[lttng-dev] [RELEASE] Userspace RCU 0.8.0
Mathieu Desnoyers
mathieu.desnoyers at efficios.com
Fri Sep 6 11:06:22 EDT 2013
liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This
data synchronization library provides read-side access which scales
linearly with the number of cores. It does so by allowing multiples
copies of a given data structure to live at the same time, and by
monitoring the data structure accesses to detect grace periods after
which memory reclamation is possible.
liburcu-cds provides efficient data structures based on RCU and
lock-free algorithms. Those structures include hash tables, queues,
stacks, and doubly-linked lists.
What's new in Userspace RCU 0.8 ?
* Introduce new wait-free concurrent queue API (urcu/wfcqueue.h),
* Introduce new lock-free stack (urcu/lfstack.h),
* Wait-free stack API (urcu/wfstack.h) is extended,
* The old queue API (wfqueue.h) is flagged as deprecated. It will be
kept around for a while, but will emit a compiler warning such as:
warning: ‘cds_wfq_dequeue_blocking’ is deprecated
(declared at /usr/local/include/urcu/wfqueue.h:87) [-Wdeprecated-declarations]
New code should use urcu/wfcqueue.h instead of urcu/wfqueue.h.
* The old RCU lock-free stack urcu/rculfstack.h is replaced by
urcu/lfstack.h. The old API will be kept around for a while, but will
emit a compiler warning. New code should use urcu/lfstack.h.
* Tests are now split into:
tests/unit/ : unit tests
tests/regression/ : regression tests
tests/benchmark/ : benchmarks
* A doc/examples/ directory is added, including API usage examples.
Those are installed into /usr/share/doc/userspace-rcu/examples/ (for
instance, assuming configure had --prefix=/usr).
* Had to bump the library .so version from 1.0.0 to 2.0.0 to fix symbol
namespace clash (see commit 1de4df4b770e5e90440008becc5e14a15c75c6e0:
"Fix static linking: fix symbol name namespaces").
Project website: http://urcu.so
Download link: http://urcu.so/files/
Git repository: git://git.urcu.so/urcu.git
git diff --stat from v0.7.4:
.gitignore | 186 +++--
ChangeLog | 211 ++++++
CodingStyle | 2 +-
LICENSE | 45 +-
Makefile.am | 19 +-
README | 123 +++-
compat_arch_x86.c | 4 +-
config/ax_tls.m4 | 13 +-
configure.ac | 122 ++-
doc/Makefile.am | 2 +
doc/cds-api.txt | 35 +-
doc/examples/Makefile.am | 142 ++++
doc/examples/Makefile.examples.template | 29 +
doc/examples/dist-files/Makefile | 33 +
doc/examples/hlist/Makefile | 25 +
doc/examples/hlist/Makefile.cds_hlist_add_head_rcu | 21 +
doc/examples/hlist/Makefile.cds_hlist_del_rcu | 21 +
.../hlist/Makefile.cds_hlist_for_each_entry_rcu | 21 +
doc/examples/hlist/Makefile.cds_hlist_for_each_rcu | 21 +
doc/examples/hlist/cds_hlist_add_head_rcu.c | 64 ++
doc/examples/hlist/cds_hlist_del_rcu.c | 90 +++
doc/examples/hlist/cds_hlist_for_each_entry_rcu.c | 84 +++
doc/examples/hlist/cds_hlist_for_each_rcu.c | 91 +++
doc/examples/lfstack/Makefile | 23 +
.../lfstack/Makefile.cds_lfs_pop_all_blocking | 21 +
doc/examples/lfstack/Makefile.cds_lfs_pop_blocking | 21 +
doc/examples/lfstack/Makefile.cds_lfs_push | 21 +
doc/examples/lfstack/cds_lfs_pop_all_blocking.c | 79 ++
