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bind9/lib/isc/Makefile.am
Tony Finch 9b7aa536ba QSBR: safe memory reclamation for lock-free data structures 
This "quiescent state based reclamation" module provides support for
the qp-trie module in dns/qp. It is a replacement for liburcu, written
without reference to the urcu source code, and in fact it works in a
significantly different way.

A few specifics of BIND make this variant of QSBR somewhat simpler:

  * We can require that wait-free access to a qp-trie only happens in
    an isc_loop callback. The loop provides a natural quiescent state,
    after the callbacks are done, when no qp-trie access occurs.

  * We can dispense with any API like rcu_synchronize(). In practice,
    it takes far too long to wait for a grace period to elapse for each
    write to a data structure.

  * We use the idea of "phases" (aka epochs or eras) from EBR to
    reduce the amount of bookkeeping needed to track memory that is no
    longer needed, knowing that the qp-trie does most of that work
    already.

I considered hazard pointers for safe memory reclamation. They have
more read-side overhead (updating the hazard pointers) and it wasn't
clear to me how to nicely schedule the cleanup work. Another
alternative, epoch-based reclamation, is designed for fine-grained
lock-free updates, so it needs some rethinking to work well with the
heavily read-biased design of the qp-trie. QSBR has the fastest read
side of the basic SMR algorithms (with no barriers), and fits well
into a libuv loop. More recent hybrid SMR algorithms do not appear to
have enough benefits to justify the extra complexity.
2023-02-23 15:57:53 +00:00

