SecureRandom lazily defines `get_random`. Accessing the mutex to define
the `get_random` method is not supported inside a Ractor. This commit
defines `gen_random` when `securerandom` is required and makes it
suppore Ractor (as well as thread safe).
Here is a test program:
```ruby
require "securerandom"
r = Ractor.new do
loop do
Ractor.yield SecureRandom.hex
end
end
p r.take
```
Before this commit:
```
$ make runruby
./miniruby -I./lib -I. -I.ext/common ./tool/runruby.rb --extout=.ext -- --disable-gems ./test.rb
<internal:ractor>:38: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
/Users/aaron/git/ruby/lib/securerandom.rb:94:in `gen_random': can not access instance variables of classes/modules from non-main Ractors (RuntimeError)
<internal:ractor>:124:in `take': thrown by remote Ractor. (Ractor::RemoteError)
from ./test.rb:9:in `<main>'
/Users/aaron/git/ruby/lib/securerandom.rb:94:in `gen_random': can not access instance variables of classes/modules from non-main Ractors (RuntimeError)
from /Users/aaron/git/ruby/lib/securerandom.rb:155:in `random_bytes'
from /Users/aaron/git/ruby/lib/securerandom.rb:176:in `hex'
from ./test.rb:5:in `block (2 levels) in <main>'
from ./test.rb:4:in `loop'
from ./test.rb:4:in `block in <main>'
make: *** [runruby] Error
```
After this commit:
```
$ make runruby
./miniruby -I./lib -I. -I.ext/common ./tool/runruby.rb --extout=.ext -- --disable-gems ./test.rb
<internal:ractor>:38: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
"3fc8885157e3911bab4b5d7619bb0308"
```
This is useful to see what a block of code allocated, e.g.
```
GC.start
GC.disable
ObjectSpace.trace_object_allocations do
# run some code
end
gc_gen = GC.count
allocations = ObjectSpace.dump_all(output: :file, since: gc_gen)
GC.enable
GC.start
retentions = ObjectSpace.dump_all(output: :file, since: gc_gen)
```
Added `WITH_REAL` versions to `RB_RANDOM_INTERFACE` macros. Also
these macros including "without real" versions no longer contain
the terminator (semicolon and comma).
* random.c: separate abstract rb_random_t and rb_random_mt_t for
Mersenne Twister implementation.
* include/ruby/random.h: the interface for extensions of Random
class.
* DLL imported symbol reference is not constant on Windows.
* check if properly initialized.
A backtrace object in an exception had never supported marshalling
correctly: `Marshal.load(Marshal.dump(exc)).backtrace_locations` dumped
core.
An Exception object has two hidden instance varibles for backtrace data:
one is "bt", which has an Array of Strings, and the other is
"bt_locations", which has an Array of Thread::Backtrace::Locations.
However, Exception's dump outputs data so that the two variables are the
same Array of Strings. Thus, "bt_locations" had a wrong-type object.
For the compatibility, it is difficult to change the dump format. This
changeset fixes the issue by ignoring data for "bt_locations" at the
loading phase if "bt_locations" refers to the same object as "bt".
Future work: Exception's dump should output "bt_locations"
appropriately.
https://bugs.ruby-lang.org/issues/17150
