text: /**
   * @license
   * Copyright 2015 The Emscripten Authors
   * SPDX-License-Identifier: MIT
   */
  
  var LibraryPThread = {
    $PThread__postset: 'if (!ENVIRONMENT_IS_PTHREAD) PThread.initMainThread();',
    $PThread__deps: ['_emscripten_thread_init',
                     '$killThread',
                     '$cancelThread', '$cleanupThread', '$zeroMemory',
                     '_emscripten_thread_free_data',
                     'exit',
  #if !MINIMAL_RUNTIME
                     '$handleException',
  #endif
                     ],
    $PThread: {
      // Contains all Workers that are idle/unused and not currently hosting an
      // executing pthread.  Unused Workers can either be pooled up before page
      // startup, but also when a pthread quits, its hosting Worker is not
      // terminated, but is returned to this pool as an optimization so that
      // starting the next thread is faster.
      unusedWorkers: [],
      // Contains all Workers that are currently hosting an active pthread.
      runningWorkers: [],
      tlsInitFunctions: [],
      initMainThread: function() {
  #if ASSERTIONS
        assert(!ENVIRONMENT_IS_PTHREAD);
  #endif
  
  #if PTHREAD_POOL_SIZE
        var pthreadPoolSize = {{{ PTHREAD_POOL_SIZE }}};
        // Start loading up the Worker pool, if requested.
        for (var i = 0; i < pthreadPoolSize; ++i) {
          PThread.allocateUnusedWorker();
        }
  #endif
      },
  
      initWorker: function() {
  #if USE_CLOSURE_COMPILER
        // worker.js is not compiled together with us, and must access certain
        // things.
        PThread['receiveObjectTransfer'] = PThread.receiveObjectTransfer;
        PThread['threadInit'] = PThread.threadInit;
  #if !MINIMAL_RUNTIME
        PThread['setExitStatus'] = PThread.setExitStatus;
  #endif
  #endif
      },
      // Maps pthread_t to pthread info objects
      pthreads: {},
  
  #if PTHREADS_PROFILING
      getThreadName: function(pthreadPtr) {
        var profilerBlock = {{{ makeGetValue('pthreadPtr', C_STRUCTS.pthread.profilerBlock, POINTER_TYPE) }}};
        if (!profilerBlock) return "";
        return UTF8ToString(profilerBlock + {{{ C_STRUCTS.thread_profiler_block.name }}});
      },
  
      threadStatusToString: function(threadStatus) {
        switch (threadStatus) {
          case 0: return "not yet started";
          case 1: return "running";
          case 2: return "sleeping";
          case 3: return "waiting for a futex";
          case 4: return "waiting for a mutex";
          case 5: return "waiting for a proxied operation";
          case 6: return "finished execution";
          default: return "unknown (corrupt?!)";
        }
      },
  
      threadStatusAsString: function(pthreadPtr) {
        var profilerBlock = {{{ makeGetValue('pthreadPtr', C_STRUCTS.pthread.profilerBlock, POINTER_TYPE) }}};
        var status = (profilerBlock == 0) ? 0 : Atomics.load(HEAPU32, (profilerBlock + {{{ C_STRUCTS.thread_profiler_block.threadStatus }}} ) >> 2);
        return PThread.threadStatusToString(status);
      },
  #endif
  
  #if !MINIMAL_RUNTIME
      setExitStatus: function(status) {
        EXITSTATUS = status;
      },
  #endif
  
      terminateAllThreads: function() {
  #if ASSERTIONS
        assert(!ENVIRONMENT_IS_PTHREAD, 'Internal Error! terminateAllThreads() can only ever be called from main application thread!');
  #endif
  #if PTHREADS_DEBUG
        err('terminateAllThreads');
  #endif
        for (var t in PThread.pthreads) {
          var pthread = PThread.pthreads[t];
          if (pthread && pthread.worker) {
            PThread.returnWorkerToPool(pthread.worker);
          }
        }
  
  #if ASSERTIONS
        // At this point there should be zero pthreads and zero runningWorkers.
        // All workers should be now be the unused queue.
        assert(Object.keys(PThread.pthreads).length === 0);
        assert(PThread.runningWorkers.length === 0);
  #endif
  
