sync: move pool related code to sync.pool, cleanup, add a README.md

examples/news_fetcher.v

@@ -3,25 +3,25 @@
 // that can be found in the LICENSE file.
 import net.http
 import json
-import sync
+import sync.pool
 
 struct Story {
 	title string
 	url   string
 }
 
-fn worker_fetch(p &sync.PoolProcessor, cursor int, worker_id int) voidptr {
-	id := p.get_int_item(cursor)
+fn worker_fetch(p &pool.PoolProcessor, cursor int, worker_id int) voidptr {
+	id := p.get_item<int>(cursor)
 	resp := http.get('https://hacker-news.firebaseio.com/v0/item/${id}.json') or {
 		println('failed to fetch data from /v0/item/${id}.json')
-		return sync.no_result
+		return pool.no_result
 	}
-	story := json.decode(Story,resp.text) or {
+	story := json.decode(Story, resp.text) or {
 		println('failed to decode a story')
-		return sync.no_result
+		return pool.no_result
 	}
 	println('# $cursor) $story.title | $story.url')
-	return sync.no_result
+	return pool.no_result
 }
 
 // Fetches top HN stories in parallel, depending on how many cores you have
@@ -30,20 +30,20 @@ fn main() {
 		println('failed to fetch data from /v0/topstories.json')
 		return
 	}
-	mut ids := json.decode([]int,resp.text) or {
+	mut ids := json.decode([]int, resp.text) or {
 		println('failed to decode topstories.json')
 		return
 	}
 	if ids.len > 10 {
 		ids = ids[0..10]
 	}
-	mut fetcher_pool := sync.new_pool_processor({
+	mut fetcher_pool := pool.new_pool_processor(
 		callback: worker_fetch
-	})
+	)
 	// NB: if you do not call set_max_jobs, the pool will try to use an optimal
 	// number of threads, one per each core in your system, which in most
 	// cases is what you want anyway... You can override the automatic choice
 	// by setting the VJOBS environment variable too.
 	// fetcher_pool.set_max_jobs( 4 )
-	fetcher_pool.work_on_items_i(ids)
+	fetcher_pool.work_on_items(ids)
 }