)]}'
{
  "commit": "2cadade3af68b8a7b0717ddd8cb8a2383a3cf59e",
  "tree": "d95322f534a9bd8c7c9f8c6b5cb47bdfd9251571",
  "parents": [
    "39a0a85c7cf9cac1b32f01f4ac2697454531ecae"
  ],
  "author": {
    "name": "Thomas Lively",
    "email": "tlively@google.com",
    "time": "Sat Aug 01 02:20:32 2026"
  },
  "committer": {
    "name": "Thomas Lively",
    "email": "tlively@google.com",
    "time": "Sat Aug 01 02:20:32 2026"
  },
  "message": "SHARED_WASMGC mechanism for sending data to new threads\n\nThe experimental SHARED_WASMGC setting already allows for sharing data between threads in the form of a single global value initialized once on the main thread and then imported whenever the module is instantiated on a new worker. This is technically sufficient to bootstrap arbitrary shared state, including a user space message-passing primitives, as long as threads can be initialized with different thread IDs, but this is not very convenient.\n\nAdd another mechanism gated behind SHARED_WASMGC that allows sending specific shared values to newly spawned threads without a complicated user space TID-keyed parallel mailbox system. The new system depends on the module exporting two new globals, _gc_spawn_arg for outgoing values and _gc_thread_state for received values. When a thread calls pthread_create, its _gc_spawn_arg value is read and transferred via postMessage to the Worker where the new thread is created, where it is assigned to _gc_thread_state before pthread initialization.\n\nMake both the existing globally shared state mechanism and the new thread state mechanism optional so users can use either or both as they wish.\n",
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