        for (var i = 0; i < PThread.unusedWorkers.length; ++i) {
          var worker = PThread.unusedWorkers[i];
  #if ASSERTIONS
          // This Worker should not be hosting a pthread at this time.
          assert(!worker.pthread);
  #endif
          worker.terminate();
        }
        PThread.unusedWorkers = [];
      },
      returnWorkerToPool: function(worker) {
        // We don't want to run main thread queued calls here, since we are doing
        // some operations that leave the worker queue in an invalid state until
        // we are completely done (it would be bad if free() ends up calling a
        // queued pthread_create which looks at the global data structures we are
        // modifying).
        PThread.runWithoutMainThreadQueuedCalls(function() {
          delete PThread.pthreads[worker.pthread.threadInfoStruct];
          // Note: worker is intentionally not terminated so the pool can
          // dynamically grow.
          PThread.unusedWorkers.push(worker);
          PThread.runningWorkers.splice(PThread.runningWorkers.indexOf(worker), 1);
          // Not a running Worker anymore
          __emscripten_thread_free_data(worker.pthread.threadInfoStruct);
          // Detach the worker from the pthread object, and return it to the
          // worker pool as an unused worker.
          worker.pthread = undefined;
        });
      },
      // Runs a function with processing of queued calls to the main thread
      // disabled. This is useful to avoid something like free() ending up waiting
      // for a lock, then running processing events, and those events can end up
      // doing things that interfere with what we were doing before (for example,
      // if we are tearing down a thread, calling free to erase its data could
      // end up calling a proxied pthread_create, which gets a free worker, and
      // can interfere).
      // This is only safe to call if we do not need queued calls to run. That is
      // the case when doing something like free(), which just needs the malloc
      // lock to be released.
      runWithoutMainThreadQueuedCalls: function(func) {
  #if ASSERTIONS
        assert(PThread.mainRuntimeThread, 'runWithoutMainThreadQueuedCalls must be done on the main runtime thread');
        assert(__emscripten_allow_main_runtime_queued_calls);
  #endif
        HEAP32[__emscripten_allow_main_runtime_queued_calls >> 2] = 0;
        try {
          func();
        } finally {
          HEAP32[__emscripten_allow_main_runtime_queued_calls >> 2] = 1;
        }
      },
      receiveObjectTransfer: function(data) {
  #if OFFSCREENCANVAS_SUPPORT
        if (typeof GL !== 'undefined') {
          for (var i in data.offscreenCanvases) {
            GL.offscreenCanvases[i] = data.offscreenCanvases[i];
          }
          if (!Module['canvas'] && data.moduleCanvasId && GL.offscreenCanvases[data.moduleCanvasId]) {
            Module['canvas'] = GL.offscreenCanvases[data.moduleCanvasId].offscreenCanvas;
            Module['canvas'].id = data.moduleCanvasId;
          }
        }
  #endif
      },
      // Called by worker.js each time a thread is started.
      threadInit: function() {
  #if PTHREADS_DEBUG
        err('Pthread 0x' + _pthread_self().toString(16) + ' threadInit.');
  #endif
        // Call thread init functions (these are the emscripten_tls_init for each
        // module loaded.
        for (var i in PThread.tlsInitFunctions) {
          PThread.tlsInitFunctions[i]();
        }
      },
      // Loads the WebAssembly module into the given list of Workers.
      // onFinishedLoading: A callback function that will be called once all of
      //                    the workers have been initialized and are
      //                    ready to host pthreads.
      loadWasmModuleToWorker: function(worker, onFinishedLoading) {
        worker.onmessage = (e) => {
          var d = e['data'];
          var cmd = d['cmd'];
          // Sometimes we need to backproxy events to the calling thread (e.g.
          // HTML5 DOM events handlers such as
          // emscripten_set_mousemove_callback()), so keep track in a globally
          // accessible variable about the thread that initiated the proxying.
          if (worker.pthread) PThread.currentProxiedOperationCallerThread = worker.pthread.threadInfoStruct;
  
          // If this message is intended to a recipient that is not the main thread, forward it to the target thread.
          if (d['targetThread'] && d['targetThread'] != _pthread_self()) {
            var thread = PThread.pthreads[d.targetThread];
            if (thread) {
              thread.worker.postMessage(d, d['transferList']);
            } else {
              err('Internal error! Worker sent a message "' + cmd + '" to target pthread ' + d['targetThread'] + ', but that thread no longer exists!');
            }
            PThread.currentProxiedOperationCallerThread = undefined;
            return;
          }
  
          if (cmd === 'processQueuedMainThreadWork') {
            // TODO: Must post message to main Emscripten thread in PROXY_TO_WORKER mode.
            _emscripten_main_thread_process_queued_calls();
          } else if (cmd === 'spawnThread') {
            spawnThread(d);
          } else if (cmd === 'cleanupThread') {
            cleanupThread(d['thread']);
          } else if (cmd === 'killThread') {
            killThread(d['thread']);
          } else if (cmd === 'cancelThread') {
            cancelThread(d['thread']);
          } else if (cmd === 'loaded') {
            worker.loaded = true;
            if (onFinishedLoading) onFinishedLoading(worker);
            // If this Worker is already pending to start running a thread, launch the thread now
            if (worker.runPthread) {
              worker.runPthread();
              delete worker.runPthread;
            }
          } else if (cmd === 'print') {
            out('Thread ' + d['threadId'] + ': ' + d['text']);
          } else if (cmd === 'printErr') {
            err('Thread ' + d['threadId'] + ': ' + d['text']);
          } else if (cmd === 'alert') {
            alert('Thread ' + d['threadId'] + ': ' + d['text']);
          } else if (d.target === 'setimmediate') {
            // Worker wants to postMessage() to itself to implement setImmediate()
            // emulation.
            worker.postMessage(d);
          } else if (cmd === 'onAbort') {
            if (Module['onAbort']) {
              Module['onAbort'](d['arg']);
            }
          } else {
            err("worker sent an unknown command " + cmd);
          }
          PThread.currentProxiedOperationCallerThread = undefined;
        };
  
        worker.onerror = (e) => {
          var message = 'worker sent an error!';
  #if ASSERTIONS
          if (worker.pthread) {
            var pthread_ptr = worker.pthread.threadInfoStruct;
            if (pthread_ptr) {
              message = 'Pthread 0x' + pthread_ptr.toString(16) + ' sent an error!';
            }
          }
  #endif
          err(message + ' ' + e.filename + ':' + e.lineno + ': ' + e.message);
          throw e;
        };
  
  #if ENVIRONMENT_MAY_BE_NODE
        if (ENVIRONMENT_IS_NODE) {
          worker.on('message', function(data) {
            worker.onmessage({ data: data });
          });
          worker.on('error', function(e) {
            worker.onerror(e);
          });
          worker.on('detachedExit', function() {
            // TODO: update the worker queue?
            // See: https://github.com/emscripten-core/emscripten/issues/9763
          });
        }
  #endif
  
  #if ASSERTIONS
        assert(wasmMemory instanceof WebAssembly.Memory, 'WebAssembly memory should have been loaded by now!');
        assert(wasmModule instanceof WebAssembly.Module, 'WebAssembly Module should have been loaded by now!');
  #endif
  
        // Ask the new worker to load up the Emscripten-compiled page. This is a heavy operation.
        worker.postMessage({
          'cmd': 'load',
          // If the application main .js file was loaded from a Blob, then it is not possible
          // to access the URL of the current script that could be passed to a Web Worker so that
          // it could load up the same file. In that case, developer must either deliver the Blob
          // object in Module['mainScriptUrlOrBlob'], or a URL to it, so that pthread Workers can
          // independently load up the same main application file.
          'urlOrBlob': Module['mainScriptUrlOrBlob']
  #if !EXPORT_ES6
          || _scriptDir
  #endif
          ,
  #if WASM2JS
          // the polyfill WebAssembly.Memory instance has function properties,
          // which will fail in postMessage, so just send a custom object with the
          // property we need, the buffer
          'wasmMemory': { 'buffer': wasmMemory.buffer },
  #else // WASM2JS
          'wasmMemory': wasmMemory,
  #endif // WASM2JS
          'wasmModule': wasmModule,
  #if LOAD_SOURCE_MAP
          'wasmSourceMap': wasmSourceMap,
  #endif
  #if USE_OFFSET_CONVERTER
          'wasmOffsetConverter': wasmOffsetConverter,
  #endif
  #if MAIN_MODULE
          'dynamicLibraries': Module['dynamicLibraries'],
  #endif
        });
      },
  
