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2011-05-11commentary typo fixBernhard Reutner-Fischer
use cancellation (with two 'l') uniformly. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-02-24linuxthreads.old: fix nommu initial thread stack detectionMike Frysinger
Because the nommu address space is flat, and the application stack can literally be located anywhere, we cannot rely on the assumptions that the mmu port gets away with. Namely, that the first thread's stack lives at the top of memory and nothing will be created above it. Currently, the code rounds the current stack up a page and sets that as the "top" of the stack, and then marks the "bottom" of the stack as "1". Then as new threads are created, this assumption is further refined by slowly backing off the "bottom" when a new stack is created within the range of the initial stack. Simple ascii example (tid0 is the initial thread): 1 thread: [bos tid0 stack tos] 2 threads: [ tid0 stack ] [tid1 stack] 3 threads: [ tid0 stack ] [tid1 stack] [tid2 stack] As you can kind of see, this algorithm operates on one basic assumption: the initial top of stack calculation is the absolute top of the stack. While this assumption was fairly safe in the original nommu days of yore where the only file format was FLAT (which defaults to a 4KiB stack -- exactly 1 page), and memory was fairly tight, we can see that this falls apart pretty quickly as soon as the initial stack is larger than a page. The issue that crops up now is simple to hit: start an application with an 8KiB stack, execute some functions that put pressure on the stack so that it exceeds 4KiB, then start up some threads. The initial tos will be rounded up by a page, but this is actually the middle of the stack. Now when the initial thread returns from its functions (thus unwinding the stack) and tries to call something which calls back into libpthread, the thread_self() func fails to detect itself as the initial thread as the current stack is now above the tos. The __pthread_find_self() func kicks in, walks all the thread arrays, fails to find a hit, and then walks into uninitialized memory for the thread descriptor. Use of this garbage memory has obvious results -- things fall down & go boom. To address this, I extend the current algorithm to automatically scale back both the bottom and the top stack limits of the initial thread. We use the current stack pointer at "thread boot time" only as a single known point. The initial thread stack bottom is set to the bottom of memory and the initial thread stack top is set to the top of memory. Then as we create new stack threads, we figure out whether the new stack is above or below the single known good address, and then scale back either the tos or the bos accordingly. Reviewed-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-17check if USE_TLS is defined before useHans-Christian Egtvedt
This patch will convert all the #ifdef USE_TLS and #if USE_TLS to #if defined(USE_TLS) && USE_TLS. By checking if the USE_TLS is defined before checking its value will result in correct behavior for architectures not defining this config symbol. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Acked-by: Carmelo AMOROSO <carmelo.amoroso@st.com>
2009-07-05Check #if feature test macros are defined where they may not beRon
Once again all of these reduce the noise from gcc-4.4. Replaces a few more (USE_TLS && HAVE___THREAD) with USE___THREAD while we need to mess with them for this anyhow. Signed-off-by: Ron Lee <ron@debian.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-02-25Reinstate __libc_foo's needed for linuxthreads.old.Denis Vlasenko
Now they are only enabled if linuxthreads.old are selected.
2008-12-14heed compiler warnings about checking non-defined variables in #if directivesDenis Vlasenko
2008-12-10*: remove some __libc_XXX functions:Denis Vlasenko
__libc_accept __libc_close __libc_connect __libc_creat __libc_creat64 __libc_fsync __libc_lseek __libc_lseek64 __libc_msync __libc_nanosleep __libc_open __libc_open64 __libc_pause __libc_read __libc_readv __libc_recv __libc_recvfrom __libc_recvmsg __libc_send __libc_sendmsg __libc_sendto __libc_tcdrain __libc_wait __libc_waitpid __libc_write __libc_writev They were removed from glibc 1 May 2004: http://sources.redhat.com/ml/libc-hacker/2004-05/msg00001.html
2008-12-01hostid: improve extremely unreadable partsDenis Vlasenko
*: remove checks of sigaction and sigprocmask results in cases where they clearly can't fail: sigaction(known_good_sig) sigprocmask(known_good_how) text data bss dec hex filename - 393 4 0 397 18d libc/pwd_grp/lckpwdf.o + 382 4 0 386 182 libc/pwd_grp/lckpwdf.o - 56 0 0 56 38 libc/signal/sigblock.o + 44 0 0 44 2c libc/signal/sigblock.o - 211 0 0 211 d3 libc/signal/sigset.o + 202 0 0 202 ca libc/signal/sigset.o - 56 0 0 56 38 libc/signal/sigsetmask.o + 44 0 0 44 2c libc/signal/sigsetmask.o - 309 0 0 309 135 libc/unistd/sleep.o + 256 0 0 256 100 libc/unistd/sleep.o
