El método os.getPriority() es una interfaz de programación de aplicaciones incorporada del módulo os que se utiliza para obtener la prioridad de programación del proceso especificado por pid.
Sintaxis:
os.getPriority( pid )
Parámetros: este método acepta un solo parámetro como se mencionó anteriormente y se describe a continuación:
- pid: es un parámetro opcional que especifica la identificación del proceso cuya prioridad de programación se devolverá. Su valor por defecto es 0.
Valor devuelto: este método devuelve un valor entero que especifica la prioridad de programación del proceso especificado por pid. Si el valor de la identificación del proceso (pid) se establece en 0, devuelve la prioridad de programación del proceso actual.
Los siguientes ejemplos ilustran el uso del método os.getPriority() en Node.js:
Ejemplo 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);
}
Producción:
0
Ejemplo 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);
}
});
});
Producción:
[ { 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
Nota: El programa anterior se compilará y ejecutará utilizando el comando node filename.js.
Referencia: https://nodejs.org/api/os.html#os_os_getpriority_pid