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Makefile
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include $(top_srcdir)/Makefile.top
lib_LTLIBRARIES = libisc.la
libisc_ladir = $(includedir)/isc
libisc_la_HEADERS = \
include/isc/aes.h \
include/isc/align.h \
include/isc/ascii.h \
include/isc/assertions.h \
include/isc/async.h \
include/isc/atomic.h \
include/isc/attributes.h \
include/isc/backtrace.h \
include/isc/barrier.h \
include/isc/base32.h \
include/isc/base64.h \
include/isc/buffer.h \
include/isc/cmocka.h \
include/isc/commandline.h \
include/isc/condition.h \
include/isc/counter.h \
include/isc/crc64.h \
include/isc/dir.h \
include/isc/dnsstream.h \
include/isc/endian.h \
include/isc/entropy.h \
include/isc/errno.h \
include/isc/error.h \
include/isc/file.h \
include/isc/formatcheck.h \
include/isc/fsaccess.h \
include/isc/fuzz.h \
include/isc/getaddresses.h \
include/isc/hash.h \
include/isc/hashmap.h \
include/isc/heap.h \
include/isc/hex.h \
include/isc/hmac.h \
include/isc/ht.h \
include/isc/httpd.h \
include/isc/interfaceiter.h \
include/isc/iterated_hash.h \
include/isc/job.h \
include/isc/lang.h \
include/isc/lex.h \
include/isc/list.h \
include/isc/log.h \
include/isc/loop.h \
include/isc/magic.h \
include/isc/managers.h \
include/isc/md.h \
include/isc/mem.h \
include/isc/meminfo.h \
include/isc/mutex.h \
include/isc/mutexblock.h \
include/isc/net.h \
include/isc/netaddr.h \
include/isc/netmgr.h \
include/isc/netscope.h \
include/isc/nonce.h \
include/isc/once.h \
include/isc/os.h \
include/isc/parseint.h \
include/isc/pause.h \
include/isc/portset.h \
include/isc/quota.h \
include/isc/qsbr.h \
include/isc/radix.h \
include/isc/random.h \
include/isc/ratelimiter.h \
include/isc/refcount.h \
include/isc/regex.h \
include/isc/region.h \
include/isc/result.h \
include/isc/rwlock.h \
include/isc/safe.h \
include/isc/serial.h \
include/isc/signal.h \
include/isc/siphash.h \
include/isc/sockaddr.h \
include/isc/stack.h \
include/isc/stats.h \
include/isc/stdio.h \
include/isc/stdtime.h \
include/isc/strerr.h \
include/isc/string.h \
include/isc/symtab.h \
include/isc/syslog.h \
include/isc/thread.h \
include/isc/tid.h \
include/isc/time.h \
include/isc/timer.h \
include/isc/tls.h \
include/isc/tm.h \
include/isc/types.h \
include/isc/url.h \
include/isc/utf8.h \
include/isc/util.h \
include/isc/uv.h \
include/isc/xml.h \
include/isc/work.h
libisc_la_SOURCES = \
$(libisc_la_HEADERS) \
netmgr/netmgr-int.h \
netmgr/netmgr.c \
netmgr/socket.c \
netmgr/streamdns.c \
netmgr/tcp.c \
netmgr/timer.c \
netmgr/tlsstream.c \
netmgr/udp.c \
aes.c \
ascii.c \
assertions.c \
async.c \
backtrace.c \
base32.c \
base64.c \
commandline.c \
condition.c \
counter.c \
crc64.c \
dir.c \
entropy.c \
errno.c \
errno2result.c \
errno2result.h \
error.c \
file.c \
fsaccess.c \
fsaccess_common.c \
fsaccess_common_p.h \
getaddresses.c \
hash.c \
hashmap.c \
heap.c \
hex.c \
hmac.c \
ht.c \
httpd.c \
interfaceiter.c \
iterated_hash.c \
jemalloc_shim.h \
job.c \
job_p.h \
lex.c \
lib.c \
log.c \
loop.c \
loop_p.h \
managers.c \
md.c \
mem.c \
mem_p.h \
meminfo.c \
mutex.c \
mutex_p.h \
mutexblock.c \
net.c \
netaddr.c \
netscope.c \
nonce.c \
openssl_shim.c \
openssl_shim.h \
os.c \
os_p.h \
parseint.c \
picohttpparser.c \
picohttpparser.h \
portset.c \
quota.c \
qsbr.c \
radix.c \
random.c \
random_p.h \
ratelimiter.c \
regex.c \
region.c \
result.c \
safe.c \
serial.c \
signal.c \
siphash.c \
sockaddr.c \
stats.c \
stdio.c \
stdtime.c \
string.c \
symtab.c \
syslog.c \
thread.c \
tid.c \
time.c \
timer.c \
tls.c \
tm.c \
trampoline.c \
trampoline_p.h \
url.c \
utf8.c \
uv.c \
xml.c \
work.c
if USE_ISC_RWLOCK
libisc_la_SOURCES += \
rwlock.c
endif USE_ISC_RWLOCK
libisc_la_CPPFLAGS = \
$(AM_CPPFLAGS) \
$(LIBISC_CFLAGS) \
$(LIBUV_CFLAGS) \
$(OPENSSL_CFLAGS) \
$(ZLIB_CFLAGS)
libisc_la_LDFLAGS = \
$(AM_LDFLAGS) \
-release "$(PACKAGE_VERSION)"
libisc_la_LIBADD = \
$(LIBUV_LIBS) \
$(OPENSSL_LIBS) \
$(ZLIB_LIBS)
if HAVE_JEMALLOC
libisc_la_CPPFLAGS += \
$(JEMALLOC_CFLAGS)
libisc_la_LIBADD += \
$(JEMALLOC_LIBS)
endif HAVE_JEMALLOC
if HAVE_JSON_C
libisc_la_CPPFLAGS += \
$(JSON_C_CFLAGS)
libisc_la_LIBADD += \
$(JSON_C_LIBS)
endif HAVE_JSON_C
if HAVE_LIBNGHTTP2
libisc_la_SOURCES += \
netmgr/http.c
libisc_la_CPPFLAGS += \
$(LIBNGHTTP2_CFLAGS)
libisc_la_LIBADD += \
$(LIBNGHTTP2_LIBS)
endif
if HAVE_LIBXML2
libisc_la_CPPFLAGS += \
$(LIBXML2_CFLAGS)
libisc_la_LIBADD += \
$(LIBXML2_LIBS)
endif HAVE_LIBXML2
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