== [7.4.4] 2016-05-24 ==
* Eliminate 'signed-to-unsigned value extension' compiler warning in malloc.
* Eliminate 'variable set but not used' Cppcheck warnings in test_stack.
* Fix GCC 5.x compatibility for AArch64 double-wide primitives.
* Fix makefile preventing AO_pause undefined in libatomic_ops_gpl.
* Fix missing casts to match printf format specifier in test_atomic.
* Fix missing output folder on making auto-generated test files (Automake).
* Fix typo in configure.ac (in description of AO_ASM_X64_AVAILABLE).
* Minor fix of code alignment in mips AO_compare_and_swap.
* Remove TODO file.
* Restore contribution info in ChangeLog for authors not listed in git log.
Also, includes 7.2g changes.
Issues found with existing distfiles:
distfiles/eclipse-sourceBuild-srcIncluded-3.0.1.zip
distfiles/fortran-utils-1.1.tar.gz
distfiles/ivykis-0.39.tar.gz
distfiles/enum-1.11.tar.gz
distfiles/pvs-3.2-libraries.tgz
distfiles/pvs-3.2-linux.tgz
distfiles/pvs-3.2-solaris.tgz
distfiles/pvs-3.2-system.tgz
No changes made to these distinfo files.
Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden). All existing
SHA1 digests retained for now as an audit trail.
== [7.4.0] 2013-11-17 ==
* Add and/or/xor entries to list_atomic (tests).
* Add char/short/int/AO_double_t and dd_acquire cases to list_atomic (tests).
* Add compile-time assertion for size of 'standard' AO_double_t.
* Add double_store pthread-based implementation and tests.
* Add generalized CAS primitives of char/short/int size.
* Add generalized atomic and/or/xor operations for char/short/int types.
* Add generalized fetch_and_add_acquire/release (for ARMv6+).
* Add generic implementation of double_load primitives.
* Add information about AO_ASSUME_VISTA to README_win32.
* Add internal header containing only char/short/int/AO_t atomic loads.
* Add load/store primitives generalization based on CAS.
* Add lock-based implementation of char/short/int_fetch_compare_and_swap.
* Add makefile rule to test list_atomic.template syntax (tests).
* Add missing 'const' in aligned-atomic XSIZE_load implementation.
* Add missing double_compare_and_swap to generalization.
* Add missing generalization of no-barrier CAS in template.
* Add negative double-CAS test cases to test_atomic_include (tests).
* Add test_stack to Makefile.msft (tests).
* Adjust fprintf arguments type matching specifier in test_stack (tests).
* Adjust included filenames in atomic_ops_malloc and test_stack.
* Adjust quotes in echo command of Makefile.msft (Win32).
* Always use 'mfence' for nop_full if target CPU supports SSE2 (gcc/x86).
* Better document configure THREADDLLIBS variable.
* Cast away volatile on dereference in CAS-based generalization primitives.
* Change policy regarding version numbers ("micro" part instead of "alpha").
* Convert README to Markdown format.
* Define AO_NO_PTHREADS in configure if no pthreads (Win32 and VxWorks).
* Define AO_int_X operations for ARM and avr32.
* Define double-wide ordered loads/stores for x86.
* Define int_and/or/xor primitives in ao_t_is_int header.
* Define nop_full as compiler barrier for pre-ARMv6 single-core case.
* Do not duplicate BUILT_SOURCES entries in nobase_private_HEADERS (Makefile).
* Do not include standard_ao_double_t.h where double-CAS is unimplemented.
* Do not report absence of meaningless nop, load and store in test_atomic.
* Do not use deprecated AO_T and AO_TS_T (tests).
* Eliminate 'missing initializer' warning for AO_stack_t value initializer.
* Eliminate 64-bit compiler warnings in atomic_ops_malloc.
* Eliminate arithmetic shifts in double-CAS (gcc/arm, msftc/x86).
* Eliminate warning for fetch_and_add argument in test_atomic_include (tests).
* Enable Makefile.msft for Win64.
* Enable build using toolchain without pthreads.
* Enable double_compare_and_swap for non-cpp code (msftc/x86.h).
* Enable generalization of all variants of CAS via fetch_compare_and_swap.
* Enable test_stack for pthreads-w32 and Win32 with native threads.
* Fix generalized AO_char/short_compare_and_swap args (missing 'unsigned').
* Fix makefile sed rule for list_atomic (tests).
* Fix missing abort() usage in atomic_ops_malloc and tests on WinCE.
* Generalize compare_double_and_swap_double using double_compare_and_swap.
* Generalize double_load/store for x86_64 (GCC).
* Generate ao_t_is_int, 'loadstore' headers from templates.
* Generate generalized AO_t load/store/fetch_and_add primitives from template.
