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| author | Sybren A. Stüvel <sybren@blender.org> | 2021-09-20 13:01:59 +0300 |
|---|---|---|
| committer | Sybren A. Stüvel <sybren@blender.org> | 2021-09-20 13:10:25 +0300 |
| commit | 4eba920d15183e73ab8c2c9986b621aec4cbeca9 (patch) | |
| tree | 58e711e1acecb279406c177e66548a590feca67d /source/blender/blenlib/intern/uuid.cc | |
| parent | 1f51672d7126d8c0a0b962060c01632e6e07dd5f (diff) | |
UUID: include 'seconds' field of current time in RNG seed
XOR the 'seconds' and 'nanoseconds' fields of the current time to seed the
RNG used for generating random UUIDs. This ensures a better seed just in
case the clock as no sub-second resolution.
Diffstat (limited to 'source/blender/blenlib/intern/uuid.cc')
| -rw-r--r-- | source/blender/blenlib/intern/uuid.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/source/blender/blenlib/intern/uuid.cc b/source/blender/blenlib/intern/uuid.cc index 0c381e5dcd2..247928893f3 100644 --- a/source/blender/blenlib/intern/uuid.cc +++ b/source/blender/blenlib/intern/uuid.cc @@ -40,7 +40,10 @@ UUID BLI_uuid_generate_random() struct timespec ts; timespec_get(&ts, TIME_UTC); - rng.seed(ts.tv_nsec); + /* XOR the nanosecond and second fields, just in case the clock only has seconds resolution. */ + uint64_t seed = ts.tv_nsec; + seed ^= ts.tv_sec; + rng.seed(seed); return rng; }(); |