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simplify altstack and enable reuse with thread cache

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Instead of allocating and registering the altstack in different
places, do it together to reduce code and improve readability.
When thread cache is enabled, storing altstack in rb_thread_t
is wasteful and we may reuse altstack in the same pthread.

This also lets us clearly allow use of xmalloc to allow GC to
recover from ENOMEM.

[ruby-core:85621] [Feature #14487]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63213 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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normal 2018-04-20 21:38:27 +00:00
parent e72a86fc93
commit 475b4aa40b
7 changed files with 20 additions and 38 deletions
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internal.h
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@ -1704,7 +1704,6 @@ int rb_match_nth_defined(int nth, VALUE match);
/* signal.c */
extern int ruby_enable_coredump;
int rb_get_next_signal(void);
int rb_sigaltstack_size(void);
/* st.c */
extern void rb_hash_bulk_insert(long, const VALUE *, VALUE);