Commit Graph

729 Commits

Author SHA1 Message Date
Konstantin Belousov
65174f684c Fix _pthread_cancel_enter() and _pthread_cancel_leave() jmptable entries.
PR:	240022
Reported by:	Andrew Gierth <andrew@tao11.riddles.org.uk>
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
2019-08-21 19:53:50 +00:00
Brandon Bergren
bdccf0bbac Implement _umtx_op_err.S on powerpc / powerpc64.
As per r177853, we need to avoid using errno inside user mutex code, since
 signal handlers can interfere with it and mess up libthr internal state.

So, implement _umtx_op_err() instead, which makes a raw syscall and
returns the error value directly instead of using errno.

Approved by: jhibbits (mentor)
Differential Revision: https://reviews.freebsd.org/D20946
2019-08-09 20:16:38 +00:00
Konstantin Belousov
3638455c92 Avoid conflicts with libc symbols in libthr jump table.
In some corner cases of static linking and unexpected libraries order
on the linker command line, libc symbol might preempt the same libthr
symbol, in which case libthr jump table points back to libc causing
either infinite recursion or loop.  Handle all of such symbols by
using private libthr names for them, ensuring that the right pointers
are installed into the table.

In collaboration with: arichardson
PR:	239475
Tested by:	pho
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D21088
2019-07-31 20:04:39 +00:00
Konstantin Belousov
0ab1bfc7b2 Avoid conflicts with libc symbols in libthr jump table.
In some corner cases of static linking and unexpected libraries order
on the linker command line, libc symbol might preempt the same libthr
symbol, in which case libthr jump table points back to libc causing
either infinite recursion or loop.  Handle all of such symbols by
using private libthr names for them, ensuring that the right pointers
are installed into the table.

In collaboration with: arichardson
PR:	239475
Tested by:	pho
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D21088
2019-07-31 19:27:20 +00:00
Konstantin Belousov
3212ada519 Restore ability to pass NULL name argument to pthread_set_name_np(3)
to clear the thread name.

PR:	239142
Submitted by:	Lewis Donzis <lew@perftech.com>
MFC after:	3 days
2019-07-11 16:19:33 +00:00
Konstantin Belousov
2d8c3eeb12 Add libc stub for pthread_getthreadid_np(3).
Requested by:	jbeich
PR:	238650
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-06-23 10:50:26 +00:00
Konstantin Belousov
b8f75b175c Do not access mutex memory after unlock.
PR:	237195
Reported by:	freebsd@hurrikhan.eu
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-04-12 17:27:19 +00:00
Konstantin Belousov
5d00c5a657 Fix initial exec TLS mode for dynamically loaded shared objects.
If dso uses initial exec TLS mode, rtld tries to allocate TLS in
static space. If there is no space left, the dlopen(3) fails. If space
if allocated, initial content from PT_TLS segment is distributed to
all threads' pcbs, which was missed and caused un-initialized TLS
segment for such dso after dlopen(3).

The mode is auto-detected either due to the relocation used, or if the
DF_STATIC_TLS dynamic flag is set.  In the later case, the TLS segment
is tried to allocate earlier, which increases chance of the dlopen(3)
to succeed.  LLD was recently fixed to properly emit the flag, ld.bdf
did it always.

Initial test by:	dumbbell
Tested by:	emaste (amd64), ian (arm)
Tested by:	Gerald Aryeetey <aryeeteygerald_rogers.com> (arm64)
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D19072
2019-03-29 17:52:57 +00:00
Ed Maste
09b47fc1c2 revert r341429 "disable BIND_NOW in libc, libthr, and rtld"
r345620 by kib@ fixed the rtld issue that caused a crash at startup
during resolution of libc's ifuncs with BIND_NOW.

PR:		233333
Sponsored by:	The FreeBSD Foundation
2019-03-28 02:12:32 +00:00
Mark Johnston
b16150ea90 Have pthread_cond_destroy() return EBUSY if the condvar has waiters.
This is not required of a compliant implementation, but it's easy to
check for and helps improve compatibility with other common
implementations.  Moreover, it's consistent with our
pthread_mutex_destroy().

