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* replace the flockfile backend with a per FILE recursive mutex.dlg2025-08-041-1/+7
| | | | | | | | | | | | | | | the flockfile implementation in thread/rthread_file.c used an external lock, and associated it with the relevant FILE * as needed. this isn't great for a lot of reasons, complexity being the big one, but the straw that broke the camels back is that it uses a single spinlock to coordinate all of this, which in turn generates a lot of sched_yield syscalls. this avoids all the code complexity and the spinlock by just embedding a small __rctmx in every FILE. tested by and ok tb@ jca@ ok claudio@
* This thread-aware profiling support diff comes from Yuichiro NAITO.deraadt2025-07-161-1/+5
| | | | | | | | | | | | At runtime, profiling data is stored per-thread. Upon termination, the per-thread profiling data pools are merged into a into a single record, which is then written out (using the new kernel-assisted system). I think the original gmon merging parts may have come from or been inspired by someone at NetBSD. This has been delayed because there were concerns about adding a TLS object which would require other library cranks, so this rides all the major cranks today. ok kettenis tb claudio sthen etc etc etc
* add libc specific __cmtx and __rcmtx locks for internal use.dlg2025-07-121-1/+55
| | | | | | | | | | | | | | | | | | | | | | | __cmtx provides mutual exclusion using futex(2) and cas on archs that support it, or _spinlocks on the rest. __rcmtx is a recursive mutex built on top of __cmtx, so it inherits the use of futex and cas/spinlock from __cmtx. until now the options we had for locking between threads in libc were spinlocks or pthread mutexes. spinlocks use sched_yield to relax if they have to spin on a contended lock, which we are trying to minimise the use of as much as possible. pthread_mutex is relatively large in memory and offers a lot of complicated features which are unecessary for most of libc. the non cas/futex version of pthread_mutexes currently relies on __thrsleep and __thrwakeup, which we also want to deprecate. having a small futex based lock available everywhere will help us move away from overuse of spinlocks, and deprecate __thrsleep and __thrwakeup. ok kettenis@ jca@ provided his eyes too.
* Use struct __sFILE instead of FILE in thread locking callbackguenther2024-08-181-5/+6
| | | | | | | declarations to reduce <stdio.h> pollution. Declare __isthreaded in thread_private.h where it's really needed. ok deraadt@
* Fix two issues related to thread private data in asr.otto2021-01-061-3/+10
| | | | | | | | - setting up asr in single thread mode and then starting threads using asr would lead to multiple threads sharing the same resolver. - destruction of a thread that has been using asr would leak data. Problem originally reported by Alexey Sokolov and Uli Schlachter. ok kettenis@
* New futex(2) based rwlock implementation based on the mutex code.mpi2019-02-131-1/+12
| | | | | | | | | This implementation reduces contention because threads no longer need to spin calling sched_yield(2) before going to sleep. Tested by many, thanks! ok visa@, pirofti@
* Make the "not my pool" searching loop a tiny bit smarter, whileotto2019-01-101-2/+2
| | | | | | making the number of pools variable. Do not document the malloc conf settings atm, don't know yet if they will stay. Thanks to all the testers. ok deraadt@
* Implement __cxa_thread_atexit to support C++11 thread_local scope. Thekettenis2017-12-051-1/+2
| | | | | | | interface is also made available as __cxa_thread_atexit_impl to satisfy the needs of GNU libstdc++. ok guenther@, millert@
* Revert recent changes to unbreak ports/net/sambajca2017-11-041-2/+8
| | | | | | | | While it is not clear (to me) why that ports ends up with corrupted shared libs, reverting those changes fixes the issue and should allow us to close p2k17 more smoothly. Discussed with a bunch, ok ajacoutot@ guenther@
* Change pthread_cleanup_{push,pop} to macros that store the cleanup infoguenther2017-10-281-8/+2
| | | | | | | | | | | | | | on the stack instead of mallocing the list and move the APIs from libpthread to libc so that they can be used inside libc. Note: the standard was explicitly written to permit/support this "macro with unmatched brace" style and it's what basically everyone else already does. We xor the info with random cookies with a random magic to detect/trip-up overwrites. Major bump to both libc and libpthread due to the API move. ok mpi@
