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Filename : cdesc-Fiber.ri
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U:RDoc::NormalClass[iI"
Fiber:ET@I"Object;To:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[
I"EFibers are primitives for implementing light weight cooperative ;TI"Mconcurrency in Ruby. Basically they are a means of creating code blocks ;TI"Lthat can be paused and resumed, much like threads. The main difference ;TI"Nis that they are never preempted and that the scheduling must be done by ;TI"#the programmer and not the VM.;To:RDoc::Markup::BlankLine�o;	;[	I"OAs opposed to other stackless light weight concurrency models, each fiber ;TI"Jcomes with a stack.  This enables the fiber to be paused from deeply ;TI"Dnested function calls within the fiber block.  See the ruby(1) ;TI"9manpage to configure the size of the fiber stack(s).;T@o;	;[
I"KWhen a fiber is created it will not run automatically. Rather it must ;TI"Lbe explicitly asked to run using the <code>Fiber#resume</code> method. ;TI"FThe code running inside the fiber can give up control by calling ;TI"M<code>Fiber.yield</code> in which case it yields control back to caller ;TI"3(the caller of the <code>Fiber#resume</code>).;T@o;	;[I"JUpon yielding or termination the Fiber returns the value of the last ;TI"executed expression;T@o;	;[I"For instance:;T@o:RDoc::Markup::Verbatim;[
I"fiber = Fiber.new do
;TI"  Fiber.yield 1
;TI"	  2
;TI"	end
;TI"
;TI"puts fiber.resume
;TI"puts fiber.resume
;TI"puts fiber.resume
;T:@format0o;	;[I"<em>produces</em>;T@o;;[I"1
;TI"2
;TI"#FiberError: dead fiber called
;T;0o;	;[	I"IThe <code>Fiber#resume</code> method accepts an arbitrary number of ;TI"Jparameters, if it is the first call to <code>resume</code> then they ;TI"Jwill be passed as block arguments. Otherwise they will be the return ;TI"2value of the call to <code>Fiber.yield</code>;T@o;	;[I"
Example:;T@o;;[I""fiber = Fiber.new do |first|
;TI"&  second = Fiber.yield first + 2
;TI"	end
;TI"
;TI"puts fiber.resume 10
;TI"puts fiber.resume 14
;TI"puts fiber.resume 18
;T;0o;	;[I"<em>produces</em>;T@o;;[I"12
;TI"14
;TI""FiberError: dead fiber called;T;0:
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