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authorpooka <pooka@NetBSD.org>2014-12-16 20:05:54 +0000
committerpooka <pooka@NetBSD.org>2014-12-16 20:05:54 +0000
commitbc59b09d1a686ba7cf74307c2ff244ba6a094cf6 (patch)
treefd43f80c26325ccf4590175694c5191500a08b39 /sys/dev
parentb3ead97fcc4f83d232e3b3e669a4728a8d2ebc62 (diff)
Allow for arbitrary MI scheduler implementations.
A concrete result is enabling unpatched libpthread to run on the rumprun stacks (e.g. Xen and bare metal) with a non-NetBSD scheduler. Those schedulers hook into the existing _lwp_frobnitz() NetBSD syscall interfaces (well, "syscall" interfaces in that scenario ;) More specifically about the change itself: 1) instead of calling _lwp_makecontext() followed by _lwp_create() and passing the entry point in ucontext_t (MD) through the calls, roll the calls into pthread__makelwp() and allow alternate implementations for that MI interface. 2) allow compile-time overriding of __lwp_gettcb_fast() or __lwp_getprivate_fast, which are inline and leak MD scheduler/thread details into libpthread Additionally, two small nits: I) define LIB=pthread before including mk.conf so that it's possible to test for LIB==pthread in mk.conf II) make it possible to leave out pthread_cancelstub.c. This is required by the current implementation of rumprun-posix (i.e. rumprun on POSIX hosts) due to symbol collisions. It needs to be fixed properly some day, but for now allows an almost-correct libpthread to run. I am sure @justin will be happy to explain the details ;) no change to NetBSD tested: anita+atf
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