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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef DEVICE_USB_USB_CONTEXT_H_
6 #define DEVICE_USB_USB_CONTEXT_H_
7 
8 #include "base/basictypes.h"
9 #include "base/memory/ref_counted.h"
10 #include "base/memory/scoped_ptr.h"
11 #include "base/threading/thread_checker.h"
12 
13 struct libusb_context;
14 
15 namespace device {
16 
17 typedef libusb_context* PlatformUsbContext;
18 
19 // Ref-counted wrapper for libusb_context*.
20 // It also manages the life-cycle of UsbEventHandler.
21 // It is a blocking operation to delete UsbContext.
22 // Destructor must be called on FILE thread.
23 class UsbContext : public base::RefCountedThreadSafe<UsbContext> {
24  public:
context()25   PlatformUsbContext context() const { return context_; }
26 
27  protected:
28   friend class UsbServiceImpl;
29   friend class base::RefCountedThreadSafe<UsbContext>;
30 
31   explicit UsbContext(PlatformUsbContext context);
32   virtual ~UsbContext();
33 
34  private:
35   class UsbEventHandler;
36   PlatformUsbContext context_;
37   UsbEventHandler* event_handler_;
38   base::ThreadChecker thread_checker_;
39 
40   DISALLOW_COPY_AND_ASSIGN(UsbContext);
41 };
42 
43 }  // namespace device
44 
45 #endif  // DEVICE_USB_USB_CONTEXT_H_
46