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| author | Denis Vlasenko <vda.linux@googlemail.com> | 2009-03-22 19:00:05 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2009-03-22 19:00:05 +0000 |
| commit | 57abf9e947fa3f7d69f7adb97023b299916ee63c (patch) | |
| tree | bcc36a5d96b56859763bd52a52377ed1c081326a /util-linux/volume_id/linux_swap.c | |
| parent | 3fd104630020168ead90123e45d848d4d2d0a555 (diff) | |
| download | busybox-57abf9e947fa3f7d69f7adb97023b299916ee63c.tar.gz | |
libbb: make history saving/loading concurrent-safe
* all history writers always append (not overwrite) history files
* they reload history if they detect that file length has changed since last
write
* they trim history file only when it grows 4 times longer than MAXLINES
* they do this atomically by creating new file and renaming it to old
Unfortunately, this comes at a price:
function old new delta
load_history - 346 +346
read_line_input 3155 3358 +203
new_line_input_t 17 31 +14
...irrelevant small jitter...
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(add/remove: 1/0 grow/shrink: 5/5 up/down: 573/-13) Total: 560 bytes
Diffstat (limited to 'util-linux/volume_id/linux_swap.c')
0 files changed, 0 insertions, 0 deletions