Commit Graph

710 Commits

Author SHA1 Message Date
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
Eric van Gyzen
3f8455b090 Add clock_nanosleep()
Add a clock_nanosleep() syscall, as specified by POSIX.
Make nanosleep() a wrapper around it.

Attach the clock_nanosleep test from NetBSD. Adjust it for the
FreeBSD behavior of updating rmtp only when interrupted by a signal.
I believe this to be POSIX-compliant, since POSIX mentions the rmtp
parameter only in the paragraph about EINTR. This is also what
Linux does. (NetBSD updates rmtp unconditionally.)

Copy the whole nanosleep.2 man page from NetBSD because it is complete
and closely resembles the POSIX description. Edit, polish, and reword it
a bit, being sure to keep any relevant text from the FreeBSD page.

Reviewed by:	kib, ngie, jilles
MFC after:	3 weeks
Relnotes:	yes
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D10020
2017-03-19 00:51:12 +00:00
Pedro F. Giffuni
649702c5a3 Make use of clang nullability attributes.
Replace uses of the GCC __nonnull__ attribute with the clang nullability
qualifiers. The replacement should be transparent for clang developers as
the new qualifiers will produce the same warnings and will be useful for
static checkers but will not cause aggressive optimizations.

GCC will not produce such warnings and developers will have to use
upgraded GCC ports built with the system headers from r312538.

Hinted by:	Apple's Libc-1158.20.4, Bionic libc
MFC after:	11.1 Release

Differential Revision:	https://reviews.freebsd.org/D9004
2017-01-28 20:54:43 +00:00
Ed Maste
2d0e733b3a libthr: coalesce repeated #if blocks 2017-01-25 20:19:48 +00:00
Enji Cooper
58368ba984 Use SRCTOP-relative paths to other directories instead of .CURDIR-relative ones
This implifies pathing in make/displayed output

MFC after:    3 weeks
Sponsored by: Dell EMC Isilon
2017-01-20 04:32:19 +00:00
Enji Cooper
cdebaff820 Upgrade NetBSD tests to 01.11.2017_23.20 snapshot
This contains some new testcases in /usr/tests/...:

- .../lib/libc
- .../lib/libthr
- .../lib/msun
- .../sys/kern

Tested on:	amd64, i386
MFC after:	1 month
2017-01-13 03:33:57 +00:00
Konstantin Belousov
4dafad49c6 Do not leak curthread->inact_mtx when cancelling in pthread_cond_wait(3).
Leave robust-protected region before checking for cancellation by
calling _thr_testcancel().  Otherwise, if cancelling request was
pending, the cancel handler is called with the dandling inact_mtx,
which triggers an assert if any mutex operation is performed by the
handler.

Reported and tested by:	Dimitri Staessens <dimitri.staessens@intec.ugent.be>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2016-12-06 17:13:17 +00:00
Marcel Moolenaar
2b4da8aa20 When MAKEOBJDIRPREFIX points to a case-insensitive file system, the
build can break when different source files create the same target
files (case-insensitivity speaking).  This is the case for object
files compiled with -fpic and shared libraries. The former uses
an extension of ".So", and the latter an extension ".so".  Rename
shared object files from *.So to *.pico to match what NetBSD does.

See also r305855

MFC after:	1 month
Sponsored by:	Bracket Computing
Differential Revision:	https://reviews.freebsd.org/D7906
2016-09-24 15:11:27 +00:00
Konstantin Belousov
1c1cc89580 The fdatasync(2) call must be cancellation point.
Sponsored by:	The FreeBSD Foundation
MFC after:	13 days
2016-08-16 08:27:03 +00:00
Adrian Chadd
cb916ce754 [mips] convert over =v to =r for the inline assembly.
Later gcc and clang have deprecated =v (which maps to a specific temp
register) and instead we should just use =r to have the assembler
(hopefully!) save/restore things appropriately after choosing
a register.

Tested:

* AR9344 SoC, with userreg support
* AR9331 SoC, with no userreg support

Sponsored by:	Sponsored by: DARPA, AFRL (MIPS TLS user register work)
2016-08-14 19:04:37 +00:00
Adrian Chadd
b812fe4d6b [mips] add support for using the MIPS user register for TLS data.
This work, originally from Stacey Son, uses the MIPS UserReg for
reading the TLS data, and will fall back to the normal syscall path
when it isn't supported.

