Can I use wamr in multithreaded environment?

[NinevskiyK]

Hi! I'm trying to run multiple modules in parallel, using C++ threads. What I'm doing is that:

• Initializing wasm runtime in parent proccess (using wasm_runtime_full_init)
• Creating many threads, in each one create and run new module (wasm_runtime_instantiate, wasm_runtime_create_exec_env, wasm_runtime_call_wasm)

The only wrong thing is exception with a message: "thread signal env not inited". If I comment this check out, everything is working. So what I'm doing wrong, why this exception is raised - there's no any documentation on that.

Also, I've read this issue, it is proposed to use os_thread_create to run multiple threads, just what I need. But unfortunately, I haven't found any documentation/examples on this, maybe someone has? :)

[wenyongh]

Hi, for "thread signal env not inited", maybe you can try calling wasm_runtime_init_thread_env in the beginning of the new thread's callback, and wasm_runtime_destroy_thread_env in the end of the callback. Refer to:
https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/core/iwasm/include/wasm_export.h#L719-L738

[NinevskiyK]

Thank you, that works fine!