| // Copyright 2023 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef GIN_THREAD_ISOLATION_H_ |
| #define GIN_THREAD_ISOLATION_H_ |
| |
| #include "partition_alloc/buildflags.h" |
| |
| #if PA_BUILDFLAG(ENABLE_THREAD_ISOLATION) |
| |
| #include "base/no_destructor.h" |
| #include "gin/gin_export.h" |
| #include "gin/v8_platform_thread_isolated_allocator.h" |
| #include "partition_alloc/thread_isolation/alignment.h" |
| |
| namespace gin { |
| |
| // All data used for thread isolation needs to live in this struct since we need |
| // to write-protect it with the same thread isolation mechanism. |
| // The implementation is platform specific, e.g. using pkeys on x64. |
| struct GIN_EXPORT PA_THREAD_ISOLATED_ALIGN ThreadIsolationData { |
| // If we're using pkeys for isolation, we need to allocate the key before |
| // spawning any threads. Otherwise, the other threads will not have read |
| // permissions to memory tagged with this key. |
| void InitializeBeforeThreadCreation(); |
| |
| // Returns if InitializeBeforeThreadCreation has been called and the |
| // initialization was successful, i.e. the platform supports the isolation |
| // mechanism. |
| bool Initialized() const; |
| |
| base::NoDestructor<ThreadIsolatedAllocator> allocator; |
| int pkey = -1; |
| }; |
| static_assert(PA_THREAD_ISOLATED_FILL_PAGE_SZ(sizeof(ThreadIsolationData)) == |
| 0); |
| |
| GIN_EXPORT ThreadIsolationData& GetThreadIsolationData(); |
| |
| } // namespace gin |
| |
| #endif // PA_BUILDFLAG(ENABLE_THREAD_ISOLATION) |
| |
| #endif // GIN_THREAD_ISOLATION_H_ |