ChangeLog

   1 2015-09-09 Userspace RCU 0.7.15
   2         * Disable sys_membarrier
   3         * uatomic: Specify complete types for atomic function calls
   4         * Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
   5         * Fix: compat_futex.c: *uaddr should be read as volatile
   6         * Fix: call_rcu_thread() affinity failure
   7         * urcu: fix deprecation warning with new glibc
   8
   9 2015-04-28 Userspace RCU 0.7.14
  10         * Fix: call rcu should call internal RCU API
  11         * Fix: deadlock when thread join is issued in read-side C.S.
  12         * Fix: rename RCU_DEBUG to DEBUG_RCU in urcu-qsbr.h
  13         * Mark braced-groups within expressions with __extension__
  14         * Fix: compat_futex_noasync race condition
  15         * Fix: documentation: urcu-pointer.h: s/rcu_dereference_pointer/rcu_dereference/
  16         * Fix: silence gcc -Wextra warning
  17
  18 2014-10-21 Userspace RCU 0.7.13
  19         * rculfhash: remove duplicated code
  20         * rculfhash: handle pthread_create failures
  21         * rculfhash: fall back to single-threaded resize on calloc failure
  22         * x86: drop extra semi-colon in caa_cpu_relax
  23         * call_rcu threads should clear their PAUSED flag when they unpause
  24         * Fix: bring back dummy rcu_bp_exit symbol
  25
  26 2014-03-08 Userspace RCU 0.7.12
  27         * Fix: move wait loop increment before first conditional block
  28
  29 2014-03-01 Userspace RCU 0.7.11
  30         * Fix: high cpu usage in synchronize_rcu with long RCU read-side C.S.
  31
  32 2014-02-28 Userspace RCU 0.7.10
  33         * Fix: urcu-bp interaction with threads vs constructors/destructors
  34         * Fix undefined NULL pointer arithmetic
  35         * Blacklist ARM gcc 4.8.0, 4.8.1, 4.8.2
  36         * rculfhash: document max_nr_buckets = 0
  37
  38 2013-11-12 Userspace RCU 0.7.9
  39         * tls-compat: fix comment typo
  40         * Keep ABI compatible with already compiled LGPL applications
  41         * Fix: tls-compat multi-lib conflict
  42         * gcc warning fixes: -Wsign-compare and -Wextra
  43         * Fix: urcu-qsbr: reversed logic on RCU_DEBUG
  44         * Fix: urcu-bp segfault in glibc pthread_kill()
  45         * Fix urcu-bp: don't move registry
  46         * Fix: compat futex duplicated lock and completion
  47         * Fix: i386 compat code duplicated mutex instances
  48         * Fix: urcu-bp: Bulletproof RCU arena resize bug
  49         * Fix: test_mutex.c uninitialized mutex
  50
  51 2013-09-06 Userspace RCU 0.7.8
  52         * Fix: hash table growth (for small tables) should be limited
  53         * Document build work-around on MacOS X
  54         * Fix tests: use of uninitialized variables
  55         * tests: add missing unsigned long casts to pthread_self()
  56
  57 2013-06-18 Userspace RCU 0.7.7
  58         * rculfhash: document destroy context limitation
  59         * Fix: Use a filled signal mask to disable all signals
  60         * Document: rculfhash destroy and resize side-effect in 0.7
  61         * Add "sparc" host cpu to configure.ac
  62         * Fix: tests/api.h use cpuset.h
  63         * Fix hurd-i386: move cpuset tests outside of sched_setaffinity conditional
  64         * Fix tests: finer-grained use of CPU_SET, CPU_ZERO and cpu_set_t
  65         * Test for CPU_SET
  66         * Fix build on architectures with HAVE_SCHED_GETCPU but without HAVE_SYSCONF
  67         * README: document that Clang 3.0 (based on LLVM 3.0) is supported
  68         * clang: silence "unused expression result" warning
  69         * rculfhash: add assertions on node alignment
  70         * uatomic: style fix
  71
  72 2013-01-09 Userspace RCU 0.7.6
  73         * Discourage use of pthread_atfork() for call_rcu handlers
  74         * Fix call_rcu fork handling
  75         * test: fork handling
  76         * Fix TLS detection: test with linker, add --disable-compiler-tls
  77         * Cleanup: cast pthread_self() return value to unsigned long
  78         * Fallback mechanism not working on platform where TLS is unsupported
  79
  80 2012-10-12 Userspace RCU 0.7.5
  81         * 19cf3ae Fix: call_rcu list corruption on teardown
