1 files changed, 26 insertions, 0 deletions
diff --git a/src/postamble.js b/src/postamble.js
index d164f049..86c990e8 100644
--- a/src/postamble.js
+++ b/src/postamble.js
@@ -113,3 +113,29 @@ if (shouldRunNow) {
 
 // {{POST_RUN_ADDITIONS}}
 
+#if BUILD_AS_WORKER
+
+var buffer = 0, bufferSize = 0;
+var inWorkerCall = false, workerResponded = false, workerCallbackId = -1;
+
+onmessage = function(msg) {
+  var func = Module['_' + msg.data.funcName];
+  if (!func) throw 'invalid worker function to call: ' + msg.data.funcName;
+  var data = msg.data.data;
+  if (!data.byteLength) data = new Uint8Array(data);
+  if (!buffer || bufferSize < data.length) {
+    if (buffer) _free(buffer);
+    bufferSize = data.length;
+    buffer = _malloc(data.length);
+  }
+  HEAPU8.set(data, buffer);
+
+  inWorkerCall = true;
+  workerResponded = false;
+  workerCallbackId = msg.data.callbackId;
+  func(buffer, data.length);
+  inWorkerCall = false;
+}
+
+#endif
+