I am porting my app to Qt 5.7
When I run it, it appears on the screen,
but there is a long pause (~10 secs.) before it is responsive.
I ran it with strace and there is a point where it makes
100K calls to the poll() function, which accounts for the long pause.
I tried running it in a debugger, but the app does not exhibit the pause in
that context.
Sounds like a threading race condition and running in the debugger changes the
timing just enough.
Gave the debugger another try. On some occasions, it would
take the long pause. (The pause is more like 5 seconds.)
If I interrupt it, this is the stack trace.
Note that it is in the call to show() which precedes
my call to exec().
Bill
#0 0x0000003b0a0df113 in poll () from /lib64/libc.so.6
#1 0x0000003b0bc449f9 in ?? () from /lib64/libglib-2.0.so.0
#2 0x0000003b0bc44e4c in g_main_context_iteration () from
/lib64/libglib-2.0.so.0
#3 0x00007ffff55b2740 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from
/nobackup/whc/qt/5.7.0-shared-debug-64Bit-RH6-NoOpenGL/qtbase/lib/libQt5Core.so.5
#4 0x00007ffff5565229 in
QCoreApplication::processEvents(QFlags<QEventLoop::ProcessEventsFlag>, int) ()
from
/nobackup/whc/qt/5.7.0-shared-debug-64Bit-RH6-NoOpenGL/qtbase/lib/libQt5Core.so.5
#5 0x000000000098c60b in MyProg::show (this=0x7fffffffb8d0) at prog.cpp:562
#6 0x0000000000986551 in MyMain (argc=@0x7fffffffc15c: 1, argv=0x7fffffffc2f8)
at prog.cpp:151
#7 0x0000000000986ad9 in main (argc=1, argv=0x7fffffffc2f8) at yoda.cpp:221
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