115 lines
5.6 KiB
115 lines
5.6 KiB
// Pthread Web Worker startup routine:
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// This is the entry point file that is loaded first by each Web Worker
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// that executes pthreads on the Emscripten application.
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// Thread-local:
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var threadInfoStruct = 0; // Info area for this thread in Emscripten HEAP (shared). If zero, this worker is not currently hosting an executing pthread.
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var selfThreadId = 0; // The ID of this thread. 0 if not hosting a pthread.
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var parentThreadId = 0; // The ID of the parent pthread that launched this thread.
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var tempDoublePtr = 0; // A temporary memory area for global float and double marshalling operations.
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// Thread-local: Each thread has its own allocated stack space.
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var STACK_BASE = 0;
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var STACKTOP = 0;
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var STACK_MAX = 0;
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// These are system-wide memory area parameters that are set at main runtime startup in main thread, and stay constant throughout the application.
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var buffer; // All pthreads share the same Emscripten HEAP as SharedArrayBuffer with the main execution thread.
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var DYNAMICTOP_PTR = 0;
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var TOTAL_MEMORY = 0;
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var STATICTOP = 0;
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var staticSealed = true; // When threads are being initialized, the static memory area has been already sealed a long time ago.
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var DYNAMIC_BASE = 0;
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var ENVIRONMENT_IS_PTHREAD = true;
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// 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
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// Therefore implement custom logging facility for threads running in a worker, which queue the messages to main thread to print.
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var Module = {};
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function threadPrint() {
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var text = Array.prototype.slice.call(arguments).join(' ');
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console.log(text);
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}
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function threadPrintErr() {
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var text = Array.prototype.slice.call(arguments).join(' ');
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console.error(text);
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}
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function threadAlert() {
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var text = Array.prototype.slice.call(arguments).join(' ');
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postMessage({cmd: 'alert', text: text, threadId: selfThreadId});
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}
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Module['print'] = threadPrint;
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Module['printErr'] = threadPrintErr;
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this.alert = threadAlert;
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this.onmessage = function(e) {
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if (e.data.cmd === 'load') { // Preload command that is called once per worker to parse and load the Emscripten code.
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// Initialize the thread-local field(s):
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tempDoublePtr = e.data.tempDoublePtr;
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// Initialize the global "process"-wide fields:
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buffer = e.data.buffer;
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Module['TOTAL_MEMORY'] = TOTAL_MEMORY = e.data.TOTAL_MEMORY;
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STATICTOP = e.data.STATICTOP;
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DYNAMIC_BASE = e.data.DYNAMIC_BASE;
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DYNAMICTOP_PTR = e.data.DYNAMICTOP_PTR;
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PthreadWorkerInit = e.data.PthreadWorkerInit;
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importScripts(e.data.url);
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if (typeof FS !== 'undefined') FS.createStandardStreams();
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postMessage({ cmd: 'loaded' });
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} else if (e.data.cmd === 'objectTransfer') {
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PThread.receiveObjectTransfer(e.data);
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} else if (e.data.cmd === 'run') { // This worker was idle, and now should start executing its pthread entry point.
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threadInfoStruct = e.data.threadInfoStruct;
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__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.
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assert(threadInfoStruct);
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selfThreadId = e.data.selfThreadId;
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parentThreadId = e.data.parentThreadId;
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assert(selfThreadId);
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assert(parentThreadId);
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// TODO: Emscripten runtime has these variables twice(!), once outside the asm.js module, and a second time inside the asm.js module.
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// Review why that is? Can those get out of sync?
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STACK_BASE = STACKTOP = e.data.stackBase;
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STACK_MAX = STACK_BASE + e.data.stackSize;
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assert(STACK_BASE != 0);
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assert(STACK_MAX > STACK_BASE);
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Runtime.establishStackSpace(e.data.stackBase, e.data.stackBase + e.data.stackSize);
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var result = 0;
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PThread.receiveObjectTransfer(e.data);
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PThread.setThreadStatus(_pthread_self(), 1/*EM_THREAD_STATUS_RUNNING*/);
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try {
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// HACK: Some code in the wild has instead signatures of form 'void *ThreadMain()', which seems to be ok in native code.
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// To emulate supporting both in test suites, use the following form. This is brittle!
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if (typeof asm['dynCall_ii'] !== 'undefined') {
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result = asm.dynCall_ii(e.data.start_routine, e.data.arg); // pthread entry points are always of signature 'void *ThreadMain(void *arg)'
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} else {
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result = asm.dynCall_i(e.data.start_routine); // as a hack, try signature 'i' as fallback.
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}
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} catch(e) {
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if (e === 'Canceled!') {
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PThread.threadCancel();
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return;
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} else {
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Atomics.store(HEAPU32, (threadInfoStruct + 4 /*{{{ C_STRUCTS.pthread.threadExitCode }}}*/ ) >> 2, -2 /*A custom entry specific to Emscripten denoting that the thread crashed.*/);
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Atomics.store(HEAPU32, (threadInfoStruct + 0 /*{{{ C_STRUCTS.pthread.threadStatus }}}*/ ) >> 2, 1); // Mark the thread as no longer running.
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_emscripten_futex_wake(threadInfoStruct + 0 /*{{{ C_STRUCTS.pthread.threadStatus }}}*/, 0x7FFFFFFF/*INT_MAX*/); // wake all threads
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throw e;
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}
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}
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// The thread might have finished without calling pthread_exit(). If so, then perform the exit operation ourselves.
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// (This is a no-op if explicit pthread_exit() had been called prior.)
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if (!Module['noExitRuntime']) PThread.threadExit(result);
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else console.log('pthread noExitRuntime: not quitting.');
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} else if (e.data.cmd === 'cancel') { // Main thread is asking for a pthread_cancel() on this thread.
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if (threadInfoStruct && PThread.thisThreadCancelState == 0/*PTHREAD_CANCEL_ENABLE*/) {
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PThread.threadCancel();
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}
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} else {
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Module['printErr']('pthread-main.js received unknown command ' + e.data.cmd);
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}
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}
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