The static Atomics.isLockFree() method is used to determine whether to use locks or atomic operations. It returns true, if the given size is one of the BYTES_PER_ELEMENT property of integer TypedArray types.
Syntax
Atomics.isLockFree(size)
Parameters
size- The size in byte to check.
Return value
A Boolean indicating whether the operation is lock free.
Examples
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); // false
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript Latest Draft (ECMA-262) The definition of 'Atomics.isLockFree' in that specification. |
Draft | Initial definition in ES2017. |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | No support [2] | No support | 55 (55) [1] | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | 55.0 (55) [1] | No support | No support | No support |
[1] In Firefox version 46 until version 54, this feature is disabled by a preference setting. In about:config, set javascript.options.shared_memory to true.
[2] The implementation is under development and needs these runtime flags: --js-flags=--harmony-sharedarraybuffer --enable-blink-feature=SharedArrayBuffer