      // Creates a new web Worker and places it in the unused worker pool to wait for its use.
      allocateUnusedWorker: function() {
  #if MINIMAL_RUNTIME
        var pthreadMainJs = Module['worker'];
  #else
  #if EXPORT_ES6 && USE_ES6_IMPORT_META
        // If we're using module output and there's no explicit override, use bundler-friendly pattern.
        if (!Module['locateFile']) {
  #if PTHREADS_DEBUG
          err('Allocating a new web worker from ' + new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url));
  #endif
  #if TRUSTED_TYPES
          // Use Trusted Types compatible wrappers.
          if (typeof trustedTypes !== 'undefined' && trustedTypes.createPolicy) {
            var p = trustedTypes.createPolicy(
              'emscripten#workerPolicy1',
              {
                createScriptURL: function(ignored) {
                  return new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url);
                }
              }
            );
            PThread.unusedWorkers.push(new Worker(p.createScriptURL('ignored')));
          } else
   #endif
          PThread.unusedWorkers.push(new Worker(new URL('{{{ PTHREAD_WORKER_FILE }}}', import.meta.url)));
          return;
        }
  #endif
        // Allow HTML module to configure the location where the 'worker.js' file will be loaded from,
        // via Module.locateFile() function. If not specified, then the default URL 'worker.js' relative
        // to the main html file is loaded.
        var pthreadMainJs = locateFile('{{{ PTHREAD_WORKER_FILE }}}');
  #endif
  #if PTHREADS_DEBUG
        err('Allocating a new web worker from ' + pthreadMainJs);
  #endif
  #if TRUSTED_TYPES
        // Use Trusted Types compatible wrappers.
        if (typeof trustedTypes !== 'undefined' && trustedTypes.createPolicy) {
          var p = trustedTypes.createPolicy('emscripten#workerPolicy2', { createScriptURL: function(ignored) { return pthreadMainJs } });
          PThread.unusedWorkers.push(new Worker(p.createScriptURL('ignored')));
        } else
  #endif
        PThread.unusedWorkers.push(new Worker(pthreadMainJs));
      },
  
      getNewWorker: function() {
        if (PThread.unusedWorkers.length == 0) {
  #if !PROXY_TO_PTHREAD && PTHREAD_POOL_SIZE_STRICT
  #if ASSERTIONS
          err('Tried to spawn a new thread, but the thread pool is exhausted.\n' +
          'This might result in a deadlock unless some threads eventually exit or the code explicitly breaks out to the event loop.\n' +
          'If you want to increase the pool size, use setting `-s PTHREAD_POOL_SIZE=...`.'
  #if PTHREAD_POOL_SIZE_STRICT == 1
          + '\nIf you want to throw an explicit error instead of the risk of deadlocking in those cases, use setting `-s PTHREAD_POOL_SIZE_STRICT=2`.'
  #endif
          );
  #endif // ASSERTIONS
  
  #if PTHREAD_POOL_SIZE_STRICT == 2
          // Don't return a Worker, which will translate into an EAGAIN error.
          return;
  #endif
  #endif
          PThread.allocateUnusedWorker();
          PThread.loadWasmModuleToWorker(PThread.unusedWorkers[0]);
        }
        return PThread.unusedWorkers.pop();
      }
    },
  
    $killThread__deps: ['_emscripten_thread_free_data'],
    $killThread: function(pthread_ptr) {
  #if PTHREADS_DEBUG
      err('killThread 0x' + pthread_ptr.toString(16));
  #endif
  #if ASSERTIONS
      assert(!ENVIRONMENT_IS_PTHREAD, 'Internal Error! killThread() can only ever be called from main application thread!');
      assert(pthread_ptr, 'Internal Error! Null pthread_ptr in killThread!');
  #endif
      {{{ makeSetValue('pthread_ptr', C_STRUCTS.pthread.self, 0, 'i32') }}};
      var pthread = PThread.pthreads[pthread_ptr];
      delete PThread.pthreads[pthread_ptr];
      pthread.worker.terminate();
      __emscripten_thread_free_data(pthread_ptr);
      // The worker was completely nuked (not just the pthread execution it was hosting), so remove it from running workers
      // but don't put it back to the pool.
      PThread.runningWorkers.splice(PThread.runningWorkers.indexOf(pthread.worker), 1); // Not a running Worker anymore.
      pthread.worker.pthread = undefined;
    },
  
    __emscripten_thread_cleanup: function(thread) {
      // Called when a thread needs to be cleaned up so it can be reused.
      // A thread is considered reusable when it either returns from its
      // entry point, calls pthread_exit, or acts upon a cancellation.
      // Detached threads are responsible for calling this themselves,
      // otherwise pthread_join is responsible for calling this.
      if (!ENVIRONMENT_IS_PTHREAD) cleanupThread(thread);
      else postMessage({ 'cmd': 'cleanupThread', 'thread': thread });
    },
  
    $cleanupThread: function(pthread_ptr) {
  #if ASSERTIONS
      assert(!ENVIRONMENT_IS_PTHREAD, 'Internal Error! cleanupThread() can only ever be called from main application thread!');
      assert(pthread_ptr, 'Internal Error! Null pthread_ptr in cleanupThread!');
  #endif
      var pthread = PThread.pthreads[pthread_ptr];
      // If pthread has been removed from this map this also means that pthread_ptr points
      // to already freed data. Such situation may occur in following circumstance:
      // Joining thread from non-main browser thread (this also includes thread running main()
      // when compiled with `PROXY_TO_PTHREAD`) - in such situation it may happen that following
      // code flow occur (MB - Main Browser Thread, S1, S2 - Worker Threads):
      // S2: thread ends, 'exit' message is sent to MB
      // S1: calls pthread_join(S2), this causes:
      //     a. S2 is marked as detached,
      //     b. 'cleanupThread' message is sent to MB.
      // MB: handles 'exit' message, as thread is detached, so returnWorkerToPool()
      //     is called and all thread related structs are freed/released.
      // MB: handles 'cleanupThread' message which calls this function.
      if (pthread) {
        {{{ makeSetValue('pthread_ptr', C_STRUCTS.pthread.self, 0, 'i32') }}};
        var worker = pthread.worker;
        PThread.returnWorkerToPool(worker);
      }
    },
  
