Thread model for Embedding WAMR in a host

[schorg]

I read in the documentation for the thread model of the wasm-c-api that a wasm_engine_t instance may only be created once per process, while every wasm_store_t and it's objects may only be accessed in a single thread.

Question: Is this the general thread model for embedding WAMR ?

Background: I have a multi-threaded application and want to initialize the runtime once in the process

  /* initialize the wasm runtime by default configurations */
  wasm_runtime_init();

  /* add line below if we want to export native functions to WASM app */
  wasm_runtime_register_natives(...);

And then load and run modules from different threads

  /* read WASM file into a memory buffer */
  buffer = read_wasm_binary_to_buffer(…, &size);

  /* parse the WASM file from buffer and create a WASM module */
  module = wasm_runtime_load(buffer, size, error_buf, sizeof(error_buf));

  /* create an instance of the WASM module (WASM linear memory is ready) */
  module_inst = wasm_runtime_instantiate(module, stack_size, heap_size,
                                         error_buf, sizeof(error_buf));

Are the functions to load and instantiate the modules thread-safe?

[lum1n0us]

It is a pretty simple thread model for embedding hosts. It requires a host to create and maintain a thread pool and create an instance for every worker in the pool. Only need to load .wasm once.

If tends to follow the "wasm-c-api" model, it is better to only use APIs in wasm-c-api.h

[schorg]

Thanks for the quick answer and your help.