* Generate ordered_loads/stores_only headers from templates.
* Group all X_acquire_release_volatile.h and X_[aligned_]atomic_load_store.h.
* Implement and/or/xor, AO_double_load for ARM.
* Implement atomic store using direct write by default on ARMv6+.
* Implement char/short/int-wide primitives using GCC built-in atomic/sync.
* Implement char/short/int_fetch_and_add for msftc/x86[_64] (Win32).
* Implement char/short_fetch_and_add, char/short_load for ARMv6+ (GCC).
* Implement char/short_store primitives at aligned addresses for ARM.
* Implement compare_double_and_swap_double for SunCC/x86.
* Implement double_load/store based on guaranteed x86 access atomicity.
* Implement double_store for ARMv7 using LDREXD/STREXD.
* Implement load/store via simple LDR/STR for ARMv6+ (msftc).
* Implement nop_full/write using 'dmb' instruction if available (gcc/arm).
* Improve debug printing in test_stack (tests).
* Log messages to stdout instead of stderr (tests).
* Make AO_ASSUME_VISTA also enables Win98 code in msftc/x86.h (Win32).
* Minimize gcc/generic-arithm template by factoring out barriers.
* Move 'unsigned' keyword to XCTYPE in generalize-small template.
* Move default compiler options to CFLAGS in Makefile.msft (Win32).
* Move definitions of ordered loads/stores to inner separate headers.
* Move gcc-generic AO_t-wide primitives to generic-small/arithm headers.
* Move generalized arithmetical primitives to 'generalize-arithm' template.
* Optimize AO_spin manually to minimize compiler influence on its duration.
* Parameterize list_atomic template with XSIZE (tests).
* Perform only few list reversals in test_malloc if AO based on pthreads.
* Put autogen.sh to 'dist' package (Automake).
* Remote duplicate definition of test_and_set_acquire in generalize.h.
* Remove X_aligned_atomic_load_store headers and template.
* Remove duplicate AO_spin and AO_pause definition in atomic_ops_stack.
* Remove gcc/x86_64.h eliminating code duplication of gcc/x86.h.
* Remove nested AO_USE_PTHREAD_DEFS macro check in atomic_ops.h (gcc/arm).
* Remove redundant 'cc' clobber for LDREXD instruction (gcc/arm).
* Remove store_full from msftc/arm.h in favor of generalized primitive.
* Remove sunc/x86_64.h eliminating code duplication of sunc/x86.h.
* Remove unsafe emulation-based implementation of double CAS (SunCC/x86_64).
* Remove useless 'perror' call in run_parallel.h (tests).
* Reorder AO_double_t union elements for AO_DOUBLE_T_INITIALIZER portability.
* Replace atomic_load_store.template with atomic_load and atomic_store ones.
* Replace some FIXME items with TODO in atomic_ops.c and sysdeps headers.
* Specify fetch_and_add/sub1 result as unused in test_atomic (tests).
* Support AArch64 (64-bit ARM) target (GCC).
* Support ARMv8 target (gcc/arm).
* Test double_compare_and_swap in test_atomic (tests).
* Use AO_ prefix for internal functions in arm_v6.h, hppa.h.
* Use __atomic GCC built-in to implement generic double-wide CAS.
* Use built-in __sync CAS for double-CAS if AO_USE_SYNC_CAS_BUILTIN for x86.
* Workaround GCC 4.4.3 warning reported for 'val' of list_atomic.c (tests).
== [7.3alpha2] 2012-05-11 ==
* Add '-no-undefined' to LDFLAGS in src/Makefile.am.
* Add AO_and, AO_xor atomic operations.
* Add AO_fetch_compare_and_swap primitives.
* Add and fill in AUTHORS, TODO files.
* Add autogen.sh file.
* Adjust AO_..._H macros in public headers.
* Code refactoring of gcc/arm.h by introducing AO_ARM_HAVE_x macros.
* Define AO macros for libatomic_ops version identification.
* Do not define NDEBUG if '--enable-assertions' passed to configure.
* Eliminate compiler warnings in various functions and macros.
* Generalize AO_compare_and_swap primitives via AO_fetch_compare_and_swap.
* Generalize acquire/release/full CAS primitives for MIPS
* Implement fetch_and_add, test_and_set primitives for MIPS.
* Improve Makefile for MS VC++; pass '-W3' option to MS compiler.
* Include ao_t_is_int.h from atomic_ops.h after first generalization pass
* Merge all Makefile.am files in src tree.
* Minor code refactoring of atomic_ops.c, generic_pthread.h.
* Minor configure build improvements (e.g., ensure proper autoconf version).
* Place only major per-release changes description to ChangeLog (this file).
* Recognize AO_PREFER_GENERALIZED macro to favor generalization over assembly.