doc/examples/lfstack/cds_lfs_pop_blocking.c | 75 ++
doc/examples/lfstack/cds_lfs_push.c | 72 ++
doc/examples/list/Makefile | 29 +
doc/examples/list/Makefile.cds_list_add_rcu | 21 +
doc/examples/list/Makefile.cds_list_add_tail_rcu | 21 +
doc/examples/list/Makefile.cds_list_del_rcu | 21 +
.../list/Makefile.cds_list_for_each_entry_rcu | 21 +
doc/examples/list/Makefile.cds_list_for_each_rcu | 21 +
doc/examples/list/Makefile.cds_list_replace_rcu | 21 +
doc/examples/list/cds_list_add_rcu.c | 64 ++
doc/examples/list/cds_list_add_tail_rcu.c | 64 ++
doc/examples/list/cds_list_del_rcu.c | 90 +++
doc/examples/list/cds_list_for_each_entry_rcu.c | 84 +++
doc/examples/list/cds_list_for_each_rcu.c | 90 +++
doc/examples/list/cds_list_replace_rcu.c | 94 +++
doc/examples/rculfhash/Makefile | 31 +
doc/examples/rculfhash/Makefile.cds_lfht_add | 22 +
.../rculfhash/Makefile.cds_lfht_add_replace | 22 +
.../rculfhash/Makefile.cds_lfht_add_unique | 22 +
doc/examples/rculfhash/Makefile.cds_lfht_del | 22 +
doc/examples/rculfhash/Makefile.cds_lfht_destroy | 22 +
.../Makefile.cds_lfht_for_each_entry_duplicate | 22 +
doc/examples/rculfhash/Makefile.cds_lfht_lookup | 22 +
doc/examples/rculfhash/cds_lfht_add.c | 106 +++
doc/examples/rculfhash/cds_lfht_add_replace.c | 147 ++++
doc/examples/rculfhash/cds_lfht_add_unique.c | 144 ++++
doc/examples/rculfhash/cds_lfht_del.c | 168 +++++
doc/examples/rculfhash/cds_lfht_destroy.c | 149 ++++
.../rculfhash/cds_lfht_for_each_entry_duplicate.c | 143 ++++
doc/examples/rculfhash/cds_lfht_lookup.c | 147 ++++
doc/examples/rculfhash/jhash.h | 256 +++++++
doc/examples/rculfqueue/Makefile | 21 +
doc/examples/rculfqueue/Makefile.cds_lfq_dequeue | 21 +
doc/examples/rculfqueue/Makefile.cds_lfq_enqueue | 21 +
doc/examples/rculfqueue/cds_lfq_dequeue.c | 115 +++
doc/examples/rculfqueue/cds_lfq_enqueue.c | 73 ++
doc/examples/urcu-flavors/Makefile | 27 +
doc/examples/urcu-flavors/Makefile.bp | 21 +
doc/examples/urcu-flavors/Makefile.mb | 21 +
doc/examples/urcu-flavors/Makefile.membarrier | 21 +
doc/examples/urcu-flavors/Makefile.qsbr | 21 +
doc/examples/urcu-flavors/Makefile.signal | 21 +
doc/examples/urcu-flavors/bp.c | 115 +++
doc/examples/urcu-flavors/mb.c | 141 ++++
doc/examples/urcu-flavors/membarrier.c | 140 ++++
doc/examples/urcu-flavors/qsbr.c | 149 ++++
doc/examples/urcu-flavors/signal.c | 140 ++++
doc/examples/wfcqueue/Makefile | 23 +
doc/examples/wfcqueue/Makefile.cds_wfcq_dequeue | 21 +
doc/examples/wfcqueue/Makefile.cds_wfcq_enqueue | 21 +
doc/examples/wfcqueue/Makefile.cds_wfcq_splice | 21 +
doc/examples/wfcqueue/cds_wfcq_dequeue.c | 79 ++
doc/examples/wfcqueue/cds_wfcq_enqueue.c | 72 ++
doc/examples/wfcqueue/cds_wfcq_splice.c | 109 +++
doc/examples/wfstack/Makefile | 23 +
doc/examples/wfstack/Makefile.cds_wfs_pop | 21 +
.../wfstack/Makefile.cds_wfs_pop_all_blocking | 21 +
doc/examples/wfstack/Makefile.cds_wfs_push | 21 +
doc/examples/wfstack/cds_wfs_pop.c | 75 ++
doc/examples/wfstack/cds_wfs_pop_all_blocking.c | 79 ++
doc/examples/wfstack/cds_wfs_push.c | 72 ++
doc/rcu-api.txt | 24 +-
lfstack.c | 81 ++
