[Bug 787208] New: ipcpipeline: doesn't work on macOS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787208

            Bug ID: 787208
           Summary: ipcpipeline: doesn't work on macOS
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: phil at base-art.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: gkiagia at tolabaki.gr
     GNOME version: ---

Trying the ipcpipeline1 example, the state-change on the master pipeline never
completes. Looks like gst_ipc_pipeline_comm_reply_request() is never called so
the req cond isn't signaled.

(lldb) bt all
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007fff91209bf2 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff912f5833 libsystem_pthread.dylib`_pthread_cond_wait +
769
    frame #2: 0x00000001003ad8c6 libglib-2.0.0.dylib`g_cond_wait_until + 129
    frame #3: 0x00000001018a7657
libgstipcpipeline.so`comm_request_wait(comm=0x000000010104d108,
req=0x00000001007a4a10, ack_type=ACK_TYPE_TIMED) at gstipcpipelinecomm.c:106
    frame #4: 0x00000001018a3fdf
libgstipcpipeline.so`gst_ipc_pipeline_comm_sync_fd(comm=0x000000010104d108,
id=1, query=0x0000000000000000, ret=0x00007fff5fbfc904,
ack_type=ACK_TYPE_TIMED, type=COMM_REQUEST_TYPE_STATE_CHANGE) at
gstipcpipelinecomm.c:210
    frame #5: 0x00000001018a5241
libgstipcpipeline.so`gst_ipc_pipeline_comm_write_state_change_to_fd(comm=0x000000010104d108,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstipcpipelinecomm.c:1208
    frame #6: 0x00000001018ac9dd
libgstipcpipeline.so`gst_ipc_pipeline_sink_change_state(element=0x000000010104d000,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstipcpipelinesink.c:654
    frame #7: 0x0000000100179d03
libgstreamer-1.0.0.dylib`gst_element_change_state(element=0x000000010104d000,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstelement.c:2815
    frame #8: 0x000000010017c8de
libgstreamer-1.0.0.dylib`gst_element_set_state_func(element=0x000000010104d000,
state=GST_STATE_READY) at gstelement.c:2769
    frame #9: 0x00000001001792f2
libgstreamer-1.0.0.dylib`gst_element_set_state(element=0x000000010104d000,
state=GST_STATE_READY) at gstelement.c:2670
    frame #10: 0x00000001001429cd
libgstreamer-1.0.0.dylib`gst_bin_element_set_state(bin=0x0000000101046140,
element=0x000000010104d000, base_time=0, start_time=0, current=GST_STATE_NULL,
next=GST_STATE_READY) at gstbin.c:2596
    frame #11: 0x000000010013c2a2
libgstreamer-1.0.0.dylib`gst_bin_change_state_func(element=0x0000000101046140,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstbin.c:2938
    frame #12: 0x00000001001b9776
libgstreamer-1.0.0.dylib`gst_pipeline_change_state(element=0x0000000101046140,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstpipeline.c:508
    frame #13: 0x0000000100179d03
libgstreamer-1.0.0.dylib`gst_element_change_state(element=0x0000000101046140,
transition=GST_STATE_CHANGE_NULL_TO_READY) at gstelement.c:2815
    frame #14: 0x000000010017c8de
libgstreamer-1.0.0.dylib`gst_element_set_state_func(element=0x0000000101046140,
state=GST_STATE_PLAYING) at gstelement.c:2769
    frame #15: 0x00000001001792f2
libgstreamer-1.0.0.dylib`gst_element_set_state(element=0x0000000101046140,
state=GST_STATE_PLAYING) at gstelement.c:2670
    frame #16: 0x00000001000037a9 ipcpipeline1`start_source(fdin=3, fdout=3) at
ipcpipeline1.c:123
    frame #17: 0x0000000100003552 ipcpipeline1`main(argc=1,
argv=0x00007fff5fbfd6f0) at ipcpipeline1.c:185
    frame #18: 0x00007fff910db235 libdyld.dylib`start + 1

  thread #2, name = 'reader'
    frame #0: 0x00007fff91209eb6 libsystem_kernel.dylib`__select + 10
    frame #1: 0x00000001018a7af3
libgstipcpipeline.so`update_adapter(comm=0x000000010104d108) at
gstipcpipelinecomm.c:1727
    frame #2: 0x00000001018a66a0
libgstipcpipeline.so`reader_thread(data=0x000000010104d108) at
gstipcpipelinecomm.c:2157
    frame #3: 0x0000000100393b16 libglib-2.0.0.dylib`g_thread_proxy + 90
    frame #4: 0x00007fff912f493b libsystem_pthread.dylib`_pthread_body + 180
    frame #5: 0x00007fff912f4887 libsystem_pthread.dylib`_pthread_start + 286
    frame #6: 0x00007fff912f408d libsystem_pthread.dylib`thread_start + 13

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