diff --git a/lib/chain/chain.js b/lib/chain/chain.js
index c5ea5d15..2c92dce8 100644
--- a/lib/chain/chain.js
+++ b/lib/chain/chain.js
@@ -73,7 +73,7 @@ function Chain(options) {
   this.total = 0;
   this.currentBlock = null;
   this.orphanLimit = options.orphanLimit || (20 << 20);
-  this.locker = new bcoin.locker(this, this.add);
+  this.locker = new bcoin.locker(true);
   this.invalid = {};
   this.bestHeight = -1;
   this.tip = null;
diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 63307d91..4c6a5214 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -40,7 +40,7 @@ function RPC(node) {
   this.walletdb = node.walletdb;
   this.logger = node.logger;
 
-  this.locker = new bcoin.locker(this);
+  this.locker = new bcoin.locker();
 
   this.feeRate = null;
   this.mining = false;
diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index b0939c4f..9ba87138 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -75,7 +75,7 @@ function Mempool(options) {
   this.logger = options.logger || this.chain.logger;
   this.loaded = false;
 
-  this.locker = new bcoin.locker(this, this.addTX);
+  this.locker = new bcoin.locker(true);
 
   this.size = 0;
   this.totalOrphans = 0;
diff --git a/lib/net/peer.js b/lib/net/peer.js
index 78b941ad..8739c378 100644
--- a/lib/net/peer.js
+++ b/lib/net/peer.js
@@ -82,7 +82,7 @@ function Peer(pool, addr, socket) {
   this.chain = this.pool.chain;
   this.mempool = this.pool.mempool;
   this.network = this.chain.network;
-  this.locker = new bcoin.locker(this);
+  this.locker = new bcoin.locker();
   this.version = null;
   this.destroyed = false;
   this.ack = false;
diff --git a/lib/net/pool.js b/lib/net/pool.js
index ae6c6cab..c566dfa4 100644
--- a/lib/net/pool.js
+++ b/lib/net/pool.js
@@ -103,7 +103,7 @@ function Pool(options) {
   this.connected = false;
   this.uid = 0;
   this.createServer = null;
-  this.locker = new bcoin.locker(this);
+  this.locker = new bcoin.locker();
   this.proxyServer = null;
   this.auth = null;
   this.identityKey = null;
diff --git a/lib/utils/locker.js b/lib/utils/locker.js
index 05b88605..c5de5011 100644
--- a/lib/utils/locker.js
+++ b/lib/utils/locker.js
@@ -15,23 +15,22 @@ var assert = utils.assert;
  * Represents a mutex lock for locking asynchronous object methods.
  * @exports Locker
  * @constructor
- * @param {Function} parent - Parent object.
  * @param {Function?} add - `add` method (whichever method is queuing data).
  */
 
-function Locker(parent, add) {
+function Locker(add) {
   if (!(this instanceof Locker))
-    return Locker.create(parent, add);
+    return Locker.create(add);
 
   EventEmitter.call(this);
 
-  this.parent = parent;
+  this.add = add === true;
+
   this.jobs = [];
   this.busy = false;
 
   this.pending = [];
   this.pendingMap = {};
-  this.add = add;
 
   this.unlocker = this.unlock.bind(this);
 }
@@ -40,15 +39,14 @@ utils.inherits(Locker, EventEmitter);
 
 /**
  * Create a closure scoped locker.
- * @param {Function} parent - Parent object.
  * @param {Function?} add
  * @returns {Function} Lock method.
  */
 
-Locker.create = function create(parent, add) {
-  var locker = new Locker(parent, add);
-  return function lock(func, args, force) {
-    return locker.lock(func, args, force);
+Locker.create = function create(add) {
+  var locker = new Locker(add);
+  return function lock(arg1, arg2) {
+    return locker.lock(arg1, arg2);
   };
 };
 
@@ -138,9 +136,10 @@ Locker.prototype.unlock = function unlock() {
  */
 
 Locker.prototype.destroy = function destroy() {
+  this.jobs.length = 0;
+  this.busy = false;
   this.pending.length = 0;
   this.pendingMap = {};
-  this.jobs.length = 0;
 };
 
 /**
@@ -166,28 +165,25 @@ Locker.prototype.onDrain = function onDrain() {
  * Locks methods according to passed-in key.
  * @exports MappedLock
  * @constructor
- * @param {Function} parent - Parent object.
  */
 
-function MappedLock(parent) {
+function MappedLock() {
   if (!(this instanceof MappedLock))
-    return MappedLock.create(parent);
+    return MappedLock.create();
 
-  this.parent = parent;
   this.jobs = {};
   this.busy = {};
 }
 
 /**
  * Create a closure scoped locker.
- * @param {Function} parent - Parent object.
  * @returns {Function} Lock method.
  */
 
-MappedLock.create = function create(parent) {
-  var locker = new MappedLock(parent);
-  return function lock(key, func, args, force) {
-    return locker.lock(key, func, args, force);
+MappedLock.create = function create() {
+  var locker = new MappedLock();
+  return function lock(key, force) {
+    return locker.lock(key, force);
   };
 };
 
@@ -255,10 +251,20 @@ MappedLock.prototype.unlock = function unlock(key) {
   };
 };
 
+/**
+ * Destroy the locker. Purge all pending calls.
+ */
+
+MappedLock.prototype.destroy = function destroy() {
+  this.jobs = {};
+  this.busy = {};
+};
+
 /*
  * Expose
  */
 
 exports = Locker;
 exports.mapped = MappedLock;
+
 module.exports = exports;
diff --git a/lib/wallet/txdb.js b/lib/wallet/txdb.js
index 35a0c171..8027f3cc 100644
--- a/lib/wallet/txdb.js
+++ b/lib/wallet/txdb.js
@@ -211,7 +211,7 @@ function TXDB(wallet) {
   this.options = wallet.db.options;
   this.locked = {};
 
-  this.locker = new bcoin.locker(this);
+  this.locker = new bcoin.locker();
   this.coinCache = new bcoin.lru(10000);
 
   this.current = null;
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index 68ab4c4b..dc1d9a3e 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -56,8 +56,8 @@ function Wallet(db, options) {
   this.db = db;
   this.network = db.network;
   this.logger = db.logger;
-  this.writeLock = new bcoin.locker(this);
-  this.fundLock = new bcoin.locker(this);
+  this.writeLock = new bcoin.locker();
+  this.fundLock = new bcoin.locker();
 
   this.wid = 0;
   this.id = null;
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index 0193eaa8..fd4bea00 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -135,9 +135,9 @@ function WalletDB(options) {
 
   // We need one read lock for `get` and `create`.
   // It will hold locks specific to wallet ids.
-  this.readLock = new bcoin.locker.mapped(this);
-  this.writeLock = new bcoin.locker(this);
-  this.txLock = new bcoin.locker(this);
+  this.readLock = new bcoin.locker.mapped();
+  this.writeLock = new bcoin.locker();
+  this.txLock = new bcoin.locker();
 
   this.walletCache = new bcoin.lru(10000);
   this.accountCache = new bcoin.lru(10000);