rculfhash.c | 106 ++-
rculfstack.c | 3 +
scripts/urcu-api-list.sh | 233 ++++++
tests/Makefile.am | 199 +----
tests/api.h | 316 --------
tests/benchmark/Makefile.am | 186 +++++
tests/benchmark/common.sh | 12 +
tests/benchmark/runall.sh | 104 +++
tests/benchmark/runhash.sh | 136 ++++
tests/benchmark/runpaul-phase1.sh | 44 ++
tests/benchmark/runpaul-phase2.sh | 47 ++
tests/benchmark/runpaul-phase3.sh | 50 ++
tests/benchmark/runpaul-phase4.sh | 40 +
tests/benchmark/runpaul-phase5.sh | 11 +
tests/benchmark/runpaul-phase6.sh | 7 +
tests/benchmark/runpaul-phase7.sh | 41 ++
tests/benchmark/runtests-batch.sh | 19 +
tests/benchmark/runtests.sh | 21 +
tests/benchmark/subphase4.sh | 101 +++
tests/benchmark/test_cycles_per_loop.c | 44 ++
tests/benchmark/test_looplen.c | 74 ++
tests/benchmark/test_mutex.c | 399 ++++++++++
tests/benchmark/test_perthreadlock.c | 410 +++++++++++
tests/benchmark/test_perthreadlock_timing.c | 198 +++++
tests/benchmark/test_rwlock.c | 391 ++++++++++
tests/benchmark/test_rwlock_timing.c | 183 +++++
tests/benchmark/test_urcu.c | 404 ++++++++++
tests/benchmark/test_urcu_assign.c | 439 +++++++++++
tests/benchmark/test_urcu_bp.c | 399 ++++++++++
tests/benchmark/test_urcu_defer.c | 426 +++++++++++
tests/benchmark/test_urcu_gc.c | 470 ++++++++++++
tests/benchmark/test_urcu_hash.c | 774 ++++++++++++++++++++
tests/benchmark/test_urcu_hash.h | 390 ++++++++++
tests/benchmark/test_urcu_hash_rw.c | 284 +++++++
tests/benchmark/test_urcu_hash_unique.c | 279 +++++++
tests/benchmark/test_urcu_lfq.c | 436 +++++++++++
tests/benchmark/test_urcu_lfs.c | 518 +++++++++++++
tests/benchmark/test_urcu_lfs_rcu.c | 435 +++++++++++
tests/benchmark/test_urcu_qsbr.c | 410 +++++++++++
tests/benchmark/test_urcu_qsbr_gc.c | 470 ++++++++++++
tests/benchmark/test_urcu_qsbr_timing.c | 225 ++++++
tests/benchmark/test_urcu_timing.c | 224 ++++++
tests/benchmark/test_urcu_wfcq.c | 581 +++++++++++++++
tests/benchmark/test_urcu_wfq.c | 401 ++++++++++
tests/benchmark/test_urcu_wfs.c | 565 ++++++++++++++
tests/common/Makefile.am | 3 +
tests/common/api.h | 311 ++++++++
tests/common/cpuset.h | 45 ++
tests/common/thread-id.h | 55 ++
tests/rcutorture.h | 503 -------------
tests/regression/Makefile.am | 75 ++
tests/regression/rcutorture.h | 503 +++++++++++++
tests/regression/test_urcu_fork.c | 147 ++++
tests/regression/urcutorture.c | 30 +
tests/runall.sh | 104 ---
tests/runhash.sh | 136 ----
tests/runpaul-phase1.sh | 44 --
tests/runpaul-phase2.sh | 47 --
tests/runpaul-phase3.sh | 50 --
tests/runpaul-phase4.sh | 40 -
tests/runpaul-phase5.sh | 11 -
tests/runpaul-phase6.sh | 7 -
tests/runpaul-phase7.sh | 41 --
tests/runtests-batch.sh | 8 -
tests/runtests.sh | 10 -
tests/subphase4.sh | 101 ---
tests/test_cycles_per_loop.c | 44 --
tests/test_looplen.c | 93 ---
tests/test_mutex.c | 420 -----------
tests/test_perthreadlock.c | 431 -----------
tests/test_perthreadlock_timing.c | 215 ------
tests/test_rwlock.c | 412 -----------
tests/test_rwlock_timing.c | 200 -----
tests/test_uatomic.c | 87 ---
tests/test_urcu.c | 463 ------------
tests/test_urcu_assign.c | 460 ------------