  82         * Ensure that read-side functions meet 10-line LGPL criterion
  83         * tls-compat.h: document sigaltstack(2) limitation
  84         * urcu: add notice to URCU_TLS() for it is not strictly async-signal-safe
  85         * Document sigaltstack(2) limitation
  86         * Documentation: update LICENSE file
  87
  88 2012-08-27 Userspace RCU 0.7.4
  89         * rculfhash API documentation: document destroy RCU read-lock constraint
  90         * Fix: rculfhash should be offline while waiting for resize to complete
  91         * Add missing entry to gitignore
  92         * urcu: move busy-wait code and name it ___cds_wfq_node_sync_next()
  93         * urcu: fix compat_futex_noasync()
  94         * urcu: add hint to DEFINE_URCU_TLS() for compound types
  95         * Fix: CAA_BUILD_BUG_ON should refer to CAA_BUILD_BUG_ON_ZERO
  96         * Add MIPS support
  97         * Compatibility: remove bash-ismsm from test scripts
  98         * Fix inappropriate lib behavior: don't call exit()
  99         * Fix: re-enable compatibility with autoconf < 2.64
 100         * Fix c99 compatibility: use __asm__ and __volatile__ in public headers
 101         * Fix c99 compatibility: use __typeof__ instead of typeof in public headers
 102         * warning fix: tests urcutorture for NetBSD 5
 103
 104 2012-06-01 Userspace RCU 0.7.3
 105         * Fix tests: make dist lib dependency
 106         * Update README for OS supported, tests dependency
 107         * Add CodingStyle to tarball
 108         * Add coding style document
 109         * Test fix: test_perthreadlock uninitialized mutex
 110         * tests: support FreeBSD short "time" args
 111         * freebsd 8.2 fix: define MAP_ANONYMOUS for compatibility
 112
 113 2012-05-24 Userspace RCU 0.7.2
 114         * Fix library compatibility
 115
 116 2012-05-24 Userspace RCU 0.7.1
 117         * fix: uatomic_set return value compile fix for non-x86 arch.
 118
 119 2012-05-21 Userspace RCU 0.7.0
 120         * Cleanup: header comments coding style
 121         * Document uatomic operations
 122         * Update return value of "set" operations
 123         * Fix mremap wrapper for NetBSD 5
 124         * Use urcu/tls-compat.h
 125         * Implement urcu/tls-compat.h
 126         * Add TLS detection m4 macro
 127         * document concurrent data structures
 128         * documentation: refer to rcu-api.txt
 129         * Move API.txt to doc/rcu-api.txt, install in system doc/
 130         * rculfhash: document implied memory barriers
 131         * rculfhash: Ensure future-proof memory barrier semantic consistency
 132         * API cleanup: use "uatomic_*" in cmm_smp_mb__ API
 133         * uatomic: add memory barrier API for and/or/add/sub/inc/sub
 134         * rculfhash: add runhash.sh test script
 135         * rculfhash tests: add missing check
 136         * rculfhash: fix: race between replace and del operations
 137         * rculfhash: replace unneeded rcu_dereference by CMM_LOAD_SHARED
 138         * rculfhash: use do {} while (0) for dbg_printf()
 139         * rculfhash: cleanup typo
 140         * rculfhash: update API comments
 141         * rculfhash: update comments in implementation
 142         * rculfhash tests: add long hash chains tests
 143         * rculfhash tests: add uniqueness test
 144         * rculfhash test: print test name
 145         * rculfhash: stress requirement in documentation
 146         * rculfhash: fix typo
 147         * rculfhash tests: use array of callbacks to modularize
 148         * rculfhash tests: modularize tests
 149         * rculfhash: document ordering guarantees
 150         * rculfhash: document linearizability guarantees
 151         * rculfhash: update removal comment
 152         * Add missing files to .gitignore
 153         * Fix out-of-tree build
 154         * rculfhash: check malloc NULL pointer
 155         * Fix uatomic sign cast
 156         * Remove unused jhash.h file
 157         * Fix: use known license text, fix incorrect FSF address
 158         * Fix: add missing sched.h include in rculfhash.c
 159         * Allow tests to run on architectures without per-cpu call_rcu support
