fcf.NLock.isLockNamedMutex() function
[SERVER ONLY]
fcf.NLock.isLockNamedMutex (string a_name, function a_cb)
Package: fcf-framework-lock
File: fcf-framework-lock:index.js
Available from version: 1.0.6
Checks whether the named mutex is locked
Arguments
- The mutex name
- The function of processing the result of the function execution.
Function signature: a_cb(
-
Error |undefined a_error - Error object. -
boolean a_isLocked -true if the mutex has a lock.
Example: Function application
let libLock = require("fcf-framework-lock");
async function main(){
const mutexName = "TestMutexForExample"
let isLocked = await new Promise((a_res, a_rej)=>{
libLock .isLockNamedMutex (mutexName, (a_error, a_isLocked)=>{
if (!a_error){
a_res(a_isLocked);
} else {
a_rej(a_error);
}
});
});
console.log("Mutex state:", isLocked ? "LOCKED" : "NOT LOCKED");
islocked = await new Promise((a_res, a_rej)=>{
libLock .lockNamedMutex (mutexName, (a_error, a_lock)=>{
if (!a_error){
a_res(a_lock);
} else {
a_rej(a_error);
}
});
});
isLocked = await new Promise((a_res, a_rej)=>{
libLock .isLockNamedMutex (mutexName, (a_error, a_isLocked)=>{
if (!a_error){
a_res(a_isLocked);
} else {
a_rej(a_error);
}
});
});
console.log("Mutex state:", isLocked ? "LOCKED" : "NOT LOCKED");
}
main();
Output:
Mutex state: NOT LOCKED
Mutex state: LOCKED
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