MAPSIZE	3
 #define	XVA_MAGIC	0x78766174
@@ -474,8 +452,7 @@ extern void delay(clock_t ticks);
 #define	minclsyspri	60
 #define	maxclsyspri	99
 
-/* XXX: not portable */
-#define	CPU_SEQID	(pthread_self() & (max_ncpus - 1))
+#define	CPU_SEQID	(thr_self() & (max_ncpus - 1))
 
 #define	kcred		NULL
 #define	CRED()		NULL
diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index 21e0393651..7f6c37da08 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -30,13 +30,11 @@
 #include <stdlib.h>
 #include <string.h>
 #include <zlib.h>
-#include <sys/signal.h>
 #include <sys/spa.h>
 #include <sys/stat.h>
 #include <sys/processor.h>
 #include <sys/zfs_context.h>
 #include <sys/utsname.h>
-#include <sys/time.h>
 #include <sys/systeminfo.h>
 
 /*
@@ -56,144 +54,16 @@ struct utsname utsname = {
  * threads
  * =========================================================================
  */
-
-pthread_cond_t kthread_cond = PTHREAD_COND_INITIALIZER;
-pthread_mutex_t kthread_lock = PTHREAD_MUTEX_INITIALIZER;
-pthread_key_t kthread_key;
-int kthread_nr = 0;
-
-static void
-thread_init(void)
-{
-	kthread_t *kt;
-
-	VERIFY3S(pthread_key_create(&kthread_key, NULL), ==, 0);
-
-	/* Create entry for primary kthread */
-	kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
-	kt->t_tid = pthread_self();
-	kt->t_func = NULL;
-
-	VERIFY3S(pthread_setspecific(kthread_key, kt), ==, 0);
-
-	/* Only the main thread should be running at the moment */
-	ASSERT3S(kthread_nr, ==, 0);
-	kthread_nr = 1;
-}
-
-static void
-thread_fini(void)
-{
-	kthread_t *kt = curthread;
-
-	ASSERT(pthread_equal(kt->t_tid, pthread_self()));
-	ASSERT3P(kt->t_func, ==, NULL);
-
-	umem_free(kt, sizeof(kthread_t));
-
-	/* Wait for all threads to exit via thread_exit() */
-	VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
-
-	kthread_nr--; /* Main thread is exiting */
-
-	while (kthread_nr > 0)
-		VERIFY3S(pthread_cond_wait(&kthread_cond, &kthread_lock), ==,
-		    0);
-
-	ASSERT3S(kthread_nr, ==, 0);
-	VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
-
-	VERIFY3S(pthread_key_delete(kthread_key), ==, 0);
-}
-
+/*ARGSUSED*/
 kthread_t *
-zk_thread_current(void)
+zk_thread_create(void (*func)(), void *arg)
 {
-	kthread_t *kt = pthread_getspecific(kthread_key);
+	thread_t tid;
 
-	ASSERT3P(kt, !=, NULL);
+	VERIFY(thr_create(0, 0, (void *(*)(void *))func, arg, THR_DETACHED,
+	    &tid) == 0);
 
-	return kt;
-}
-
-void *
-zk_thread_helper(void *arg)
-{
-	kthread_t *kt = (kthread_t *) arg;
-
-	VERIFY3S(pthread_setspecific(kthread_key, kt), ==, 0);
-
-	VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
-	kthread_nr++;
-	VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
-
-	kt->t_tid = pthread_self();
-	((thread_func_arg_t) kt->t_func)(kt->t_arg);
-
-	/* Unreachable, thread must exit with thread_exit() */
-	abort();
-
-	return NULL;
-}
-
-kthread_t *
-zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
-	      size_t len, void *pp, int state, pri_t pri)
-{
-	kthread_t *kt;
-	pthread_t tid;
-	pthread_attr_t attr;
-	size_t stack;
-
-	/*
-	 * Due to a race when getting/setting the thread ID, currently only
-	 * detached threads are supported.
-	 */
-	ASSERT3S(state & ~TS_RUN, ==, 0);
-
-	kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
-	kt->t_func = func;
-	kt->t_arg = arg;
-
-	/*
-	 * The Solaris kernel stack size in x86/x64 is 8K, so we reduce the
-	 * default stack size in userspace, for sanity checking.
-	 *
-	 * PTHREAD_STACK_MIN is the stack required for a NULL procedure in
-	 * userspace.
-	 *
-	 * XXX: Stack size for other architectures is not being taken into
-	 * account.
-	 */
-	stack = PTHREAD_STACK_MIN + MAX(stksize, STACK_SIZE);
-
-	VERIFY3S(pthread_attr_init(&attr), ==, 0);
-	VERIFY3S(pthread_attr_setstacksize(&attr, stack), ==, 0);
-	VERIFY3S(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED),
-	    ==, 0);
-
-	VERIFY3S(pthread_create(&tid, &attr, &zk_thread_helper, kt), ==, 0);
-
-	VERIFY3S(pthread_attr_destroy(&attr), ==, 0);
-
-	return kt;
-}
-
-void
-zk_thread_exit(void)
-{
-	kthread_t *kt = curthread;
-
-	ASSERT(pthread_equal(kt->t_tid, pthread_self()));
-
-	umem_free(kt, sizeof(kthread_t));
-
-	pthread_mutex_lock(&kthread_lock);
-	kthread_nr--;
-	pthread_mutex_unlock(&kthread_lock);
-
-	pthread_cond_broadcast(&kthread_cond);
-	pthread_exit(NULL);
+	return ((void *)(uintptr_t)tid);
 }
 
