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2011-12-27Fix lwsync instruction feature testRickard Green
A feature test for the lwsync instruction performed on PowerPC hardware at runtime system startup got into an eternal loop if the instruction was not supported. This bug was introduced in erts-5.9/OTP-R15B.
2011-12-09Update copyright yearsBjörn-Egil Dahlberg
2011-12-02Build Win64 Erlang emulator using MSYSunknown
Still does not run, just compiles.
2011-11-16Remove remaining gcc 4.6 assigned-but-not-used warnings from ertsPatrik Nyblom
2011-11-13Merge branch 'rickard/bad-rwmtx-assert'Rickard Green
* rickard/bad-rwmtx-assert: Fix bad assertion in rwmtx implementation
2011-11-13Use critical sections as mutex implementation on WindowsRickard Green
Windows native critical sections are now used internally in the runtime system as mutex implementation. This since they perform better under extreme contention than our own implementation.
2011-11-11Fix bad assertion in rwmtx implementationRickard Green
2011-10-14Merge branch 'rickard/atomics-api/OTP-9014' and OTP_R14B04Rickard Green
Conflicts: erts/aclocal.m4 erts/emulator/beam/erl_db.c erts/emulator/sys/win32/sys.c erts/include/internal/ethread_header_config.h.in
2011-09-29Update copyright yearsBjörn-Egil Dahlberg
2011-09-16Merge branch 'pan/erts_printf_term/OTP-9435' into devBjörn-Egil Dahlberg
* pan/erts_printf_term/OTP-9435: Correct return values from write-functions in erl_printf
2011-09-08Merge branch 'hw/detect-cpus-on-irix' into devHenrik Nord
* hw/detect-cpus-on-irix: Detect the available CPUs on IRIX OTP-9531
2011-08-08Merge branch 'cg/fix-constant-logical-operand' into devHenrik Nord
* cg/fix-constant-logical-operand: Fix use of logical operator && with constant operand instead of bitwise &. OTP-9454
2011-08-08Merge branch 'pg/fix-freebsd-dualcore-detection' into devHenrik Nord
* pg/fix-freebsd-dualcore-detection: Fix bug in FreeBSD topology detection code OTP-9453
2011-07-13Correct return values from write-functions in erl_printfPatrik Nyblom
2011-06-14Improve ethread atomicsRickard Green
The ethread atomics API now also provide double word size atomics. Double word size atomics are implemented using native atomic instructions on x86 (when the cmpxchg8b instruction is available) and on x86_64 (when the cmpxchg16b instruction is available). On other hardware where 32-bit atomics or word size atomics are available, an optimized fallback is used; otherwise, a spinlock, or a mutex based fallback is used. The ethread library now performs runtime tests for presence of hardware features, such as for example SSE2 instructions, instead of requiring this to be determined at compile time. There are now functions implementing each atomic operation with the following implied memory barrier semantics: none, read, write, acquire, release, and full. Some of the operation-barrier combinations aren't especially useful. But instead of filtering useful ones out, and potentially miss a useful one, we implement them all. A much smaller set of functionality for native atomics are required to be implemented than before. More or less only cmpxchg and a membar macro are required to be implemented for each atomic size. Other functions will automatically be constructed from these. It is, of course, often wise to implement more that this if possible from a performance perspective.
2011-06-07Detect the available CPUs on IRIXHolger Weiß
Add support for querying the number of configured and online processors on SGI systems running IRIX.
2011-05-24Fix use of logical operator && with constant operand instead of bitwise &.Cristian Greco
2011-05-21Fix bug in FreeBSD topology detection codePaul Guyot
2011-05-20Update copyright yearsBjörn-Egil Dahlberg
2011-05-06erts_printf %R for relative ets-terms in halfword-vmSverker Eriksson
Conflicts: erts/emulator/beam/erl_printf_term.c
2011-04-27Merge branch 'sverker/erts_printf-halfword' into devSverker Eriksson
* sverker/erts_printf-halfword: erts_printf %be to print integers of size Eterm Fix use of type BeamInstr in hipe_debug.c Conflicts: erts/emulator/hipe/hipe_debug.c
2011-03-16erts_printf %be to print integers of size EtermSverker Eriksson
Existing %bp to print pointer size integers does not work in halfword emulator to print Eterm size integers.
2011-02-23Fix some wrong pointer dereferencesCristian Greco
2010-12-16Unbreak atomic fallbackRickard Green
2010-12-16Use 32-bit atomic for uaflgs in thread specific eventsRickard Green
2010-12-15Use 32-bit atomics for ethr_thr_createRickard Green
2010-12-15Use 32-bit atomics for mutex and rwmutex flagsRickard Green
2010-12-15Use 32-bit atomics for eventsRickard Green
2010-12-15Add support for 32-bit atomicsRickard Green
2010-12-14Move atomic API into own filesRickard Green
2010-12-14Remove unused ethread time functionalityRickard Green
2010-12-11Introduce ethr_sint_t and use it for atomicsRickard Green
The atomic memory operations interface used the 'long' type and assumed that it was of the same size as 'void *'. This is true on most platforms, however, not on Windows 64.
