* [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors
@ 2020-10-20 1:47 ko1
2020-10-22 14:56 ` [ruby-core:100505] " daniel
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: ko1 @ 2020-10-20 1:47 UTC (permalink / raw)
To: ruby-core
Issue #17268 has been reported by ko1 (Koichi Sasada).
----------------------------------------
Bug #17268: special global variables which can be accessed from ractors
https://bugs.ruby-lang.org/issues/17268
* Author: ko1 (Koichi Sasada)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Ractors can't access global variables, but some special global variables should be accessed.
There are several types.
## Proposal
(1) Read-only global variables
```ruby
# process-local (readonly): other commandline parameters
'$-p' => $-p,
'$-l' => $-l,
'$-a' => $-a,
# process-local (readonly): getpid
'$$' => $$,
```
(2) scope local variables
```ruby
# thread local: process result
'$?' => $?,
# scope local: match
'$~' => $~.inspect,
'$&' => $&,
'$`' => $`,
'$\'' => $',
'$+' => $+,
'$1' => $1,
# scope local: last line
'$_' => $_,
# scope local: last backtrace
'$@' => $@,
'$!' => $!,
```
(3) Ractor local variables
```ruby
# ractor-local (derived from created ractor): debug
'$DEBUG' => $DEBUG,
'$-d' => $-d,
# ractor-local (derived from created ractor): verbose
'$VERBOSE' => $VERBOSE,
'$-w' => $-w,
'$-W' => $-W,
'$-v' => $-v,
# ractor local: stdin, out, err
'$stdin' => $stdin.inspect,
'$stdout' => $stdout.inspect,
'$stderr' => $stderr.inspect,
```
Implementation:
I'll merge it soon.
## Discussion
* only accessible from main ractor?
* `$0`:
* ARGV, ARGF, `$.`
* only accessible from main ractor because they will be obsolete
* `$, $/ $; $\`
* So difficult: `$" / $LOADED_FEATURES` and `$: / $LOAD_PATH`
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
* [ruby-core:100505] [Ruby master Bug#17268] special global variables which can be accessed from ractors
2020-10-20 1:47 [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors ko1
@ 2020-10-22 14:56 ` daniel
2020-10-22 19:31 ` [ruby-core:100509] " eregontp
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: daniel @ 2020-10-22 14:56 UTC (permalink / raw)
To: ruby-core
Issue #17268 has been updated by Dan0042 (Daniel DeLorme).
Why can't ractors access global variables? Shouldn't it be like constants, where a frozen/shareable object can be accessed?
```ruby
$x = [1,2,3]
Ractor.new{ $x }.take # I understand that this can't work
$x = true
Ractor.new{ $x }.take # but why is this not ok?
```
----------------------------------------
Bug #17268: special global variables which can be accessed from ractors
https://bugs.ruby-lang.org/issues/17268#change-88127
* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Ractors can't access global variables, but some special global variables should be accessed.
There are several types.
## Proposal
(1) Read-only global variables
```ruby
# process-local (readonly): other commandline parameters
'$-p' => $-p,
'$-l' => $-l,
'$-a' => $-a,
# process-local (readonly): getpid
'$$' => $$,
```
(2) scope local variables
```ruby
# thread local: process result
'$?' => $?,
# scope local: match
'$~' => $~.inspect,
'$&' => $&,
'$`' => $`,
'$\'' => $',
'$+' => $+,
'$1' => $1,
# scope local: last line
'$_' => $_,
# scope local: last backtrace
'$@' => $@,
'$!' => $!,
```
(3) Ractor local variables
```ruby
# ractor-local (derived from created ractor): debug
'$DEBUG' => $DEBUG,
'$-d' => $-d,
# ractor-local (derived from created ractor): verbose
'$VERBOSE' => $VERBOSE,
'$-w' => $-w,
'$-W' => $-W,
'$-v' => $-v,
# ractor local: stdin, out, err
'$stdin' => $stdin.inspect,
'$stdout' => $stdout.inspect,
'$stderr' => $stderr.inspect,
```
Implementation: https://github.com/ruby/ruby/pull/3670
I'll merge it soon.
## Discussion
* only accessible from main ractor?
