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/
117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#include "MEM_guardedalloc.h"
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#include "BLI_implicit_sharing_ptr.hh"
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#include "testing/testing.h"
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namespace blender::tests {
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class ImplicitlySharedData : public ImplicitSharingMixin {
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public:
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ImplicitSharingPtr<ImplicitlySharedData> copy() const
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{
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return MEM_new<ImplicitlySharedData>(__func__);
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}
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void delete_self() override
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{
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MEM_delete(this);
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}
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};
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class SharedDataContainer {
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private:
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ImplicitSharingPtr<ImplicitlySharedData> data_;
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public:
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SharedDataContainer() : data_(MEM_new<ImplicitlySharedData>(__func__)) {}
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const ImplicitSharingInfo *sharing_info() const
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{
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return data_.get();
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}
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const ImplicitlySharedData *get_for_read() const
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{
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return data_.get();
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}
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ImplicitlySharedData *get_for_write()
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{
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if (!data_) {
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return nullptr;
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}
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if (data_->is_mutable()) {
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data_->tag_ensured_mutable();
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return data_.get();
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}
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data_ = data_->copy();
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return data_.get();
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}
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};
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TEST(implicit_sharing, CopyOnWriteAccess)
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{
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/* Create the initial data. */
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SharedDataContainer a;
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EXPECT_NE(a.get_for_read(), nullptr);
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/* a and b share the same underlying data now. */
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SharedDataContainer b = a;
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EXPECT_EQ(a.get_for_read(), b.get_for_read());
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/* c now shares the data with a and b. */
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SharedDataContainer c = a;
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EXPECT_EQ(b.get_for_read(), c.get_for_read());
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/* Retrieving write access on b should make a copy because the data is shared. */
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ImplicitlySharedData *data_b1 = b.get_for_write();
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EXPECT_NE(data_b1, nullptr);
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EXPECT_EQ(data_b1, b.get_for_read());
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EXPECT_NE(data_b1, a.get_for_read());
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EXPECT_NE(data_b1, c.get_for_read());
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/* Retrieving the same write access again should *not* make another copy. */
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ImplicitlySharedData *data_b2 = b.get_for_write();
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EXPECT_EQ(data_b1, data_b2);
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/* Moving b should also move the data. b then does not have ownership anymore. Since the data in
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* b only had one owner, the data is still mutable now that d is the owner. */
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SharedDataContainer d = std::move(b);
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EXPECT_EQ(b.get_for_read(), nullptr);
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EXPECT_EQ(b.get_for_write(), nullptr);
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EXPECT_EQ(d.get_for_read(), data_b1);
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EXPECT_EQ(d.get_for_write(), data_b1);
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}
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TEST(implicit_sharing, WeakUser)
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{
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SharedDataContainer a;
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const ImplicitSharingInfo *sharing_info = a.sharing_info();
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EXPECT_FALSE(sharing_info->is_expired());
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EXPECT_TRUE(sharing_info->is_mutable());
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sharing_info->add_weak_user();
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EXPECT_FALSE(sharing_info->is_expired());
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EXPECT_TRUE(sharing_info->is_mutable());
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a = {};
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EXPECT_TRUE(sharing_info->is_expired());
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sharing_info->remove_weak_user_and_delete_if_last();
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}
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TEST(implicit_sharing, Version)
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{
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SharedDataContainer a;
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const ImplicitSharingInfo *sharing_info = a.sharing_info();
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const int old_version = sharing_info->version();
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a.get_for_read();
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EXPECT_EQ(old_version, sharing_info->version());
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a.get_for_write();
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EXPECT_LT(old_version, sharing_info->version());
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}
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} // namespace blender::tests
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