2010-12-06Merge branch 'rickard/rwmutex-bug/OTP-8925' into devRickard Green
* rickard/rwmutex-bug/OTP-8925: Fix erroneous assertion
2010-12-06Fix erroneous assertionRickard Green
2010-12-03Merge branch 'rickard/rwmutex-bug/OTP-8925' into devRickard Green
* rickard/rwmutex-bug/OTP-8925: Use correct argument types on rwlock_wake_set_flags()
2010-12-02Use correct argument types on rwlock_wake_set_flags()Rickard Green
2010-12-01Merge branch 'rickard/rwmutex-bug/OTP-8925' into devRickard Green
* rickard/rwmutex-bug/OTP-8925: Miscellaneous rwmutex bug fixes and improvements Don't use more reader groups than schedulers New test suite containing stress tests of the rwmutex implementation Conflicts: erts/emulator/beam/erl_init.c
2010-12-01Miscellaneous rwmutex bug fixes and improvementsRickard Green
The ERTS internal rwlock implementation could get into an inconsistent state. This bug was very seldom triggered, but could be during heavy contention. The bug was introduced in R14B (erts-5.8.1). The bug was most likely to be triggered when using the read_concurrency option on an ETS table that was frequently accessed from multiple processes doing lots of writes and reads. That is, in a situation where you typically don't want to use the read_concurrency option in the first place.
2010-11-18Merge branch 'pg/freebsd-cpu-affinity-and-topology' into devRickard Green
* pg/freebsd-cpu-affinity-and-topology: Add support for CPU affinity & topology detection on FreeBSD 8 OTP-8939
2010-11-18Add support for CPU affinity & topology detection on FreeBSD 8Paul Guyot
2010-10-01Teach read_topology not to crash on W2K3Patrik Nyblom
2010-09-08Fix deadlock in reader optimized rwlock implementationRickard Green
A bug causing a deadlock in the reader optimized rwlock implementation has been fixed. This bug appeared in commit 59ee2a593090e7d53c97ceba63cbd300d1b9657e, i.e., it has not been seen in any released versions.
2010-09-08Remove unused variablesRickard Green
2010-09-08Increase spincount with many schedulersRickard Green
2010-09-08Re-enable spin wait on ethreads rwlocksRickard Green
Spin wait on most ethread rwlocks used by the runtime system was unintentionally disabled during development. Spin wait has now been enabled again. This bug appeared in commit 59ee2a593090e7d53c97ceba63cbd300d1b9657e, i.e., it has not been seen in any released versions.
2010-08-30Fix faulty assertionsRickard Green
2010-08-30Implement automatic detection of CPU topology on WindowsRickard Green
The CPU topology is now automatically detected on Windows systems with less than 33 logical processors. The runtime system will now, also on Windows, by default bind schedulers to logical processors using the 'default_bind' bind type if the amount of schedulers is at least equal to the amount of logical processors configured, binding of schedulers is supported, and a CPU topology is available at startup.
2010-08-18Make it possible to reread and update detected CPU informationRickard Green
Calling erlang:system_info/1 with the new argument 'update_cpu_info' will make the runtime system reread and update the internally stored CPU information. For more information see the documentation of erlang:system_info(update_cpu_info).
2010-08-10Rewrite ethread libraryRickard Green
Large parts of the ethread library have been rewritten. The ethread library is an Erlang runtime system internal, portable thread library used by the runtime system itself. Most notable improvement is a reader optimized rwlock implementation which dramatically improve the performance of read-lock/read-unlock operations on multi processor systems by avoiding ping-ponging of the rwlock cache lines. The reader optimized rwlock implementation is used by miscellaneous rwlocks in the runtime system that are known to be read-locked frequently, and can be enabled on ETS tables by passing the `{read_concurrency, true}' option upon table creation. See the documentation of `ets:new/2' for more information. The ethread library can now also use the libatomic_ops library for atomic memory accesses. This makes it possible for the Erlang runtime system to utilize optimized atomic operations on more platforms than before. Use the `--with-libatomic_ops=PATH' configure command line argument when specifying where the libatomic_ops installation is located. The libatomic_ops library can be downloaded from: http://www.hpl.hp.com/research/linux/atomic_ops/ The changed API of the ethread library has also caused modifications in the Erlang runtime system. Preparations for the to come "delayed deallocation" feature has also been done since it depends on the ethread library. Note: When building for x86, the ethread library will now use instructions that first appeared on the pentium 4 processor. If you want the runtime system to be compatible with older processors (back to 486) you need to pass the `--enable-ethread-pre-pentium4-compatibility' configure command line argument when configuring the system.
2010-06-01OTP-8662 Fix ethr_rwmutex_tryrlockRickard Green
ethr_rwmutex_tryrlock() acquired and refused to acquire a lock with inverted logic. The lock was however never acquired in a thread unsafe manner. (Thanks to JR Zhang for noting this issue)