time-to-botec

README.md (6821B)

---

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 @license Apache-2.0
 
 Copyright (c) 2018 The Stdlib Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
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 # SharedArrayBuffer
 
 > [Constructor][mdn-sharedarraybuffer] returning an object used to represent a generic, fixed-length raw binary data buffer which can be used to create views of shared memory.
 
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 <section class="intro">
 
 </section>
 
 <!-- /.intro -->
 
 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var SharedArrayBuffer = require( '@stdlib/array/shared-buffer' );
 ```
 
 #### SharedArrayBuffer( size )
 
 Returns a [`SharedArrayBuffer`][mdn-sharedarraybuffer] having a specified number of bytes.
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var buf = new SharedArrayBuffer( 5 );
     // returns <SharedArrayBuffer>
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 * * *
 
 ### Properties
 
 #### SharedArrayBuffer.length
 
 Number of input arguments the constructor accepts.
 
 <!-- eslint-disable stdlib/require-globals -->
 
 ```javascript
 var len = SharedArrayBuffer.length;
 // returns 1
 ```
 
 #### SharedArrayBuffer.prototype.byteLength
 
 **Read-only** property which returns the length (in bytes) of the [`SharedArrayBuffer`][mdn-sharedarraybuffer].
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var buf = new SharedArrayBuffer( 5 );
     var byteLength = buf.byteLength;
     // returns 5
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 * * *
 
 ### Methods
 
 #### SharedArrayBuffer.prototype.slice( \[start\[, end]] )
 
 Copies the bytes of a [`SharedArrayBuffer`][mdn-sharedarraybuffer] to a new [`SharedArrayBuffer`][mdn-sharedarraybuffer].
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var b1 = new SharedArrayBuffer( 10 );
 
     var b2 = b1.slice();
     // returns <SharedArrayBuffer>
 
     var bool = ( b2 === b1 );
     // returns false
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 By default, the method copies from the beginning of the [`SharedArrayBuffer`][mdn-sharedarraybuffer]. To beginning copying from a different byte index, provide a `start` argument, specifying the starting byte index (inclusive).
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var b1 = new SharedArrayBuffer( 10 );
     var b2 = b1.slice( 2 );
 
     var nbytes = b2.byteLength;
     // returns 8
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 If `start < 0`, the index is relative to the end of the [`SharedArrayBuffer`][mdn-sharedarraybuffer].
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var b1 = new SharedArrayBuffer( 10 );
     var b2 = b1.slice( -2 );
 
     var nbytes = b2.byteLength;
     // returns 2
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 By default, the method copies to the end of the [`SharedArrayBuffer`][mdn-sharedarraybuffer]. To copy until a particular byte index, provide an `end` index, specifying the ending byte index (exclusive).
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var b1 = new SharedArrayBuffer( 10 );
     var b2 = b1.slice( 2, 6 );
 
     var nbytes = b2.byteLength;
     // returns 4
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 If `end < 0`, the index is relative to the end of the [`SharedArrayBuffer`][mdn-sharedarraybuffer].
 
 <!-- eslint-disable stdlib/require-globals, no-unused-vars, no-inner-declarations -->
 
 ```javascript
 try {
     var b1 = new SharedArrayBuffer( 10 );
     var b2 = b1.slice( 2, -2 );
 
     var nbytes = b2.byteLength;
     // returns 6
 } catch ( err ) {
     console.log( 'Environment does not support SharedArrayBuffers.' );
 }
 ```
 
 </section>
 
 <!-- /.usage -->
 
 * * *
 
 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="notes">
 
 </section>
 
 <!-- /.notes -->
 
 <!-- Package usage examples. -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- TODO: update example to show explicit threading use case -->
 
 <!-- eslint no-undef: "error" -->
 
 <!-- eslint-disable no-unused-vars -->
 
 ```javascript
 var randu = require( '@stdlib/random/base/randu' );
 var Float64Array = require( '@stdlib/array/float64' );
 var Uint8Array = require( '@stdlib/array/uint8' );
 var toBinaryString = require( '@stdlib/number/uint8/base/to-binary-string' );
 var SharedArrayBuffer = require( '@stdlib/array/shared-buffer' );
 
 function main() {
     var bytes;
     var buf;
     var arr;
     var i;
 
     // Create a new SharedArrayBuffer:
     buf = new SharedArrayBuffer( 64 );
 
     // Create a Float64 array buffer view:
     arr = new Float64Array( buf.byteLength/8 );
     for ( i = 0; i < arr.length; i++ ) {
         arr[ i ] = randu() * 100.0;
     }
 
     // Create a "bytes" view of the array buffer:
     bytes = new Uint8Array( arr.buffer );
 
     // Print the bytes:
     for ( i = 0; i < bytes.length; i++ ) {
         console.log( 'byte %d: %s', i, toBinaryString( bytes[ i ] ) );
     }
 }
 
 try {
     main();
 } catch ( err ) {
     console.error( 'Environment does not provide SharedArrayBuffer support.' );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 <section class="references">
 
 </section>
 
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 <section class="links">
 
 [mdn-sharedarraybuffer]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer
 
 </section>
 
 <!-- /.links -->