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qemu/util
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Robert Foley 7606488c0e Add use of RCU for qemu_logfile. 
This now allows changing the logfile while logging is active,
and also solves the issue of a seg fault while changing the logfile.

Any read access to the qemu_logfile handle will use
the rcu_read_lock()/unlock() around the use of the handle.
To fetch the handle we will use atomic_rcu_read().
We also in many cases do a check for validity of the
logfile handle before using it to deal with the case where the
file is closed and set to NULL.

The cases where we write to the qemu_logfile will use atomic_rcu_set().
Writers will also use call_rcu() with a newly added qemu_logfile_free
function for freeing/closing when readers have finished.

Signed-off-by: Robert Foley <robert.foley@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20191118211528.3221-6-robert.foley@linaro.org>
 		2019-12-18 20:18:02 +00:00
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Makefile.objs util: introduce SharedResource 2019-10-28 11:22:31 +01:00
aio-posix.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
aio-wait.c
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aio-win32.c
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aiocb.c
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async.c util/async: avoid useless cast 2019-10-24 19:26:05 +02:00
atomic64.c
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base64.c
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bitmap.c bitmap: Add bitmap_copy_with_{src|dst}_offset() 2019-07-15 15:39:02 +02:00
bitops.c
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buffer.c
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bufferiszero.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
cacheinfo.c Fix cacheline detection on FreeBSD/powerpc. 2019-09-19 14:42:13 +02:00
compatfd.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
coroutine-sigaltstack.c
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coroutine-ucontext.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
coroutine-win32.c
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crc32c.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
cutils.c Memory: Enable writeback for given memory region 2019-12-16 10:46:35 +00:00
drm.c
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envlist.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
error.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
event_notifier-posix.c event_notifier: avoid dandling file descriptor in event_notifier_cleanup 2019-10-24 19:26:52 +02:00
event_notifier-win32.c
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fifo8.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
filemonitor-inotify.c filemon: fix watch IDs to avoid potential wraparound issues 2019-04-02 13:52:02 +01:00
filemonitor-stub.c filemon: fix watch IDs to avoid potential wraparound issues 2019-04-02 13:52:02 +01:00
getauxval.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
guest-random.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
hbitmap.c hbitmap: handle set/reset with zero length 2019-10-28 11:22:30 +01:00
hexdump.c
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host-utils.c
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id.c qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h 2019-06-11 20:22:09 +02:00
iov.c util/ioc.c: try to reassure Coverity about qemu_iovec_init_extended 2019-10-08 14:27:35 +01:00
iova-tree.c
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keyval.c
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lockcnt.c
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log.c Add use of RCU for qemu_logfile. 2019-12-18 20:18:02 +00:00
main-loop.c Do not use %m in common code to print error messages 2019-10-22 09:38:42 +02:00
memfd.c linux-user: add memfd_create 2019-09-11 08:46:17 +02:00
mmap-alloc.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00
module.c module: return success on module load 2019-08-21 16:29:57 +02:00
notify.c xen / notify: introduce a new XenWatchList abstraction 2019-09-24 12:18:47 +01:00
osdep.c
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oslib-posix.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00
oslib-win32.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00
pagesize.c
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path.c util/path: Do not cache all filenames at startup 2019-06-24 22:19:30 +02:00
qdist.c
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qemu-co-shared-resource.c util: introduce SharedResource 2019-10-28 11:22:31 +01:00
qemu-config.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-coroutine-io.c yield_until_fd_readable: make it work with any AioContect 2019-10-25 14:38:29 +02:00
qemu-coroutine-lock.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-coroutine-sleep.c qemu-coroutine-sleep: Silence Coverity warning 2019-11-18 16:01:34 -06:00
qemu-coroutine.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-error.c monitor error: Make printf()-like functions return a value 2019-04-18 22:18:59 +02:00
qemu-openpty.c
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qemu-option.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qemu-print.c qemu-print: New qemu_fprintf(), qemu_vfprintf() 2019-04-18 22:18:59 +02:00
qemu-progress.c
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qemu-sockets.c util/qemu-sockets: fix keep_alive handling in inet_connect_saddr 2019-09-25 08:15:44 -05:00
qemu-thread-common.h
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qemu-thread-posix.c qemu-thread: Add qemu_cond_timedwait 2019-09-16 17:13:06 +02:00
qemu-thread-win32.c qemu-thread: Add qemu_cond_timedwait 2019-09-16 17:13:06 +02:00
qemu-timer-common.c
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qemu-timer.c qemu-timer: reuse MIN macro in qemu_timeout_ns_to_ms 2019-10-24 20:10:18 +02:00
qht.c
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qsp.c qemu-thread: Add qemu_cond_timedwait 2019-09-16 17:13:06 +02:00
range.c
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rcu.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
readline.c qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h 2019-06-11 20:22:09 +02:00
stats64.c
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sys_membarrier.c
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systemd.c Do not use %m in common code to print error messages 2019-10-22 09:38:42 +02:00
thread-pool.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
throttle.c
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timed-average.c
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trace-events socket: Add backlog parameter to socket_listen 2019-09-03 23:24:42 +02:00
unicode.c
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uri.c
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uuid.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
vfio-helpers.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00