PR:		234805
Reviewed by:	jhb, kib, ngie
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19496
2019-03-08 21:07:08 +00:00
Leandro Lupori
9031358d67 silence cast-align warnings from clang on powerpc64
silence the following warning when compiling libthr with clang 8
for powerpc64 architecture:

usr/src/lib/libthr/arch/powerpc/include/pthread_md.h:82:10: error:
cast from 'uint8_t *' (aka 'unsigned char *') to 'struct tcb *'
increases required alignment from 1 to 8 [-Werror,-Wcast-align]
82:  return ((struct tcb *)(_tp - TP_OFFSET));

Submitted by:	alfredo.junior_eldorado.org.br
Reviewed by:	git_bdragon.rtk0.net, emaste, kib, jhibbits, luporl
Differential Revision:	https://reviews.freebsd.org/D18807
2019-02-13 18:28:53 +00:00
Konstantin Belousov
e4314da2e4 Fixes for very early use of the pthread_mutex_* and libthr malloc.
When libthr is statically linked into the binary, order of the
constructors execution is not deterministic.  It is possible for the
application constructor to use pthread_mutex_* functions before the
libthr initialization was done.

Handle it by:
- making thr_malloc.c locking functions operational when curthread is not
  yet set;
- making __thr_malloc_init() idempotent, allowing more than one call to it;
- unconditionally calling __thr_malloc_init() before initializing
  a process-private mutex.

Reported and tested by:	mmel
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-02-04 21:16:15 +00:00
Konstantin Belousov
d49ca25de6 Rename rtld-elf/malloc.c to rtld-elf/rtld_malloc.c.
Then malloc.c file name is too generic to use it for libthr.a.

Sponsored by:	The FreeBSD Foundation
MFC after:	13 days
2019-01-30 16:28:27 +00:00
Konstantin Belousov
381c2d2e9a Untangle jemalloc and mutexes initialization.
The need to use libc malloc(3) from some places in libthr always
caused issues.  For instance, per-thread key allocation was switched to
use plain mmap(2) to get storage, because some third party mallocs
used keys for implementation of calloc(3).

Even more important, libthr calls calloc(3) during initialization of
pthread mutexes, and jemalloc uses pthread mutexes.  Jemalloc provides
some way to both postpone the initialization, and to make
initialization to use specialized allocator, but this is very fragile
and often breaks.  See the referenced PR for another example.

Add the small malloc implementation used by rtld, to libthr. Use it in
thr_spec.c and for mutexes initialization. This avoids the issues with
mutual dependencies between malloc and libthr in principle.  The
drawback is that some more allocations are not interceptable for
alternate malloc implementations.  There should be not too much memory
use from this allocator, and the alternative, direct use of mmap(2) is
obviously worse.

PR:	235211
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D18988
2019-01-29 22:46:44 +00:00
Brooks Davis
52af996782 Remove declarations of syscalls not used in libthr.
Reviewed by:	kib
Sponsored by:	DARPA, AFRL
2018-12-03 22:09:23 +00:00
Ed Maste
0e450664ad disable BIND_NOW in libc, libthr, and rtld
An issue remains with BIND_NOW and processes using threads.  For now,
restore libc's BIND_NOW disable, and also disable BIND_NOW in rtld and
libthr.

A patch is in review (D18400) that likely fixes this issue, but just
disable BIND_NOW pending further testing after it is committed.

PR:		233333
Sponsored by:	The FreeBSD Foundation
2018-12-03 15:59:46 +00:00
Eric van Gyzen
dbb1c64e82 Use _thr_isthreaded() and _thr_setthreaded() wrappers
...instead of directly using the global variable.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
2018-11-30 03:02:49 +00:00
Eric van Gyzen
ad8c236b28 _thr_setthreaded() cannot fail; change return type to void
Also remove logic to avoid unnecessary stores to the global variable.
Thread creation and destruction are heavy enough that any supposed savings
is in the noise.

MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
2018-11-30 03:01:32 +00:00
Edward Tomasz Napierala
a4f02d5d6d Make libthr(3) use sysconf(_SC_NPROCESSORS_CONF); this shaves off
two calls to sysctl(2) from the binary startup.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D18046
2018-11-19 18:24:08 +00:00
Pedro F. Giffuni
ab82c6bdad libthr: minor spacing cleanup.
No functional change.

X-MFC with:	r337992
2018-08-21 01:33:25 +00:00
Pedro F. Giffuni
b6413b6db8 POSIX compliance improvements in the pthread(3) functions.
This basically adds makes use of the C99 restrict keyword, and also
adds some 'const's to four threading functions: pthread_mutexattr_gettype(),
pthread_mutexattr_getprioceiling(), pthread_mutexattr_getprotocol(), and
pthread_mutex_getprioceiling. The changes are in accordance to POSIX/SUSv4-2018.

