609cf61467
2006-10-17 Jakub Jelinek <jakub@redhat.com> * sunrpc/xdr_mem.c (xdrmem_setpos): Don't compare addresses as signed longs, check for x_base + pos overflow. * sunrpc/Makefile (tests): Add tst-xdrmem2. * sunrpc/tst-xdrmem2.c: New test. 2006-10-18 Ulrich Drepper <drepper@redhat.com> * elf/dl-lookup.c (_dl_lookup_symbol_x): Add warning to _dl_lookup_symbol_x code. 2006-10-17 Jakub Jelinek <jakub@redhat.com> * elf/dl-runtime.c: Include sysdep-cancel.h. (_dl_fixup, _dl_profile_fixup): Use __rtld_mrlock_* and scoperec->nusers only if !SINGLE_THREAD_P. Use atomic_* instead of catomic_* macros. * elf/dl-sym.c: Include sysdep-cancel.h. (do_sym): Use __rtld_mrlock_* and scoperec->nusers only if !SINGLE_THREAD_P. Use atomic_* instead of catomic_* macros. * elf/dl-close.c: Include sysdep-cancel.h. (_dl_close): Use __rtld_mrlock_* and scoperec->nusers only if !SINGLE_THREAD_P. Use atomic_* instead of catomic_* macros. * elf/dl-open.c: Include sysdep-cancel.h. (dl_open_worker): Use __rtld_mrlock_* and scoperec->nusers only if !SINGLE_THREAD_P. Use atomic_* instead of catomic_* macros. 2006-10-17 Jakub Jelinek <jakub@redhat.com> [BZ #3313] * malloc/malloc.c (malloc_consolidate): Set maxfb to address of last fastbin rather than end of fastbin array. 2006-10-18 Ulrich Drepper <drepper@redhat.com> * sysdeps/i386/i486/bits/atomic.h (catomic_decrement): Use correct body macro. * sysdeps/x86_64/bits/atomic.h (__arch_c_compare_and_exchange_val_64_acq): Add missing casts. (catomic_decrement): Use correct body macro. 2006-10-17 Jakub Jelinek <jakub@redhat.com> * include/atomic.h: Add a unique prefix to all local variables in macros. * csu/tst-atomic.c (do_test): Test also catomic_* macros. * include/link.h: Include <rtld-lowlevel.h>. Define struct
152 lines
4.8 KiB
C
152 lines
4.8 KiB
C
/* Defintions for lowlevel handling in ld.so.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _RTLD_LOWLEVEL_H
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#define _RTLD_LOWLEVEL_H 1
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#include <atomic.h>
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#include <lowlevellock.h>
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/* Special multi-reader lock used in ld.so. */
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#define __RTLD_MRLOCK_WRITER 1
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#define __RTLD_MRLOCK_RWAIT 2
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#define __RTLD_MRLOCK_WWAIT 4
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#define __RTLD_MRLOCK_RBITS \
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~(__RTLD_MRLOCK_WRITER | __RTLD_MRLOCK_RWAIT | __RTLD_MRLOCK_WWAIT)
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#define __RTLD_MRLOCK_INC 8
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#define __RTLD_MRLOCK_TRIES 5
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typedef int __rtld_mrlock_t;
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#define __rtld_mrlock_define(CLASS,NAME) \
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CLASS __rtld_mrlock_t NAME;
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#define _RTLD_MRLOCK_INITIALIZER 0
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#define __rtld_mrlock_initialize(NAME) \
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(void) ((NAME) = 0
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#define __rtld_mrlock_lock(lock) \
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do { \
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__label__ out; \
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while (1) \
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{ \
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int oldval; \
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for (int tries = 0; tries < __RTLD_MRLOCK_TRIES; ++tries) \
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{ \
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oldval = lock; \
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while (__builtin_expect ((oldval \
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& (__RTLD_MRLOCK_WRITER \
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| __RTLD_MRLOCK_WWAIT)) \
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== 0, 1)) \
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{ \
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int newval = ((oldval & __RTLD_MRLOCK_RBITS) \
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+ __RTLD_MRLOCK_INC); \
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int ret = atomic_compare_and_exchange_val_acq (&(lock), \
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newval, \
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oldval); \
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if (__builtin_expect (ret == oldval, 1)) \
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goto out; \
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} \
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atomic_delay (); \
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} \
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if ((oldval & __RTLD_MRLOCK_RWAIT) == 0) \
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{ \
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atomic_or (&(lock), __RTLD_MRLOCK_RWAIT); \
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oldval |= __RTLD_MRLOCK_RWAIT; \
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} \
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lll_futex_wait (lock, oldval); \
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} \
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out:; \
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} while (0)
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#define __rtld_mrlock_unlock(lock) \
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do { \
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int oldval = atomic_exchange_and_add (&(lock), -__RTLD_MRLOCK_INC); \
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if (__builtin_expect ((oldval \
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& (__RTLD_MRLOCK_RBITS | __RTLD_MRLOCK_WWAIT)) \
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== (__RTLD_MRLOCK_INC | __RTLD_MRLOCK_WWAIT), 0)) \
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/* We have to wake all threads since there might be some queued \
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readers already. */ \
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lll_futex_wake (&(lock), 0x7fffffff); \
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} while (0)
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/* There can only ever be one thread trying to get the exclusive lock. */
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#define __rtld_mrlock_change(lock) \
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do { \
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__label__ out; \
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while (1) \
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{ \
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int oldval; \
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for (int tries = 0; tries < __RTLD_MRLOCK_TRIES; ++tries) \
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{ \
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oldval = lock; \
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while (__builtin_expect ((oldval & __RTLD_MRLOCK_RBITS) == 0, 1)) \
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{ \
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int newval = ((oldval & __RTLD_MRLOCK_RWAIT) \
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+ __RTLD_MRLOCK_WRITER); \
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int ret = atomic_compare_and_exchange_val_acq (&(lock), \
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newval, \
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oldval); \
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if (__builtin_expect (ret == oldval, 1)) \
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goto out; \
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} \
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atomic_delay (); \
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} \
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atomic_or (&(lock), __RTLD_MRLOCK_WWAIT); \
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oldval |= __RTLD_MRLOCK_WWAIT; \
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lll_futex_wait (lock, oldval); \
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} \
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out:; \
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} while (0)
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#define __rtld_mrlock_done(lock) \
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do { \
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int oldval = atomic_exchange_and_add (&(lock), -__RTLD_MRLOCK_WRITER); \
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if (__builtin_expect ((oldval & __RTLD_MRLOCK_RWAIT) != 0, 0)) \
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lll_futex_wake (&(lock), 0x7fffffff); \
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} while (0)
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/* Function to wait for variable become zero. Used in ld.so for
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reference counters. */
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#define __rtld_waitzero(word) \
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do { \
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while (1) \
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{ \
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int val = word; \
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if (val == 0) \
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break; \
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lll_futex_wait (&(word), val); \
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} \
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} while (0)
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#define __rtld_notify(word) \
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lll_futex_wake (&(word), 1)
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#endif
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