tests/test_urcu_bp.c | 459 ------------
tests/test_urcu_defer.c | 447 -----------
tests/test_urcu_gc.c | 491 -------------
tests/test_urcu_hash.c | 682 -----------------
tests/test_urcu_hash.h | 419 -----------
tests/test_urcu_hash_rw.c | 275 -------
tests/test_urcu_hash_unique.c | 271 -------
tests/test_urcu_lfq.c | 462 ------------
tests/test_urcu_lfs.c | 458 ------------
tests/test_urcu_qsbr.c | 466 ------------
tests/test_urcu_qsbr_gc.c | 491 -------------
tests/test_urcu_qsbr_timing.c | 243 ------
tests/test_urcu_timing.c | 241 ------
tests/test_urcu_wfq.c | 416 -----------
tests/test_urcu_wfs.c | 416 -----------
tests/unit/Makefile.am | 61 ++
tests/unit/test_uatomic.c | 91 +++
tests/unit/test_urcu_multiflavor-bp.c | 39 +
tests/unit/test_urcu_multiflavor-mb.c | 39 +
tests/unit/test_urcu_multiflavor-memb.c | 38 +
tests/unit/test_urcu_multiflavor-qsbr.c | 38 +
tests/unit/test_urcu_multiflavor-signal.c | 39 +
tests/unit/test_urcu_multiflavor.c | 50 ++
tests/unit/test_urcu_multiflavor.h | 29 +
tests/unit/urcu-asm.c | 37 +
tests/urcu-asm.c | 37 -
tests/urcutorture.c | 30 -
urcu-bp.c | 117 +--
urcu-bp.h | 2 +
urcu-call-rcu-impl.h | 276 +++++--
urcu-call-rcu.h | 16 +-
urcu-defer-impl.h | 4 +-
urcu-flavor.h | 5 +
urcu-pointer.h | 6 +-
urcu-qsbr.c | 223 ++++--
urcu-qsbr.h | 2 +
urcu-wait.h | 185 +++++
urcu.c | 212 ++++--
urcu.h | 4 +
urcu/cds.h | 2 +
urcu/compiler.h | 12 +
urcu/config.h.in | 2 +-
urcu/futex.h | 2 +-
urcu/hlist.h | 93 ++-
urcu/lfstack.h | 226 ++++++
urcu/list.h | 179 ++---
urcu/map/urcu-bp.h | 13 +-
urcu/map/urcu-qsbr.h | 13 +-
urcu/map/urcu.h | 67 +-
urcu/rcuhlist.h | 48 +-
urcu/rculfhash.h | 19 +-
urcu/rculfstack.h | 47 +-
urcu/rculist.h | 48 +-
urcu/static/lfstack.h | 285 +++++++
urcu/static/urcu-bp.h | 147 ++--
urcu/static/urcu-pointer.h | 24 +-
urcu/static/urcu-qsbr.h | 156 +++-
urcu/static/urcu.h | 194 ++---
urcu/static/wfcqueue.h | 634 ++++++++++++++++
urcu/static/wfstack.h | 370 +++++++++-
urcu/system.h | 10 +-
urcu/tls-compat.h | 17 +-
urcu/uatomic/generic.h | 6 +-
urcu/wfcqueue.h | 417 +++++++++++
urcu/wfqueue.h | 58 +-
urcu/wfstack.h | 279 ++++++-
wfcqueue.c | 172 +++++
wfqueue.c | 3 +
wfstack.c | 72 +-
236 files changed, 22036 insertions(+), 11630 deletions(-)
Changelog:
2013-09-06 Userspace RCU 0.8.0
* Fix: hash table growth (for small tables) should be limited
* Fix: doc/examples cross-build
* Introduce URCU_INLINE_SMALL_FUNCTIONS
* Add missing tests/common/Makefile.am
* README: document make check/regtest/bench
* tests: split in check, regtest and bench targets
* Cleanup: doc/examples makefile
* Fix: doc/examples VPATH build
* doc/examples: Move the LIBS after the OBJECTS in the Makefile
* Document build work-around on MacOS X
* Fix tests: use of uninitialized variables
* test_urcu_hash*: initialize TLS seeds
* doc/examples: cds_lfht_for_each_entry_duplicate
* doc/examples: cds_lfht_lookup
* doc/examples: cds_lfht_destroy
* doc/examples: cds_lfht_add_replace
* doc/examples: cds_lfht_add_unique
* doc/examples: cds_lfht_add/cds_lfht_del
* doc/examples: add rculfqueue example
* doc/examples: add synchronize_rcu()