 /*
@@ -225,48 +95,41 @@ kstat_delete(kstat_t *ksp)
  * =========================================================================
  */
 void
-mutex_init(kmutex_t *mp, char *name, int type, void *cookie)
+zmutex_init(kmutex_t *mp)
 {
-	ASSERT3S(type, ==, MUTEX_DEFAULT);
-	ASSERT3P(cookie, ==, NULL);
-
-#ifdef IM_FEELING_LUCKY
-	ASSERT3U(mp->m_magic, !=, MTX_MAGIC);
-#endif
-
-	mp->m_owner = MTX_INIT;
-	mp->m_magic = MTX_MAGIC;
-	VERIFY3S(pthread_mutex_init(&mp->m_lock, NULL), ==, 0);
+	mp->m_owner = NULL;
+	mp->initialized = B_TRUE;
+	(void) _mutex_init(&mp->m_lock, USYNC_THREAD, NULL);
 }
 
 void
-mutex_destroy(kmutex_t *mp)
+zmutex_destroy(kmutex_t *mp)
 {
-	ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
-	ASSERT3P(mp->m_owner, ==, MTX_INIT);
-	VERIFY3S(pthread_mutex_destroy(&(mp)->m_lock), ==, 0);
-	mp->m_owner = MTX_DEST;
-	mp->m_magic = 0;
+	ASSERT(mp->initialized == B_TRUE);
+	ASSERT(mp->m_owner == NULL);
+	(void) _mutex_destroy(&(mp)->m_lock);
+	mp->m_owner = (void *)-1UL;
+	mp->initialized = B_FALSE;
 }
 
 void
 mutex_enter(kmutex_t *mp)
 {
-	ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
-	ASSERT3P(mp->m_owner, !=, MTX_DEST);
-	ASSERT3P(mp->m_owner, !=, curthread);
-	VERIFY3S(pthread_mutex_lock(&mp->m_lock), ==, 0);
-	ASSERT3P(mp->m_owner, ==, MTX_INIT);
+	ASSERT(mp->initialized == B_TRUE);
+	ASSERT(mp->m_owner != (void *)-1UL);
+	ASSERT(mp->m_owner != curthread);
+	VERIFY(mutex_lock(&mp->m_lock) == 0);
+	ASSERT(mp->m_owner == NULL);
 	mp->m_owner = curthread;
 }
 
 int
 mutex_tryenter(kmutex_t *mp)
 {
-	ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
-	ASSERT3P(mp->m_owner, !=, MTX_DEST);
-	if (0 == pthread_mutex_trylock(&mp->m_lock)) {
-		ASSERT3P(mp->m_owner, ==, MTX_INIT);
+	ASSERT(mp->initialized == B_TRUE);
+	ASSERT(mp->m_owner != (void *)-1UL);
+	if (0 == mutex_trylock(&mp->m_lock)) {
+		ASSERT(mp->m_owner == NULL);
 		mp->m_owner = curthread;
 		return (1);
 	} else {
@@ -277,16 +140,16 @@ mutex_tryenter(kmutex_t *mp)
 void
 mutex_exit(kmutex_t *mp)
 {
-	ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
-	ASSERT3P(mutex_owner(mp), ==, curthread);
-	mp->m_owner = MTX_INIT;
-	VERIFY3S(pthread_mutex_unlock(&mp->m_lock), ==, 0);
+	ASSERT(mp->initialized == B_TRUE);
+	ASSERT(mutex_owner(mp) == curthread);
+	mp->m_owner = NULL;
+	VERIFY(mutex_unlock(&mp->m_lock) == 0);
 }
 
 void *
 mutex_owner(kmutex_t *mp)
 {
-	ASSERT3U(mp->m_magic, ==, MTX_MAGIC);
+	ASSERT(mp->initialized == B_TRUE);
 	return (mp->m_owner);
 }
 
