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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/rocksdb/util/random.cc | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/rocksdb/util/random.cc')
-rw-r--r-- | src/rocksdb/util/random.cc | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/rocksdb/util/random.cc b/src/rocksdb/util/random.cc new file mode 100644 index 000000000..38c36defd --- /dev/null +++ b/src/rocksdb/util/random.cc @@ -0,0 +1,38 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). +// + +#include "util/random.h" + +#include <stdint.h> +#include <string.h> +#include <thread> +#include <utility> + +#include "port/likely.h" +#include "util/thread_local.h" + +#ifdef ROCKSDB_SUPPORT_THREAD_LOCAL +#define STORAGE_DECL static __thread +#else +#define STORAGE_DECL static +#endif + +namespace ROCKSDB_NAMESPACE { + +Random* Random::GetTLSInstance() { + STORAGE_DECL Random* tls_instance; + STORAGE_DECL std::aligned_storage<sizeof(Random)>::type tls_instance_bytes; + + auto rv = tls_instance; + if (UNLIKELY(rv == nullptr)) { + size_t seed = std::hash<std::thread::id>()(std::this_thread::get_id()); + rv = new (&tls_instance_bytes) Random((uint32_t)seed); + tls_instance = rv; + } + return rv; +} + +} // namespace ROCKSDB_NAMESPACE |