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.
117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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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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