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Improve spawnNode docs

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Ryan Dahl 2011-05-11 12:31:35 -07:00
parent 9e26dab150
commit 7ea7094314
1 changed files with 11 additions and 4 deletions
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doc/api/child_processes.markdown
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@ -183,13 +183,15 @@ the child process is killed.
This is a special case of the `spawn()` functionality for spawning Node This is a special case of the `spawn()` functionality for spawning Node
processes. In addition to having all the methods in a normal ChildProcess processes. In addition to having all the methods in a normal ChildProcess
instance, the returned object, has a communication channel built-in. The instance, the returned object has a communication channel built-in. The
channel is written to with `child.send(message)` and messages are recieved channel is written to with `child.send(message)` and messages are recieved
by a `'message'` event on the child. by a `'message'` event on the child.
For example: For example:
var n = spawnNode(__dirname + '/sub.js'); var cp = require('child_process');
var n = cp.spawnNode(__dirname + '/sub.js');
n.on('message', function(m) { n.on('message', function(m) {
console.log('PARENT got message:', m); console.log('PARENT got message:', m);
@ -208,8 +210,13 @@ And then the child script, `'sub.js'` would might look like this:
In the child the `process` object will have a `send()` method, and `process` In the child the `process` object will have a `send()` method, and `process`
will emit objects each time it receives a message on its channel. will emit objects each time it receives a message on its channel.
By default the spawned Node process will have the stdin, stdout, stderr associated By default the spawned Node process will have the stdin, stdout, stderr
with the parent's. This can be overridden by using the `customFds` option. associated with the parent's. This can be overridden by using the
`customFds` option.
These child Nodes are still whole new instances of V8. Assume at least 30ms
startup and 10mb memory for each new Node. That is, you cannot create many
thousands of them.
### child.kill(signal='SIGTERM') ### child.kill(signal='SIGTERM')