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🧵 Concurrent::ThreadLocalVar < ThreadLocalVarImplementation

📝 NAME

Concurrent::ThreadLocalVar — A thread-local variable with per‑thread values.

🚀 Quick Reference

Use Case	Command	Description
Create a thread‑local variable with default value	ThreadLocalVar.new(14)	Initializes a new variable; each thread sees the default value unless modified.
Read current thread’s value	v.value	Returns the value for the calling thread.
Set current thread’s value	v.value = 2	Changes the value only for the current thread; other threads are unaffected.
Demonstrate isolation across threads	Thread.new { v.value = 1 }	Each thread can independently modify its own copy of the variable.

📖 DESCRIPTION

A 🧵 ThreadLocalVar is a variable where the value is different for each thread. Each variable may have a default value, but when you modify the variable only the current thread will ever see that change.

💡 EXAMPLES

🔹 Basic usage

v = ThreadLocalVar.new(14)
v.value #=> 14
v.value = 2
v.value #=> 2

🔹 Thread isolation

v = ThreadLocalVar.new(14)

t1 = Thread.new do
  v.value #=> 14
  v.value = 1
  v.value #=> 1
end

t2 = Thread.new do
  v.value #=> 14
  v.value = 2
  v.value #=> 2
end

v.value #=> 14

🔗 SEE ALSO

• Java ThreadLocal — The original Java equivalent.

🧵 Concurrent::ThreadLocalVar < ThreadLocalVarImplementation 📝 NAME 🚀 Quick Reference 📖 DESCRIPTION 💡 EXAMPLES 🔗 SEE ALSO