@@ -299,48 +162,31 @@ mutex_owner(kmutex_t *mp)
 void
 rw_init(krwlock_t *rwlp, char *name, int type, void *arg)
 {
-	ASSERT3S(type, ==, RW_DEFAULT);
-	ASSERT3P(arg, ==, NULL);
-
-#ifdef IM_FEELING_LUCKY
-	ASSERT3U(rwlp->rw_magic, !=, RW_MAGIC);
-#endif
-
-	VERIFY3S(pthread_rwlock_init(&rwlp->rw_lock, NULL), ==, 0);
-	rwlp->rw_owner = RW_INIT;
-	rwlp->rw_wr_owner = RW_INIT;
-	rwlp->rw_readers = 0;
-	rwlp->rw_magic = RW_MAGIC;
+	rwlock_init(&rwlp->rw_lock, USYNC_THREAD, NULL);
+	rwlp->rw_owner = NULL;
+	rwlp->initialized = B_TRUE;
 }
 
 void
 rw_destroy(krwlock_t *rwlp)
 {
-	ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
-
-	VERIFY3S(pthread_rwlock_destroy(&rwlp->rw_lock), ==, 0);
-	rwlp->rw_magic = 0;
+	rwlock_destroy(&rwlp->rw_lock);
+	rwlp->rw_owner = (void *)-1UL;
+	rwlp->initialized = B_FALSE;
 }
 
 void
 rw_enter(krwlock_t *rwlp, krw_t rw)
 {
-	ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
-	ASSERT3P(rwlp->rw_owner, !=, curthread);
-	ASSERT3P(rwlp->rw_wr_owner, !=, curthread);
+	ASSERT(!RW_LOCK_HELD(rwlp));
+	ASSERT(rwlp->initialized == B_TRUE);
+	ASSERT(rwlp->rw_owner != (void *)-1UL);
+	ASSERT(rwlp->rw_owner != curthread);
 
-	if (rw == RW_READER) {
-		VERIFY3S(pthread_rwlock_rdlock(&rwlp->rw_lock), ==, 0);
-		ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
-
-		atomic_inc_uint(&rwlp->rw_readers);
-	} else {
-		VERIFY3S(pthread_rwlock_wrlock(&rwlp->rw_lock), ==, 0);
-		ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
-		ASSERT3U(rwlp->rw_readers, ==, 0);
-
-		rwlp->rw_wr_owner = curthread;
-	}
+	if (rw == RW_READER)
+		VERIFY(rw_rdlock(&rwlp->rw_lock) == 0);
+	else
+		VERIFY(rw_wrlock(&rwlp->rw_lock) == 0);
 
 	rwlp->rw_owner = curthread;
 }
@@ -348,16 +194,11 @@ rw_enter(krwlock_t *rwlp, krw_t rw)
 void
 rw_exit(krwlock_t *rwlp)
 {
-	ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
-	ASSERT(RW_LOCK_HELD(rwlp));
+	ASSERT(rwlp->initialized == B_TRUE);
+	ASSERT(rwlp->rw_owner != (void *)-1UL);
 
-	if (RW_READ_HELD(rwlp))
-		atomic_dec_uint(&rwlp->rw_readers);
-	else
-		rwlp->rw_wr_owner = RW_INIT;
-
-	rwlp->rw_owner = RW_INIT;
-	VERIFY3S(pthread_rwlock_unlock(&rwlp->rw_lock), ==, 0);
+	rwlp->rw_owner = NULL;
+	VERIFY(rw_unlock(&rwlp->rw_lock) == 0);
 }
 
 int
@@ -365,29 +206,19 @@ rw_tryenter(krwlock_t *rwlp, krw_t rw)
 {
 	int rv;
 
