[COMMITTERS] pgsql: Fix busy-wait in pgbench, with --rate.

Fix busy-wait in pgbench, with --rate.

If --rate was used to throttle pgbench, it failed to sleep when it had
nothing to do, leading to a busy-wait with 100% CPU usage. This bug was
introduced in the refactoring in v10. Before that, sleep() was called with
a timeout, even when there were no file descriptors to wait for.

Reported by Jeff Janes, patch by Fabien COELHO. Backpatch to v10.

Discussion:
https://www.postgresql.org/message-id/CAMkU%3D1x5hoX0pLLKPRnXCy0T8uHoDvXdq%2B7kAM9eoC9_z72ucw%40mail.gmail.com

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/babf18579455e85269ad75e1ddb03f34138f77b6

Modified Files
--------------
src/bin/pgbench/pgbench.c | 26 ++++++++++++++++++--------
1 file changed, 18 insertions(+), 8 deletions(-)


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