This code dynamically patches cpu_switch() to bypass the UserReg
instruction so to avoid generating a machine exception.

Thanks to sson for the original work, and to Dan Nelson for
bringing it to date and testing it on MIPS32 with me.

Tested:

* mips64 (sson)
* mips74k (dnelson_1901@yahoo.com) - AR9344 SoC, UserReg support
* mips24k (adrian) - AR9331 SoC, no UserReg support

Obtained from:	sson, dnelson_1901@yahoo.com
2016-08-07 01:29:55 +00:00
Konstantin Belousov
b585cd3e2c Add __cxa_thread_atexit(3) API implementation.
This is the backing feature to implement C++11 thread storage duration
specified by the thread_local keyword.  A destructor for given
thread-local object is registered to be executed at the thread
termination time using __cxa_thread_atexit().  Libc calls the
__cxa_thread_calls_dtors() during exit(3), before finalizers and
atexit functions, and libthr calls the function at the thread
termination time, after the stack unwinding and thread-specific key
destruction.

There are several uncertainties in the API which lacks a formal
specification.  Among them:
- is it allowed to register destructors during destructing;
	we allow, but limiting the nesting level.  If too many iterations
	detected, a diagnostic is issued to stderr and thread forcibly
	terminates for now.
- how to handle destructors which belong to an unloading dso;
	for now, we ignore destructor calls for such entries, and
	issue a diagnostic.  Linux does prevent dso unload until all
	threads with destructors from the dso terminated.
It is supposed that the diagnostics allow to detect real-world
applications relying on the above details and possibly adjust
our implementation.  Right now the choices were to provide the slim
API (but that rarely stands the practice test).

Tests are added to check generic functionality and to specify some of
the above implementation choices.

Submitted by:	Mahdi Mokhtari <mokhi64_gmail.com>
Reviewed by:	theraven
Discussed with:	dim (detection of -std=c++11 supoort for tests)
Sponsored by:	The FreeBSD Foundation (my involvement)
MFC after:	2 weeks
Differential revisions:	https://reviews.freebsd.org/D7224,
    https://reviews.freebsd.org/D7427
2016-08-06 13:32:40 +00:00
Konstantin Belousov
bf890e4877 Remove empty initializer for the once facility. It was not needed
since r179417.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2016-07-27 15:14:11 +00:00
Konstantin Belousov
4edfc1e3bf Revert r302194, there are issues with some applications after changing
the return value, in particular console-kit-daemon.

Reported by:	Ivan Klymenko <fidaj@ukr.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Approved by:	re (gjb)
2016-06-25 20:20:24 +00:00
Konstantin Belousov
a068480247 For pthread_mutex_trylock() call on owned error-check or non-portable
adaptive mutex, return EDEADLK as required by POSIX.  The
pthread_mutex_lock() is already compliant.

Tested by:	Guy Yur <guyyur@gmail.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Approved by:	re (gjb)
2016-06-25 11:30:40 +00:00
Konstantin Belousov
7d6906b804 Fix markup.
Sponsored by:	The FreeBSD Foundation
2016-06-04 20:20:14 +00:00
Conrad Meyer
c72ef5eab3 libthr: Use formatted PANIC()
No functional change, although _thread_printf() may be slightly less functional
or render some values differently from libc snprintf(3).  No ABI change.

Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D6672
2016-06-01 16:12:26 +00:00
Conrad Meyer
a3c0056121 libthr: _thread_vprintf: Enhance support for %p, %#x
No functional change.  No ABI change.

Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D6672
2016-06-01 16:11:09 +00:00
Conrad Meyer
3a7d122f96 libthr: Add vprintf variant of _thread_printf, formatted PANIC()
No ABI change.

Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D6672
2016-06-01 16:09:56 +00:00
Konstantin Belousov
6180f50bbb Stop inlining the struct ucond definition into struct pthread_cond.
This avoids unneccessary casts and make the calls to _thr_ucond_*()
functions less questionable.

The c_spare field was not included into struct pthread_cond, so the
change modifies libthr ABI for shared condvars.  But since an off-page
does not legitimately contains any other data past the struct
pthread_cond, the change keeps shared condvars from pre- and post-
changed libthr compatible.  Also note that the whole struct ucond was
never copied in or out by kernel.

For private condvars, the privately allocated memory was never exposed
outside libthr.

Sponsored by:	The FreeBSD Foundation
2016-05-29 19:35:55 +00:00