-	ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
+	ASSERT(rwlp->initialized == B_TRUE);
+	ASSERT(rwlp->rw_owner != (void *)-1UL);
 
 	if (rw == RW_READER)
-		rv = pthread_rwlock_tryrdlock(&rwlp->rw_lock);
+		rv = rw_tryrdlock(&rwlp->rw_lock);
 	else
-		rv = pthread_rwlock_trywrlock(&rwlp->rw_lock);
+		rv = rw_trywrlock(&rwlp->rw_lock);
 
 	if (rv == 0) {
-		ASSERT3P(rwlp->rw_wr_owner, ==, RW_INIT);
-
-		if (rw == RW_READER)
-			atomic_inc_uint(&rwlp->rw_readers);
-		else {
-			ASSERT3U(rwlp->rw_readers, ==, 0);
-			rwlp->rw_wr_owner = curthread;
-		}
-
 		rwlp->rw_owner = curthread;
 		return (1);
 	}
 
-	VERIFY3S(rv, ==, EBUSY);
-
 	return (0);
 }
 
@@ -395,7 +226,8 @@ rw_tryenter(krwlock_t *rwlp, krw_t rw)
 int
 rw_tryupgrade(krwlock_t *rwlp)
 {
-	ASSERT3U(rwlp->rw_magic, ==, RW_MAGIC);
+	ASSERT(rwlp->initialized == B_TRUE);
+	ASSERT(rwlp->rw_owner != (void *)-1UL);
 
 	return (0);
 }
@@ -409,34 +241,22 @@ rw_tryupgrade(krwlock_t *rwlp)
 void
 cv_init(kcondvar_t *cv, char *name, int type, void *arg)
 {
-	ASSERT3S(type, ==, CV_DEFAULT);
-
-#ifdef IM_FEELING_LUCKY
-	ASSERT3U(cv->cv_magic, !=, CV_MAGIC);
-#endif
-
-	cv->cv_magic = CV_MAGIC;
-
-	VERIFY3S(pthread_cond_init(&cv->cv, NULL), ==, 0);
+	VERIFY(cond_init(cv, type, NULL) == 0);
 }
 
 void
 cv_destroy(kcondvar_t *cv)
 {
-	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-	VERIFY3S(pthread_cond_destroy(&cv->cv), ==, 0);
-	cv->cv_magic = 0;
+	VERIFY(cond_destroy(cv) == 0);
 }
 
 void
 cv_wait(kcondvar_t *cv, kmutex_t *mp)
 {
-	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-	ASSERT3P(mutex_owner(mp), ==, curthread);
-	mp->m_owner = MTX_INIT;
-	int ret = pthread_cond_wait(&cv->cv, &mp->m_lock);
-	if (ret != 0)
-		VERIFY3S(ret, ==, EINTR);
+	ASSERT(mutex_owner(mp) == curthread);
+	mp->m_owner = NULL;
+	int ret = cond_wait(cv, &mp->m_lock);
+	VERIFY(ret == 0 || ret == EINTR);
 	mp->m_owner = curthread;
 }
 
@@ -444,38 +264,29 @@ clock_t
 cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
 {
 	int error;
-	struct timeval tv;
 	timestruc_t ts;
 	clock_t delta;
 
-	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-
 top:
 	delta = abstime - lbolt;
 	if (delta <= 0)
 		return (-1);
 
-	VERIFY(gettimeofday(&tv, NULL) == 0);
+	ts.tv_sec = delta / hz;
+	ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
 
-	ts.tv_sec = tv.tv_sec + delta / hz;
-	ts.tv_nsec = tv.tv_usec * 1000 + (delta % hz) * (NANOSEC / hz);
-	if (ts.tv_nsec >= NANOSEC) {
-		ts.tv_sec++;
-		ts.tv_nsec -= NANOSEC;
-	}
-
-	ASSERT3P(mutex_owner(mp), ==, curthread);
-	mp->m_owner = MTX_INIT;
-	error = pthread_cond_timedwait(&cv->cv, &mp->m_lock, &ts);
+	ASSERT(mutex_owner(mp) == curthread);
+	mp->m_owner = NULL;
+	error = cond_reltimedwait(cv, &mp->m_lock, &ts);
 	mp->m_owner = curthread;
 
-	if (error == ETIMEDOUT)
+	if (error == ETIME)
 		return (-1);
 
 	if (error == EINTR)
 		goto top;
 
