> 1. From an async worker thread if the binding function that reads a
> tag asynchronously is used.
> Now since any JS code needs to run in the main thread, here is what I do:
> - In the worker thread, I lock a mutex, then use uv_async_send to
> notify the main event loop. Then the worker
> thread tries to lock the mutex again and is blocked. The
> async watcher triggers the JS function from (1) in the main thread,
> then unlocks the mutex so that the worker
> thread can continue. This works perfectly.
I don't think it is safe to acquire a mutex with one thread and then
have it released by another. (with semaphores this is okay btw.)
But you could use pattern like this (pseudocode alert):
function ReadTagImpl(input) {
...
}
static result;
function ReadTagWork(work_item) {
result = ReadTagImpl(work_item.input);
AcquireMutex();
uv_async_send()
}
function ReadTagAsync(args) {
work_item = ...
uv_queue_work(ReadTagWork, work_item)
}
function ReadTagSync(args) {
return ReadTagImpl(args);
}
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