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This stores errno, the cancelation flags, and related bits for each thread
and is allocated by ld.so or libc.a. This is an ABI break from 5.9-stable!
Make libpthread dlopen'able by moving the cancelation wrappers into libc
and doing locking and fork/errno handling via callbacks that libpthread
registers when it first initializes. 'errno' *must* be declared via
<errno.h> now!
Clean up libpthread's symbol exports like libc.
On powerpc, offset the TIB/TCB/TLS data from the register per the ELF spec.
Testing by various, particularly sthen@ and patrick@
ok kettenis@
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into libc, and move pthread_sigmask() as well (just a trivial wrapper).
This provides consistent handling of SIGTHR between single- and multi-threaded
programs and is a step in the merge of all the libpthread overloads, providing
some ASM and Makefile bits that the other wrappers will need.
ok deraadt@ millert@
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cancellation properly when a handled (but not waited for) signal occurs
ok tedu@
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support is needed before they can be usefully enabled but I don't want
to misplace this diff yet again
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particularly the "consume the signal you just sent" hang, and putting
the wait queues in userspace.
Do cancellation handling in pthread_cond_*wait(), pthread_join(),
and sem_wait().
Add __ prefix to thr{sleep,wakeup,exit,sigdivert}() syscalls; add
'abort" argument to thrsleep to close cancellation race; make
thr{sleep,wakeup} return errno values via *retval to avoid touching
userspace errno.
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thread library uses it internally for cancellation.
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using previously allocated SIGTHR to interrupt in-process syscalls
and fixing the spelling of "cancelled" along the way.
Modeled on FreeBSD's libthr
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and struct timespec * argument. sigtimedwait is just a one line
wrapper after this.
"get it in" deraadt@, tedu@, cheers by others
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finally reading the lint warnings (sigh)
ok tedu@
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signal is already pending in the calling thread or the main thread
and there's no longer a race condition where the signal could be
diverted but sigwait() would still block. There were some off-by-one
errors too.
(The checking of the main thread's pending list is just until a
pending list for the process can be added to struct process. For
now, such signals end up as pending on the main thread.)
oks tedu@ and art@
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sigprocmask(2) in threaded programs.
From Philip Guenther <guenther at sendmail.com> via PR library/5795.
okay marc@
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update for new thrwakeup that takes a count argument
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