Hinted by:	DragonFlyBSD

Relnotes:	yes
MFC after:	1 month
Differential Revision:	D16722
2018-08-18 01:05:38 +00:00
Konstantin Belousov
4627d47bc8 Add pthread_get_name_np(3).
The function retrieves the thread name previously set by
pthread_set_name_np(3). The name is cached in the process memory.

Requested by:	Willem Jan Withagen <wjw@digiware.nl>
Man page update:	Yuri Pankov <yuripv@yuripv.net>
Reviewed by:	ian (previous version)
Discussed with:	arichardson, bjk (man page)
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D16702
2018-08-17 18:34:07 +00:00
Konstantin Belousov
b1bd4736a9 Remove unused file.
The thr_new(2) syscall is called through libc stub.  r154212 stopped
generating it for libthr but did not cleaned the unused remnants.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2018-06-16 17:11:23 +00:00
John Baldwin
9c4a7c50ae Remove references to the LIBC_SCCS and SYSLIBC_SCCS C macros.
This language dates back to when libthr was libc_r that included its own
syscalls and replaced libc entirely.  It hasn't been relevant for a long
time.
2018-05-23 17:05:12 +00:00
John Baldwin
dc3566067a Ensure thread library is initialized in pthread_testcancel().
Call _thr_check_init() before reading curthread in pthread_testcancel().

If a constructor in a library creates a semaphore via sem_init() and
then waits for it via sem_wait(), the program can core dump in
_pthread_testcancel() called from sem_wait().  This is because the
semaphore implementation lives in libc, so the library's constructors
can be run before libthr's constructors.

Reported by:	arichardson
Reviewed by:	kib
Obtained from:	CheriBSD
MFC after:	1 week
Sponsored by:	DARPA / AFRL
Differential Revision:	https://reviews.freebsd.org/D14786
2018-03-21 21:13:26 +00:00
Pedro F. Giffuni
b9b20abf2b libthr: Fix missing break in switch.
This is also a warning in recent GCC with -Wimplicit-fallthrough.

CID:	1356262
Obtained from:	DragonFly (git 0f037c78 - partial)
2018-01-27 22:27:55 +00:00
Pedro F. Giffuni
5e53a4f90f lib: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00
Pedro F. Giffuni
8a16b7a18f General further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.
2017-11-20 19:49:47 +00:00
Pedro F. Giffuni
df57947f08 spdx: initial adoption of licensing ID tags.
The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Initially, only tag files that use BSD 4-Clause "Original" license.

RelNotes:	yes
Differential Revision:	https://reviews.freebsd.org/D13133
2017-11-18 14:26:50 +00:00
Warner Losh
25dfe63ccb Use MACHINE_CPUARCH in preference MACHINE for userland.
Sponsored by: Netflix
2017-11-07 09:57:26 +00:00
Bryan Drewery
ea825d0274 DIRDEPS_BUILD: Update dependencies.
Sponsored by:	Dell EMC Isilon
2017-10-31 00:07:04 +00:00
Michal Meloun
f879eb0488 Fix misleading comment.
Not a functional change.

MFC after:	3 days
2017-10-29 14:26:37 +00:00
Michael Zhilin
37a6f46190 [libthr] revert change of visibility of _thread_keytable to unbreak debugger
Fix regression by r318539. The sysutils/pstack uses library libthread_db to
read information about threads state. The function pt_ta_new makes lookup of
several key symbols including _thread_keytable. But r318539 mades this field
static. It causes silent ignore of libthr library by pstack and as result
sysutils/pstack doesn't output any thread information.

This fix changes this field back to non-static.

MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D11738
2017-10-02 20:33:16 +00:00
Enji Cooper
d511b20a69 Add HAS_TESTS to all Makefiles that are currently using the
`SUBDIR.${MK_TESTS}+= tests` idiom.

This is a follow up to r321912.
2017-08-02 08:50:42 +00:00
Enji Cooper
4b330699f8 Convert traditional ${MK_TESTS} conditional idiom for including test
directories to SUBDIR.${MK_TESTS} idiom

This is being done to pave the way for future work (and homogenity) in
^/projects/make-check-sandbox .

No functional change intended.

