debugger, cluster: each worker has new debug port

Implement support for debugging cluster workers. Each worker process
is assigned a new debug port in an increasing sequence.

I.e. when master process uses port 5858, then worker 1 uses port 5859,
worker 2 uses port 5860, and so on.

Introduce new command-line parameter '--debug-port=' which sets debug_port
but does not start debugger. This option works for all node processes, it
is not specific to cluster workers.

Fixes joyent/node#5318.

1 files changed, 25 insertions, 0 deletions

diff --git a/test/fixtures/clustered-server/app.js b/test/fixtures/clustered-server/app.js
new file mode 100644
index 0000000000..16ebc69741
--- /dev/null
+++ b/test/fixtures/clustered-server/app.js
@@ -0,0 +1,25 @@
+var http = require('http');
+var cluster = require('cluster');
+var common = require('../../common.js');
+
+function handleRequest(request, response) {
+  response.end('hello world\n');
+}
+
+var NUMBER_OF_WORKERS = 2;
+var workersOnline = 0;
+
+if (cluster.isMaster) {
+  cluster.on('online', function() {
+      workersOnline++;
+      if (workersOnline == NUMBER_OF_WORKERS)
+        console.error('all workers are running');
+    });
+
+  for (var i = 0; i < NUMBER_OF_WORKERS; i++) {
+    cluster.fork();
+  }
+} else {
+  var server = http.createServer(handleRequest);
+  server.listen(common.PORT+1000);
+}