rfc:fiber

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Last revision Both sides next revision
rfc:fiber [2018/04/18 22:30]
lvht
rfc:fiber [2018/06/10 13:54]
lvht
Line 3: Line 3:
   * Date: 2017-09-13   * Date: 2017-09-13
   * Author: Haitao Lv<i@lvht.net>, Dmitry Stogov<dmitry@zend.com>, Martin Schröder<m.schroeder2007@googlemail.com>   * Author: Haitao Lv<i@lvht.net>, Dmitry Stogov<dmitry@zend.com>, Martin Schröder<m.schroeder2007@googlemail.com>
-  * Status: Under Discussion+  * Status: Voting
   * First Published at: http://wiki.php.net/rfc/fiber   * First Published at: http://wiki.php.net/rfc/fiber
  
Line 82: Line 82:
 === Implementation Detail === === Implementation Detail ===
 In our simple implementation, we only backup/restore the **zend stack**. We **cannot** pause a Fiber during internal function call like `array_map`. In our simple implementation, we only backup/restore the **zend stack**. We **cannot** pause a Fiber during internal function call like `array_map`.
- 
-However, backup/restore both the zend stack and the the c statck is impossible. 
-Martin Schröder is working on this at https://github.com/fiberphp/fiber-ext/pull/30. 
- 
-^Property^Martin's Fiber^Our Fiber^ 
-|Code Base|Complicated|Simple| 
-|Minimum Memory Usage|VM stack only (4 KB)|VM & C stack (4 KB + 4 KB)| 
-|Supported Architecturs|any platform|x86 at this time| 
-|Yield in Internal Function|unsupported|supported| 
  
 ===== Backward Incompatible Changes ===== ===== Backward Incompatible Changes =====
Line 116: Line 107:
  
 ===== Open Issues ===== ===== Open Issues =====
 +<blockquote>Why not support backup/restore the c stack?</blockquote>
 +Martin Schröder is working on this at https://github.com/fiberphp/fiber-ext/pull/30. 
 +
 +And here is the comparison.
 +^Property^Stackless Fiber^Native Fiber^
 +|1 Minimum Memory Usage|VM stack only (4 KB)|VM & C stack (4 KB + 4 KB)|
 +|2 Supported Architecturs|any platform|x86 at this time|
 +|3 Yield in Internal Function|unsupported|supported|
 +|4 Yield in Iterator|unsupported|supported|
 +
 +Stackless fiber use less memory and are not platform-dependend (1 & 2) which makes them very portable and efficient. They do however lack support for anything that involves internal function calls (3) including opcode handlers (4, e.g. foreach loop).
 +
 +Native fibers are very platform-dependend (2) and use more memory because they do need to allocate a C call stack (1). While memory allocation will be done using mmap() it will still reserve virtual memory (can be problematic for a large number of fibers on 32 bit systems due to limited virtual memory addressing). The big advantage is that all kinds of internal function call (3 & 4) are supported without any changes to the existing codebase.
 +
 <blockquote>Why not introduce helper like **Fiber::alive(),Fiber::running()**?</blockquote> <blockquote>Why not introduce helper like **Fiber::alive(),Fiber::running()**?</blockquote>
  
Line 123: Line 128:
  
 Both Ruby's Fiber and Lua's coroutine using the same **resume()** API to **init** and **resume** their coroutine. Both Ruby's Fiber and Lua's coroutine using the same **resume()** API to **init** and **resume** their coroutine.
- 
-<blockquote>Why not introduce keyword like async/await?</blockquote> 
- 
-Introducing new keywords will cause BC impact. Both Ruby's Fiber and Lua's coroutine does not have such keyword as well. 
  
 ===== Unaffected PHP Functionality ===== ===== Unaffected PHP Functionality =====
Line 132: Line 133:
  
 ===== Future Scope ===== ===== Future Scope =====
-This sections details areas where the feature might be improved in future, but that are not currently proposed in this RFC.+ 
 +Syntax like async/await can be implemented in the future, but it's out of the scope of this RFC.
  
 ===== Proposed Voting Choices ===== ===== Proposed Voting Choices =====
 2/3+1 voting majority 2/3+1 voting majority
 +<doodle title="RFC name here" auth="your_username_here" voteType="single" closed="false">
 +   * Yes
 +   * No
 +</doodle>
  
 ===== Patches and Tests ===== ===== Patches and Tests =====
rfc/fiber.txt · Last modified: 2018/06/12 07:40 by krakjoe