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diff --git a/examples/web/physac/physics_friction.worker.js b/examples/web/physac/physics_friction.worker.js
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+++ b/examples/web/physac/physics_friction.worker.js
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+// Copyright 2015 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+// Pthread Web Worker startup routine:
+// This is the entry point file that is loaded first by each Web Worker
+// that executes pthreads on the Emscripten application.
+
+// Thread-local:
+var threadInfoStruct = 0; // Info area for this thread in Emscripten HEAP (shared). If zero, this worker is not currently hosting an executing pthread.
+var selfThreadId = 0; // The ID of this thread. 0 if not hosting a pthread.
+var parentThreadId = 0; // The ID of the parent pthread that launched this thread.
+var tempDoublePtr = 0; // A temporary memory area for global float and double marshalling operations.
+
+// Thread-local: Each thread has its own allocated stack space.
+var STACK_BASE = 0;
+var STACKTOP = 0;
+var STACK_MAX = 0;
+
+// These are system-wide memory area parameters that are set at main runtime startup in main thread, and stay constant throughout the application.
+var buffer; // All pthreads share the same Emscripten HEAP as SharedArrayBuffer with the main execution thread.
+var DYNAMICTOP_PTR = 0;
+var DYNAMIC_BASE = 0;
+
+var ENVIRONMENT_IS_PTHREAD = true;
+var PthreadWorkerInit = {};
+
+// performance.now() is specced to return a wallclock time in msecs since that Web Worker/main thread launched. However for pthreads this can cause
+// subtle problems in emscripten_get_now() as this essentially would measure time from pthread_create(), meaning that the clocks between each threads
+// would be wildly out of sync. Therefore sync all pthreads to the clock on the main browser thread, so that different threads see a somewhat
+// coherent clock across each of them (+/- 0.1msecs in testing)
+var __performance_now_clock_drift = 0;
+
+// Cannot use console.log or console.error in a web worker, since that would risk a browser deadlock! https://bugzilla.mozilla.org/show_bug.cgi?id=1049091
+// Therefore implement custom logging facility for threads running in a worker, which queue the messages to main thread to print.
+var Module = {};
+
+
+// When error objects propagate from Web Worker to main thread, they lose helpful call stack and thread ID information, so print out errors early here,
+// before that happens.
+this.addEventListener('error', function(e) {
+  if (e.message.indexOf('SimulateInfiniteLoop') != -1) return e.preventDefault();
+
+  var errorSource = ' in ' + e.filename + ':' + e.lineno + ':' + e.colno;
+  console.error('Pthread ' + selfThreadId + ' uncaught exception' + (e.filename || e.lineno || e.colno ? errorSource : "") + ': ' + e.message + '. Error object:');
+  console.error(e.error);
+});
+
+function threadPrint() {
+  var text = Array.prototype.slice.call(arguments).join(' ');
+  console.log(text);
+}
+function threadPrintErr() {
+  var text = Array.prototype.slice.call(arguments).join(' ');
+  console.error(text);
+  console.error(new Error().stack);
+}
+function threadAlert() {
+  var text = Array.prototype.slice.call(arguments).join(' ');
+  postMessage({cmd: 'alert', text: text, threadId: selfThreadId});
+}
+out = threadPrint;
+err = threadPrintErr;
+this.alert = threadAlert;
+
+Module['instantiateWasm'] = function(info, receiveInstance) {
+  // Instantiate from the module posted from the main thread.
+  // We can just use sync instantiation in the worker.
+  instance = new WebAssembly.Instance(wasmModule, info);
+  // We don't need the module anymore; new threads will be spawned from the main thread.
+  wasmModule = null;
+  receiveInstance(instance); // The second 'module' parameter is intentionally null here, we don't need to keep a ref to the Module object from here.
+  return instance.exports;
+}
+
+var wasmModule;
+var wasmMemory;
+
+this.onmessage = function(e) {
+  try {
+    if (e.data.cmd === 'load') { // Preload command that is called once per worker to parse and load the Emscripten code.
+      // Initialize the thread-local field(s):
+      tempDoublePtr = e.data.tempDoublePtr;
+
+      // Initialize the global "process"-wide fields:
+      DYNAMIC_BASE = e.data.DYNAMIC_BASE;
+      DYNAMICTOP_PTR = e.data.DYNAMICTOP_PTR;
+
+      // The Wasm module will have import fields for STACKTOP and STACK_MAX. At 'load' stage of Worker startup, we are just
+      // spawning this Web Worker to act as a host for future created pthreads, i.e. we do not have a pthread to start up here yet.
+      // (A single Worker can also host multiple pthreads throughout its lifetime, shutting down a pthread will not shut down its hosting Worker,
+      // but the Worker is reused for later spawned pthreads). The 'run' stage below will actually start running a pthread.
+      // The stack space for a pthread is allocated and deallocated when a pthread is actually run, not yet at Worker 'load' stage.
+      // However, the WebAssembly module we are loading up here has import fields for STACKTOP and STACK_MAX, which it needs to get filled in
+      // immediately at Wasm Module instantiation time. The values of these will not get used until pthread is actually running some code, so
+      // we'll proceed to set up temporary invalid values for these fields for import purposes. Then whenever a pthread is launched at 'run' stage
+      // below, these values are rewritten to establish proper stack area for the particular pthread.