    $registerTlsInit: function(tlsInitFunc, moduleExports, metadata) {
  #if DYLINK_DEBUG
      err("registerTlsInit: " + tlsInitFunc);
  #endif
  #if RELOCATABLE
      // In relocatable builds, we use the result of calling tlsInitFunc
      // (`emscripten_tls_init`) to relocate the TLS exports of the module
      // according to this new __tls_base.
      function tlsInitWrapper() {
        var __tls_base = tlsInitFunc();
  #if DYLINK_DEBUG
        err('tlsInit -> ' + __tls_base);
  #endif
        if (!__tls_base) {
  #if ASSERTIONS
          // __tls_base should never be zero if there are tls exports
          assert(__tls_base || Object.keys(metadata.tlsExports).length == 0);
  #endif
          return;
        }
        for (var sym in metadata.tlsExports) {
          metadata.tlsExports[sym] = moduleExports[sym];
        }
        relocateExports(metadata.tlsExports, __tls_base, /*replace=*/true);
      }
  
      // Register this function so that its gets called for each thread on
      // startup.
      PThread.tlsInitFunctions.push(tlsInitWrapper);
  
      // If the main thread is already running we also need to call this function
      // now.  If the main thread is not yet running this will happen when it
      // is initialized and processes `PThread.tlsInitFunctions`.
      if (runtimeInitialized) {
        tlsInitWrapper();
      }
  #else
      PThread.tlsInitFunctions.push(tlsInitFunc);
  #endif
    },
  
    $cancelThread: function(pthread_ptr) {
  #if ASSERTIONS
      assert(!ENVIRONMENT_IS_PTHREAD, 'Internal Error! cancelThread() can only ever be called from main application thread!');
      assert(pthread_ptr, 'Internal Error! Null pthread_ptr in cancelThread!');
  #endif
      var pthread = PThread.pthreads[pthread_ptr];
      pthread.worker.postMessage({ 'cmd': 'cancel' });
    },
  
    $spawnThread: function(threadParams) {
  #if ASSERTIONS
      assert(!ENVIRONMENT_IS_PTHREAD, 'Internal Error! spawnThread() can only ever be called from main application thread!');
      assert(threadParams.pthread_ptr, 'Internal error, no pthread ptr!');
  #endif
  
      var worker = PThread.getNewWorker();
      if (!worker) {
        // No available workers in the PThread pool.
        return {{{ cDefine('EAGAIN') }}};
      }
  #if ASSERTIONS
      assert(!worker.pthread, 'Internal error!');
  #endif
  
      PThread.runningWorkers.push(worker);
  
      // Create a pthread info object to represent this thread.
      var pthread = PThread.pthreads[threadParams.pthread_ptr] = {
        worker: worker,
        // Info area for this thread in Emscripten HEAP (shared)
        threadInfoStruct: threadParams.pthread_ptr
      };
  
      worker.pthread = pthread;
      var msg = {
          'cmd': 'run',
          'start_routine': threadParams.startRoutine,
          'arg': threadParams.arg,
          'threadInfoStruct': threadParams.pthread_ptr,
      };
  #if OFFSCREENCANVAS_SUPPORT
      // Note that we do not need to quote these names because they are only used
      // in this file, and not from the external worker.js.
      msg.moduleCanvasId = threadParams.moduleCanvasId;
      msg.offscreenCanvases = threadParams.offscreenCanvases;
  #endif
      worker.runPthread = () => {
        // Ask the worker to start executing its pthread entry point function.
        msg.time = performance.now();
        worker.postMessage(msg, threadParams.transferList);
      };
      if (worker.loaded) {
        worker.runPthread();
        delete worker.runPthread;
      }
      return 0;
    },
  
    emscripten_has_threading_support: function() {
      return typeof SharedArrayBuffer !== 'undefined';
    },
  
    emscripten_num_logical_cores: function() {
  #if ENVIRONMENT_MAY_BE_NODE
      if (ENVIRONMENT_IS_NODE) return require('os').cpus().length;
  #endif
      return navigator['hardwareConcurrency'];
    },
  
    __emscripten_init_main_thread_js: function(tb) {
      // Pass the thread address to the native code where they stored in wasm
      // globals which act as a form of TLS. Global constructors trying
      // to access this value will read the wrong value, but that is UB anyway.
      __emscripten_thread_init(
        tb,
        /*isMainBrowserThread=*/!ENVIRONMENT_IS_WORKER,
        /*isMainRuntimeThread=*/1,
        /*canBlock=*/!ENVIRONMENT_IS_WEB,
  #if PTHREADS_PROFILING
        /*start_profiling=*/true
  #endif
      );
  #if ASSERTIONS
      PThread.mainRuntimeThread = true;
      // Verify that this native symbol used by futex_wait/wake is exported correctly.
      assert(__emscripten_main_thread_futex > 0);
  #endif
      PThread.threadInit();
    },
  
    // ASan wraps the emscripten_builtin_pthread_create call in
    // __lsan::ScopedInterceptorDisabler.  Unfortunately, that only disables it on
    // the thread that made the call.  __pthread_create_js gets proxied to the
    // main thread, where LSan is not disabled. This makes it necessary for us to
    // disable LSan here (using __noleakcheck), so that it does not detect
    // pthread's internal allocations as leaks.  If/when we remove all the
    // allocations from __pthread_create_js we could also remove this.
    __pthread_create_js__noleakcheck: true,
    __pthread_create_js__sig: 'iiiii',
    __pthread_create_js__deps: ['$spawnThread', 'pthread_self', 'memalign', 'emscripten_sync_run_in_main_thread_4'],
    __pthread_create_js: function(pthread_ptr, attr, start_routine, arg) {
      if (typeof SharedArrayBuffer === 'undefined') {
        err('Current environment does not support SharedArrayBuffer, pthreads are not available!');
        return {{{ cDefine('EAGAIN') }}};
      }
  