 160         * Hash table test: FreeBSD compatibility fix
 161         * tests: define _GNU_SOURCE instead of __USE_GNU
 162         * RCU lock-free hash table: implement cds_lfht_is_node_deleted()
 163         * Define _GNU_SOURCE to access CPU_ZERO() macro in uClibc
 164         * Install ChangeLog and README into system's doc
 165         * Fix AC_LANG_SOURCE usage: only takes one parameter
 166         * Fix autoconf futex check
 167         * configure.ac: Use AC_LANG_SOURCE for if else macros
 168         * Refresh autoconf files
 169         * Update gitignore
 170         * rculfhash: add comment about hash seed randomness within test program
 171         * readme: state correct GCC dependency for ARM
 172         * rculfhash: remove an invocation of bit_reverse_ulong() when adding
 173         * rculfhash: remove unneeded conversion
 174         * rculfhash: remove unneeded clear_flag()
 175         * cds_lfht_replace: add checks for old/new node hash/value match
 176         * rculfhash: use node instead of iter argument for deletion
 177         * rculfhash: number of logically removed nodes should not appear in API
 178         * Document that flags could be represented on 2 bits
 179         * Add missing REMOVAL_OWNER_FLAG comment to cds_lfht_node comment
 180         * _cds_lfht_del is not used for buckets anymore, remove parameter
 181         * rculfhash: Relax atomicity guarantees required by removal operation
 182         * remove unneeded "return;"
 183         * simplify the deletion for bucket node
 184         * Remove unneeded code
 185         * Cleanup DEFINE_RCU_FLAVOR()
 186         * Add cds_lfht_ prefix to fls_ulong, get_count_order_ulong, get_count_order_u32
 187         * Merge RCU Lock-Free Resizable Hash Table
 188
 189 2011-12-12 Userspace RCU 0.6.7
 190         * Add compat file for test urcu wfs
 191         * Add missing compat file for wfq test
 192         * hlist.h: Add missing stddef.h include for NULL
 193         * call_rcu: Add missing call_rcu_before_fork and
 194           call_rcu_after_fork_parent declarations
 195         * Describe autotools/libtool/automake version dependency
 196         * Remove m4_ifdef for AC_PROG_LIBTOOL (deprecated)
 197         * Support older autotools
 198         * Apply autoupdate to configure.ac
 199         * Fix build for amd64 environment (for FreeBSD 8.2)
 200         * Add missing rcu_dereference_sym_bp
 201         * Install test scripts in the dist tarball
 202
 203 2011-11-03 Userspace RCU 0.6.6
 204         * qsbr vs call_rcu : remove exit assertion
 205         * Rename likely/unlikely to caa_likely/caa_unlikely
 206         * Reinsert missing test_urcu_*.c files (missing in rename)
 207         * rename test_qsbr to test_urcu_qsbr
 208         * urcu-pointer: fix rcu_set_pointer unset return value
 209         * Enhance API.txt documentation, add to Makefile as EXTRA_DIST
 210
 211 2011-09-29 Userspace RCU 0.6.5
 212         * call_rcu: Document call_rcu requirements
 213         * call_rcu: fix error handling of malloc error
 214         * urcu call_rcu: Use RCU read-side protection for per-cpu call_rcu data
 215         * urcu,call_rcu: Cleanup call_rcu_data pointers before use in child
 216         * urcu,call_rcu: avoid create call_rcu_data for child when unneed
 217         * urcu,defer_rcu: Make defer_rcu encoding more compact for marker
 218         * urcu_defer: Use cancellation flag instead of pthread_cancel()
 219         * urcu,call_rcu: protects call_rcu_data_list when remove node
 220         * Create default call rcu data upon per-cpu call-rcu teardown
 221         * powerpc: use __NO_LWSYNC__ check to use appropriate lwsync/sync opcode
 222         * cmm: provide lightweight smp_rmb/smp_wmb on PPC
 223         * atomic: provide seq_cst semantics on powerpc
 224         * avoid leaking crdp for failed path
 225         * Return -EEXIST when the old cpu call_rcu_data has not been removed
 226         * protect writing to per_cpu_call_rcu_data[*]
 227         * wake up default call_rcu thread after we move the leftover callbacks
 228         * avoid memory leak in call_rcu_data_free()
 229         * urcu call_rcu: fix use after free()
