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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
This commit is contained in:
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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14
vm_core.h
View file

@ -101,7 +101,13 @@
#endif
#if defined(SIGSEGV) && defined(HAVE_SIGALTSTACK) && defined(SA_SIGINFO) && !defined(__NetBSD__)
#define USE_SIGALTSTACK
# define USE_SIGALTSTACK
void *rb_register_sigaltstack(void);
# define RB_ALTSTACK_INIT(var) var = rb_register_sigaltstack()
# define RB_ALTSTACK_FREE(var) xfree(var)
#else /* noop */
# define RB_ALTSTACK_INIT(var)
# define RB_ALTSTACK_FREE(var)
#endif
/*****************/
@ -538,6 +544,9 @@ typedef struct rb_vm_struct {
struct rb_thread_struct *main_thread;
struct rb_thread_struct *running_thread;
#ifdef USE_SIGALTSTACK
void *main_altstack;
#endif
rb_serial_t fork_gen;
struct list_head waiting_fds; /* <=> struct waiting_fd */
@ -883,9 +892,6 @@ typedef struct rb_thread_struct {
/* misc */
unsigned int abort_on_exception: 1;
unsigned int report_on_exception: 1;
#ifdef USE_SIGALTSTACK
void *altstack;
#endif
uint32_t running_time_us; /* 12500..800000 */
VALUE name;
} rb_thread_t;