MFC after:	1 weeks
2017-08-02 08:35:51 +00:00
Pedro F. Giffuni
1c9158aabe libthr: check for possible overflow in the pthread_barrier_init() count.
Following up on r320900, where the check for negative count values was
removed, add a check to prevent integer overflow. This is to account that
b_count, b_waiters but most importantly the total number of threads in
the system are signed values.

Discussed with:	kib
MFC after:	2 weeks
2017-07-15 15:00:13 +00:00
Pedro F. Giffuni
97c3a994e4 libthr: 'count' is unsigned so don't check for negative values.
Obtained from:	DragonFlyBSD (git e7db8139)
2017-07-14 16:05:54 +00:00
Eric van Gyzen
afba14e2b8 libthr: increase WARNS to the default (6)
...and silence cast-align warnings from gcc.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10935
2017-05-26 15:57:54 +00:00
Eric van Gyzen
718fb5ba5b libthr: fix warnings at WARNS=6
Fix more warnings about redundant declarations.

Reviewed by:	kib emaste
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10932
2017-05-26 15:56:28 +00:00
Eric van Gyzen
01618b339f libthr: fix style in previous commit
I intended to add this to the previous commit.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
2017-05-26 15:53:27 +00:00
Eric van Gyzen
d25183e0a7 libthr: prevent setcontext() from masking SIGTHR
__thr_setcontext() mistakenly tested for the presence of SIGCANCEL
in its local ucontext_t instead of the parameter. Therefore,
if a thread calls setcontext() with a context whose signal mask
contains SIGTHR (a.k.a. SIGCANCEL), that signal will be blocked,
preventing the thread from being cancelled or suspended.

Reported by:	gcc 6.1 via RISC-V tinderbox
Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10933
2017-05-26 15:51:51 +00:00
Eric van Gyzen
5a6d7b723f libthr: fix warnings from GCC when WARNS=6
Fix warnings about:
- redundant declarations
- a local variable shadowing a global function (dlinfo)
- an old-style function definition (with an empty parameter list)
- a variable that is possibly used uninitialized

"make tinderbox" passes this time, except for a few unrelated
kernel failures.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10870
2017-05-23 16:12:50 +00:00
Eric van Gyzen
cfc1010f6d Revert r318583 (libthr: use default WARNS level of 6)
Revert this while I fix RISC-V, SPARC, and probably all architectures
that use GCC.

Reported by:	kib
Pointy hat to:	vangyzen
Sponsored by:	Dell EMC
2017-05-22 13:21:28 +00:00
Eric van Gyzen
0b2f3f2058 libthr: Use CLI flags instead of pragmas to disable warnings
People tweaking the build system or compilers tend to look into
the Makefile and not into the source.  Having some warning controls
in the Makefile and some in the source code is surprising.

Pragmas have the advantage that they leave the warnings enabled
for more code, but that advantage isn't very relevant in these cases.

Requested by:	kib
Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10832
2017-05-20 17:33:47 +00:00
Eric van Gyzen
d71b289766 libthr: use default WARNS level of 6
Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10832
2017-05-20 17:32:30 +00:00
Eric van Gyzen
07f29d9f76 Remove old spinlock_debug code from libc
This no longer seems useful.  Remove it.

This was prompted by a "cast discards volatile qualifier" warning
in libthr when WARNS=6.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10832
2017-05-20 17:32:01 +00:00
Eric van Gyzen
048ad6aedc libthr: change CHECK_AND_INIT_RWLOCK to an inline function
This was prompted by a compiler warning about 'ret' shadowing
a local variable in the callers of the macro.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10832
2017-05-20 17:30:48 +00:00
Eric van Gyzen
6eccf6e38f libthr: disable thread-safety warnings
These warnings don't make sense for code that implements
the locking primitives.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10832
2017-05-20 17:29:36 +00:00
Eric van Gyzen
d2335a57f4 libthr: fix warnings at WARNS=6
Fix warnings about the following when WARNS=6 (which I will commit soon):

- casting away const
- no previous 'extern' declaration for non-static variable
- others as explained by #pragmas and comments
- unused parameters

The last is the only functional change.

Reviewed by:	kib
MFC after:	3 days
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10808
2017-05-19 13:04:05 +00:00
Jason Evans
c45e7190ab Fix __pthread_mutex_trylock() to call THR_CRITICAL_LEAVE() on failure rather
than on success.  This regression was introduced by r300043 (Add implementation
of robust mutexes...).

MFC after:	1 day
2017-05-13 17:49:53 +00:00