Commit Graph

344 Commits

Author SHA1 Message Date
Ulrich Drepper
76a67697c8 Update.
* sysdeps/pthread/pthread.h: Don't mark pthread_testcancel,
	pthread_cancel, pthread_setcancelstate, and pthread_setcanceltype with
2003-04-18 08:08:11 +00:00
Ulrich Drepper
7d74651eb0 Update.
2003-04-18  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/pthread/pthread.h: Don't mark pthread_testcancel with
	__THROW.
2003-04-18 08:01:53 +00:00
Jakub Jelinek
dd9d65384e * tst-cancel4.c (do_test): Use %zd instead of %d when printing cnt. 2003-04-16 21:59:43 +00:00
Roland McGrath
4ab6f47ce3 * libio/fileops.c (_IO_file_close_it): Macro tweak to avoid warning.
* sysdeps/generic/libc-start.c [NEED_DL_SYSINFO]: Add decl for
	INTUSE(__register_frame_info_bases).
2003-04-16 03:12:34 +00:00
Ulrich Drepper
162434a682 Update.
2003-04-15  Ulrich Drepper  <drepper@redhat.com>

	* elf/elf.h: Define AT_SYSINFO_EH_FRAME.
	* sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Handle
	AT_SYSINFO_EH_FRAME.
	(_dl_show_auxv):Display AT_SYSINFO_EH_FRAME value.
	* sysdeps/generic/ldsodefs.h [NEED_DL_SYSINFO] (struct rtld_global):
	Add _dl_sysinfo_eh_frame field.
	* elf/dl-support.c [NEED_DL_SYSINFO]: Define _dl_sysinfo_eh_frame.
	* sysdeps/generic/libc-start.c [NEED_DL_SYSINFO] Define eh_obj
	variable.
	[NEED_DL_SYSINFO] (LIBC_START_MAIN): Call __register_frame_info_bases
	if _dl_sysinfo_eh_frame is non-NULL.

	* Makeconfig (gnulib): Add -lgcc_eh.

	* config.h.in: Define HAVE_FORCED_UNWIND.
2003-04-15 22:46:40 +00:00
Ulrich Drepper
18ddd3aa66 Update.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: Don't
2003-04-14 21:55:10 +00:00
Ulrich Drepper
359091616d Update.
2003-04-14  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Don't
	overflow CFA advance instructions.
	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S: Likewise.
2003-04-14 21:38:45 +00:00
Ulrich Drepper
bd4f43b462 Update.
2003-04-14  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/i386/i486/bits/atomic.h: Rename LOCK to LOCK_PREFIX.
	* sysdeps/x86_64/bits/atomic.h: Likewise.

2003-04-14  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/sysdep.h: Change PUSHARGS_1 and
	POPARGS_1 to emit labels for the mov instructions.

2003-04-14  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h (ret_NOERRNO): Define.
2003-04-14 17:30:34 +00:00
Ulrich Drepper
18a8e730da Update.
2003-04-14  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S: Use
	DW_CFA_advance_loc2 for .Laddl-.Lsubl.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Use
	DW_CFA_advance_loc for .Laddl-.Lsubl.

	* sysdeps/unix/sysv/linux/i386/sysdep-cancel.h: Don't use
	position-independent unwind data for static libraries.
	Add missing unwind info.  Add comments.
2003-04-14 16:43:20 +00:00
Ulrich Drepper
ad2be8527a Update.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S: Add unwind info.
	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S: Likewise.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Likewise.
2003-04-13 08:36:19 +00:00
Ulrich Drepper
08c765fa6e Update.
2003-04-13  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S: Add
	unwind info.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S: Likewise.

	* Makefile: Make sure all cancellation points are compiled with
	exception and asynchronous unwind tables.
2003-04-13 08:04:46 +00:00
Ulrich Drepper
177d1ad3ac Update.
2003-04-12  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/x86_64/tls.h (THREAD_SETMEM): Word around compiler bug
	which mishandles loading of global object addresses in PIC.
	(THREAD_SETMEM_NC): Likewise.
2003-04-12 20:32:01 +00:00
Ulrich Drepper
68107ec092 Update.
* sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h: Likewise.
2003-04-12 08:38:14 +00:00
Ulrich Drepper
09d65ff393 Update.
2003-04-11  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/generic/libc-start.c: Cleanup MAIN_AUXVEC_ARG handling.
	Remove HAVE_CANCELBUF code.  Replace with code using the new
	initializers for unwind-based cleanup handling.
	* sysdeps/generic/unwind.h: Update from latest gcc version.
	* sysdeps/unix/sysv/linux/i386/sysdep.h: Define labels in a few
	places to allow unwind data generation.
	* sysdeps/i386/bits/setjmp.h: Allow file to be included multiple times.
	* sysdeps/x86_64/bits/setjmp.h: Likewise.
	* sysdeps/sh/bits/setjmp.h: Likewise.
	* sysdeps/powerpc/bits/setjmp.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/bits/setjmp.h: Likewise.
	* sysdeps/alpha/bits/setjmp.h: Likewise.
2003-04-12 00:58:26 +00:00
Roland McGrath
0dc44b51cd * csu/tst-empty.c: New file.
* csu/Makefile (tests, tests-static): Add it.
2003-04-12 00:17:14 +00:00
Ulrich Drepper
84a80719cc Update.
2003-04-11  Ulrich Drepper  <drepper@redhat.com>