* doc/examples: add bp flavor
* doc/examples: add dist toplevel makefile
* doc/examples: add membarrier flavor
* doc/examples: document call_rcu()
* doc/examples: update qsbr example
* urcu signal: remove assertion on exit
* doc/examples: signal flavor
* doc/examples: add mb flavor
* doc/examples: update qsbr
* doc/examples: introduce urcu-flavors examples directory
* doc/examples: enhance rcu-flavor-qsbr example
* doc/examples: rename qsbr-minimal to rcu-flavor-qsbr
* doc/examples: automake stop on error
* doc/examples: hlist
* hlist/rcuhlist update
* doc/examples: fix typo in list example
* rcuhlist: make pointer stores atomic
* hlist, rcuhlist: cleanup coding style
* doc/examples: lfstack
* doc/examples: update cds_wfs_pop_all_blocking
* doc/examples: cds_wfs_pop_all_blocking
* doc/examples: cds_wfs_pop
* doc/examples: add missing Makefile
* doc/examples: cds_wfs_push
* doc/wfcqueue: cds_wfcq_splice
* doc/examples: add cds_wfcq_dequeue
* doc/examples: wfcq needs to link against urcu-common
* doc/examples: update queue comment
* doc/examples: fix make clean
* gitignore: add qsbr-minimal
* doc/examples: cds_wfcq_enqueue
* doc/examples: Move LIBS to each makefile
* doc/examples: cds_list_for_each_rcu
* doc/examples: cds_list_for_each_entry_rcu
* doc/examples: cds_list_replace_rcu
* doc/examples: cds_list_add_tail_rcu
* doc/examples: cds_list_del_rcu
* doc/examples: cds_list_add_rcu
* rculist: ensure atomic updates of next pointers
* rculist: implement cds_list_add_tail_rcu
* rculist.h and list.h style cleanup
* example makefile: add missing cd ..
* Update gitignore
* Fix: examples Makefile on FreeBSD
* hash table test: don't redefine CACHE_LINE_SIZE
* tests: use thread-id.h wrapper
* Implement thread-id.h wrapper
* tests: add missing unsigned long casts to pthread_self()
* Fix: don't build examples in static builds
* Add QSBR minimal example
* compiler.h: implement CAA_ARRAY_SIZE()
* document rcu barrier
* rcu barrier: handle OOM die urcu_die
* Implement rcu_barrier()
* rculfhash: document destroy context limitations
* Add MIPS to README
* Update README
* Update README testing info about FreeBSD
* test: fix api.h missing if brackets
* tests: fix incorrect counter
* Fix: membarrier fallback symbol conflict
* Fix: Use a filled signal mask to disable all signals
* urcu-bp: introduce struct urcu_gp
* Fix: struct urcu_gp broke multiflavor
* Cleanup test usage printout
* wfstack tests: use pop "last" state info
* wfstack: return whether pop is popping the last element
* wfcqueue tests: use dequeue empty state
* wfcqueue: return whether dequeue is dequeuing last element
* urcu: avoid false sharing for rcu_gp_ctr
* urcu: make the code of urcu-qsbr as normal urcu
* rculfhash: detect if resize/destroy are called within RCU read-side C.S.
* Documentation: rculfhash: cds_lfht_resize not within read-side C.S.
* fix: rculfhash don't change qsbr online state
* Add rcu_read_ongoing() API to each urcu flavor
* Add "sparc" host cpu to configure.ac
* futex: include syscall.h instead of sys/syscall.h
* Add tab to output in order to allow easy nesting of tables.