      // List of JS objects that will transfer ownership to the Worker hosting the thread
      var transferList = [];
      var error = 0;
  
  #if OFFSCREENCANVAS_SUPPORT
      // Deduce which WebGL canvases (HTMLCanvasElements or OffscreenCanvases) should be passed over to the
      // Worker that hosts the spawned pthread.
      // Comma-delimited list of CSS selectors that must identify canvases by IDs: "#canvas1, #canvas2, ..."
      var transferredCanvasNames = attr ? {{{ makeGetValue('attr', C_STRUCTS.pthread_attr_t._a_transferredcanvases, POINTER_TYPE) }}} : 0;
  #if OFFSCREENCANVASES_TO_PTHREAD
      // Proxied canvases string pointer -1 is used as a special token to fetch
      // whatever canvases were passed to build in -s
      // OFFSCREENCANVASES_TO_PTHREAD= command line.
      if (transferredCanvasNames == -1) transferredCanvasNames = '{{{ OFFSCREENCANVASES_TO_PTHREAD }}}';
      else
  #endif
      if (transferredCanvasNames) transferredCanvasNames = UTF8ToString(transferredCanvasNames).trim();
      if (transferredCanvasNames) transferredCanvasNames = transferredCanvasNames.split(',');
  #if GL_DEBUG
      err('pthread_create: transferredCanvasNames="' + transferredCanvasNames + '"');
  #endif
  
      var offscreenCanvases = {}; // Dictionary of OffscreenCanvas objects we'll transfer to the created thread to own
      var moduleCanvasId = Module['canvas'] ? Module['canvas'].id : '';
      for (var i in transferredCanvasNames) {
        var name = transferredCanvasNames[i].trim();
        var offscreenCanvasInfo;
        try {
          if (name == '#canvas') {
            if (!Module['canvas']) {
              err('pthread_create: could not find canvas with ID "' + name + '" to transfer to thread!');
              error = {{{ cDefine('EINVAL') }}};
              break;
            }
            name = Module['canvas'].id;
          }
  #if ASSERTIONS
          assert(typeof GL === 'object', 'OFFSCREENCANVAS_SUPPORT assumes GL is in use (you can force-include it with -s \'DEFAULT_LIBRARY_FUNCS_TO_INCLUDE=["$GL"]\')');
  #endif
          if (GL.offscreenCanvases[name]) {
            offscreenCanvasInfo = GL.offscreenCanvases[name];
            GL.offscreenCanvases[name] = null; // This thread no longer owns this canvas.
            if (Module['canvas'] instanceof OffscreenCanvas && name === Module['canvas'].id) Module['canvas'] = null;
          } else if (!ENVIRONMENT_IS_PTHREAD) {
            var canvas = (Module['canvas'] && Module['canvas'].id === name) ? Module['canvas'] : document.querySelector(name);
            if (!canvas) {
              err('pthread_create: could not find canvas with ID "' + name + '" to transfer to thread!');
              error = {{{ cDefine('EINVAL') }}};
              break;
            }
            if (canvas.controlTransferredOffscreen) {
              err('pthread_create: cannot transfer canvas with ID "' + name + '" to thread, since the current thread does not have control over it!');
              error = {{{ cDefine('EPERM') }}}; // Operation not permitted, some other thread is accessing the canvas.
              break;
            }
            if (canvas.transferControlToOffscreen) {
  #if GL_DEBUG
              err('pthread_create: canvas.transferControlToOffscreen(), transferring canvas by name "' + name + '" (DOM id="' + canvas.id + '") from main thread to pthread');
  #endif
              // Create a shared information block in heap so that we can control
              // the canvas size from any thread.
              if (!canvas.canvasSharedPtr) {
                canvas.canvasSharedPtr = _malloc(12);
                {{{ makeSetValue('canvas.canvasSharedPtr', 0, 'canvas.width', 'i32') }}};
                {{{ makeSetValue('canvas.canvasSharedPtr', 4, 'canvas.height', 'i32') }}};
                {{{ makeSetValue('canvas.canvasSharedPtr', 8, 0, 'i32') }}}; // pthread ptr to the thread that owns this canvas, filled in below.
              }
              offscreenCanvasInfo = {
                offscreenCanvas: canvas.transferControlToOffscreen(),
                canvasSharedPtr: canvas.canvasSharedPtr,
                id: canvas.id
              }
              // After calling canvas.transferControlToOffscreen(), it is no
              // longer possible to access certain operations on the canvas, such
              // as resizing it or obtaining GL contexts via it.
              // Use this field to remember that we have permanently converted
              // this Canvas to be controlled via an OffscreenCanvas (there is no
              // way to undo this in the spec)
              canvas.controlTransferredOffscreen = true;
            } else {
              err('pthread_create: cannot transfer control of canvas "' + name + '" to pthread, because current browser does not support OffscreenCanvas!');
              // If building with OFFSCREEN_FRAMEBUFFER=1 mode, we don't need to
              // be able to transfer control to offscreen, but WebGL can be
              // proxied from worker to main thread.
  #if !OFFSCREEN_FRAMEBUFFER
              err('pthread_create: Build with -s OFFSCREEN_FRAMEBUFFER=1 to enable fallback proxying of GL commands from pthread to main thread.');
              return {{{ cDefine('ENOSYS') }}}; // Function not implemented, browser doesn't have support for this.
  #endif
            }
          }
          if (offscreenCanvasInfo) {
            transferList.push(offscreenCanvasInfo.offscreenCanvas);
            offscreenCanvases[offscreenCanvasInfo.id] = offscreenCanvasInfo;
          }
        } catch(e) {
          err('pthread_create: failed to transfer control of canvas "' + name + '" to OffscreenCanvas! Error: ' + e);
          return {{{ cDefine('EINVAL') }}}; // Hitting this might indicate an implementation bug or some other internal error
        }
      }
  #endif
  
