(gdb) where
#0 0x0000000800acf98c in sched_yield () from /lib/libc.so.7
#1 0x00000000004024d5 in Logbuffer::loop (this=0x7fffffffe970) at logbuffer.cpp:228
#2 0x0000000000402d44 in main () at logbuffer.cpp:407