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use wyhash for power of two lock stripes

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Muki Kiboigo
2026-03-30 08:39:56 -07:00
parent 0d0ad718a9
commit 372b911f20
1 changed files with 4 additions and 1 deletions
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5
src/network/cache/FsCache.zig vendored
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@@ -25,6 +25,9 @@ const CachedResponse = Cache.CachedResponse;
const CACHE_VERSION: usize = 1; const CACHE_VERSION: usize = 1;
const LOCK_STRIPES = 16; const LOCK_STRIPES = 16;
comptime {
std.debug.assert(std.math.isPowerOfTwo(LOCK_STRIPES));
}
pub const FsCache = @This(); pub const FsCache = @This();
@@ -37,7 +40,7 @@ const CacheMetadataFile = struct {
}; };
fn getLockPtr(self: *FsCache, key: *const [HASHED_KEY_LEN]u8) *std.Thread.Mutex { fn getLockPtr(self: *FsCache, key: *const [HASHED_KEY_LEN]u8) *std.Thread.Mutex {
const lock_idx: usize = @truncate(std.hash.Wyhash.hash(0, key) % LOCK_STRIPES); const lock_idx = std.hash.Wyhash.hash(0, key[0..]) & (LOCK_STRIPES - 1);
return &self.locks[lock_idx]; return &self.locks[lock_idx];
} }