diff options
| author | pooka <pooka@NetBSD.org> | 2014-12-16 20:05:54 +0000 |
|---|---|---|
| committer | pooka <pooka@NetBSD.org> | 2014-12-16 20:05:54 +0000 |
| commit | bc59b09d1a686ba7cf74307c2ff244ba6a094cf6 (patch) | |
| tree | fd43f80c26325ccf4590175694c5191500a08b39 /sys/dev | |
| parent | b3ead97fcc4f83d232e3b3e669a4728a8d2ebc62 (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
Diffstat (limited to 'sys/dev')
0 files changed, 0 insertions, 0 deletions
