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introduce rb_nogvl C-API to mark ubf as async-signal-safe

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zlib and bignum both contain unblocking functions which are
async-signal-safe and do not require spawning additional
threads.

We can execute those functions directly in signal handlers
without incurring overhead of extra threads, so provide C-API
users the ability to deal with that.  Other C-API users may
have similar need.

This flexible API can supercede existing uses of
rb_thread_call_without_gvl and rb_thread_call_without_gvl2 by
introducing a flags argument to control behavior.

Note: this API is NOT finalized.  It needs approval from other
committers.  I prefer shorter name than previous
rb_thread_call_without_gvl* functions because my eyes requires
big fonts.

[Bug #15499]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66712 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2019-01-04 13:14:11 +00:00
parent 16cfd26a57
commit 23444302d9
8 changed files with 103 additions and 11 deletions
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12
include/ruby/thread.h
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@ -21,6 +21,10 @@ extern "C" {
#include "ruby/intern.h"
/* flags for rb_nogvl */
#define RB_NOGVL_INTR_FAIL (0x1)
#define RB_NOGVL_UBF_ASYNC_SAFE (0x2)
RUBY_SYMBOL_EXPORT_BEGIN
void *rb_thread_call_with_gvl(void *(*func)(void *), void *data1);
@ -30,6 +34,14 @@ void *rb_thread_call_without_gvl(void *(*func)(void *), void *data1,
void *rb_thread_call_without_gvl2(void *(*func)(void *), void *data1,
rb_unblock_function_t *ubf, void *data2);
/*
* XXX: unstable/unapproved - out-of-tree code should NOT not depend
* on this until it hits Ruby 2.6.1
*/
void *rb_nogvl(void *(*func)(void *), void *data1,
rb_unblock_function_t *ubf, void *data2,
int flags);
#define RUBY_CALL_WO_GVL_FLAG_SKIP_CHECK_INTS_AFTER 0x01
#define RUBY_CALL_WO_GVL_FLAG_SKIP_CHECK_INTS_