rfc:deprecate_ticks

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rfc:deprecate_ticks [2021/05/11 09:30] – nikicrfc:deprecate_ticks [2025/04/03 13:08] (current) – external edit 127.0.0.1
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   * Date: 2021-05-11   * Date: 2021-05-11
   * Author: Nikita Popov <nikic@php.net>   * Author: Nikita Popov <nikic@php.net>
-  * Status: Under Discussion+  * Status: Withdrawn
   * Target Version: PHP 8.1   * Target Version: PHP 8.1
   * Implementation: https://github.com/php/php-src/pull/6967   * Implementation: https://github.com/php/php-src/pull/6967
 +  * Discussion: https://externals.io/message/114368
  
 ===== Introduction ===== ===== Introduction =====
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 Async signals work by setting a VM interrupt flag whenever a signal is received, which will be handled at the next VM interrupt check. This means that async signals do not impose any additional cost, beyond what is always paid to handle timeouts. Async signals work by setting a VM interrupt flag whenever a signal is received, which will be handled at the next VM interrupt check. This means that async signals do not impose any additional cost, beyond what is always paid to handle timeouts.
- 
-Beyond signal handling, I'm not aware of other applications of the ticks mechanism that are still in use today. 
  
 ===== Proposal ===== ===== Proposal =====
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 The removal of the ticks mechanism is expected to have limited impact. The primary user of ticks were pcntl signals, and these are handled through [[https://www.php.net/pcntl_async_signals|async signals]] nowadays. The removal of the ticks mechanism is expected to have limited impact. The primary user of ticks were pcntl signals, and these are handled through [[https://www.php.net/pcntl_async_signals|async signals]] nowadays.
 +
 +It is possible to use ticks to instrument all code by overriding PHP's file stream wrapper and rewriting all included files to add the ''declare(ticks=N)'' directive. Apparently, there are people who use such an approach to monitor performance and memory usage of code.
  
 ===== Vote ===== ===== Vote =====
  
 Yes/No. Yes/No.
rfc/deprecate_ticks.1620725402.txt.gz · Last modified: 2025/04/03 13:08 (external edit)

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