      // Synchronously proxy the thread creation to main thread if possible. If we
      // need to transfer ownership of objects, then proxy asynchronously via
      // postMessage.
      if (ENVIRONMENT_IS_PTHREAD && (transferList.length === 0 || error)) {
        return _emscripten_sync_run_in_main_thread_4({{{ cDefine('EM_PROXIED_PTHREAD_CREATE') }}}, pthread_ptr, attr, start_routine, arg);
      }
  
      // If on the main thread, and accessing Canvas/OffscreenCanvas failed, abort
      // with the detected error.
      if (error) return error;
  
  #if OFFSCREENCANVAS_SUPPORT
      // Register for each of the transferred canvases that the new thread now
      // owns the OffscreenCanvas.
      for (var i in offscreenCanvases) {
        // pthread ptr to the thread that owns this canvas.
        {{{ makeSetValue('offscreenCanvases[i].canvasSharedPtr', 8, 'pthread_ptr', 'i32') }}};
      }
  #endif
  
      var threadParams = {
        startRoutine: start_routine,
        pthread_ptr: pthread_ptr,
        arg: arg,
  #if OFFSCREENCANVAS_SUPPORT
        moduleCanvasId: moduleCanvasId,
        offscreenCanvases: offscreenCanvases,
  #endif
        transferList: transferList
      };
  
      if (ENVIRONMENT_IS_PTHREAD) {
        // The prepopulated pool of web workers that can host pthreads is stored
        // in the main JS thread. Therefore if a pthread is attempting to spawn a
        // new thread, the thread creation must be deferred to the main JS thread.
        threadParams.cmd = 'spawnThread';
        postMessage(threadParams, transferList);
        // When we defer thread creation this way, we have no way to detect thread
        // creation synchronously today, so we have to assume success and return 0.
        return 0;
      }
  
      // We are the main thread, so we have the pthread warmup pool in this
      // thread and can fire off JS thread creation directly ourselves.
      return spawnThread(threadParams);
    },
  
  #if MINIMAL_RUNTIME
    emscripten_check_blocking_allowed__deps: ['$warnOnce'],
  #endif
    emscripten_check_blocking_allowed: function() {
  #if ASSERTIONS || IN_TEST_HARNESS || !MINIMAL_RUNTIME || !ALLOW_BLOCKING_ON_MAIN_THREAD
  #if ENVIRONMENT_MAY_BE_NODE
      if (ENVIRONMENT_IS_NODE) return;
  #endif
  
      if (ENVIRONMENT_IS_WORKER) return; // Blocking in a worker/pthread is fine.
  
      warnOnce('Blocking on the main thread is very dangerous, see https://emscripten.org/docs/porting/pthreads.html#blocking-on-the-main-browser-thread');
  #if !ALLOW_BLOCKING_ON_MAIN_THREAD
      abort('Blocking on the main thread is not allowed by default. See https://emscripten.org/docs/porting/pthreads.html#blocking-on-the-main-browser-thread');
  #endif
  
  #endif
    },
  
    pthread_kill__deps: ['emscripten_main_browser_thread_id'],
    pthread_kill: function(thread, signal) {
      if (signal < 0 || signal >= 65/*_NSIG*/) return {{{ cDefine('EINVAL') }}};
      if (thread === _emscripten_main_browser_thread_id()) {
        if (signal == 0) return 0; // signal == 0 is a no-op.
        err('Main thread (id=0x' + thread.toString(16) + ') cannot be killed with pthread_kill!');
        return {{{ cDefine('ESRCH') }}};
      }
      if (!thread) {
        err('pthread_kill attempted on a null thread pointer!');
        return {{{ cDefine('ESRCH') }}};
      }
      var self = {{{ makeGetValue('thread', C_STRUCTS.pthread.self, 'i32') }}};
      if (self !== thread) {
        err('pthread_kill attempted on thread 0x' + thread.toString(16) + ', which does not point to a valid thread, or does not exist anymore!');
        return {{{ cDefine('ESRCH') }}};
      }
      if (signal === {{{ cDefine('SIGCANCEL') }}}) { // Used by pthread_cancel in musl
        if (!ENVIRONMENT_IS_PTHREAD) cancelThread(thread);
        else postMessage({ 'cmd': 'cancelThread', 'thread': thread });
      } else if (signal != 0) {
        if (!ENVIRONMENT_IS_PTHREAD) killThread(thread);
        else postMessage({ 'cmd': 'killThread', 'thread': thread });
      }
      return 0;
    },
  
    // Returns 0 on success, or one of the values -ETIMEDOUT, -EWOULDBLOCK or -EINVAL on error.
    _emscripten_futex_wait_non_blocking__deps: ['emscripten_main_thread_process_queued_calls'],
    _emscripten_futex_wait_non_blocking: function(addr, val, timeout) {
  #if ASSERTIONS
      // Should only be called from the main web thread where atomics.wait is not allowed.
      assert(ENVIRONMENT_IS_WEB);
  #endif
  
      // Atomics.wait is not available in the main browser thread, so simulate it via busy spinning.
      var tNow = performance.now();
      var tEnd = tNow + timeout;
  
      // Register globally which address the main thread is simulating to be
      // waiting on. When zero, the main thread is not waiting on anything, and on
      // nonzero, the contents of the address pointed by __emscripten_main_thread_futex
      // tell which address the main thread is simulating its wait on.
      // We need to be careful of recursion here: If we wait on a futex, and
      // then call _emscripten_main_thread_process_queued_calls() below, that
      // will call code that takes the proxying mutex - which can once more
      // reach this code in a nested call. To avoid interference between the
      // two (there is just a single __emscripten_main_thread_futex at a time), unmark
      // ourselves before calling the potentially-recursive call. See below for
      // how we handle the case of our futex being notified during the time in
      // between when we are not set as the value of __emscripten_main_thread_futex.
  #if ASSERTIONS
      assert(__emscripten_main_thread_futex > 0);
  #endif
      var lastAddr = Atomics.exchange(HEAP32, __emscripten_main_thread_futex >> 2, addr);
  #if ASSERTIONS
      // We must not have already been waiting.
      assert(lastAddr == 0);
  #endif
  