 230         * use get_cpu_call_rcu_data() for get_call_rcu_data()
 231         * init maxcpus before use
 232         * call_rcu implementation: add missing static
 233         * Document QSBR interaction with mutexes
 234         * urcu-pointer: implement URCU_FORCE_CAST for C++ compatibility of urcu-pointer.h
 235         * urcu-qsbr: use rcu_thread_offline/rcu_thread_online instead of inlining them
 236         * Pair all_cpu call_rcu create with free
 237         * QSBR: add missing wakeups in synchronize_rcu code
 238         * cmm: do not generate code for smp_rmb/smp_wmb on x86_64
 239         * cmm: let per-arch files provide cmm_smp_* barriers
 240         * Optimize caa_get_cycles() for PowerPC64
 241         * lfq/lfs tests: use call_rcu
 242         * list: Add cds_list_first_entry
 243         * rculfstack/queue: define _LGPL_SOURCE around static header include
 244         * Add __rcu annotation (unimplemented)
 245         * Fix incorrect fsf address in header files
 246         * wfstack: push returns prior stack emptiness state
 247         * Make lf stack push return if the stack was empty
 248         * Document caa_container_of
 249         * urcu-bp: do not call munmap for NULL registry at exit
 250         * urcu libraries can directly use the _LGPL_SOURCE wfqueue
 251         * rculfstack: document "push"
 252         * Add runall.sh to tarball
 253         * Fix build order of liburcu-cds-common
 254         * Fix missing check for SYS_membarrier in map header
 255         * urcu-qsbr: avoid useless futex wakeups and burning CPU for long grace periods
 256         * api: reimplement BUILD_BUG_ON in compiler.h
 257         * test api cleanup: remove unused primitives
 258         * put thread offline while waiting for the init flag
 259         * urcu: move private definitions to .c file
 260         * urcu-bp: move private definitions to .c file
 261         * urcu-qsbr: move private definitions to .c file
 262         * rcutorture: fix rcutorture-qsbr
 263         * wfqueue: fix type-incorrect assignment
 264         * Fix tests Makefile EXTRA_DIST to use api.h
 265         * Fix choice of default flavour in urcu/map/urcu.h
 266         * api: remove list/hlist
 267         * api: remove arch-specific files
 268         * api: make api_gcc.h a superset of the other headers
 269         * tests api: remove atomics
 270         * put thread offline while waiting for the init flag
 271         * urcu: move private definitions to .c file
 272         * urcu-bp: move private definitions to .c file
 273         * urcu-qsbr: move private definitions to .c file
 274         * rcutorture: fix rcutorture-qsbr
 275         * wfqueue: fix type-incorrect assignment
 276         * Use caa_ prefix for min() and max()
 277
 278 2011-07-21 Userspace RCU 0.6.4
 279         * uatomic: Fix ARM build errors in uatomic.
 280         * urcu tests: hold mutex across use of custom allocator.
 281         * Portability fixes to support FreeBSD 8.2.
 282
 283 2011-06-27 Userspace RCU 0.6.3
 284         * uatomic: Fix i386 compatibility build errors in uatomic.
 285
 286 2011-06-13 Userspace RCU 0.6.2
 287         * Fix build on powerpc.
 288
 289 2011-06-13 Userspace RCU 0.6.1
 290         * Add missing headers into release tarball:
 291             urcu-call-rcu-impl.h and urcu-defer-impl.h
 292
 293 2011-06-10 Userspace RCU 0.6.0
 294         * Added call_rcu() support, graciously contributed by Paul E. McKenney.
 295         * Added urcu/cds.h and merged all "Concurrent Data Containers" (CDS)
 296           into a single .so: liburcu-cds.so to have a single header/shared
 297           object holding all concurrency-aware data containers. It provides
 298           support for RCU lists, queues and stacks at the moment.
 299         * liburcu 0.6.0 now allows linking a single application with multiple
 300           flavors of RCU. This required a library API change which is
 301           incompatible with older 0.5.x liburcu. The .so version number
 302           is therefore bumped from 0 to 1 (e.g. liburcu.so.1).
 303         * Added "atfork" handling API, documented in README. Only useful for
 304           processes using fork() without following exec().