* `$0`:
* ARGV, ARGF, `$.`
* only accessible from main ractor because they will be obsolete
* `$, $/ $; $\`
* So difficult: `$" / $LOADED_FEATURES` and `$: / $LOAD_PATH`
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
* [ruby-core:100509] [Ruby master Bug#17268] special global variables which can be accessed from ractors
2020-10-20 1:47 [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors ko1
2020-10-22 14:56 ` [ruby-core:100505] " daniel
@ 2020-10-22 19:31 ` eregontp
2020-10-22 21:18 ` [ruby-core:100510] " daniel
2020-10-26 16:36 ` [ruby-core:100583] " ko1
3 siblings, 0 replies; 5+ messages in thread
From: eregontp @ 2020-10-22 19:31 UTC (permalink / raw)
To: ruby-core
Issue #17268 has been updated by Eregon (Benoit Daloze).
I think this issue is mostly about "special" global variables, not so much about "regular" global variables.
I wonder if "regular" global variables should be Ractor-local, or behave like constants.
Since most of the above became Ractor-local (instead of per-Process before) or a narrower scope, I think Ractor-local would make most sense.
The only special variables that are still process-local are read-only, which means it's the same as if they were Ractor-local read-only.
----------------------------------------
Bug #17268: special global variables which can be accessed from ractors
https://bugs.ruby-lang.org/issues/17268#change-88132
* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Ractors can't access global variables, but some special global variables should be accessed.
There are several types.
## Proposal
(1) Read-only global variables
```ruby
# process-local (readonly): other commandline parameters
'$-p' => $-p,
'$-l' => $-l,
'$-a' => $-a,
# process-local (readonly): getpid
'$$' => $$,
```
(2) scope local variables
```ruby
# thread local: process result
'$?' => $?,
# scope local: match
'$~' => $~.inspect,
'$&' => $&,
'$`' => $`,
'$\'' => $',
'$+' => $+,
'$1' => $1,
# scope local: last line
'$_' => $_,
# scope local: last backtrace
'$@' => $@,
'$!' => $!,
```
(3) Ractor local variables
```ruby
# ractor-local (derived from created ractor): debug
'$DEBUG' => $DEBUG,
'$-d' => $-d,
# ractor-local (derived from created ractor): verbose
'$VERBOSE' => $VERBOSE,
'$-w' => $-w,
'$-W' => $-W,
'$-v' => $-v,
# ractor local: stdin, out, err
'$stdin' => $stdin.inspect,
'$stdout' => $stdout.inspect,
'$stderr' => $stderr.inspect,
```
Implementation: https://github.com/ruby/ruby/pull/3670
I'll merge it soon.
## Discussion
* only accessible from main ractor?
* `$0`:
* ARGV, ARGF, `$.`
* only accessible from main ractor because they will be obsolete
* `$, $/ $; $\`
* So difficult: `$" / $LOADED_FEATURES` and `$: / $LOAD_PATH`
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
* [ruby-core:100510] [Ruby master Bug#17268] special global variables which can be accessed from ractors
2020-10-20 1:47 [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors ko1
2020-10-22 14:56 ` [ruby-core:100505] " daniel
2020-10-22 19:31 ` [ruby-core:100509] " eregontp
@ 2020-10-22 21:18 ` daniel
2020-10-26 16:36 ` [ruby-core:100583] " ko1
3 siblings, 0 replies; 5+ messages in thread
From: daniel @ 2020-10-22 21:18 UTC (permalink / raw)
To: ruby-core
Issue #17268 has been updated by Dan0042 (Daniel DeLorme).
Eregon (Benoit Daloze) wrote in #note-4:
> I wonder if "regular" global variables should be Ractor-local, or behave like constants.
I wouldn't mind either way. Although if Ractor-local I would hope they are derived from created ractor, like $DEBUG and $VERBOSE.
----------------------------------------
Bug #17268: special global variables which can be accessed from ractors
https://bugs.ruby-lang.org/issues/17268#change-88133
* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Ractors can't access global variables, but some special global variables should be accessed.
There are several types.
