Fix a logic bug I re-introduced in my patch I sent to Daniel
that would cause the selected shared threading library to be
overwritten with its 32-bit version on amd64.

PR: amd64/112509

Allow DEFAULT_THREAD_LIB to be set from /etc/src.conf.

Submitted by: ru

Enable symbol versioning by default. Use WITHOUT_SYMVER to disable it.
Warning, after symbol versioning is enabled, going back is not easy
(use WITHOUT_SYMVER at your own risk).

Change the default

Enable symbol versioning by default. Use WITHOUT_SYMVER to disable it.
Warning, after symbol versioning is enabled, going back is not easy
(use WITHOUT_SYMVER at your own risk).

Change the default thread library to libthr.

There most likely still needs to be a version bump for at least the
thread libraries. If necessary, this will happen later.

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- When building world WITHOUT_LIBPTHREAD, link libthr to libpthread.
- Don't build ngctl(8) and cached(8) if threading libs aren't built.
- Fix various issues in a cached(8) makefile.

Remove alpha left-overs.

Install shared libpthread library into /lib; needed by some
/sbin programs.

Comment out -g compiler option, found by 'FreeBSD Build Options Survey'.

Convert NO_PROFILE and NO_LIB32 to new style.

The thr_new sysscall was already in libc, don't generate it.

Link libthr to libpthread on Alpha and Sparc.

Bump the shared library version number of all libraries that have not
been bumped since RELENG_5.

Reviewed by: ru
Approved by: re (not needed for commit check but in principle...)

Add a stub libthr(3) man page to document what it is and why, as well as
to point at libmap.conf(5). This will help answer questions about what
and why it is, although not in great detail.

Approved

Add a stub libthr(3) man page to document what it is and why, as well as
to point at libmap.conf(5). This will help answer questions about what
and why it is, although not in great detail.

Approved by: re (scottl)
MFC after: 1 week
MFC note: When MFC'd, don't MFC mention of work not yet MFC'd.

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Use thr_new syscall to create a new thread, obscure context operations
is no longer needed.

Add debugger event reporting support, current only TD_CREATE and TD_DEATH
events are reported.

Remove debug symbol from installed library, one can always
use compiled version in libthr directory.

Import my recent 1:1 threading working. some features improved includes:
1. fast simple type mutex.
2. __thread tls works.
3. asynchronous cancellation works ( using signal ).
4. thread synchroni

Import my recent 1:1 threading working. some features improved includes:
1. fast simple type mutex.
2. __thread tls works.
3. asynchronous cancellation works ( using signal ).
4. thread synchronization is fully based on umtx, mainly, condition
variable and other synchronization objects were rewritten by using
umtx directly. those objects can be shared between processes via
shared memory, it has to change ABI which does not happen yet.
5. default stack size is increased to 1M on 32 bits platform, 2M for
64 bits platform.
As the result, some mysql super-smack benchmarks show performance is
improved massivly.

Okayed by: jeff, mtm, rwatson, scottl

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For variables that are only checked with defined(), don't provide
any fake value.

Add rtld-elf to the include path for the rtld to pthread TLS interface.

Relink libc_r.a, libc_r.so and libc_r_p.so from libthr to libkse.
On ia64, where there's no libc_r at all, libkse is now the default
thread library by virtue of these links.

The reasons for this cha

Relink libc_r.a, libc_r.so and libc_r_p.so from libthr to libkse.
On ia64, where there's no libc_r at all, libkse is now the default
thread library by virtue of these links.

The reasons for this change are:
1. libkse is slated to become the default thread library anyway,
2. active development and maintenance is only present for libkse,
3. GNOME and KDE, both in the process of being supported on ia64,
work better with KSE; even on ia64.

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Axe AINC.

Submitted by: bde

Create compatibility links for libc_r on ia64 to prevent build-time
breakages. Note that runtime compatibility is not guaranteed. Future
changes to setjmp/longjmp in libc will break threaded applicat

Create compatibility links for libc_r on ia64 to prevent build-time
breakages. Note that runtime compatibility is not guaranteed. Future
changes to setjmp/longjmp in libc will break threaded applications
linked against libc_r.so.5 on ia64. We pull our "tier 2" card once
more...

Reviewed by: ru

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Make WARNS2 clean. The fixes mostly included:
o removed unused variables
o explicit inclusion of header files
o prototypes for externally defined functions

Approved by: re/blanket libthr

- Adjust the makefiles so we have a per architecture makefile.

- Add libthr but don't hook it up to the regular build yet. This is an
adaptation of libc_r for the thr system call interface. This is beta
quality code.