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Richard Purdie
7df31ff368
There is a compelling usecase for tasks being able to notify runqueue that their "unihash" has changed. When this is recieved, the hashes of all subsequent tasks should be recomputed and their new hashes checked against existing setscene validity. Any newly available setscene tasks should then be executed. Making this work effectively needs several pieces. An event is added which the cooker listen for. If a new hash becomes available it can send an event to notify of this. When such an event is seen, hash recomputations are made. A setscene task can't be run until all the tasks it "covers" are stopped. The notion of "holdoff" tasks is therefore added, these are removed from the buildable list with the assumption that some setscene task will run and cover them. The workers need to be notified when taskhashes change to update their own internal siggen data stores. A new worker command is added to do this which will affect all newly spawned worker processes from that worker. An example workflow which tests this code is: Configuration: BB_SIGNATURE_HANDLER = "OEEquivHash" SSTATE_HASHEQUIV_SERVER = "http://localhost:8686" $ bitbake-hashserv & $ bitbake automake-native $ bitbake autoconf-native automake-native -c clean $ bitbake m4-native -c install -f $ bitbake automake-native with the test being whether automake-native is installed from sstate. (Bitbake rev: 1f630fdf0260db08541d3ca9f25f852931c19905) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.