* Remove all auto-generated files except for generalize-small.h from the repo.
* Remove duplicate doc/COPYING and empty NEWS files.
* Replace atomic_ops_malloc static mmap-related empty functions with macros.
* Replace pointer relational comparisons with non-pointer ones.
* Require autoconf 2.61 instead of v2.64.
* Show extra compiler warnings (GCC only).
* Turn off AO primitives inlining if AO_NO_INLINE defined.
* Use __builtin_expect in CAS failure loop condition checks (GCC only).
== [7.2e] 2013-11-10 ==
* Fix (remove) invalid include of read_ordered.h for ARM.
* Fix AM_CONFIG_HEADER in configure for autoconf-2.69-1.
* Fix AO_pause sleep delay for particular argument values (Win32).
* Fix ARMv7 LDREXD/STREXD double-wide operand specification (GCC/Clang).
* Fix LDREXD/STREXD use for pre-Clang3.3/arm.
* Fix README regarding _acquire_read barrier.
* Fix XSIZE_load/store definition order in generalize-small template.
* Fix asm constraint of CAS memory operand for gcc/alpha, clang-3.1/mips.
* Fix asm constraints of primitives in sunc/x86.h.
* Fix cmpxchg16b-based compare_double_and_swap_double for SunCC/x86_64.
* Fix compare_double_and_swap_double and double_ptr_storage for gcc/x32.
* Fix compare_double_and_swap_double for clang3.0/x86 in PIC mode.
* Fix compare_double_and_swap_double_full definition condition in emul_cas.
* Fix generalize-small template adding missed CAS-based fetch_and_add.
* Fix generalized fetch_and_add function.
* Fix missing compiler barrier in nop_full for uniprocessor ARM.
* Fix ordered_except_wr header inclusion for s390.
* Fix return type of AO_int_X primitives defined in ao_t_is_int header.
* Fix return type of char/short/int_load_read() in read_ordered.h.
* Fix template-based headers regeneration order in src/Makefile.
* Fix typos in ao_t_is_int, atomic_ops.h, generalize.h, msftc/arm.h comments.
* Fix variable type to match printf format specifier in test_stack.
* Fix visibility and initial value of 'dummy' variable in atomic_ops_stack.
* Terminate tests with abort after error reported.
== [7.2d] 2012-08-09 ==
* Fix AO_compare_double_and_swap_double_full for gcc-4.2.1/x86 in PIC mode.
* Fix AO_compiler_barrier missing parentheses.
* Fix missing 'unsigned' for generalized AO_char/short_fetch_and_add result.
== [7.2] 2012-05-11 ==
* Add atomic_ops.pc.in and atomic_ops-uninstalled.pc.in to pkgconfig folder.
* Define and use AO_PTRDIFF_T in tests for casts between pointer and integer.
* Fix AO_compare_and_swap return type for s390 and PowerPC.
* Fix AO_compare_double_and_swap_double_full for gcc/x86 (PIC mode).
* Fix AO_stack_push_release to workaround bug in clang-1.1/x86 compiler.
* Fix AO_test_and_setXX in tests/list_atomic.template.
* Fix AO_test_and_set_full (gcc/x86[_64].h) to work-around a bug in LLVM v2.7.
* Fix AO_test_and_set_full on m68k.
* Fix __ARM_ARCH_5__ macro handling for Android NDK (ARMv7).
* Fix configure for Cygwin, mingw-w64/32.
* Fix configure to define __PIC__ macro explicitly if needed (GCC).
* Fix double_ptr_storage definition for GCC pre-v4 (x86_64).
* Fix for x32 by removing 'q' suffix in x86-64 instructions.
* Fix generalization for IA-64 (regarding AO_or, AO_..._read/write primitives)
* Fix generalized AO_<type>_fetch_and_add() return type.
* Fix test_atomic_include for the case of missing CAS primitive.
* Fix test_malloc - allocate less memory in case of missing mmap.
* Implement the basic atomic primitives for the hexagon CPU.
The latest code is only found in the boehm-gc CVS repository (see
Makefile.version for information). I had to take this from there,
as there were bug fixes.
This library was imported primarily for the [hopefully]
upcoming audio/pulseaudio package.
TODO: Add support for NetBSD atomic ops?
This package provides semi-portable access to hardware provided
atomic memory operations. These might allow you to write code:
- That does more interesting things in signal handlers.
- Makes more effective use of multiprocessors by allowing you to write
clever lock-free code. Note that such code is very difficult to get
right, and will unavoidably be less portable than lock-based code. It
ia also not always faster than lock-based code. But it may occasionally
be a large performance win.
- To experiment with new and much better thread programming paradigms, etc.
As the latest code for this library is only available via CVS, this package
provides a snapshot.
