Node.js os.getPriority() 方法
os.getPriority() 方法是 os 模块内置的应用程序编程接口，用于获取 pid 指定的进程的调度优先级。
句法：
os.getPriority( pid )参数：此方法接受上面提到的单个参数，如下所述：
- pid：可选参数，指定要返回其调度优先级的进程id。它的默认值为 0。
返回值：该方法返回一个整数值，指定pid指定的进程的调度优先级。如果进程 id (pid) 的值设置为 0，则返回当前进程的调度优先级。
下面的示例说明了 Node.js 中os.getPriority() 方法的使用：
示例 1：
Javascript
// Node.js program to demonstrate the
// os.getPriority() Method
// Require os module
const os = require('os');
// Printing os.getPriority() value
try {
// Printing priority of current process
console.log(os.getPriority());
}catch(err){
console.log(i + ": error occured" + err);
}Javascript
// Node.js program to demonstrate the
// os.getPriority() Method
// Require os module
const os = require('os');
// Accessing ps-list module to
// get process details
const psList = require('ps-list');
// Calling psList function defined
// in ps-list module
psList().then(data => {
// Printing all the process information
// from returned data
console.log(data);
// Iterating through each element
// of the returned data
data.forEach(function(element){
try{
// Getting priority of selected process
var process_priority=os.getPriority(element.pid);
// Printing pid priority and process name
console.log("pid:" + String(element.pid)
+ "\t priority:" + String(process_priority)
+ "\t name:" + String(element.name));
}catch(err){
// There will be error like operation
// not permitted, so omitting error to
// get clean output printing error
// generated from os.getPriority() function
//console.log("pid:"+String(element.pid)+
//"\t priority: error \t name:"
//+String(element.name)); console.log(err);
}
});
});输出：
0示例 2：
Javascript
// Node.js program to demonstrate the
// os.getPriority() Method
// Require os module
const os = require('os');
// Accessing ps-list module to
// get process details
const psList = require('ps-list');
// Calling psList function defined
// in ps-list module
psList().then(data => {
// Printing all the process information
// from returned data
console.log(data);
// Iterating through each element
// of the returned data
data.forEach(function(element){
try{
// Getting priority of selected process
var process_priority=os.getPriority(element.pid);
// Printing pid priority and process name
console.log("pid:" + String(element.pid)
+ "\t priority:" + String(process_priority)
+ "\t name:" + String(element.name));
}catch(err){
// There will be error like operation
// not permitted, so omitting error to
// get clean output printing error
// generated from os.getPriority() function
//console.log("pid:"+String(element.pid)+
//"\t priority: error \t name:"
//+String(element.name)); console.log(err);
}
});
});
输出：
[ { name: '[System Process]', pid: 0, ppid: 0 },
{ name: 'System', pid: 4, ppid: 0 },
{ name: 'Registry', pid: 96, ppid: 4 },
{ name: 'smss.exe', pid: 392, ppid: 4 },
{ name: 'csrss.exe', pid: 640, ppid: 624 },
{ name: 'wininit.exe', pid: 752, ppid: 624 },
{ name: 'csrss.exe', pid: 768, ppid: 744 },
{ name: 'services.exe', pid: 824, ppid: 752 },
{ name: 'lsass.exe', pid: 832, ppid: 752 },
{ name: 'svchost.exe', pid: 956, ppid: 824 },
{ name: 'WUDFHost.exe', pid: 964, ppid: 824 },
{ name: 'svchost.exe', pid: 992, ppid: 824 },
{ name: 'fontdrvhost.exe', pid: 72, ppid: 752 },
{ name: 'svchost.exe', pid: 548, ppid: 824 },
{ name: 'svchost.exe', pid: 868, ppid: 824 },
{ name: 'winlogon.exe', pid: 1104, ppid: 744 },
{ name: 'fontdrvhost.exe', pid: 1164, ppid: 1104 },