* Remove urcu-api-list.sh from dist tarball
* Add urcu-api-list.sh script
* list: implement cds_list_for_each_safe()
* Fix: tests/api.h use cpuset.h
* Fix hurd-i386: move cpuset tests outside of sched_setaffinity conditional
* Fix tests: finer-grained use of CPU_SET, CPU_ZERO and cpu_set_t
* Test for CPU_SET
* Fix build on architectures with HAVE_SCHED_GETCPU but without HAVE_SYSCONF
* README: document that Clang 3.0 (based on LLVM 3.0) is supported
* clang: silence "unused expression result" warning
* rculfhash: add assertions on node alignment
* Spelling cleanups within comments and documentation
* Fix configure checks for Tile
* uatomic: style fix
* doc/cds-api.txt: expand documentation
* README: document each API file
* README: reorganize
* Add compilation support for the TileGX architecture
* wfstack: add nonblocking to _LGPL_SOURCE API
* Discourage use of pthread_atfork() for call_rcu handlers
* Fix call_rcu fork handling
* test: fork handling
* rculfhash: add cds_lfht_replace to the write operations in the comments
* urcu: fix comments for cds_list_for_each_prev()
* documentation: fix rcu-api.txt duplicates
* test wfcq: remove unneeded urcu.h include
* test wfs: remove unneeded urcu.h include
* urcu: declare test_urcu_multiflavor functions
* urcu: remove the wrong comma
* wfstack: implement nonblocking pop and next
* wfcqueue: document first/next return values
* wfstack: update comments about cds_wfs_empty/first being wait-free
* wfstack API: rename cds_wfs_first_blocking to cds_wfs_first
* wfstack test: test if number of push to empty vs pop_all match
* wfstack: document first/next return values
* test wfstack: enforce external mutex if needed by default
* test wfcqueue: enforce external mutex if needed by default
* urcu-mb/signal/membarrier: batch concurrent synchronize_rcu()
* urcu-wait: move queue management code into urcu-wait.h
* urcu-wait: move wait code into separate file
* urcu-qsbr: batch concurrent synchronize_rcu()
* tests: use standard malloc/free for synchronize_rcu()
* urcu-bp: move quiescent threads to separate list
* urcu-mb/signal/membarrier: move quiescent threads to separate list
* urcu-qsbr: move offline threads to separate list
* urcu-bp: improve 2-phase wait scheme
* urcu-mb/signal/membarrier: improve 2-phase wait scheme
* urcu-qsbr: improve 2-phase wait scheme
* wfcqueue: implement mutex-free splice
* wfcqueue: document empty criterion
* urcu-call-rcu: use wait-free splice return value
* test wfcqueue: add tests for queue state return value
* wfcqueue: enqueue and splice return queue state
* Fix: wfcqueue nonblocking dequeue
* wfcqueue: Fix lock and unlock functions
* runtests: Make path of time binary configurable
* urcu-qsbr: skip Q.S. reporting if already reported
* Fix TLS detection: test with linker, add --disable-compiler-tls
* Cleanup: cast pthread_self() return value to unsigned long
* Fallback mechanism not working on platform where TLS is unsupported
* Revert "Fix: cross-build: configure.ac should use --target, not --host"
* Fix: cross-build: configure.ac should use --target, not --host
* test_urcu_wfcq: add splice and nosync tests
* test_urcu_wfs: cleanup
* test_urcu_lfs: cleanup
* Fix static linking: add missing static for _defer_rcu
* tests: report error value for make check
* Add multiflavor test program
* Fix static linking: fix symbol name namespaces
* Fix static linking: add missing static to thr_defer
* Fix static linking: add missing static
* deprecation: fix build with gcc < 4.5
* wfstack.c: update copyright notice
* Update wfstack copyright notice
* Comment fix: update associated LGPL header name
* Update cds-api.txt following API deprecations
* Deprecate wfqueue
* Deprecate rculfstack
* wfcqueue: introduce nonblocking API
* lfstack: test pop_all and pop
* lfstack: implement empty, pop_all and iterators, document API
* lfstack: implement test
* lfstack: implement lock-free stack
* wfstack: implement pop_all and iteration tests
* wfstack: implement cds_wfs_pop_all and iterators, document API
* rculfhash test: fix trivial memleak and return node leak and errors
* rculfhash: add missing extern
* Cleanup: fix cppcheck errors
* wfcqueue: remove ancient comment
* test_urcu_lfq: remove rcu_defer_register_thread() from test_urcu_lfq
* test_urcu_lfq: test for the proper pointer
* test_urcu_lfs: remove rcu_defer_register_thread() from test_urcu_lfs
* test_urcu_lfs: test for the proper pointer
* wfcqueue: clarify locking usage
* Document APIs in README
* Test cleanup: replace "l" parameter by "loops"
* Add wfcqueue header to cds.h
* Fix: urcu-bp, urcu, urcu-qsbr should include wfcqueue
* Fix: call_rcu list corruption on teardown (documentation)
* call_rcu: remove head field alignement, explain wfcqueue motivation
* wfcqueue: update credits in patch documentation
* wfcqueue documentation: hint at for_each iterators
* Fix urcu-call-rcu-impl.h: false-sharing
* call_rcu: use wfcqueue, eliminate false-sharing
* wfcqueue test
* wfcqueue: implement concurrency-efficient queue
* Ensure that read-side functions meet 10-line LGPL criterion
* tls-compat.h: document sigaltstack(2) limitation
* urcu: add notice to URCU_TLS() for it is not strictly async-signal-safe
* Document sigaltstack(2) limitation
* Documentation: update LICENSE file
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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