* Move mutex, condvar, and thread-specific data routes, pthread_once, andguenther2017-09-051-8/+177
| | | | | | | | pthread_exit from libpthread to libc, along with low-level bits to support them. Major bump to both libc and libpthread. Requested by libressl team. Ports testing by naddy@ ok kettenis@
* Wrap _malloc_init() so internal calls go directlyguenther2016-10-151-1/+4
| | | | | prodded by otto@ ok kettenis@ otto@
* Less lock contention by using more pools for mult-threaded programs.otto2016-09-011-9/+12
| | | | tested by many (thanks!) ok tedu, guenther@
* Use a Thread Information Block in both single and multi-threaded programs.guenther2016-05-071-133/+173
| | | | | | | | | | | | | | | | | 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@
* Make pthread_atfork() track the DSO that called it like atexit() does,guenther2015-04-071-1/+18
| | | | | | | | | | unregistering callbacks if the DSO is unloaded. Move the callback handling from libpthread to libc, though libpthread still overrides the inner call to handle locking and thread-library reinitialization. Major version bump for both libc and libpthread. verification that this fixes various ports ajacoutot@ asm assistance miod@; ok millert@ deraadt@
* Make consistent the syscall stubs for the syscalls that got specialguenther2011-10-161-1/+16
| | | | | | | | handling to fix up the alignment of 64bit arguments so that they do the same dance where _thread_sys_FOO is the real stub and FOO is a weak alias. For some of them, this is needed for cancellation handling. From discussions with fgsch@, ok millert@
* remove _thread_malloc_init prototypeotto2008-06-141-2/+1
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* remove _MALLOC_LOCK_INIT; major bump; ok deraadt@otto2008-06-131-5/+1
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* - make arc4random*() functions thread safe. Use a custom spinlock functionkurt2008-01-011-1/+13
| | | | | | | | | | | instead of the generic pthread macros since free(3) uses __arc4_getbyte() when freeing small sized allocations and the generic pthread macros call malloc(3). - eliminate passing pointers to a static variable with global scope (rs) for additional code clarity and reduction. - shlib minor bumps for libc and libpthread due to new functions. From andreas@ with some bits from me. okay tedu@ marc@ w/some spot checking from millert@
* fix misleading comment; the _MUTEX_LOCK/_MUTEX_UNLOCK macros work withkurt2007-11-191-2/+2
| | | | both static and non-static mutexs.
* _FD_LOCK/UNLOCK() is libpthread specific and not needed for librthread, sokurt2007-06-051-21/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | isolate its usage to libpthread only and replace with generic non-static mutex support in the one place it is needed: - remove _FD_LOCK/UNLOCK from lseek and ftruncate in libc and make the functions weak so that libpthread can override with its own new versions that do the locking. - remove _thread_fd_lock/unlock() weak functions from libc and adjust libpthread for the change. - add generic _thread_mutex_lock/unlock/destroy() weak functions in libc to support non-static mutexes in libc and add libpthread and librthread implementations for them. libc can utilize non-static mutexes via the new _MUTEX_LOCK/UNLOCK/DESTROY() macros. Actually these new macros can support both static and non-static mutexes but currently only using them for non-static. - make opendir/closedir/readdir/readdir_r/seekdir/telldir() thread-safe for both thread libraries by using a non-static mutex in the struct _dirdesc (typedef DIR), utilizing it in the *dir functions and remove remaining and incorrect _FD_LOCK/UNLOCK() use in libc. - add comments to both thread libraries to indicate libc depends on the current implementation of static mutex initialization. suggested by marc@ - major bump libc and libpthread due to function removal, structure change and weak symbol conversions. okay marc@, tedu@