	* tst-attr2.c (do_test): Add cast to avoid warning.
	* tst-mutex4.c (do_test): Likewise.
2003-04-11 23:00:57 +00:00
Ulrich Drepper
88ff4759ac Update.
2003-04-10  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/fork.c (__libc_fork): Reset CPU clocks
	in child.
2003-04-10 16:46:27 +00:00
Ulrich Drepper
b2041097f6 Update.
2003-04-09  Ulrich Drepper  <drepper@redhat.com>

	* Makefile (tests): Add tst-detach1.
	* tst-detach1.c: New file.
2003-04-09 14:40:34 +00:00
Ulrich Drepper
9afe496416 Update.
* sysdeps/pthread/pthread.h: Remove duplicate
	pthread_cleanup_{push,pop} definitions.
2003-04-08 20:24:21 +00:00
Ulrich Drepper
f9657e88fa Update.
2003-04-08  Ulrich Drepper  <drepper@redhat.com>

	* tst-barrier2.c: Eliminate warnings.
	* tst-cancel4.c: Likewise.
	* tst-cond4.c: Likewise.
	* tst-cond6.c: Likewise.
	* tst-detach1.c: Likewise.
	* tst-rwlock4.c: Likewise.
	* tst-rwlock6.c: Likewise.
	* tst-rwlock7.c: Likewise.
	* tst-sem3.c: Likewise.
	* tst-spin2.c: Likewise.
	* tst-umask1.c: Likewise.
2003-04-08 18:23:59 +00:00
Ulrich Drepper
69b35e862f Update.
2003-04-07  Ulrich Drepper  <drepper@redhat.com>

	* pthread_detach.c (pthread_detach): Fix test for invalid TID.
2003-04-07 21:09:12 +00:00
Ulrich Drepper
c70ad7d71e Update.
2003-04-06  Ulrich Drepper  <drepper@redhat.com>

	* descr.h (struct pthread): Move cancelhandling member to the front.
2003-04-06 09:28:48 +00:00
Ulrich Drepper
54e0138f7f Update.
2003-04-05  Ulrich Drepper  <drepper@redhat.com>

	* malloc/thread-m.h [PTHREAD_MUTEX_INITIALIZER]: If
	HAVE_register_atfork_malloc is defined use __register_atfork_malloc
	instead of __register_atfork.
2003-04-05 09:36:56 +00:00
Ulrich Drepper
b22d701bb7 Update.
2003-04-04  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/pthread/createthread.c (create_thread): Add some more
	comments explaining when to set multiple_threads and when not.

	* pthreadP.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
	THREAD_ATOMIC_BIT_SET if not already defined.
	* sysdeps/i386/tls.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
	THREAD_ATOMIC_BIT_SET:
	* sysdeps/x86_64/tls.h: Likewise.
	* cleanup_defer.c (_pthread_cleanup_push_defer): Rewrite to use
	THREAD_ATOMIC_CMPXCHG_VAL.
	(_pthread_cleanup_pop_restore): Likewise.
	* cancellation.c (__pthread_enable_asynccancel): Likewise.
	(__pthread_enable_asynccancel_2): Likewise.
	(__pthread_disable_asynccancel): Likewise.
	* libc-cancellation.c (__libc_enable_asynccancel): Likewise.
	(__libc_disable_asynccancel): Likewise.
	* init.c (sigcancel_handler): Likewise.
	* pthread_setcancelstate.c (__pthread_setcancelstate): Likewise.
	* pthread_setcanceltype.c (__pthread_setcanceltype): Likewise.
2003-04-05 05:21:15 +00:00
Ulrich Drepper
86246935da Update.
2003-04-03  Ulrich Drepper  <drepper@redhat.com>

