mirror of
https://github.com/ruby/ruby.git
synced 2026-01-27 04:24:23 +00:00
eab7f4623f
StackProf uses a signal handler to call `rb_profile_frames`. Signals are delivered to threads randomly, and can be delivered after the thread has been created but before the CFP has been established on the EC. This commit returns early if there is no CFP to use. Here is some info from the core files we are seeing. Here you can see the CFP on the current EC is 0x0: ``` (gdb) p ruby_current_ec $20 = (struct rb_execution_context_struct *) 0x7f3481301b50 (gdb) p ruby_current_ec->cfp $21 = (rb_control_frame_t *) 0x0 ``` Here is where VM_FRAME_CFRAME_P gets a 0x0 CFP: ``` 6 VM_FRAME_CFRAME_P (cfp=0x0) at vm_core.h:1350 7 VM_FRAME_RUBYFRAME_P (cfp=<optimized out>) at vm_core.h:1350 8 rb_profile_frames (start=0, limit=2048, buff=0x7f3493809590, lines=0x7f349380d590) at vm_backtrace.c:1587 ``` Down the stack we can see this is happening after thread creation: ``` 19 0x00007f3495bf9420 in <signal handler called> () at /lib/x86_64-linux-gnu/libpthread.so.0 20 0x000055d531574e55 in thread_start_func_2 (th=<optimized out>, stack_start=<optimized out>) at thread.c:676 21 0x000055d531575b31 in thread_start_func_1 (th_ptr=<optimized out>) at thread_pthread.c:1170 22 0x00007f3495bed609 in start_thread (arg=<optimized out>) at pthread_create.c:477 23 0x00007f3495b12133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 ```
What is Ruby?
Ruby is an interpreted object-oriented programming language often used for web development. It also offers many scripting features to process plain text and serialized files, or manage system tasks. It is simple, straightforward, and extensible.
Features of Ruby
- Simple Syntax
- Normal Object-oriented Features (e.g. class, method calls)
- Advanced Object-oriented Features (e.g. mix-in, singleton-method)
- Operator Overloading
- Exception Handling
- Iterators and Closures
- Garbage Collection
- Dynamic Loading of Object Files (on some architectures)
- Highly Portable (works on many Unix-like/POSIX compatible platforms as well as Windows, macOS, etc.) cf. https://github.com/ruby/ruby/blob/master/doc/maintainers.rdoc#label-Platform+Maintainers
How to get Ruby with Git
For a complete list of ways to install Ruby, including using third-party tools like rvm, see:
https://www.ruby-lang.org/en/downloads/
The mirror of the Ruby source tree can be checked out with the following command:
$ git clone https://github.com/ruby/ruby.git
There are some other branches under development. Try the following command to see the list of branches:
$ git ls-remote https://github.com/ruby/ruby.git
You may also want to use https://git.ruby-lang.org/ruby.git (actual master of Ruby source) if you are a committer.
How to build
see Building Ruby
Ruby home page
Documentation
Mailing list
There is a mailing list to discuss Ruby. To subscribe to this list, please send the following phrase:
subscribe
in the mail body (not subject) to the address ruby-talk-request@ruby-lang.org.
Copying
See the file COPYING.
Feedback
Questions about the Ruby language can be asked on the Ruby-Talk mailing list or on websites like https://stackoverflow.com.
Bugs should be reported at https://bugs.ruby-lang.org. Read "Reporting Issues" for more information.
Contributing
See "Contributing to Ruby", which includes setup and build instructions.
The Author
Ruby was originally designed and developed by Yukihiro Matsumoto (Matz) in 1995.