| // Copyright 2023 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef SRC_DAWN_NATIVE_SYSTEMHANDLE_H_ |
| #define SRC_DAWN_NATIVE_SYSTEMHANDLE_H_ |
| |
| #include "dawn/common/NonCopyable.h" |
| #include "dawn/common/Platform.h" |
| #include "dawn/native/Error.h" |
| |
| namespace dawn::native { |
| |
| class SystemHandle : public NonCopyable { |
| public: |
| // Create an alias for the actual primitive handle type on a platform. |
| #if DAWN_PLATFORM_IS(WINDOWS) |
| using Handle = void*; |
| #elif DAWN_PLATFORM_IS(FUCHSIA) |
| using Handle = uint32_t; |
| #elif DAWN_PLATFORM_IS(POSIX) |
| using Handle = int; |
| #else |
| #error "Platform not supported." |
| #endif |
| |
| SystemHandle(); |
| |
| // Create a SystemHandle by taking ownership of `handle`. |
| // Declaration is a template so that there is never implicit |
| // conversion of the handle arg. |
| template <typename Arg> |
| static SystemHandle Acquire(Arg handle) { |
| return SystemHandle(handle); |
| } |
| |
| // Create a SystemHandle by duplicating `handle`. |
| // Declaration is a template so that there is never implicit |
| // conversion of the handle arg. |
| template <typename Arg> |
| static ResultOrError<SystemHandle> Duplicate(Arg handle) { |
| SystemHandle tmpOwnedHandle = SystemHandle::Acquire(handle); |
| SystemHandle dupHandle; |
| DAWN_TRY_ASSIGN(dupHandle, tmpOwnedHandle.Duplicate()); |
| tmpOwnedHandle.Detach(); |
| return dupHandle; |
| } |
| |
| bool IsValid() const; |
| |
| SystemHandle(SystemHandle&& rhs); |
| SystemHandle& operator=(SystemHandle&& rhs); |
| |
| Handle Get() const; |
| Handle* GetMut(); |
| Handle Detach(); |
| ResultOrError<SystemHandle> Duplicate() const; |
| void Close(); |
| |
| ~SystemHandle(); |
| |
| private: |
| struct ErrorTag {}; |
| |
| explicit SystemHandle(Handle handle); |
| explicit SystemHandle(ErrorTag tag); |
| |
| // Constructor when the type does not match the Handle type on this platform. |
| template <typename Arg, typename = std::enable_if_t<!std::is_same_v<Arg, Handle>>> |
| explicit SystemHandle(Arg) : SystemHandle(ErrorTag{}) {} |
| |
| void LogIncorrectHandleType(); |
| |
| Handle mHandle; |
| }; |
| |
| } // namespace dawn::native |
| |
| #endif // SRC_DAWN_NATIVE_SYSTEMHANDLE_H_ |