+      Module['STACK_MAX'] = Module['STACKTOP']  = 0x7FFFFFFF;
+
+      // Module and memory were sent from main thread
+      wasmModule = e.data.wasmModule;
+      wasmMemory = e.data.wasmMemory;
+      buffer = wasmMemory.buffer;
+
+      PthreadWorkerInit = e.data.PthreadWorkerInit;
+
+      if (typeof e.data.urlOrBlob === 'string') {
+        importScripts(e.data.urlOrBlob);
+      } else {
+        var objectUrl = URL.createObjectURL(e.data.urlOrBlob);
+        importScripts(objectUrl);
+        URL.revokeObjectURL(objectUrl);
+      }
+
+
+      if (typeof FS !== 'undefined' && typeof FS.createStandardStreams === 'function') FS.createStandardStreams();
+      postMessage({ cmd: 'loaded' });
+    } else if (e.data.cmd === 'objectTransfer') {
+      PThread.receiveObjectTransfer(e.data);
+    } else if (e.data.cmd === 'run') { // This worker was idle, and now should start executing its pthread entry point.
+      __performance_now_clock_drift = performance.now() - e.data.time; // Sync up to the clock of the main thread.
+      threadInfoStruct = e.data.threadInfoStruct;
+      __register_pthread_ptr(threadInfoStruct, /*isMainBrowserThread=*/0, /*isMainRuntimeThread=*/0); // Pass the thread address inside the asm.js scope to store it for fast access that avoids the need for a FFI out.
+      selfThreadId = e.data.selfThreadId;
+      parentThreadId = e.data.parentThreadId;
+      // Establish the stack frame for this thread in global scope
+      STACK_BASE = STACKTOP = e.data.stackBase;
+      STACK_MAX = STACK_BASE + e.data.stackSize;
+      // Call inside asm.js/wasm module to set up the stack frame for this pthread in asm.js/wasm module scope
+      Module['establishStackSpace'](e.data.stackBase, e.data.stackBase + e.data.stackSize);
+
+      PThread.receiveObjectTransfer(e.data);
+      PThread.setThreadStatus(_pthread_self(), 1/*EM_THREAD_STATUS_RUNNING*/);
+
+      try {
+        // pthread entry points are always of signature 'void *ThreadMain(void *arg)'
+        // Native codebases sometimes spawn threads with other thread entry point signatures,
+        // such as void ThreadMain(void *arg), void *ThreadMain(), or void ThreadMain().
+        // That is not acceptable per C/C++ specification, but x86 compiler ABI extensions
+        // enable that to work. If you find the following line to crash, either change the signature
+        // to "proper" void *ThreadMain(void *arg) form, or try linking with the Emscripten linker
+        // flag -s EMULATE_FUNCTION_POINTER_CASTS=1 to add in emulation for this x86 ABI extension.
+        var result = Module['dynCall_ii'](e.data.start_routine, e.data.arg);
+
+
+      } catch(e) {
+        if (e === 'Canceled!') {
+          PThread.threadCancel();
+          return;
+        } else if (e === 'SimulateInfiniteLoop' || e === 'pthread_exit') {
+          return;
+        } else {
+          Atomics.store(HEAPU32, (threadInfoStruct + 4 /*C_STRUCTS.pthread.threadExitCode*/ ) >> 2, (e instanceof ExitStatus) ? e.status : -2 /*A custom entry specific to Emscripten denoting that the thread crashed.*/);
+          Atomics.store(HEAPU32, (threadInfoStruct + 0 /*C_STRUCTS.pthread.threadStatus*/ ) >> 2, 1); // Mark the thread as no longer running.
+          _emscripten_futex_wake(threadInfoStruct + 0 /*C_STRUCTS.pthread.threadStatus*/, 0x7FFFFFFF/*INT_MAX*/); // Wake all threads waiting on this thread to finish.
+          if (!(e instanceof ExitStatus)) throw e;
+        }
+      }
+      // The thread might have finished without calling pthread_exit(). If so, then perform the exit operation ourselves.
+      // (This is a no-op if explicit pthread_exit() had been called prior.)
+      if (!Module['noExitRuntime']) PThread.threadExit(result);
+    } else if (e.data.cmd === 'cancel') { // Main thread is asking for a pthread_cancel() on this thread.
+      if (threadInfoStruct && PThread.thisThreadCancelState == 0/*PTHREAD_CANCEL_ENABLE*/) {
+        PThread.threadCancel();
+      }
+    } else if (e.data.target === 'setimmediate') {
+      // no-op
+    } else if (e.data.cmd === 'processThreadQueue') {
+      if (threadInfoStruct) { // If this thread is actually running?
+        _emscripten_current_thread_process_queued_calls();
+      }
+    } else {
+      err('worker.js received unknown command ' + e.data.cmd);
+      console.error(e.data);
+    }
+  } catch(e) {
+    console.error('worker.js onmessage() captured an uncaught exception: ' + e);
+    console.error(e.stack);
+    throw e;
+  }
+}
+
+