e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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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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