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8075e99bb6
See <https://mazzo.li/posts/stopping-linux-threads.html> for tradeoffs regarding how to terminate threads gracefully. The goal of this work was for valgrind to work correctly, which in turn was to investigate #141. It looks like I have succeeded: ==2715080== Warning: unimplemented fcntl command: 1036 ==2715080== 20,052 bytes in 5,013 blocks are definitely lost in loss record 133 of 135 ==2715080== at 0x483F013: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==2715080== by 0x3B708E: allocate (new_allocator.h:121) ==2715080== by 0x3B708E: allocate (allocator.h:173) ==2715080== by 0x3B708E: allocate (alloc_traits.h:460) ==2715080== by 0x3B708E: _M_allocate (stl_vector.h:346) ==2715080== by 0x3B708E: std::vector<Crc, std::allocator<Crc> >::_M_default_append(unsigned long) (vector.tcc:635) ==2715080== by 0x42BF1C: resize (stl_vector.h:940) ==2715080== by 0x42BF1C: ShardDBImpl::_fileSpans(rocksdb::ReadOptions&, FileSpansReq const&, FileSpansResp&) (shard/ShardDB.cpp:921) ==2715080== by 0x420867: ShardDBImpl::read(ShardReqContainer const&, ShardRespContainer&) (shard/ShardDB.cpp:1034) ==2715080== by 0x3CB3EE: ShardServer::_handleRequest(int, sockaddr_in*, char*, unsigned long) (shard/Shard.cpp:347) ==2715080== by 0x3C8A39: ShardServer::step() (shard/Shard.cpp:405) ==2715080== by 0x40B1E8: run (core/Loop.cpp:67) ==2715080== by 0x40B1E8: startLoop(void*) (core/Loop.cpp:37) ==2715080== by 0x4BEA258: start_thread (in /usr/lib/libpthread-2.33.so) ==2715080== by 0x4D005E2: clone (in /usr/lib/libc-2.33.so) ==2715080== ==2715080== ==2715080== Exit program on first error (--exit-on-first-error=yes)