 305         * Renaming the following files, keeping the old files (producing a
 306           compiler warning):
 307             urcu/uatomic_arch.h -> urcu/uatomic.h
 308             urcu/urcu-futex.h -> urcu/futex.h
 309             urcu/urcu_ref.h -> urcu/ref.h
 310
 311 2011-03-04 Userspace RCU 0.5.4
 312          *  urcu-bp: Update fork() handling
 313
 314             Introduce
 315
 316             extern void rcu_bp_before_fork(void);
 317             extern void rcu_bp_after_fork_parent(void);
 318             extern void rcu_bp_after_fork_child(void);
 319
 320             to handle fork gracefully. These disable signals and hold
 321             the registry mutex across forks. (this flavor of the liburcu
 322             library ("bp" for "bulletproof") is mainly used by UST, the
 323             user-space tracer).
 324
 325 2011-03-03 Userspace RCU 0.5.3
 326         * Add support for older ARM single-CPU architecturess (pre-ARMv7)
 327           (thanks to Jason Wessel from WindRiver).
 328         * Fix ARMv7 cmm_rmb/cmm_wmb primitives (use a dmb barrier).
 329         * Remove leftover list_t type from urcu/list.h (namespace cleanup).
 330         * urcu_defer: handle malloc error value.
 331         * Update README file to describe urcu interaction with fork() when not
 332         * followed
 333           by an exec() system call.
 334
 335 2010-11-18 Userspace RCU 0.5.2
 336         * Fix renaming error introduced in 0.5.0.
 337
 338 2010-11-18 Userspace RCU 0.5.1
 339         * Fix renaming error introduced in 0.5.0. (incomplete fix)
 340
 341 2010-11-18 Userspace RCU 0.5.0
 342         * Version 0.5.0 changes the API presented by memory model,
 343           architecture abstraction and data structure primitives in
 344           headers. The prefixes are, respectively:
 345             - cmm_ : Concurrent Memory Model
 346             - caa_ : Concurrent Architecture Abstraction
 347             - cds_ : Concurrent Data Structures
 348
 349 2010-03-04 Userspace RCU 0.4.2
 350         * Add generic uatomic ops support.
 351         * Bugfix in urcu-bp. (rare garbage collection bug occurring in
 352           multithreaded environment). Only affects urcu-bp users (UST).
 353
 354 2010-02-12 Userspace RCU 0.4.1
 355         * s390: compilation fix.
 356
 357 2010-01-30 Userspace RCU 0.4.0
 358         * API change: SIGURCU -> SIGRCU
 359         * API changes: standardize on rcu_ prefix.
 360         * API change: urcu_init -> rcu_init.
 361         * urcu/config.h options renamed to CONFIG_RCU_HAVE_FENCE,
 362           CONFIG_RCU_HAVE_FUTEX, CONFIG_RCU_SMP, CONFIG_RCU_COMPAT_ARCH.
 363           ((moving from URCU -> RCU).
 364         * library names changes: liburcu becomes the "default" version, using
 365           sys_membarrier() when available, and using liburcu-mb as a
 366           fallback.
 367         * The signal-based liburcu is renamed from liburcu to
 368           liburcu-signal. People previously using the signal-based
 369           "liburcu" will automatically be moved to the "default" liburcu
 370           version.
 371
 372 2009-11-16 Userspace RCU 0.3.1
 373         * Add support for sparcv9 32-bit build.
 374         * Update build system to use --host instead of --target.
 375
 376 2009-11-03 Userspace RCU 0.3.0
 377         * API change for the "deferred work" interface.
 378
 379 2009-10-14 Userspace RCU 0.2.3
 380         * Move to autotools.
 381         * Automated architecture detection, with i386 fallback.
 382         * Detect if NR_futex is on the system, fallback on portable
 383           alternatives.
 384         * Add configure mode for UP-only systems.
 385
 386 2009-10-02 Userspace RCU 0.2.2
 387         * Phases out rcu_publish_content() api.
 388         * Adds type checking to urcu-pointer.h pointer exchange primitives.
 389
 390 2009-10-02 Userspace RCU 0.2.1
 391         * small header dependency fix for rculist.h.
 392         * new "liburcu-bp.so" : "Bulletproof RCU", made especially for
 393           the UST userspace tracer. It's a library that sacrifices a bit
 394           of read-side performance for automatically monitoring thread
 395           creation/removal. See README for details.
 396
 397 2009-10-01 Userspace RCU 0.2
 398         * Clarify usage of rcu_cmpxchg_pointer, rcu_xchg_pointer,
 399           rcu_set_pointer.
 400
 401 2009-09-29 Userspace RCU 0.1
 402         * Initial release.