	* init.c (sigcancel_handler): Don't set EXITING_BIT here.
	* libc-cancellation.c (__libc_enable_asynccancel): Likewise.
	* pthreadP.h (__do_cancel): Set EXITING_BIT here.
	* Makefile (tests): Add tst-cancel11.
	* tst-cancel11.c: New file.
2003-04-04 07:59:55 +00:00
Ulrich Drepper
fd722fba2f Update. 2003-04-02 04:57:59 +00:00
Ulrich Drepper
0d73a73b4b Update.
* Makefile (tests): Add tst-tsd3.c and tst-tsd4.
	* tst-tsd4.c: New file.
2003-04-02 04:02:00 +00:00
Ulrich Drepper
6b4686a534 Update.
2003-04-01  Ulrich Drepper  <drepper@redhat.com>

	* pthread_create.c (deallocate_tsd): Clear/free memory after the last
	round, not the first.  Use specific_used flag instead of local
	found_nonzero variable.  Use THREAD_[SG]ETMEM where possible.
	(__free_tcb): Don't call deallocate_tsd here.
	(start_thread): Call deallocate_tsd here.
	* pthread_setspecific.c: Set specific_used flag really only when
	needed.
	* Makefile (tests): Add tst-tsd3.c
	* tst-tsd3.c: New file.
2003-04-02 03:51:24 +00:00
Ulrich Drepper
211d90c524 Update.
* sysdeps/unix/sysv/linux/ia64/lowlevellock.h (__lll_mutex_lock):
	Use atomic_exchange_and_add instead of __lll_add.
	(__lll_mutex_timedlock): Likewise.
	Patch by Ian Wienand.

2003-03-24  Steven Munroe  <sjmunroe@us.ibm.com>

	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h
	(SINGLE_THREAD_P): Fix typo.
	* tst-cancel-wrappers.sh: Handle '.'ed symbols.

2003-03-31  Ulrich Drepper  <drepper@redhat.com>

	* Makefile (tests): Add tst-align.
	* tst-align.c: New file.
	* sysdeps/i386/Makefile: Define CFLAGS-tst-align.
	* sysdeps/x86_64/Makefile: Likewise.

	* tst-tsd2.c: Add casts to avoid warnings.
2003-04-01 01:24:00 +00:00
Ulrich Drepper
42b2395dce Update.
2003-03-31  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/i386/tls.h (CALL_THREAD_FCT): Align stack of called
	function correctly.
2003-04-01 00:55:22 +00:00
Ulrich Drepper
163b180f5c Update.
2003-03-30  Ulrich Drepper  <drepper@redhat.com>

	* descr.h (struct pthread): Move most often used elements to the front.
2003-03-30 19:46:44 +00:00
Ulrich Drepper
ea473bad4c Update.
2003-03-29  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/ifaddrs.c (getifaddrs): Avoid
	netlink_open calls if netlink is known to not be available.
2003-03-29 09:24:03 +00:00
Ulrich Drepper
dd731d53dc Update.
2003-03-28  Kaz Kojima  <kkojima@rr.iij4u.or.jp>

	* sysdeps/sh/bits/atomic.h (__arch_compare_and_exchange_val_8_acq):
	Return old value. Make asm output reg constraint earlyclobber.
	Renamed from...
	(__arch_compare_and_exchange_8_acq): ... this.
	(__arch_compare_and_exchange_val_16_acq):
	Return old value. Make asm output reg constraint earlyclobber.
	Renamed from...
	(__arch_compare_and_exchange_16_acq): ... this.
	(__arch_compare_and_exchange_val_32_acq):
	Return old value. Make asm output reg constraint earlyclobber.
	Renamed from...
	(__arch_compare_and_exchange_32_acq): ... this.
	(__arch_compare_and_exchange_val_64_acq):
	Renamed from...
	(__arch_compare_and_exchange_64_acq): ... this.
	(atomic_exchange_and_add): Use local variables and
	__arch_compare_and_exchange_val_64_acq.
	(atomic_add): Likewise.
	(atomic_add_negative, atomic_add_zero): Use local variables.

