i've been away from julia for a while so am not up-to-date on changes, and am looking at an odd problem.
i have some code, which is messier and more complex than i would like, which is called to print a graph of values. the print code uses tasks. in 0.3 this works, but in 0.4 the program sits, using no CPU. if i dump the stack (using gstack PID) i see: Thread 4 (Thread 0x7efe3b6bb700 (LWP 1709)): #0 0x00007f0042e7e05f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007efe3bf62b5b in blas_thread_server () from /home/andrew/pkg/julia-0.4/usr/bin/../lib/libopenblas64_.so #2 0x00007f0042e7a0a4 in start_thread () from /lib64/libpthread.so.0 #3 0x00007f004231604d in clone () from /lib64/libc.so.6 Thread 3 (Thread 0x7efe3aeba700 (LWP 1710)): #0 0x00007f0042e7e05f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007efe3bf62b5b in blas_thread_server () from /home/andrew/pkg/julia-0.4/usr/bin/../lib/libopenblas64_.so #2 0x00007f0042e7a0a4 in start_thread () from /lib64/libpthread.so.0 #3 0x00007f004231604d in clone () from /lib64/libc.so.6 Thread 2 (Thread 0x7efe3a6b9700 (LWP 1711)): #0 0x00007f0042e7e05f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007efe3bf62b5b in blas_thread_server () from /home/andrew/pkg/julia-0.4/usr/bin/../lib/libopenblas64_.so #2 0x00007f0042e7a0a4 in start_thread () from /lib64/libpthread.so.0 #3 0x00007f004231604d in clone () from /lib64/libc.so.6 Thread 1 (Thread 0x7f0044710740 (LWP 1708)): #0 0x00007f0042e8120d in pause () from /lib64/libpthread.so.0 #1 0x00007f0040a190fe in julia_wait_17546 () at task.jl:364 #2 0x00007f0040a18ea1 in julia_wait_17544 () at task.jl:286 #3 0x00007f0040a40ffc in julia_lock_18599 () at lock.jl:23 #4 0x00007efe3ecdbeb7 in ?? () #5 0x00007ffd3e6ad2c0 in ?? () #6 0x0000000000000000 in ?? () which looks suspiciously like some kind of deadlock. but i am not using threads, myself. just tasks. hence the question. any pointers appreciated. thanks, andrew