      while (1) {
        // Check for a timeout.
        tNow = performance.now();
        if (tNow > tEnd) {
          // We timed out, so stop marking ourselves as waiting.
          lastAddr = Atomics.exchange(HEAP32, __emscripten_main_thread_futex >> 2, 0);
  #if ASSERTIONS
          // The current value must have been our address which we set, or
          // in a race it was set to 0 which means another thread just allowed
          // us to run, but (tragically) that happened just a bit too late.
          assert(lastAddr == addr || lastAddr == 0);
  #endif
          return -{{{ cDefine('ETIMEDOUT') }}};
        }
        // We are performing a blocking loop here, so we must handle proxied
        // events from pthreads, to avoid deadlocks.
        // Note that we have to do so carefully, as we may take a lock while
        // doing so, which can recurse into this function; stop marking
        // ourselves as waiting while we do so.
        lastAddr = Atomics.exchange(HEAP32, __emscripten_main_thread_futex >> 2, 0);
  #if ASSERTIONS
        assert(lastAddr == addr || lastAddr == 0);
  #endif
        if (lastAddr == 0) {
          // We were told to stop waiting, so stop.
          break;
        }
        _emscripten_main_thread_process_queued_calls();
  
        // Check the value, as if we were starting the futex all over again.
        // This handles the following case:
        //
        //  * wait on futex A
        //  * recurse into emscripten_main_thread_process_queued_calls(),
        //    which waits on futex B. that sets the __emscripten_main_thread_futex address to
        //    futex B, and there is no longer any mention of futex A.
        //  * a worker is done with futex A. it checks __emscripten_main_thread_futex but does
        //    not see A, so it does nothing special for the main thread.
        //  * a worker is done with futex B. it flips mainThreadMutex from B
        //    to 0, ending the wait on futex B.
        //  * we return to the wait on futex A. __emscripten_main_thread_futex is 0, but that
        //    is because of futex B being done - we can't tell from
        //    __emscripten_main_thread_futex whether A is done or not. therefore, check the
        //    memory value of the futex.
        //
        // That case motivates the design here. Given that, checking the memory
        // address is also necessary for other reasons: we unset and re-set our
        // address in __emscripten_main_thread_futex around calls to
        // emscripten_main_thread_process_queued_calls(), and a worker could
        // attempt to wake us up right before/after such times.
        //
        // Note that checking the memory value of the futex is valid to do: we
        // could easily have been delayed (relative to the worker holding on
        // to futex A), which means we could be starting all of our work at the
        // later time when there is no need to block. The only "odd" thing is
        // that we may have caused side effects in that "delay" time. But the
        // only side effects we can have are to call
        // emscripten_main_thread_process_queued_calls(). That is always ok to
        // do on the main thread (it's why it is ok for us to call it in the
        // middle of this function, and elsewhere). So if we check the value
        // here and return, it's the same is if what happened on the main thread
        // was the same as calling emscripten_main_thread_process_queued_calls()
        // a few times times before calling emscripten_futex_wait().
        if (Atomics.load(HEAP32, addr >> 2) != val) {
          return -{{{ cDefine('EWOULDBLOCK') }}};
        }
  
        // Mark us as waiting once more, and continue the loop.
        lastAddr = Atomics.exchange(HEAP32, __emscripten_main_thread_futex >> 2, addr);
  #if ASSERTIONS
        assert(lastAddr == 0);
  #endif
      }
      return 0;
    },
  
    __atomic_is_lock_free: function(size, ptr) {
      return size <= 4 && (size & (size-1)) == 0 && (ptr&(size-1)) == 0;
    },
  
    __call_main__deps: ['exit', '$exitOnMainThread'],
    __call_main: function(argc, argv) {
      var returnCode = {{{ exportedAsmFunc('_main') }}}(argc, argv);
  #if EXIT_RUNTIME
      if (!keepRuntimeAlive()) {
        // exitRuntime enabled, proxied main() finished in a pthread, shut down the process.
  #if PTHREADS_DEBUG
        err('Proxied main thread 0x' + _pthread_self().toString(16) + ' finished with return code ' + returnCode + '. EXIT_RUNTIME=1 set, quitting process.');
  #endif
        exitOnMainThread(returnCode);
      }
  #else
      // EXIT_RUNTIME==0 set on command line, keeping main thread alive.
  #if PTHREADS_DEBUG
      err('Proxied main thread 0x' + _pthread_self().toString(16) + ' finished with return code ' + returnCode + '. EXIT_RUNTIME=0 set, so keeping main thread alive for asynchronous event operations.');
  #endif
  #endif
    },
  
    // This function is call by a pthread to signal that exit() was called and
    // that the entire process should exit.
    // This function is always called from a pthread, but is executed on the
    // main thread due the __proxy attribute.
    $exitOnMainThread__deps: ['exit',
  #if !MINIMAL_RUNTIME
      '$handleException',
  #endif
    ],
    $exitOnMainThread__proxy: 'async',
    $exitOnMainThread: function(returnCode) {
  #if PTHREADS_DEBUG
      err('exitOnMainThread');
  #endif
  #if MINIMAL_RUNTIME
      _exit(returnCode);
  #else
      try {
        _exit(returnCode);
      } catch (e) {
        handleException(e);
      }
  #endif
    },
  