	* Makefile: Remove libmd5crypt goal.
2003-03-29 01:24:20 +00:00
Ulrich Drepper
5f5004df21 Update.
* sysdeps/unix/sysv/linux/kernel-posix-timers.h: Don't declare
	__timer_helper_thread.  Declare __start_helper_thread, __helper_once,
	and __helper_tid.
	(struct timer): Remove th and bar field.
	* sysdeps/unix/sysv/linux/timer_create.c (timer_create): Remove
	debugging code.  Create only one helper thread.
	* sysdeps/unix/sysv/linux/timer_delete.c (timer_delete): Don't kill
	helper thread.
	* sysdeps/unix/sysv/linux/timer_routines.c (timer_helper_thread):
	Renamed.  Define statically.  Use thread info from siginfo.
	(__helper_once): New variable.
	(__helper_tid): New variable.
	(__reset_helper_control): New function.
	(__start_helper_thread): New function.
2003-03-28 06:27:21 +00:00
Ulrich Drepper
18d009ca00 Update.
* pthread_create.c (start_thread): Don't use setjmp inside
	__builtin_expect to work around gcc bug.
2003-03-27 21:14:41 +00:00
Ulrich Drepper
28cf305854 Update.
2003-03-27  David Mosberger  <davidm@hpl.hp.com>

	* sysdeps/unix/sysv/linux/ia64/getcontext.S: Restore caller's
	ar.unat before returning.  Add missing .mem.offset directives
	to ensure file gets assembled without warnings.
	* sysdeps/unix/sysv/linux/ia64/setjmp.S: Likewise.
2003-03-27 19:51:26 +00:00
Ulrich Drepper
c75d02f056 Update.
2003-03-27  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/timer_delete.c (timer_delete): Even if
	timer_delete syscall fails, but not with ENOSYS, set
	__no_posix_timers.

	* sysdeps/unix/sysv/linux/timer_settime.c [!__ASSUME_POSIX_TIMERS]
	(timer_settime): Fix typo.
2003-03-27 19:10:51 +00:00
Jakub Jelinek
049ac25989 * sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S: Fix
offset of cleanupbuf.__prev.
2003-03-27 12:43:17 +00:00
Jakub Jelinek
f93d39dd07 * sysdeps/unix/sysv/linux/timer_getoverr.c: Fix typo in name
of included file.
2003-03-26 15:33:23 +00:00
Ulrich Drepper
f064e4c5d7 Update.
2003-03-26  Ulrich Drepper  <drepper@redhat.com>

	* abilist/librt.abilist: Add new timer interfaces for 64-bit archs.
2003-03-26 09:41:23 +00:00
Roland McGrath
83e886a32a * sysdeps/pthread/posix-timer.h (TIMER_MAX): Define if not defined.
(timer_id2ptr): Fix typo.
2003-03-26 08:06:59 +00:00
Ulrich Drepper
09402f5bc1 Update.
2003-03-25  Ulrich Drepper  <drepper@redhat.com>

	* csu/tst-atomic.c: Adjust tests to what atomic_add_negative and
	atomic_add_zero were supposed to do.
	* include/atomic.h: Adjust atomic_add_negative and atomic_add_zero
	to x86 behavior.

	* sysdeps/generic/bits/typesizes.h (__TIMER_T_TYPE): Define as void*.
	This matches the new timer implementation.
	* sysdeps/unix/sysv/linux/bits/siginfo.h (struct siginfo): Adjust
	timer info for what the kernel provides these days.
	(struct sigevent): Add _tid field.
	Define SIGEV_THREAD_ID.

	* Versions.def (librt): Add GLIBC_2.3.3.

	* abilist/libpthread.abilist: Update for nptl.
2003-03-25 20:41:26 +00:00
Ulrich Drepper
5e826ab537 Update.
2003-03-24  Jon Grimm  <jgrimm@us.ibm.com>

	* inet/netinet/in.h: Add IPPROTO_SCTP.

2003-03-24  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/sys/epoll.h (EPOLLET): Define.
2003-03-25 01:14:36 +00:00
Roland McGrath
3045a1fe89 * Makeconfig (+includes): Don't use $(last-includes). 2003-03-23 11:17:28 +00:00
Roland McGrath
85047fe3b9 * tst-mutex5.c (do_test): Unlock before destroy, otherwise we invoke
undefined behavior.
2003-03-23 10:12:59 +00:00
Roland McGrath
b910f7887b * tst-join5.c (tf1, tf2): Add a cast.
* Makeconfig (includes): Append -I$(..)nptl to this variable.

	* tst-barrier2.c (do_test) [! _POSIX_THREAD_PROCESS_SHARED]:
	Don't test anything.
	* tst-cond4.c: Likewise.
	* tst-cond6.c: Likewise.
	* tst-flock2.c: Likewise.
	* tst-mutex4.c: Likewise.
	* tst-rwlock4.c: Likewise.
	* tst-signal1.c: Likewise.
	* tst-spin2.c: Likewise.
	* tst-cond11.c [! _POSIX_CLOCK_SELECTION]: Likewise.