* Part 2 of file descriptor race and deadlock corrections.kurt2006-09-261-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adjust design of file descriptor table to eliminate races with both opening and closing of file descriptor entries and eliminates one class of deadlocks. One nice side effect of this change in design should be better performance for applications that open and close many file descriptors due to reduced fd_table_lock contention and fd entry reuse. - Add entry states to manage use of entry and eliminate some closing races. fd entries are not deallocated upon close() now. - Call _thread_fd_table_init with one of five discreet modes to properly initialize an entry and manage the state transition to open. - When closing an entry hold the entry spinlock locked across the state transition and the _thread_sys_close call to close another race. - Introduce a new lock type FD_RDWR_CLOSE that transitions either a closed entry or an open entry into closing state and then waits for a RDWR lock so that the lock queue can unwind normally. All subsequent fd lock attempts for that entry are rejected with EBADF until the fd is fully closed, or reopened by dup2(). Once a thread holds the FD_RDWR_LOCK it is safe to close() it or dup2() on it. - When a thread creates a new fd there is a window of time when another thread could attempt to use the fd before the creating thread has initialized the entry for it. This can result in improper status_flags for the entry, so record the entries init mode, detect when this has happened and correct the status_flags when needed. reviewed by marc@ & brad@, tested by several, okay brad@
* Avouid a race in atexit() handling by introducing a lock. Problemotto2006-02-221-1/+12
| | | | | originally reported by Gergely Kovacs; help from dhartmei@; ok tedu@ millert@
* Use a forward declaration of struct timespec instead of assumingmillert2005-11-151-1/+2
| | | | | | it has already been defined by previous includes. While this is true at the moment, it will no longer be true after a pending includes cleanup. OK marc@
* major bump to libc and libpthread to break the dependency of amarc2004-06-071-84/+76
| | | | | | particular implementation of libpthread for libc. libc no longer needs pthread.h to compile. OK millert@, brad@, tedu@
* thread safer libc (note: safer, not safe)marc2003-01-281-1/+10
| | | | | | | | | | Access to the global _res structure replaced by pointers to a per thread instance. If unthreaded the pointer is to the global structure. Also replaced a 64k stack array with malloc-ed memory so threaded aps (with a default 64k stack) have a chance at working. ok deraadt@
* thread safe libc -- 2nd try. OK miod@, millert@marc2002-11-051-40/+30
| | | | Thanks to miod@ for m68k and vax fixes
* back out previous patch.. there are still some vax/m68k issuesmarc2002-11-031-30/+40
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* libc changes for thread safety. Tested on:marc2002-11-031-40/+30
| | | | | | | alpha (millert@), i386 (marc@), m68k (millert@ and miod@), powerpc (drahn@ and dhartmei@), sparc (millert@ and marc@), sparc64 (marc@), and vax (millert@ and miod@). Thanks to millert@, miod@, and mickey@ for fixes along the way.
* Part one of userland __P removal. Done with a simple regexp with some minor ↵millert2002-02-161-2/+2
| | | | hand editing to make comments line up correctly. Another pass is forthcoming that handles the cases that could not be done automatically.
* put changes back, this time ALL the files.fgsch2001-09-041-3/+3
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* Back out fgsch@'s tree breaking commits.todd2001-08-301-3/+3
| | | | Test next time, ok?
* fix some const warningsfgsch2001-08-301-3/+3
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* #(endif|else) foo is incorrect, make it #endif /* foo */heko2001-08-121-2/+2
| | | | deraadt@ ok
* grammer/spellingtodd2001-01-041-2/+2
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* typo in comment, AILASES -> ALIASESbrad2000-09-081-2/+2
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* oopsd2000-01-061-2/+2
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* rewrite to use the helpers in the thread/ directory and to define weak alias ↵d2000-01-061-135/+91
| | | | macros
* cleand1999-01-061-35/+39
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* Add thread-safety to libc, so that libc_r will build (on i386 at least).d1998-11-201-0/+175
All POSIX libc api now there (to P1003.1c/D10) (more md stuff is needed for other libc/arch/*) (setlogin is no longer a special syscall) Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS). Doc some re-entrant routines Add libc_r to intro(3) dig() uses some libc srcs and an extra -I was needed there. Add more md stuff to libc_r. Update includes for the pthreads api Update libc_r TODO
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