    emscripten_proxy_to_main_thread_js__deps: ['emscripten_run_in_main_runtime_thread_js'],
    emscripten_proxy_to_main_thread_js__docs: '/** @type{function(number, (number|boolean), ...(number|boolean))} */',
    emscripten_proxy_to_main_thread_js: function(index, sync) {
      // Additional arguments are passed after those two, which are the actual
      // function arguments.
      // The serialization buffer contains the number of call params, and then
      // all the args here.
      // We also pass 'sync' to C separately, since C needs to look at it.
      var numCallArgs = arguments.length - 2;
      var outerArgs = arguments;
  #if ASSERTIONS
      if (numCallArgs > {{{ cDefine('EM_QUEUED_JS_CALL_MAX_ARGS') }}}-1) throw 'emscripten_proxy_to_main_thread_js: Too many arguments ' + numCallArgs + ' to proxied function idx=' + index + ', maximum supported is ' + ({{{ cDefine('EM_QUEUED_JS_CALL_MAX_ARGS') }}}-1) + '!';
  #endif
      // Allocate a buffer, which will be copied by the C code.
      return withStackSave(function() {
        // First passed parameter specifies the number of arguments to the function.
        // When BigInt support is enabled, we must handle types in a more complex
        // way, detecting at runtime if a value is a BigInt or not (as we have no
        // type info here). To do that, add a "prefix" before each value that
        // indicates if it is a BigInt, which effectively doubles the number of
        // values we serialize for proxying. TODO: pack this?
        var serializedNumCallArgs = numCallArgs {{{ WASM_BIGINT ? "* 2" : "" }}};
        var args = stackAlloc(serializedNumCallArgs * 8);
        var b = args >> 3;
        for (var i = 0; i < numCallArgs; i++) {
          var arg = outerArgs[2 + i];
    #if WASM_BIGINT
          if (typeof arg === 'bigint') {
            // The prefix is non-zero to indicate a bigint.
            HEAP64[b + 2*i] = BigInt(1);
            HEAP64[b + 2*i + 1] = arg;
          } else {
            // The prefix is zero to indicate a JS Number.
            HEAP64[b + 2*i] = BigInt(0);
            HEAPF64[b + 2*i + 1] = arg;
          }
    #else
          HEAPF64[b + i] = arg;
    #endif
        }
        return _emscripten_run_in_main_runtime_thread_js(index, serializedNumCallArgs, args, sync);
      });
    },
  
    emscripten_receive_on_main_thread_js_callArgs: '=[]',
  
    emscripten_receive_on_main_thread_js__deps: [
      'emscripten_proxy_to_main_thread_js',
      'emscripten_receive_on_main_thread_js_callArgs'],
    emscripten_receive_on_main_thread_js: function(index, numCallArgs, args) {
  #if WASM_BIGINT
      numCallArgs /= 2;
  #endif
      _emscripten_receive_on_main_thread_js_callArgs.length = numCallArgs;
      var b = args >> 3;
      for (var i = 0; i < numCallArgs; i++) {
  #if WASM_BIGINT
        if (HEAP64[b + 2*i]) {
          // It's a BigInt.
          _emscripten_receive_on_main_thread_js_callArgs[i] = HEAP64[b + 2*i + 1];
        } else {
          // It's a Number.
          _emscripten_receive_on_main_thread_js_callArgs[i] = HEAPF64[b + 2*i + 1];
        }
  #else
        _emscripten_receive_on_main_thread_js_callArgs[i] = HEAPF64[b + i];
  #endif
      }
      // Proxied JS library funcs are encoded as positive values, and
      // EM_ASMs as negative values (see include_asm_consts)
      var isEmAsmConst = index < 0;
      var func = !isEmAsmConst ? proxiedFunctionTable[index] : ASM_CONSTS[-index - 1];
  #if ASSERTIONS
      assert(func.length == numCallArgs, 'Call args mismatch in emscripten_receive_on_main_thread_js');
  #endif
      return func.apply(null, _emscripten_receive_on_main_thread_js_callArgs);
    },
  
    // TODO(sbc): Do we really need this to be dynamically settable from JS like this?
    // See https://github.com/emscripten-core/emscripten/issues/15101.
    _emscripten_default_pthread_stack_size: function() {
      return {{{ DEFAULT_PTHREAD_STACK_SIZE }}};
    },
  
    $establishStackSpace__internal: true,
    $establishStackSpace: function() {
      var pthread_ptr = _pthread_self();
      var stackTop = {{{ makeGetValue('pthread_ptr', C_STRUCTS.pthread.stack, 'i32') }}};
      var stackSize = {{{ makeGetValue('pthread_ptr', C_STRUCTS.pthread.stack_size, 'i32') }}};
      var stackMax = stackTop - stackSize;
  #if ASSERTIONS
      assert(stackTop != 0);
      assert(stackMax != 0);
      assert(stackTop > stackMax);
  #endif
      // Set stack limits used by `emscripten/stack.h` function.  These limits are
      // cached in wasm-side globals to make checks as fast as possible.
      _emscripten_stack_set_limits(stackTop, stackMax);
  #if STACK_OVERFLOW_CHECK >= 2
      // Set stack limits used by binaryen's `StackCheck` pass.
      // TODO(sbc): Can this be combined with the above.
      ___set_stack_limits(stackTop, stackMax);
  #endif
  
      // Call inside wasm module to set up the stack frame for this pthread in wasm module scope
      stackRestore(stackTop);
  
  #if STACK_OVERFLOW_CHECK
      // Write the stack cookie last, after we have set up the proper bounds and
      // current position of the stack.
      writeStackCookie();
  #endif
    },
  
    $invokeEntryPoint: function(ptr, arg) {
      return {{{ makeDynCall('ii', 'ptr') }}}(arg);
    },
  
    // This function is called internally to notify target thread ID that it has messages it needs to
    // process in its message queue inside the Wasm heap. As a helper, the caller must also pass the
    // ID of the main browser thread to this function, to avoid needlessly ping-ponging between JS and
    // Wasm boundaries.
    _emscripten_notify_thread_queue: function(targetThreadId, mainThreadId) {
      if (targetThreadId == mainThreadId) {
        postMessage({'cmd' : 'processQueuedMainThreadWork'});
      } else if (ENVIRONMENT_IS_PTHREAD) {
        postMessage({'targetThread': targetThreadId, 'cmd': 'processThreadQueue'});
      } else {
        var pthread = PThread.pthreads[targetThreadId];
        var worker = pthread && pthread.worker;
        if (!worker) {
  #if ASSERTIONS
          err('Cannot send message to thread with ID ' + targetThreadId + ', unknown thread ID!');
  #endif
          return /*0*/;
        }
        worker.postMessage({'cmd' : 'processThreadQueue'});
      }
      return 1;
    }
  };
  
  autoAddDeps(LibraryPThread, '$PThread');
  mergeInto(LibraryManager.library, LibraryPThread);
  