2008-12-01on Bernd's request, remove commented-out code snippetsDenis Vlasenko
2008-12-01optimize signal mask ops. comment out "impossible" errorsDenis Vlasenko
text data bss dec hex filename - 1179 13 2 1194 4aa libc/misc/syslog/syslog.o + 1165 13 2 1180 49c libc/misc/syslog/syslog.o - 435 4 0 439 1b7 libc/pwd_grp/lckpwdf.o + 393 4 0 397 18d libc/pwd_grp/lckpwdf.o - 38 0 0 38 26 libc/signal/sigandset.o + 32 0 0 32 20 libc/signal/sigandset.o - 63 0 0 63 3f libc/signal/sigblock.o + 56 0 0 56 38 libc/signal/sigblock.o - 22 0 0 22 16 libc/signal/sigempty.o + 20 0 0 20 14 libc/signal/sigempty.o - 25 0 0 25 19 libc/signal/sigfillset.o + 20 0 0 20 14 libc/signal/sigfillset.o - 34 0 0 34 22 libc/signal/sigisempty.o + 16 0 0 16 10 libc/signal/sigisempty.o - 38 0 0 38 26 libc/signal/sigorset.o + 32 0 0 32 20 libc/signal/sigorset.o - 119 0 0 119 77 libc/signal/sigpause.o + 113 0 0 113 71 libc/signal/sigpause.o - 215 0 0 215 d7 libc/signal/sigset.o + 211 0 0 211 d3 libc/signal/sigset.o - 63 0 0 63 3f libc/signal/sigsetmask.o + 56 0 0 56 38 libc/signal/sigsetmask.o - 194 0 1 195 c3 libc/stdlib/abort.o + 183 0 1 184 b8 libc/stdlib/abort.o - 323 0 0 323 143 libc/unistd/sleep.o + 309 0 0 309 135 libc/unistd/sleep.o
2008-11-29shring sugnal-relared stuff a bit. BTW why constant memset is not inlined by ↵Denis Vlasenko
gcc? text data bss dec hex filename - 38015 18096 8636 64747 fceb lib/libpthread-0.9.30-svn.so + 38001 18096 8636 64733 fcdd lib/libpthread-0.9.30-svn.so - 274842 1835 19012 295689 48309 lib/libuClibc-0.9.30-svn.so + 274779 1835 19012 295626 482ca lib/libuClibc-0.9.30-svn.so
2008-10-03- use c89-style commentsBernhard Reutner-Fischer
Closes issue #5194
2008-07-23- trim any trailing whitespaceBernhard Reutner-Fischer
2008-05-20- remove old-style definitions. No object-code changes.Bernhard Reutner-Fischer
2008-05-15make sure we store the function pointers to the real push/pop functions ↵Mike Frysinger
rather than the public weak ones so that the libc->libpthread forwarding code is able to work properly this should fix the case where libpthread.so is not linked directly, but rather via another library: app -> links to libfoo.so -> links to libpthread.so and any function (like readdir_r) that does: __UCLIBC_MUTEX_LOCK() __UCLIBC_MUTEX_UNLOCK()
2007-11-22Add hidden symbols for a number of pthread functions, and use them to ensureBernd Schmidt
that all entries in the __pthread_functions point to functions within libpthread, not identically-named functions in libc.
2007-01-11Peter Mazinger pointed out that my last commit was faulty.Joakim Tjernlund
This should fix it.
2006-11-09backport from upstream:Mike Frysinger
2001-04-10 Ulrich Drepper <drepper@redhat.com> * join.c (pthread_exit): Move code to new function __pthread_do_exit which takes an extra parameter with the current frame pointer. Call new function with CURRENT_STACK_FRAME. (__pthread_do_exit): New function. Call __pthread_perform_cleanup with the new parameter. (pthread_join): Call __pthread_do_exit instead of pthread_exit. * cancel.c (__pthread_perform_cleanup): Takes extra parameter. Use this parameter as the initial value the cleanup handler records are compared against. No active cleanup handler record must have an address lower than the previous one and the initial record must be above (below on PA) the frame address passed in. (pthread_setcancelstate): Call __pthread_do_exit instead of pthread_exit. (pthread_setcanceltype): Likewise. (pthread_testcancel): Likewise. (_pthread_cleanup_pop_restore): Likewise. * condvar.c (pthread_cond_wait): Likewise. (pthread_cond_timedwait_relative): Likewise. * manager.c (pthread_start_thread): Likewise. * oldsemaphore.c (__old_sem_wait): Likewise. * pthread.c (pthread_handle_sigcancel): Likewise. * semaphore.c (__new_sem_wait): Likewise. (sem_timedwait): Likewise. * ptlongjmp.c (pthread_cleanup_upto): Also use current stack frame to limit the cleanup handlers which get run. * internals.h: Add prototype for __pthread_do_exit. Adjust prototype for __pthread_perform_cleanup.
2006-02-27import ia64 linuxthreads filesMike Frysinger
2006-02-18tweak the idea between having a MMU and actually using itMike Frysinger
2006-02-04fix warning when building on non-mmu hostsMike Frysinger
2006-01-26prototypes for threads tooPeter S. Mazinger
2006-01-25make use of the internals provided earlierPeter S. Mazinger
2006-01-24Don't use __getpid/__getpagesizePeter S. Mazinger
2006-01-22Enable _GNU_SOURCE build wide, trying to get consistent interfaces, else IMA ↵Peter S. Mazinger
is a useless attempt
2006-01-04update pthread weak handling to the style glibc usesMike Frysinger
2005-12-29kill off some signedness/unused warningsMike Frysinger
2005-12-01Hide mostly used functionsPeter S. Mazinger
2005-11-15rename current stable linuxthreads to linuxthreads.old to prepare for import ↵Mike Frysinger
of latest glibc version