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author | nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-07-09 20:46:10 +0000 |
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committer | nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-07-09 20:46:10 +0000 |
commit | 5e645629f3c4dc16931f0c1635565f875b02e12c (patch) | |
tree | 1e71de1ac909640d42279e80ff6436a9d2a10f07 | |
parent | e15f61a0d2ef6656958f5f63498323ff3185a78e (diff) |
merge revision(s) 58696: [Backport #11384]
autoload: always wait on loading thread
We cannot assume autoload_provided/rb_feature_provided returning
TRUE means it is safe to proceed without waiting. Another
thread may call rb_provide_feature before setting the constant
(via autoload_const_set). So we must wait until autoload is
completed by another thread.
Note: this patch was tested with an explicit rb_thread_schedule
in rb_provide_feature to make the race condition more apparent
as suggested by <s.wanabe@gmail.com>:
> --- a/load.c
> +++ b/load.c
> @@ -563,6 +563,7 @@ rb_provide_feature(VALUE feature)
> rb_str_freeze(feature);
>
> rb_ary_push(features, rb_fstring(feature));
> +rb_thread_schedule();
> features_index_add(feature, INT2FIX(RARRAY_LEN(features)-1));
> reset_loaded_features_snapshot();
> }
* variable.c (check_autoload_required): do not assume a provided
feature means autoload is complete, always wait if autoload is
being performed by another thread.
[ruby-core:81105] [Bug #11384] Thanks to <s.wanabe@gmail.com>
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59303 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
-rw-r--r-- | variable.c | 11 | ||||
-rw-r--r-- | version.h | 2 |
2 files changed, 12 insertions, 1 deletions
diff --git a/variable.c b/variable.c index 7f8cef94e0..8e11b4086d 100644 --- a/variable.c +++ b/variable.c @@ -2034,6 +2034,17 @@ check_autoload_required(VALUE mod, ID id, const char **loadingpath) if (!RSTRING_LEN(file) || !*RSTRING_PTR(file)) { rb_raise(rb_eArgError, "empty file name"); } + + /* + * if somebody else is autoloading, we MUST wait for them, since + * rb_provide_feature can provide a feature before autoload_const_set + * completes. We must wait until autoload_const_set finishes in + * the other thread. + */ + if (ele->state && ele->state->thread != rb_thread_current()) { + return load; + } + loading = RSTRING_PTR(file); safe = rb_safe_level(); rb_set_safe_level_force(0); @@ -1,6 +1,6 @@ #define RUBY_VERSION "2.4.2" #define RUBY_RELEASE_DATE "2017-07-10" -#define RUBY_PATCHLEVEL 143 +#define RUBY_PATCHLEVEL 144 #define RUBY_RELEASE_YEAR 2017 #define RUBY_RELEASE_MONTH 7 |