segment in try_dequeue

[Juno119]

hi, I have two threads, one is producer, and the other is consumer. segment in try_dequeue

(gdb) thread apply all bt

Thread 65 (Thread 0x7fbe8dffb700 (LWP 48270)):
#0 load (__m=std::memory_order_acquire, this=0x8) at /home/mmdev/gcc7/lib/gcc/x86_64-pc-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/atomic_base.h:396
#1 get_block_index_index_for_index (localBlockIndex=, index=0, this=0x7fbf202e9208)
at demoe/xlabutil/inc/concurrentqueue.h:2938
#2 get_block_index_entry_for_index (index=0, this=0x7fbf202e9208) at demoe/xlabutil/inc/concurrentqueue.h:2927
#3 dequeue<std::pair<std::basic_string, std::basic_string > > (element=..., this=0x7fbf202e9208)
at demoe/xlabutil/inc/concurrentqueue.h:2550
#4 dequeue<std::pair<std::basic_string, std::basic_string > > (element=..., this=0x7fbf202e9208)
at demoe/xlabutil/inc/concurrentqueue.h:1700
#5 try_dequeue<std::pair<std::basic_string, std::basic_string > > (item=..., this=0x30d51c0 <video_marquee_ftp_queue>)
at demoe/xlabutil/inc/concurrentqueue.h:1125
#6 FtpUploadProcess () at demoe/demoserviceimpl_pb.cpp:119
#7 0x00000000016d1b3f in std::execute_native_thread_routine (__p=0x7fbf200aa6e0) at ../../../../../gcc-7.5.0/libstdc++-v3/src/c++11/thread.cc:83
#8 0x00007fbfb47b4dc5 in start_thread () from /lib64/libpthread.so.0
#9 0x00007fbfb39bc74d in clone () from /lib64/libc.so.6

[Juno119]

hi by the way , enqueue or try_enqueue, which one is the suggestion to use with try_dequeue?

[cameron314]

Please share your code that reproduces the segfault.

You can use either enqueue or try_dequeue, it depends entirely on what you're trying to accomplish.

[cameron314]

Closing for now, feel free to reopen if you can provide an example to reproduce the crash.