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