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Ondřej Surý 14641573da Use sequentially consistent ordering in the adaptive rwlock handshake 
The adaptive isc_rwlock (the modified C-RW-WP variant) synchronizes a
reader against a writer through a store-buffer handshake across two
independent atomic objects: the reader publishes its arrival in
readers_ingress and then reads writers_lock, while the writer publishes
its lock in writers_lock and then reads the reader indicator. With the
acquire/release ordering introduced by the 2021 simplification, neither
side is forced to observe the other's publish store before its own check
load, so on weak-memory targets a reader could see writers_lock unlocked
while the writer sees the indicator empty, and both would enter their
critical sections at once.

Restore the sequentially consistent ordering the original algorithm
specifies on the handshake atomics. The single total order over the
seq_cst operations is what forbids the overlap; targeting individual
fences is both more fragile and, on x86, more expensive. On x86 this
ordering is free (seq_cst loads remain plain loads and the RMWs remain
lock-prefixed); the added cost falls only on the weak-memory targets that
actually need it.

(cherry picked from commit b11bf7a45e)
2026-06-08 15:56:13 +00:00
..
include Add "warn_unused_result" to attributes.h 2026-06-04 09:49:41 -07:00
netmgr Fix spelling typos in comments and code 2026-06-01 15:04:31 +00:00
.gitignore Add support for User Statically Defined Tracing (USDT) probes 2023-08-21 18:39:53 +02:00
ascii.c Consolidate some ASCII tables in isc/ascii and isc/hex 2022-09-12 12:18:57 +01:00
assertions.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
async.c Cleanup the __tsan_acquire/__tsan_release 2023-07-28 08:59:08 +02:00
async_p.h Change the isc_async API to use cds_wfcqueue internally 2023-05-12 14:16:25 +02:00
backtrace.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
base32.c standardize CHECK and RETERR macros 2025-12-03 19:17:20 -08:00
base64.c Add enum for use with isc_base64_tobuffer and isc_hex_tobuffer 2026-01-28 08:02:00 +11:00
commandline.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
condition.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
counter.c Implement global limit for outgoing queries 2024-12-06 06:20:33 +00:00
crc64.c Update the copyright information in all files in the repository 2022-01-11 09:05:02 +01:00
dir.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
errno.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
errno2result.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
errno2result.h Update the copyright information in all files in the repository 2022-01-11 09:05:02 +01:00
error.c Remove do-nothing header <isc/print.h> 2023-02-15 16:44:47 +00:00
file.c Use const pointer with strchr of const pointer 2026-01-20 06:00:50 +00:00
fips.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
getaddresses.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
hash.c Use arc4random for CSPRNG when available 2025-10-02 13:49:33 +02:00
hashmap.c Use arc4random for CSPRNG when available 2025-10-02 13:49:33 +02:00
heap.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
helper.c Add isc_helper API that adds 1:1 thread for each loop 2024-09-12 14:39:07 +00:00
hex.c Add enum for use with isc_base64_tobuffer and isc_hex_tobuffer 2026-01-28 08:02:00 +11:00
histo.c Fix spelling typos in comments and code 2026-06-01 15:04:31 +00:00
hmac.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
ht.c Fix spelling typos in comments and code 2026-06-01 15:04:31 +00:00
httpd.c Clear errno before calling strtol 2026-03-17 00:28:07 +00:00
interfaceiter.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
iterated_hash.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
jemalloc_shim.h Provide more information when the memory allocation fails 2025-11-28 16:45:08 +01:00
job.c Add tracing probes to the isc_job unit 2023-08-21 18:39:53 +02:00
job_p.h Use proper padding instead of using alignas() 2024-02-08 10:54:35 +01:00
lex.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
lib.c Implement incremental version of isc_hash32 and isc_hash64 2023-09-12 16:17:06 +02:00
log.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
loop.c mark loop as shuttingdown earlier in shutdown_cb 2024-12-10 19:52:13 +00:00
loop_p.h Add isc_helper API that adds 1:1 thread for each loop 2024-09-12 14:39:07 +00:00
Makefile.am Use arc4random for CSPRNG when available 2025-10-02 13:49:33 +02:00
managers.c Set name for all the isc_mem context 2025-05-29 05:45:12 +02:00
md.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
mem.c Make isc_mem_isovermem() probabilistic 2026-05-07 13:09:18 +02:00
mem_p.h Update the copyright information in all files in the repository 2022-01-11 09:05:02 +01:00
meminfo.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
mutex.c Fix PTHREAD_MUTEX_ADAPTIVE_NP and PTHREAD_MUTEX_ERRORCHECK_NP usage 2024-08-05 09:13:07 +00:00
mutex_p.h Use library constructor to create default mutex attr once 2022-07-13 13:19:32 +02:00
mutexblock.c Update the copyright information in all files in the repository 2022-01-11 09:05:02 +01:00
net.c Rename isc_net_getudpportrange() to isc_net_getportrange() 2026-02-20 17:02:45 +01:00
netaddr.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
netscope.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
openssl_shim.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
openssl_shim.h Remove unused <openssl/{hmac,engine}.h> headers from OpenSSL shims 2024-10-16 04:39:43 +00:00
os.c Implement IP_LOCAL_PORT_RANGE socket option for Linux 2026-02-20 17:02:45 +01:00
os_p.h Update the copyright information in all files in the repository 2022-01-11 09:05:02 +01:00
parseint.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
picohttpparser.c Fix spelling typos in comments and code 2026-06-01 15:04:31 +00:00
picohttpparser.h Update picohttpparser.{c,h} with upstream repository 2024-12-08 12:30:07 +00:00
portset.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
probes.d Add tracing probes to the isc_job unit 2023-08-21 18:39:53 +02:00
proxy2.c Use clang-format-20 to update formatting 2025-06-25 13:32:08 +10:00
quota.c Fix isc_quota bug 2025-02-20 12:20:25 +00:00
radix.c Fix INSIST copy-paste error checking RADIX_V4 instead of RADIX_V6 2026-03-30 19:01:29 +02:00
random.c Drop the unit test for testing randomness 2025-11-04 20:51:22 +01:00
ratelimiter.c Dispatch ratelimiter events under the lock 2026-04-30 10:53:49 +02:00
regex.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
region.c Incrementally apply AXFR transfer 2024-11-26 07:17:06 +00:00
result.c Switch UDP fetches to TCP on the first response with a wrong query id 2026-05-15 08:49:19 +02:00
rwlock.c Use sequentially consistent ordering in the adaptive rwlock handshake 2026-06-08 15:56:13 +00:00
safe.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
serial.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
signal.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
sockaddr.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
stats.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
stdio.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
stdtime.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
string.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
symtab.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
syslog.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
tests Move all the unit tests to /tests/<libname>/ 2022-05-28 14:53:02 -07:00
thread.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
tid.c Only update the global tid_count once 2026-06-04 12:50:57 +02:00
time.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
timer.c Add isc_timer_running() function to check status of timer 2025-02-21 22:27:25 +01:00
tls.c Remove OpenSSL memory tracking support from the tls.c module 2026-05-06 13:57:52 +00:00
tm.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
url.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
utf8.c Remove redundant parentheses from the return statement 2024-11-19 14:26:52 +01:00
uv.c ensure file descriptors 0-2 are in use before using libuv 2025-08-28 08:57:12 +00:00
work.c Enforce isc_work enqueue loop affinity 2026-03-14 07:52:56 +01:00
xml.c Disable own memory context for libxml2 on macOS 15.4 Sequoia 2025-04-18 21:00:52 +02:00