thread_pthread.c: variable for errno

* thread_pthread.c (rb_thread_wakeup_timer_thread_fd): use a local
  variable for errno.

* thread_pthread.c (consume_communication_pipe): ditto.  add
  EWOULDBLOCK case.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45909 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-05-11

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
signal.c: directly enqueue

* signal.c (rb_f_kill): directly enqueue an ignored signal to self,
  except for SIGSEGV and SIGBUS.  [ruby-dev:48203] [Bug #9820]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45911 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: always deliver signal immediately

* thread.c (ruby_kill): always deliver signal immediately, without
  check for main thread.  no longer called in other context.
  [ruby-dev:48203] [Bug #9820]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45912 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm*: doubly-linked list from ccan to manage vm->living_threads

A doubly-linked list for tracking living threads guarantees
constant-time insert/delete performance with no corner cases of a
hash table.  I chose this ccan implementation of doubly-linked
lists over the BSD sys/queue.h implementation since:

1) insertion and removal are both branchless
2) locality is improved if a struct may be a member of multiple lists
   (0002 patch in Feature 9632 will introduce a secondary list
   for waiting FDs)

This also increases cache locality during iteration: improving
performance in a new IO#close benchmark with many sleeping threads
while still scanning the same number of threads.

	vm_thread_close 1.762

* vm_core.h (rb_vm_t): list_head and counter for living_threads
  (rb_thread_t): vmlt_node for living_threads linkage
  (rb_vm_living_threads_init): new function wrapper
  (rb_vm_living_threads_insert): ditto
  (rb_vm_living_threads_remove): ditto
* vm.c (rb_vm_living_threads_foreach): new function wrapper
* thread.c (terminate_i, thread_start_func_2, thread_create_core,
  thread_fd_close_i, thread_fd_close): update to use new APIs
* vm.c (vm_mark_each_thread_func, rb_vm_mark, ruby_vm_destruct,
  vm_memsize, vm_init2, Init_VM): ditto
* vm_trace.c (clear_trace_func_i, rb_clear_trace_func): ditto
* benchmark/bm_vm_thread_close.rb: added to show improvement
* ccan/build_assert/build_assert.h: added as a dependency of list.h
* ccan/check_type/check_type.h: ditto
* ccan/container_of/container_of.h: ditto
* ccan/licenses/BSD-MIT: ditto
* ccan/licenses/CC0: ditto
* ccan/str/str.h: ditto (stripped of unused macros)
* ccan/list/list.h: ditto
* common.mk: add CCAN_LIST_INCLUDES
  [ruby-core:61871][Feature 9632 (part 1)]

Apologies for the size of this commit, but I think a good
doubly-linked list will be useful for future features, too.
This may be used to add ordering to a container_of-based hash
table to preserve compatibility if required (e.g. feature 9614).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45914 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
vm.c: suppress a warning

* vm.c (rb_vm_living_threads_foreach): suppress "uninitialized"
  warning where "typeof" is unavailable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45915 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: check typeof

* configure.in (rb_cv_typeof): check typeof extension for ccan
  headers.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
signal.c: directly deliver non-handlable signals

* signal.c (rb_f_kill): directly deliver signals which cannot be
  handled, i.e., SIGKILL and SIGSTOP.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45917 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_process.rb: WIFEXITED and so on are system dependent

* test/ruby/test_process.rb (test_status_kill): WIFEXITED and so
  on are available only if signal is supported by the system.
  [ruby-dev:48203] [Bug #9820]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45918 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_process.rb: duplicate assertions

* test/ruby/test_process.rb (test_status_{kill,quit}): remove
  duplicate assertions

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* pack.c (swaps): Unused macro removed.
  (swapi): Ditto.
  (swapl): Ditto.
  (swapll): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45920 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* compile.c (BUFSIZE): Unused macro removed.

* vm.c (BUFSIZE): Ditto.

* pack.c (INT64toNUM): Ditto.
  (UINT64toNUM): Ditto.
  (BYTEWIDTH): Ditto.

* time.c (lshift): Ditto.
  (UINT64toNUM): Ditto.
  (id_lshift): Unused variable removed.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45921 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/socket/ifaddr.c (IS_IFADDRS): Unused macro removed.

* ext/strscan/strscan.c (BUFSIZE): Ditto.

* ext/zlib/zlib.c (OBJ_IS_FREED): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45922 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-05-12

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45923 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
signal.c: check the next page too

* signal.c (check_stack_overflow): check the next page too.  SP in
  ucontext is not decremented yet when `push` failed, so the fault
  page can be the next.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45924 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* gc.c: count young object correctly and show it in GC.stat
  on RGENGC_AGE2_PROMOTION.
* gc.c (RVALUE_PROMOTE_YOUNG): decrement young object count on
  YOUNG->OLD.
* gc.c (obj_free): decrement young object count when young object
  freed.
* gc.c (gc_marks): should not clear young object count.
* gc.c (gc_stat_internal): GC.stat :young_object information.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* configure.in: Invoke AC_REPLACE_FUNCS for each function.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45926 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: check atan2

* configure.in (rb_cv_atan2_inf_c99): check whether runtime atan2
  handles Inf as C99.  ruby-core:62536] [Bug #9831]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45930 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ChangeLog: fix a typo for r45930.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e