bwlp/qemu.git/docs/lockcnt.txt, branch spice_video_codecs

docs: create config/, devel/ and spin/ subdirectories

2017-06-07T16:22:03+00:00

Developer documentation should be its own manual. As a start, move all developer-oriented files to a separate directory. Also move non-text files to their own directories: docs/config/ for QEMU -readconfig input, and docs/spin/ for formal models to be used with the SPIN model checker. Reviewed-by: Daniel P. Berrange Signed-off-by: Paolo Bonzini

qemu-thread: optimize QemuLockCnt with futexes on Linux

2017-01-16T13:25:18+00:00

This is complex, but I think it is reasonably documented in the source. Signed-off-by: Paolo Bonzini Reviewed-by: Fam Zheng Reviewed-by: Stefan Hajnoczi Message-id: 20170112180800.21085-5-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi

qemu-thread: introduce QemuLockCnt

2017-01-16T13:25:17+00:00

A QemuLockCnt comprises a counter and a mutex, with primitives to increment and decrement the counter, and to take and release the mutex. It can be used to do lock-free visits to a data structure whenever mutexes would be too heavy-weight and the critical section is too long for RCU. This could be implemented simply by protecting the counter with the mutex, but QemuLockCnt is harder to misuse and more efficient. Signed-off-by: Paolo Bonzini Reviewed-by: Fam Zheng Reviewed-by: Stefan Hajnoczi Message-id: 20170112180800.21085-3-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi