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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_BROWSER_PROCESS_IO_THREAD_H_
#define CONTENT_BROWSER_BROWSER_PROCESS_IO_THREAD_H_
#include <memory>
#include "base/threading/thread.h"
#include "base/threading/thread_checker.h"
#include "build/build_config.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
#if BUILDFLAG(IS_WIN)
namespace base {
namespace win {
class ScopedCOMInitializer;
}
} // namespace base
#endif
namespace content {
class BrowserThreadImpl;
}
namespace content {
// ----------------------------------------------------------------------------
// A BrowserProcessIOThread is a physical thread backing the IO thread.
//
// Applications must initialize the COM library before they can call
// COM library functions other than CoGetMalloc and memory allocation
// functions, so this class initializes COM for those users.
class CONTENT_EXPORT BrowserProcessIOThread : public base::Thread {
public:
// Constructs a BrowserProcessIOThread.
BrowserProcessIOThread();
BrowserProcessIOThread(const BrowserProcessIOThread&) = delete;
BrowserProcessIOThread& operator=(const BrowserProcessIOThread&) = delete;
~BrowserProcessIOThread() override;
// Registers this thread to represent the IO thread in the browser_thread.h
// API. This thread must already be running when this is called. This can only
// be called once per BrowserProcessIOThread instance.
void RegisterAsBrowserThread();
// Ideally there wouldn't be a special blanket allowance to block the
// BrowserThreads in tests but TestBrowserThreadImpl previously bypassed
// BrowserProcessIOThread and hence wasn't subject to ThreadRestrictions...
// Flipping that around in favor of explicit scoped allowances would be
// preferable but a non-trivial amount of work. Can only be called before
// starting this BrowserProcessIOThread.
void AllowBlockingForTesting();
static void ProcessHostCleanUp();
protected:
void Init() override;
void Run(base::RunLoop* run_loop) override;
void CleanUp() override;
private:
void IOThreadRun(base::RunLoop* run_loop);
// BrowserThreads are not allowed to do file I/O nor wait on synchronization
// primivives except when explicitly allowed in tests.
bool is_blocking_allowed_for_testing_ = false;
// The BrowserThread registration for this IO thread, initialized in
// RegisterAsBrowserThread().
std::unique_ptr<BrowserThreadImpl> browser_thread_;
#if BUILDFLAG(IS_WIN)
std::unique_ptr<base::win::ScopedCOMInitializer> com_initializer_;
#endif
THREAD_CHECKER(browser_thread_checker_);
};
} // namespace content
#endif // CONTENT_BROWSER_BROWSER_PROCESS_IO_THREAD_H_
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