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runtests: use a per-runner random seed

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Each runner needs a unique random seed to reduce the chance of port
number collisions. The new scheme uses a consistent per-runner source of
randomness which results in deterministic behaviour, as it did before.

Ref: #10818
This commit is contained in:
Dan Fandrich 2023-05-18 21:40:05 -07:00
parent 4317c5549b
commit 78d8bc4c63
3 changed files with 9 additions and 1 deletions
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7
tests/runner.pm
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@ -168,6 +168,13 @@ sub runner_init {
$ENV{'XDG_CONFIG_HOME'}=$ENV{'HOME'};
$ENV{'COLUMNS'}=79; # screen width!
# Incorporate the $logdir into the random seed and re-seed the PRNG.
# This gives each runner a unique yet consistent seed which provides
# more unique port number selection in each runner, yet is deterministic
# across runs.
$randseed += unpack('%16C*', $logdir);
srand $randseed;
# create pipes for communication with runner
my ($thisrunnerr, $thiscontrollerw, $thiscontrollerr, $thisrunnerw);
pipe $thisrunnerr, $thiscontrollerw;