> -----Original Message----- > From: Paolo Bonzini [mailto:paolo.bonz...@gmail.com] On Behalf Of Paolo > Bonzini > Sent: 2015年3月6日 17:45 > To: Halsey Pian; qemu-devel@nongnu.org > Subject: Re: [Bug] qemu_coroutine_enter abort and report error "Co-routine > re-entered recursively" > > > > On 06/03/2015 08:03, Halsey Pian wrote: > > I have two threads to write two seperate qcow2 files, but after a > > while, the writing would be aborted in qemu_coroutine_enter, and > > report error “"Co-routine re-entered recursively” . > > > > Qemu should be thread safe, right? It seems that there are some > > variables is not thread safe? Could you have a chance to look it? Thanks! > > QEMU is thread safe but you need to add explicit locking or use separate > event loops in each thread. If you want to write from > separate thread, you need to do one of the following: > > 1) use one AioContext per file, and add an AioContext-based event loop to > each thread (see backends/iothread.c); > > 2) use one AioContext per file, add it (as a GSource) to a GMainContext and > use a GMainLoop-based event loop to each thread; > > 3) use aio_context_acquire and aio_context_release around each blk_* or > bdrv_* call. > > Paolo
Hi Paolo, Thanks for your immediate reply. I checked relevant source code, and I'm trying changing AioContext. Would keep changing based on your comments. Thank you! [Halsey]