## Proposal
(1) Read-only global variables
```ruby
# process-local (readonly): other commandline parameters
'$-p' => $-p,
'$-l' => $-l,
'$-a' => $-a,
# process-local (readonly): getpid
'$$' => $$,
```
(2) scope local variables
```ruby
# thread local: process result
'$?' => $?,
# scope local: match
'$~' => $~.inspect,
'$&' => $&,
'$`' => $`,
'$\'' => $',
'$+' => $+,
'$1' => $1,
# scope local: last line
'$_' => $_,
# scope local: last backtrace
'$@' => $@,
'$!' => $!,
```
(3) Ractor local variables
```ruby
# ractor-local (derived from created ractor): debug
'$DEBUG' => $DEBUG,
'$-d' => $-d,
# ractor-local (derived from created ractor): verbose
'$VERBOSE' => $VERBOSE,
'$-w' => $-w,
'$-W' => $-W,
'$-v' => $-v,
# ractor local: stdin, out, err
'$stdin' => $stdin.inspect,
'$stdout' => $stdout.inspect,
'$stderr' => $stderr.inspect,
```
Implementation: https://github.com/ruby/ruby/pull/3670
I'll merge it soon.
## Discussion
* only accessible from main ractor?
* `$0`:
* ARGV, ARGF, `$.`
* only accessible from main ractor because they will be obsolete
* `$, $/ $; $\`
* So difficult: `$" / $LOADED_FEATURES` and `$: / $LOAD_PATH`
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
* [ruby-core:100583] [Ruby master Bug#17268] special global variables which can be accessed from ractors
2020-10-20 1:47 [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors ko1
` (2 preceding siblings ...)
2020-10-22 21:18 ` [ruby-core:100510] " daniel
@ 2020-10-26 16:36 ` ko1
3 siblings, 0 replies; 5+ messages in thread
From: ko1 @ 2020-10-26 16:36 UTC (permalink / raw)
To: ruby-core
Issue #17268 has been updated by ko1 (Koichi Sasada).
The proposal is accepted.
> I wonder if "regular" global variables should be Ractor-local, or behave like constants.
This is rejected at first by Matz (my original proposal is making all $gvars are ractor-local), to avoid confusion.
----------------------------------------
Bug #17268: special global variables which can be accessed from ractors
https://bugs.ruby-lang.org/issues/17268#change-88215
* Author: ko1 (Koichi Sasada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Ractors can't access global variables, but some special global variables should be accessed.
There are several types.
## Proposal
(1) Read-only global variables
```ruby
# process-local (readonly): other commandline parameters
'$-p' => $-p,
'$-l' => $-l,
'$-a' => $-a,
# process-local (readonly): getpid
'$$' => $$,
```
(2) scope local variables
```ruby
# thread local: process result
'$?' => $?,
# scope local: match
'$~' => $~.inspect,
'$&' => $&,
'$`' => $`,
'$\'' => $',
'$+' => $+,
'$1' => $1,
# scope local: last line
'$_' => $_,
# scope local: last backtrace
'$@' => $@,
'$!' => $!,
```
(3) Ractor local variables
```ruby
# ractor-local (derived from created ractor): debug
'$DEBUG' => $DEBUG,
'$-d' => $-d,
# ractor-local (derived from created ractor): verbose
'$VERBOSE' => $VERBOSE,
'$-w' => $-w,
'$-W' => $-W,
'$-v' => $-v,
# ractor local: stdin, out, err
'$stdin' => $stdin.inspect,
'$stdout' => $stdout.inspect,
'$stderr' => $stderr.inspect,
```
Implementation: https://github.com/ruby/ruby/pull/3670
I'll merge it soon.
## Discussion
* only accessible from main ractor?
* `$0`:
* ARGV, ARGF, `$.`
* only accessible from main ractor because they will be obsolete
* `$, $/ $; $\`
* So difficult: `$" / $LOADED_FEATURES` and `$: / $LOAD_PATH`
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-10-20 1:47 [ruby-core:100439] [Ruby master Bug#17268] special global variables which can be accessed from ractors ko1
2020-10-22 14:56 ` [ruby-core:100505] " daniel
2020-10-22 19:31 ` [ruby-core:100509] " eregontp
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