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93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 7 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2018 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Kalle Sommer Nielsen <kalle@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include <php.h>
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#include "nice.h"
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/*
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* Basic Windows implementation for the nice() function.
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*
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* This implementation uses SetPriorityClass() as a backend for defining
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* a process priority.
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*
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* The following values of inc, defines the value sent to SetPriorityClass():
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*
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* +-----------------------+-----------------------------+
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* | Expression | Priority type |
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* +-----------------------+-----------------------------+
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* | priority < -9 | HIGH_PRIORITY_CLASS |
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* +-----------------------+-----------------------------+
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* | priority < -4 | ABOVE_NORMAL_PRIORITY_CLASS |
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* +-----------------------+-----------------------------+
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* | priority > 4 | BELOW_NORMAL_PRIORITY_CLASS |
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* +-----------------------+-----------------------------+
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* | priority > 9 | IDLE_PRIORITY_CLASS |
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* +-----------------------+-----------------------------+
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*
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* If a value is between -4 and 4 (inclusive), then the priority will be set
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* to NORMAL_PRIORITY_CLASS.
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*
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* These values tries to mimic that of the UNIX version of nice().
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*
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* This is applied to the main process, not per thread, although this could
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* be implemented using SetThreadPriority() at one point.
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*
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* Note, the following priority classes are left out with intention:
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*
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* . REALTIME_PRIORITY_CLASS
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* Realtime priority class requires special system permissions to set, and
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* can be dangerous in certain cases.
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*
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* . PROCESS_MODE_BACKGROUND_BEGIN
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* . PROCESS_MODE_BACKGROUND_END
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* Process mode is not covered because it can easily forgotten to be changed
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* back and can cause unforseen side effects that is hard to debug. Besides
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* that, these do generally not really fit into making a Windows somewhat
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* compatible nice() function.
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*/
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PHPAPI int nice(zend_long p)
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{
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DWORD dwFlag = NORMAL_PRIORITY_CLASS;
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if (p < -9) {
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dwFlag = HIGH_PRIORITY_CLASS;
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} else if (p < -4) {
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dwFlag = ABOVE_NORMAL_PRIORITY_CLASS;
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} else if (p > 9) {
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dwFlag = IDLE_PRIORITY_CLASS;
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} else if (p > 4) {
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dwFlag = BELOW_NORMAL_PRIORITY_CLASS;
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}
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if (!SetPriorityClass(GetCurrentProcess(), dwFlag)) {
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return -1;
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}
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return 0;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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