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// 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_
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