{ name: 'dwm.exe', pid: 1240, ppid: 1104 },
{ name: 'svchost.exe', pid: 1300, ppid: 824 },
{ name: 'svchost.exe', pid: 1328, ppid: 824 },
{ name: 'svchost.exe', pid: 1360, ppid: 824 },
{ name: 'svchost.exe', pid: 1376, ppid: 824 },
{ name: 'svchost.exe', pid: 1480, ppid: 824 },
{ name: 'svchost.exe', pid: 1588, ppid: 824 },
{ name: 'svchost.exe', pid: 1640, ppid: 824 },
{ name: 'svchost.exe', pid: 1676, ppid: 824 },
{ name: 'svchost.exe', pid: 1684, ppid: 824 },
{ name: 'svchost.exe', pid: 1740, ppid: 824 },
{ name: 'svchost.exe', pid: 1836, ppid: 824 },
{ name: 'svchost.exe', pid: 1884, ppid: 824 },
{ name: 'svchost.exe', pid: 1948, ppid: 824 },
{ name: 'svchost.exe', pid: 1956, ppid: 824 },
{ name: 'svchost.exe', pid: 2024, ppid: 824 },
{ name: 'dasHost.exe', pid: 2084, ppid: 2024 },
{ name: 'svchost.exe', pid: 2124, ppid: 824 },
{ name: 'svchost.exe', pid: 2184, ppid: 824 },
{ name: 'svchost.exe', pid: 2196, ppid: 824 },
{ name: 'svchost.exe', pid: 2268, ppid: 824 },
{ name: 'svchost.exe', pid: 2360, ppid: 824 },
{ name: 'atiesrxx.exe', pid: 2400, ppid: 824 },
{ name: 'atieclxx.exe', pid: 2496, ppid: 2400 },
{ name: 'svchost.exe', pid: 2504, ppid: 824 },
{ name: 'svchost.exe', pid: 2512, ppid: 824 },
{ name: 'svchost.exe', pid: 2524, ppid: 824 },
{ name: 'Memory Compression', pid: 2588, ppid: 4 },
{ name: 'svchost.exe', pid: 2664, ppid: 824 },
{ name: 'igfxCUIService.exe', pid: 2688, ppid: 824 },
{ name: 'svchost.exe', pid: 2728, ppid: 824 },
{ name: 'svchost.exe', pid: 2736, ppid: 824 },
{ name: 'svchost.exe', pid: 2924, ppid: 824 },
{ name: 'svchost.exe', pid: 2952, ppid: 824 },
{ name: 'RtkAudioService64.exe', pid: 2096, ppid: 824 },
{ name: 'svchost.exe', pid: 2824, ppid: 824 },
{ name: 'svchost.exe', pid: 2820, ppid: 824 },
{ name: 'svchost.exe', pid: 3180, ppid: 824 },
{ name: 'svchost.exe', pid: 3188, ppid: 824 },
{ name: 'svchost.exe', pid: 3264, ppid: 824 },
{ name: 'svchost.exe', pid: 3364, ppid: 824 },
{ name: 'svchost.exe', pid: 3464, ppid: 824 },
{ name: 'svchost.exe', pid: 3500, ppid: 824 },
{ name: 'svchost.exe', pid: 3508, ppid: 824 },
{ name: 'svchost.exe', pid: 3556, ppid: 824 },
{ name: 'spoolsv.exe', pid: 3564, ppid: 824 },
{ name: 'svchost.exe', pid: 3736, ppid: 824 },
{ name: 'mDNSResponder.exe', pid: 3820, ppid: 824 },
{ name: 'armsvc.exe', pid: 3828, ppid: 824 },
{ name: 'OfficeClickToRun.exe', pid: 3840, ppid: 824 },
{ name: 'IntelCpHDCPSvc.exe', pid: 3856, ppid: 824 },
{ name: 'svchost.exe', pid: 3864, ppid: 824 },
{ name: 'svchost.exe', pid: 3884, ppid: 824 },
{ name: 'esif_uf.exe', pid: 3932, ppid: 824 },
{ name: 'svchost.exe', pid: 3940, ppid: 824 },
{ name: 'wlanext.exe', pid: 3948, ppid: 3464 },
{ name: 'mongod.exe', pid: 4028, ppid: 824 },
{ name: 'MDZkM.exe', pid: 4056, ppid: 824 },
{ name: 'rundll32.exe', pid: 4084, ppid: 824 },
{ name: 'svchost.exe', pid: 3076, ppid: 824 },
{ name: 'rundll32.exe', pid: 3068, ppid: 4084 },
{ name: 'RtkBtAudioServ.exe', pid: 3720, ppid: 824 },
{ name: 'conhost.exe', pid: 4108, ppid: 3948 },
{ name: 'svchost.exe', pid: 4116, ppid: 824 },
{ name: 'SynTPEnhService.exe', pid: 4144, ppid: 824 },
{ name: 'svchost.exe', pid: 4152, ppid: 824 },
{ name: 'MsMpEng.exe', pid: 4180, ppid: 824 },
{ name: 'svchost.exe', pid: 4220, ppid: 824 },
{ name: 'svchost.exe', pid: 4228, ppid: 824 },
{ name: 'svchost.exe', pid: 4244, ppid: 824 },
