ios - MusicPlayerSetPlayRateScalar causes hang/freeze in __psynch_mutexwait -


i'm using avfoundation's musicplayer play midi music in game, , periodically call musicplayersetplayratescalar set tempo. ported game objective-c swift, , since i've been getting hanging/freezing after couple dozen calls function. when freeze happens , pause execution, main thread sitting in following state:

* thread #1: libsystem_kernel.dylib`__psynch_mutexwait + 8, queue = 'com.apple.main-thread', stop reason = signal sigstop * frame #0: libsystem_kernel.dylib`__psynch_mutexwait + 8 frame #1: libsystem_pthread.dylib`_pthread_mutex_lock_wait + 96 frame #2: audiotoolbox`camutex::lock() + 52 frame #3: audiotoolbox`sequenceplayer::settemposcalefactor(double) + 36 frame #4: audiotoolbox`musicplayersetplayratescalar + 136

cpu usage jumps 100% when happens, , memory usage starts growing steadily. don't have other threads of own running. other thread activity varies, here's example (top level of other threads' stack traces):

thread #5: libsystem_kernel.dylib`kevent_qos + 8, queue = 'com.apple.libdispatch-manager' thread #6: libsystem_kernel.dylib`__semwait_signal + 8, name = 'gputools.smt_poll.0x126fe8680' thread #10: libsystem_kernel.dylib`mach_msg_trap + 8, name = 'com.apple.coreaudio.aqclient' thread #11: libsystem_kernel.dylib`semaphore_wait_trap + 8, name = 'audiostreamerimpl::sioworkerprocess' thread #12: libc++abi.dylib`__cxa_decrement_exception_refcount + 32, name = 'auremoteio::iothread' thread #13: libsystem_kernel.dylib`mach_msg_trap + 8, name = 'auremoteio::iothread'

i'd have guessed kind of deadlock given mutexes , semaphores, cpu , memory usage patterns seem indicate otherwise. how can debug further?

(incidentally, debugger crashes when bt all in situation, doubt that's related.)

something apple folks said in wwdc 2015 core audio video makes me think there's lot of c++ voodoo going on behind scenes in areas this, , swift therefore can't interface unless take precautions (and didn't understand are). in situation, if don't need backwards compatibility far back, might want try using new avaudiosequencer instead. i've found easy , reliable.


Comments

Post a Comment

Popular posts from this blog

resizing Telegram inline keyboard -

telegram's inline keyboard great feature lots of different use cases. inline buttons added list of items this: inline_keyboard = [[inlinekeyboardbutton(text="button", callback_data="button"), inlinekeyboardbutton(text="reset",callback_data="reset")]] inline_keyboard_markup = inlinekeyboardmarkup(inline_keyboard) update.message.reply_text("hi", reply_markup=inline_keyboard_markup) the above code adds 2 buttons each half width of chat screen. i know the normal keyboard button there resize_keyboard parameter somehow can used. my question is there way resize inline buttons ? example make full width or quarter width. unfortunately, can't now. :( you can suggest @botsupport , might add feature next version.
Read more

command line - How can a Python program background itself? -

consider following python command-line program. doesn't work because incomplete, think illustrates problem: #!/usr/bin/python3 import multiprocessing pool = multiprocessing.pool() task in expensive_iterator_with_user_interaction(): pool.call_async(expensive_computation, (task,)) pool.close() print("dear user, may press ctrl-z , bg script.") pool.join() thus, problem scripts needs user input while it's launching expensive parallel processes. there moment when user interaction not needed anymore. then, ask user background process shell actions. however, can achieved program itself? (side note: core of problem entanglement of user input firing “expensive computations”. therefore, cannot separate both in 2 scripts, , letting 1 spawning other daemon.) the command screen may you. use screen -l create new session , run application. after inputting data, can press " ctrl-a " , press " d " on keyboard detach session. now
Read more

php - "cURL error 28: Resolving timed out" on Wordpress on Azure App Service on Linux -

Image
my wordpress installation on azure app service on linux using custom docker container has slow response times. pages take around 20-40 seconds load. i have troubleshooting plugin installed indicates problem "curl error 28: resolving timed out after n milliseconds" when making requests following urls https://api.wordpress.org/core/version-check/1.7/ http://api.wordpress.org/core/version-check/1.7/ https://api.wordpress.org/plugins/update-check/1.1/ http://api.wordpress.org/plugins/update-check/1.1/ https://api.wordpress.org/themes/update-check/1.1/ http://api.wordpress.org/themes/update-check/1.1/ curl works fine on scm-site command line. example works ok. curl -x post http://api.wordpress.org/core/version-check/1.7/ edit if ssh container , run php code, works fine. <?php $url = 'http://api.wordpress.org/core/version-check/1.7/'; $fields = array( 'version' => urlencode('4.8.1'), 'php' => urlencode(
Read more