问题
I need some help with this exception, I am implementing a NPAPI plugin to be able to use local sockets from browser extensions, to do that I am using Firebreath framework.
For socket and connectivity I am using Boost asio with async calls and a thread pool of 5 worker threads. Also I have a deadline per thread to implement a transmission timeout.
My extension workflow with the plugin is as this:
- Open socket 1(this starts a async_receive and the deadline async_wait)
- Write in the socket 1
Get response 1
Open another socket 2
Write in the socket 2
Write socket 1
Close socket 1 (socket.cancel(), deadline.cancel(), socket.shutdown(), socket release).
Get response 2
- Write socket 2
- Close socket 2
As everything is cross language and async is really hard to debug but all open, write or close are called from javascript and the read from socket 1 that calls open 2, write 2, write 1 and close 1 in that order.
Maybe evrything I am telling is unrelated as the call stack when the exception is thrown does not show any of my functions and only show that it is inside a malloc that calls _heap_alloc_dbg_impl
As it is it usually fails in the 2nd or 3rd full cycle and it seems that happens between steps 5 and 7.
But, I think that it must be asio related as doing everything with a single worker thread just crashes with the exception on the first cycle.
I am open to publish more information code if you need it.
Update 1:
Update 2:
There are 10 threads are launched with:
workPtr.reset( new boost::asio::io_service::work(io_service));
for ( int i = 0; i < 10; ++i) {
m_threadGroup.create_thread( boost::bind(&boost::asio::io_service::run, &io_service) );
}
The 11th _threadstartex I don't know who launched it
On another thread (not the one that VS claims as causing the crash) there is a join_all() in process because my class is being destroyed but I think it shouldn't, so maybe this crash is due to another exception and the Firebreath process to close everything when it crashes.
回答1:
I found the errors by continuing to inspect the other threads. I found that my principal class that Firebreath was invoking was in the process of being destroyed. Inspecting a little more I found that it was totally my fault I have a class for storing the sockets information that needed to use a function in the principal class (I didn't like it but it was the only way I found to use it) so I added a shared_ptr to the principal class. So if it after destroying on of those SocketInfo objects as there were no others the ptr ref count reached 0 and the principal class was being destroyed.
What is fun is that sockets usually close normally after being used so I see no reason why this was not triggered when there were not sockets opened and only happened when 2 sockets where opened and closed in a row.
Anyway I also had a shared_from_this error with the deadline handler but that seemed unrelated.
And now it seems it is working as expected with any number of threads.
来源：https://stackoverflow.com/questions/15554053/boostexception-detailclone-implboostexception-detailerror-info-injector