The static Atomics.isLockFree() method is used to determine whether the Atomics methods use locks or atomic hardware operations when applied to typed arrays with the given element byte size. It returns false if the given size is not one of the BYTES_PER_ELEMENT property of integer TypedArray types.
Atomics.isLockFree()
Try it
Syntax
Atomics.isLockFree(size)
Parameters
-
size -
The size in bytes to check.
Return value
A true or false value indicating whether the operation is lock free.
Examples
Using isLockFree
Atomics.isLockFree(1); // true Atomics.isLockFree(2); // true Atomics.isLockFree(3); // false Atomics.isLockFree(4); // true Atomics.isLockFree(5); // false Atomics.isLockFree(6); // false Atomics.isLockFree(7); // false Atomics.isLockFree(8); // true
Specifications
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
isLockFree |
68
60-63
Chrome disabled
SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of
speculative side-channel attacks. This was a temporary removal while mitigations were put in place.
|
79
16-17
Support was removed to mitigate
speculative execution side-channel attacks (Windows blog).
|
78
57
Support was disabled by default to mitigate
speculative execution side-channel attacks (Mozilla Security Blog).
55-57
46-55
|
No
|
No
|
15.2
Like
SharedArrayBuffer,
Atomics is gated behind COOP/COEP. For more detail, read
Making your website "cross-origin isolated" using COOP and COEP.
10.1-11.1
|
60-63
Chrome disabled
SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of
speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place.
|
60-63
Chrome disabled
SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of
speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place.
|
57
Support was disabled by default to mitigate
speculative execution side-channel attacks (Mozilla Security Blog).
55-57
46-55
|
No
|
15.2
Like
SharedArrayBuffer,
Atomics is gated behind COOP/COEP. For more detail, read
Making your website "cross-origin isolated" using COOP and COEP.
10.3-11.3
|
No
Chrome disabled
SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of
speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place.
|
1.0
|
8.10.0
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Atomics/isLockFree