{ name: 'RtkBtManServ.exe', pid: 4604, ppid: 824 },
{ name: 'svchost.exe', pid: 4616, ppid: 824 },
{ name: 'IntelCpHeciSvc.exe', pid: 4624, ppid: 824 },
{ name: 'svchost.exe', pid: 5344, ppid: 824 },
{ name: 'svchost.exe', pid: 5648, ppid: 824 },
{ name: 'svchost.exe', pid: 6064, ppid: 824 },
{ name: 'svchost.exe', pid: 1348, ppid: 824 },
{ name: 'svchost.exe', pid: 1780, ppid: 824 },
{ name: 'svchost.exe', pid: 4092, ppid: 824 },
{ name: 'NisSrv.exe', pid: 6464, ppid: 824 },
{ name: 'sihost.exe', pid: 6716, ppid: 1948 },
{ name: 'svchost.exe', pid: 6724, ppid: 824 },
{ name: 'svchost.exe', pid: 6732, ppid: 824 },
... 90 more items ]
pid:0 priority:0 name:[System Process]
pid:6716 priority:0 name:sihost.exe
pid:6724 priority:0 name:svchost.exe
pid:6732 priority:0 name:svchost.exe
pid:6884 priority:0 name:svchost.exe
pid:6988 priority:0 name:taskhostw.exe
pid:6236 priority:-14 name:ctfmon.exe
pid:652 priority:0 name:explorer.exe
pid:6112 priority:-7 name:SynTPEnh.exe
pid:7420 priority:-7 name:SynTPHelper.exe
pid:7744 priority:0 name:svchost.exe
pid:8140 priority:0 name:schtasks.exe
pid:8148 priority:0 name:conhost.exe
pid:7728 priority:0 name:ShellExperienceHost.exe
pid:1804 priority:0 name:SearchUI.exe
pid:7920 priority:0 name:RuntimeBroker.exe
pid:1792 priority:0 name:RuntimeBroker.exe
pid:1264 priority:0 name:SkypeBackgroundHost.exe
pid:1256 priority:0 name:igfxEM.exe
pid:6208 priority:0 name:YourPhone.exe
pid:2368 priority:10 name:SettingSyncHost.exe
pid:8220 priority:0 name:CastSrv.exe
pid:8508 priority:0 name:RuntimeBroker.exe
pid:8864 priority:0 name:RadeonSettings.exe
pid:8916 priority:0 name:RuntimeBroker.exe
pid:2544 priority:0 name:SkypeApp.exe
pid:6812 priority:0 name:RuntimeBroker.exe
pid:2252 priority:0 name:svchost.exe
pid:1144 priority:0 name:smartscreen.exe
pid:7260 priority:0 name:SecurityHealthSystray.exe
pid:7284 priority:0 name:RtkNGUI64.exe
pid:8172 priority:0 name:IDMan.exe
pid:2716 priority:0 name:chrome.exe
pid:5020 priority:0 name:chrome.exe
pid:6004 priority:0 name:chrome.exe
pid:5916 priority:-7 name:chrome.exe
pid:5912 priority:0 name:chrome.exe
pid:5072 priority:0 name:chrome.exe
pid:2132 priority:0 name:chrome.exe
pid:7808 priority:0 name:chrome.exe
pid:9012 priority:0 name:jusched.exe
pid:6520 priority:19 name:chrome.exe
pid:5308 priority:19 name:chrome.exe
pid:8312 priority:0 name:cmd.exe
pid:3016 priority:0 name:conhost.exe
pid:7740 priority:0 name:IEMonitor.exe
pid:1472 priority:0 name:GameBar.exe
pid:292 priority:0 name:RuntimeBroker.exe
pid:1132 priority:0 name:GameBarFT.exe
pid:2224 priority:19 name:chrome.exe
pid:7360 priority:19 name:chrome.exe
pid:1060 priority:19 name:chrome.exe
pid:7816 priority:0 name:chrome.exe
pid:7640 priority:19 name:chrome.exe
pid:7480 priority:19 name:chrome.exe
pid:9016 priority:0 name:jucheck.exe
pid:1996 priority:0 name:notepad++.exe
pid:3248 priority:0 name:WindowsInternal.ComposableShell.Experiences.TextInput.InputApp.exe
pid:4584 priority:19 name:chrome.exe
pid:3540 priority:0 name:chrome.exe
pid:6160 priority:19 name:chrome.exe
pid:7068 priority:0 name:ApplicationFrameHost.exe
pid:8028 priority:0 name:SystemSettings.exe
pid:2752 priority:0 name:PaintStudio.View.exe
pid:6576 priority:0 name:RuntimeBroker.exe
pid:1708 priority:0 name:Calculator.exe
pid:1496 priority:0 name:node.exe注意：上面的程序将使用 node filename.js 命令编译和运行。
参考： https://nodejs.org/api/os.html#os_os_getpriority_pid