split init and errno to a separate file. No point in growing rtld 10K.

branches: 1.3.56; 1.3.62;
Merge the nathanw_sa branch.

branches: 1.2.2; 1.2.8;
add. This holds the global __isthreaded variable, to indicate that threading
is (or is not) present.

add stub thread functions. These are not (yet) used, and always return
success. They are weak-aliased, so if linked with a real pthreads library
the correct magic will happen.

Assign copyright to TNF

branches: 1.2.26; 1.2.34;
Add missing __RCSID()

branches: 1.1.2;
add. This holds the global __isthreaded variable, to indicate that threading
is (or is not) present.

branches: 1.1.2;
file pthread-indr.c was initially added on branch nathanw_sa.

Merge the nathanw_sa branch.

branches: 1.3.6;
Delint.
Remove trailing ; from uses of __weak_alias(). The macro inserts this if
needed.

branches: 1.2.2;
typo

add stub thread functions. These are not (yet) used, and always return
success. They are weak-aliased, so if linked with a real pthreads library
the correct magic will happen.

branches: 1.2.4;
Put the startup code in .text.startup

branches: 1.1.2;
split init and errno to a separate file. No point in growing rtld 10K.

revert pthread_setname_np change

Update for new __pthread_setname_np120

libc: Expose some more pthread stubs.

Additionally, provide the option for pthread.h to expose
pthread_create so that libc can provide a weak stub for it, if you
define _NETBSD_PTHREAD_CREATE_WEAK.

This allows libraries to use the functions without linking against
libpthread for applications that don't need threads. For example,
with OpenSSL's libcrypto, as long as you don't try to raise
OSSL_set_max_threads above 0, it won't ever try pthread_create.

New pthread.h macros defined:

pthread_attr_destroy __libc_thr_attr_destroy
pthread_attr_init __libc_thr_attr_init
pthread_attr_setdetachstate __libc_thr_attr_setdetachstate
pthread_detach __libc_thr_detach
pthread_join __libc_thr_join

New pthread.h macros defined if _NETBSD_PTHREAD_CREATE_WEAK is
defined first:

pthread_create __libc_thr_create

New symbols defined by libc as weak aliases for stubs that always
fail but can be overridden by libpthread:

__libc_thr_attr_destroy
__libc_thr_attr_init
__libc_thr_attr_setdetachstate
__libc_thr_detach
__libc_thr_join

Note that libc already defined __libc_thr_create.

New internal stubs, not for overriding:

__libc_thr_detach_stub
__libc_thr_join_stub

These were formerly called __libc_pthread_detach and
__libc_pthread_join, respectively, and libc has defined weak aliases
pthread_detach and pthread_join for them since 2013. I retained all
four of those symbols, but defined new ones in the __ namespace that
match the pattern for other thread stubs to avoid raising questions
about why the pattern seems to be broken. I left a comment noting
this fact too.

New pthread strong aliases to override the libc symbols:

__libc_thr_attr_destroy
__libc_thr_attr_init
__libc_thr_attr_setdetachstate
__libc_thr_detach
__libc_thr_join

Note that pthread already defined a strong __libc_thr_create alias
for the real pthread_create, so there is no need to add a new one.

PR lib/59685: libcrypto should not depend on libpthread

branches: 1.33.2;
Add weak aliases for methods used by the new jemalloc. Co-opt the mutex
catchall for now for it.

branches: 1.32.4;
lib: remove CONSTCOND comment

Since 2021-01-31, lint doesn't need it anymore for the common pattern of
'do ... while (0)'.

change libc sched_yield() stub to actually still call the syscall
instead of doing nothing when app is not linked with pthread; this matches
other systems

suggested by Mateusz Guzik in:
http://mail-index.netbsd.org/tech-kern/2020/07/19/msg026620.html

Adjust the error return value of pthread_sigmask for !libpthread usage

Instead of returning -1, return errno on error.

Catch up after the fix in libpthread by Andrew Doran in 2008
in lib/libpthread/pthread_misc.c r.1.9.

It's an open question whether this function shall be used without linked
in the POSIX thread library.

Detected by Bruno Haible (GNU) and documented in gnulib in commit
"pthread_sigmask: Avoid test failure on NetBSD 8.0. " r. 4d16a83b0c1fcb6c.

branches: 1.29.2;
Transfer all the keys that were created in the libc stub implementation
to the pthread tsd implementation when the main thread is created.
This corrects a problem where a process created keys before libpthread
was loaded (either from the libc constructor or because libpthread
was dlopened later). This fixes a problem with jemalloc which creates
keys in the constructor.

branches: 1.28.14;
Add CHECK_NOT_THREADED() in __libc_mutexattr_settype_stub()

This makes this function consistent with __libc_mutex_catchall_stub()
and others in the same group.

Approved by <christos>.

branches: 1.27.10;
mark __libc_thr_exit_stub dead here too

Provide stubs for pthread_detach/pthread_join.

Weak alias directly to the catchall stub and don't strong alias twice.

split init and errno to a separate file. No point in growing rtld 10K.

- Allow libpthread to be dlopened again, by providing libc stubs to libpthread.
- Fail if the dlopened libpthread does pthread_create(). From manu@
- Discussed at length in the mailing lists; approved by core@
- This was chosen as the least intrusive patch that will provide
the necessary functionality.
XXX: pullup to 6

branches: 1.22.2; 1.22.4; 1.22.8;
Use __dead

Make threaded programs die correctly:

kill(getpid(), SIGFOO) -> raise(SIGFOO)

branches: 1.20.6; 1.20.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.19.4;
add fw decl.

fix obvious bogon [can't alias symbol to itself]

Add thr_curcpu(), pthread_curcpu_np().

Add pthread_equal() to libc stubs; this makes a lot of sense for
threadsafe libraries implementing own locking functions.
Ride on yesterday's minor version bumps.

- stack_protector.c doesn't really belong under sys/. Add a new directory
for misc support routines and put it there.
- Add a libc constructor. Use this to initialize threading and the
stack protector stuff. libpthread cannot be initialized safely using
its own constructor because libc and libpthread are deeply intertwined.
PR bin/37347

branches: 1.14.10;
WARNS=4

Add missing __RCSID()

Fix the __libc_thr_yield_stub() signature.

The __libc_thr_yield_stub() for scched_yield() should return int (and
a 0), not void.

Implement __libc_thr_sigsetmask_stub() in terms of sigprocmask(),
instead of having a dummy function.

Add a stub for setcancelstate().

Add #include <stdlib.h> for exit definition.

Simple TSD implementation, since some thread-safe libraries want
to use it.

Make thr_self() not return NULL.

Add some threadlib stubs that are used by X:
* thr_create() (stub in libc aborts)
* thr_exit() (stub in libc calls exit())
* thr_yield() (stub in libc does nothing)

Also make the libc thr_self() stub not abort.

XXX Should we add thrattr_*() stubs for setting the detach-state?

Add mutexattr_init(), mutexattr_destroy(), and mutexattr_settype() (recursive
mutexes are used by the X libraries).

Make the libc thr_once() stub functional.

Merge the nathanw_sa branch.

branches: 1.1.2;
file thread-stub.c was initially added on branch nathanw_sa.