c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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*/
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#include "BLI_session_uuid.h"
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#include "BLI_utildefines.h"
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#include "atomic_ops.h"
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/* Special value which indicates the UUID has not been assigned yet. */
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#define BLI_SESSION_UUID_NONE 0
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static const SessionUUID global_session_uuid_none = {BLI_SESSION_UUID_NONE};
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/* Denotes last used UUID.
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* It might eventually overflow, and easiest is to add more bits to it. */
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static SessionUUID global_session_uuid = {BLI_SESSION_UUID_NONE};
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SessionUUID BLI_session_uuid_generate(void)
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{
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SessionUUID result;
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result.uuid_ = atomic_add_and_fetch_uint64(&global_session_uuid.uuid_, 1);
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if (!BLI_session_uuid_is_generated(&result)) {
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/* Happens when the UUID overflows.
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*
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* Just request the UUID once again, hoping that there are not a lot of high-priority threads
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* which will overflow the counter once again between the previous call and this one.
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*
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* NOTE: It is possible to have collisions after such overflow. */
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result.uuid_ = atomic_add_and_fetch_uint64(&global_session_uuid.uuid_, 1);
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}
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return result;
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}
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bool BLI_session_uuid_is_generated(const SessionUUID *uuid)
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{
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return !BLI_session_uuid_is_equal(uuid, &global_session_uuid_none);
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}
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bool BLI_session_uuid_is_equal(const SessionUUID *lhs, const SessionUUID *rhs)
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{
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return lhs->uuid_ == rhs->uuid_;
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}
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uint64_t BLI_session_uuid_hash_uint64(const SessionUUID *uuid)
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{
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return uuid->uuid_;
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}
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uint BLI_session_uuid_ghash_hash(const void *uuid_v)
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{
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const SessionUUID *uuid = (const SessionUUID *)uuid_v;
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return uuid->uuid_ & 0xffffffff;
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}
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bool BLI_session_uuid_ghash_compare(const void *lhs_v, const void *rhs_v)
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{
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const SessionUUID *lhs = (const SessionUUID *)lhs_v;
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const SessionUUID *rhs = (const SessionUUID *)rhs_v;
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return !BLI_session_uuid_is_equal(lhs, rhs);
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}
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