	* tst-mutex4.c: Use test-skeleton.c.
	* tst-spin2.c: Likewise.
	* tst-sysconf.c: Likewise.
	* tst-barrier2.c: Likewise.
	* tst-cond4.c: Likewise.
	* tst-cond6.c: Likewise.
	* tst-rwlock4.c: Likewise.
	* tst-unload.c: Likewise.
	* tst-flock2.c (do_test): Use return instead of exit.
2003-03-23 10:01:48 +00:00
Roland McGrath
4baa087aff * sysdeps/i386/i486/bits/atomic.h (atomic_bit_set): Use "ir"
constraint to permit non-constant BIT argument.
	(atomic_bit_test_set): Likewise.
	* sysdeps/x86_64/bits/atomic.h (atomic_bit_test_set): Likewise.
	(atomic_bit_set): Likewise.  Use 1UL in case that BIT might be >= 32.
	For quadword case, use "i" constraint if __builtin_constant_p and < 32
	or "r" constraint otherwise.

	* configure.in: Move AC_PROG_CC and other program-finding before all
	the version checks.
	* configure: Regenerated.
2003-03-22 00:07:21 +00:00
Ulrich Drepper
9f07eae298 Update.
2003-03-20  Ulrich Drepper  <drepper@redhat.com>

	* include/atomic.h: Define atomic_compare_and_exchange_val_acq,
	atomic_compare_and_exchange_val_rel,
	atomic_compare_and_exchange_bool_acq, and
	atomic_compare_and_exchange_bool_rel instead of
	atomic_compare_and_exchange_acq and atomic_compare_and_exchange_rel.
	* sysdeps/i386/i486/bits/atomic.h: Define
	__arch_compare_and_exchange_val_*_acq instead of
	__arch_compare_and_exchange_*_acq.
	* sysdeps/x86_64/bits/atomic.h: Likewise.
	* sysdeps/ia64/bits/atomic.h: Define
	__arch_compare_and_exchange_bool_*_acq instead of
	__arch_compare_and_exchange_*_acq.
	* sysdeps/powerpc/bits/atomic.h: Likewise.
	* sysdeps/s390/bits/atomic.h: Likewise.
	* gmon/mcount.c: Adjust for new form of compare&exchange macros.
	* malloc/set-freeres.c: Likewise.
	* nscd/cache.c: Likewise.
	* stdlib/cxa_finalize.c: Likewise.
	* sysdeps/unix/sysv/linux/getsysstats.c: Likewise.
2003-03-21 08:13:51 +00:00
Ulrich Drepper
5a3ab2fc18 Update.
2003-03-21  Ulrich Drepper  <drepper@redhat.com>

	* cancellation.c: Adjust for new form of compare&exchange macros.
	* cleanup_defer.c: Likewise.
	* init.c: Likewise.
	* libc-cancellation.c: Likewise.
	* old_pthread_cond_broadcast.c: Likewise.
	* old_pthread_cond_signal.c: Likewise.
	* old_pthread_cond_timedwait.c: Likewise.
	* old_pthread_cond_wait.c: Likewise.
	* pthread_cancel.c: Likewise.
	* pthread_create.c: Likewise.
	* pthread_detach.c: Likewise.
	* pthread_join.c: Likewise.
	* pthread_key_delete.c: Likewise.
	* pthread_setcancelstate.c: Likewise.
	* pthread_setcanceltype.c: Likewise.
	* pthread_timedjoin.c: Likewise.
	* pthread_tryjoin.c: Likewise.
	* sysdeps/pthread/createthread.c: Likewise.
2003-03-21 08:03:25 +00:00
Ulrich Drepper
b1aea0989d Update.
2003-03-20  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/ia64/lowlevellock.h: Include <atomic.h>.
	Remove __lll_add, __lll_dev_if_positive, and __lll_test_and_set
	definitions.  Replace uses with calls to atomic_* functions.
	* sysdeps/unix/sysv/linux/powerpc/lowlevellock.h: Likewise.
	* sysdeps/unix/sysv/linux/lowlevellock.c: Replace __lll_add and
	__lll_test_and_set calls with atomic_exchange_and_add and
	atomic_exchange calls respectively.
	* sysdeps/unix/sysv/linux/sem_post.c: Likewise.
	* sysdeps/unix/sysv/linux/sem_timedwait.c: Likewise.
	* sysdeps/unix/sysv/linux/sem_trywait.c: Likewise.
	* sysdeps/unix/sysv/linux/sem_wait.c: Likewise.
	* sysdeps/unix/sysv/linux/ia64/pthread_once.c: Likewise.
	* sysdeps/unix/sysv/linux/ia64/sem_port.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/pthread_once.c: Likewise.

	* allocatestack.c (allocate_stack): Assume atomic_exchange_and_add
	returns the old value.
2003-03-20 10:29:20 +00:00