1 files changed, 7 insertions, 9 deletions
diff --git a/core/examples/http_bench.js b/core/examples/http_bench.js
index 8eb764b55..7e678aecd 100644
--- a/core/examples/http_bench.js
+++ b/core/examples/http_bench.js
@@ -13,7 +13,6 @@ const responseBuf = new Uint8Array(
     .map(c => c.charCodeAt(0))
 );
 const promiseMap = new Map();
-let nextPromiseId = 1;
 
 function assert(cond) {
   if (!cond) {
@@ -37,8 +36,8 @@ const scratchBytes = new Uint8Array(
 );
 assert(scratchBytes.byteLength === 4 * 4);
 
-function send(promiseId, opId, arg, zeroCopy = null) {
-  scratch32[0] = promiseId;
+function send(isSync, opId, arg, zeroCopy = null) {
+  scratch32[0] = isSync;
   scratch32[1] = opId;
   scratch32[2] = arg;
   scratch32[3] = -1;
@@ -47,10 +46,9 @@ function send(promiseId, opId, arg, zeroCopy = null) {
 
 /** Returns Promise<number> */
 function sendAsync(opId, arg, zeroCopy = null) {
-  const promiseId = nextPromiseId++;
+  const promiseId = send(false, opId, arg, zeroCopy);
   const p = createResolvable();
   promiseMap.set(promiseId, p);
-  send(promiseId, opId, arg, zeroCopy);
   return p;
 }
 
@@ -58,7 +56,7 @@ function recordFromBuf(buf) {
   assert(buf.byteLength === 16);
   const buf32 = new Int32Array(buf.buffer, buf.byteOffset, buf.byteLength / 4);
   return {
-    promiseId: buf32[0],
+    isSync: !!buf32[0],
     opId: buf32[1],
     arg: buf32[2],
     result: buf32[3]
@@ -67,14 +65,14 @@ function recordFromBuf(buf) {
 
 /** Returns i32 number */
 function sendSync(opId, arg) {
-  const buf = send(0, opId, arg);
+  const buf = send(true, opId, arg);
   const record = recordFromBuf(buf);
   return record.result;
 }
 
-function handleAsyncMsgFromRust(buf) {
+function handleAsyncMsgFromRust(promiseId, buf) {
   const record = recordFromBuf(buf);
-  const { promiseId, result } = record;
+  const { result } = record;
   const p = promiseMap.get(promiseId);
   promiseMap.delete(promiseId);
   p.resolve(result);