-	VERIFY3S(error, ==, 0);
+	ASSERT(error == 0);
 
 	return (1);
 }
@@ -483,15 +294,13 @@ top:
 void
 cv_signal(kcondvar_t *cv)
 {
-	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-	VERIFY3S(pthread_cond_signal(&cv->cv), ==, 0);
+	VERIFY(cond_signal(cv) == 0);
 }
 
 void
 cv_broadcast(kcondvar_t *cv)
 {
-	ASSERT3U(cv->cv_magic, ==, CV_MAGIC);
-	VERIFY3S(pthread_cond_broadcast(&cv->cv), ==, 0);
+	VERIFY(cond_broadcast(cv) == 0);
 }
 
 /*
@@ -741,7 +550,7 @@ __dprintf(const char *file, const char *func, int line, const char *fmt, ...)
 		if (dprintf_find_string("pid"))
 			(void) printf("%d ", getpid());
 		if (dprintf_find_string("tid"))
-			(void) printf("%u ", (uint_t) pthread_self());
+			(void) printf("%u ", thr_self());
 		if (dprintf_find_string("cpu"))
 			(void) printf("%u ", getcpuid());
 		if (dprintf_find_string("time"))
@@ -982,8 +791,8 @@ kernel_init(int mode)
 	VERIFY((random_fd = open("/dev/random", O_RDONLY)) != -1);
 	VERIFY((urandom_fd = open("/dev/urandom", O_RDONLY)) != -1);
 
-	thread_init();
 	system_taskq_init();
+
 	spa_init(mode);
 }
 
@@ -991,8 +800,6 @@ void
 kernel_fini(void)
 {
 	spa_fini();
-	system_taskq_fini();
-	thread_fini();
 
 	close(random_fd);
 	close(urandom_fd);
diff --git a/lib/libzpool/taskq.c b/lib/libzpool/taskq.c
index 1efdf1d6fa..70b720ed8e 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;
-	kthread_t	**tq_threadlist;
+	thread_t	*tq_threadlist;
 	int		tq_flags;
 	int		tq_active;
 	int		tq_nthreads;
@@ -163,7 +163,7 @@ taskq_thread(void *arg)
 	tq->tq_nthreads--;
 	cv_broadcast(&tq->tq_wait_cv);
 	mutex_exit(&tq->tq_lock);
-	thread_exit();
+	return (NULL);
 }
 
 /*ARGSUSED*/
@@ -198,8 +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(tq->tq_nthreads * sizeof(kthread_t *),
-	    KM_SLEEP);
+	tq->tq_threadlist = kmem_alloc(nthreads * sizeof (thread_t), KM_SLEEP);
 
 	if (flags & TASKQ_PREPOPULATE) {
 		mutex_enter(&tq->tq_lock);
@@ -208,10 +207,9 @@ taskq_create(const char *name, int nthreads, pri_t pri,
 		mutex_exit(&tq->tq_lock);
 	}
 
-	for (t = 0; t < tq->tq_nthreads; t++) {
-		VERIFY((tq->tq_threadlist[t] = thread_create(NULL, 0,
-		    taskq_thread, tq, TS_RUN, NULL, 0, 0)) != NULL);
-	}
+	for (t = 0; t < nthreads; t++)
+		(void) thr_create(0, 0, taskq_thread,
+		    tq, THR_BOUND, &tq->tq_threadlist[t]);
 
 	return (tq);
 }
@@ -239,7 +237,10 @@ taskq_destroy(taskq_t *tq)
 
 	mutex_exit(&tq->tq_lock);
 
-	kmem_free(tq->tq_threadlist, nthreads * sizeof(kthread_t *));
+	for (t = 0; t < nthreads; t++)
+		(void) thr_join(tq->tq_threadlist[t], NULL, NULL);
+
+	kmem_free(tq->tq_threadlist, nthreads * sizeof (thread_t));
 
 	rw_destroy(&tq->tq_threadlock);
 	mutex_destroy(&tq->tq_lock);
@@ -258,7 +259,7 @@ taskq_member(taskq_t *tq, kthread_t *t)
 		return (1);
 
 	for (i = 0; i < tq->tq_nthreads; i++)
-		if (tq->tq_threadlist[i] == t)
+		if (tq->tq_threadlist[i] == (thread_t)(uintptr_t)t)
 			return (1);
 
 	return (0);
@@ -270,9 +271,3 @@ system_taskq_init(void)
 	system_taskq = taskq_create("system_taskq", 64, minclsyspri, 4, 512,
 	    TASKQ_DYNAMIC | TASKQ_PREPOPULATE);
 }
-
-void
-system_taskq_fini(void)
-{
-	taskq_destroy(system_taskq);
-}