Running multithreaded Emscripten from D8?

[Keith Teo]

Hi, 

I am trying to benchmark the effects of modifications to various parts of the WASM toolchain. But when running multithreaded emscripten output in d8 I get the error:

Aborted(Assertion failed: Pthreads do not work in this environment yet (need Web Workers, or an alternative to them))
test.js:731: RuntimeError: Aborted(Assertion failed: Pthreads do not work in this environment yet (need Web Workers, or an alternative to them))
  throw e;

The error comes from this line:

assert(
  ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER || ENVIRONMENT_IS_NODE, 'Pthreads do not work in this environment yet (need Web Workers, or an alternative to them)');

Anyone know how to get around this? d8 is capable of running web workers, so there's no technical limitation on it. 

This is how I compiled my cpp code

em++ -sENVIRONMENT=shell,worker -s ASSERTIONS=2 -s PTHREAD_POOL_SIZE=4 -s WASM=1 -pthread test.cpp -o test.js

[guest271314]

I think Worker in d8 is implemented different from Worker in a browser.

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[Sam Clegg]

If you want threads you will need to either run under Node or in the browser.  Emscripten only has support for Node workers and Web workers. 

If you want a version of node that has the very latest version of v8 you can use the node-canary releases: https://nodejs.org/download/v8-canary/

cheers,

sam

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