Create non-blocked fifo

Create non-blocked fifo

On average it takes about 459 ms to create a FIFO file for logging. This delay isn't small compared to the average running time (1354 ms) of a single testcase on native.

The delay is because currently creating the FIFO file is blocked until the other end is opened also.

So changing it to non-blocking will save the amount of time.

BUG=449354
Committed: https://crrev.com/159f0e04e089a3a12c9ffc44ea644a3abbc4a7ae
Cr-Commit-Position: refs/heads/master@{#320847}

[Jaekyun Seok (inactive), 2015-03-16 02:44:37]

jaekyun@chromium.org changed reviewers:
+ sievers@chromium.org, tedchoc@chromium.org

[Jaekyun Seok (inactive), 2015-03-16 02:44:38]

Please take a look at this CL.

[Ted C, 2015-03-16 22:19:35]

lgtm

Not sure about the implications, but assuming this works then it's fine with me.

[Jaekyun Seok (inactive), 2015-03-17 01:27:01]

The CQ bit was checked by jaekyun@chromium.org

[commit-bot: I haz the power, 2015-03-17 01:27:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1003073002/60001

[commit-bot: I haz the power, 2015-03-17 02:20:05]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-03-17 02:20:36]

Patchset 4 (id:??) landed as
https://crrev.com/159f0e04e089a3a12c9ffc44ea644a3abbc4a7ae
Cr-Commit-Position: refs/heads/master@{#320847}