37 lines
1.1 KiB
Markdown
37 lines
1.1 KiB
Markdown
|
|
||
|
|
The `sync.pool` module provides a convenient way to run identical tasks over
|
||
|
|
an array of items *in parallel*, without worrying about thread synchronization,
|
||
|
|
waitgroups, mutexes etc.., you just need to supply a callback function, that
|
||
|
|
will be called once per each item in your input array.
|
||
|
|
|
||
|
|
After all the work is done in parallel by the worker threads in the pool,
|
||
|
|
pool.work_on_items will return. You can then call pool.get_results<Result>()
|
||
|
|
to retrieve a list of all the results, that the worker callbacks returned
|
||
|
|
for each input item. Example:
|
||
|
|
|
||
|
|
```v
|
||
|
|
import sync.pool
|
||
|
|
|
||
|
|
struct SResult {
|
||
|
|
s string
|
||
|
|
}
|
||
|
|
|
||
|
|
fn sprocess(pp &pool.PoolProcessor, idx int, wid int) &SResult {
|
||
|
|
item := pp.get_item<string>(idx)
|
||
|
|
println('idx: $idx, wid: $wid, item: ' + item)
|
||
|
|
return &SResult{item.reverse()}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
mut pp := pool.new_pool_processor(callback: sprocess)
|
||
|
|
pp.work_on_items(['1abc', '2abc', '3abc', '4abc', '5abc', '6abc', '7abc'])
|
||
|
|
// optionally, you can iterate over the results too:
|
||
|
|
for x in pp.get_results<SResult>() {
|
||
|
|
println('result: $x.s')
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
See https://github.com/vlang/v/blob/master/vlib/sync/pool/pool_test.v for a
|
||
|
|
more detailed usage example.
|