context-libusb.cpp
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1 // License: Apache 2.0. See LICENSE file in root directory.
2 // Copyright(c) 2015 Intel Corporation. All Rights Reserved.
3 
4 #include "context-libusb.h"
5 #include "../types.h"
6 
7 namespace librealsense
8 {
9  namespace platform
10  {
11  usb_context::usb_context() : _ctx(NULL), _list(NULL), _count(0)
12  {
13  auto sts = libusb_init(&_ctx);
14  if(sts != LIBUSB_SUCCESS)
15  {
16  LOG_ERROR("libusb_init failed");
17  }
18  _count = libusb_get_device_list(_ctx, &_list);
19  }
20 
22  {
23  libusb_free_device_list(_list, true);
24  assert(_handler_requests == 0); // we need the last libusb_close to trigger an event to stop the event thread
25  if (_event_handler.joinable())
26  _event_handler.join();
27  libusb_exit(_ctx);
28  }
29 
30  libusb_context* usb_context::get()
31  {
32  return _ctx;
33  }
34 
36  {
37  std::lock_guard<std::mutex> lk(_mutex);
38  if (!_handler_requests) {
39  // see "Applications which do not use hotplug support" in libusb's io.c
40  if (_event_handler.joinable()) {
41  _event_handler.join();
43  }
44  _event_handler = std::thread([this]() {
45  while (!_kill_handler_thread)
46  libusb_handle_events_completed(_ctx, &_kill_handler_thread);
47  });
48  }
50  }
51 
53  {
54  std::lock_guard<std::mutex> lk(_mutex);
56  if (!_handler_requests)
57  // the last libusb_close will trigger and event and the handler thread will notice this is set
59  }
60 
62  {
63  return index < _count ? _list[index] : NULL;
64  }
65 
67  {
68  return _count;
69  }
70  }
71 }
librealsense
Definition: algo.h:18
uint8_t
unsigned char uint8_t
Definition: stdint.h:78
librealsense::platform::usb_context::_mutex
std::mutex _mutex
Definition: context-libusb.h:32
context-libusb.h
librealsense::platform::usb_context::start_event_handler
void start_event_handler()
Definition: context-libusb.cpp:35
librealsense::platform::usb_context::_ctx
struct libusb_context * _ctx
Definition: context-libusb.h:36
index
GLuint index
Definition: glad/glad/glad.h:2777
librealsense::platform::usb_context::get_device
libusb_device * get_device(uint8_t index)
Definition: context-libusb.cpp:61
librealsense::platform::usb_context::device_count
size_t device_count()
Definition: context-libusb.cpp:66
librealsense::platform::usb_context::usb_context
usb_context()
Definition: context-libusb.cpp:11
librealsense::platform::usb_context::~usb_context
~usb_context()
Definition: context-libusb.cpp:21
NULL
#define NULL
Definition: tinycthread.c:47
librealsense::platform::usb_context::get
libusb_context * get()
Definition: context-libusb.cpp:30
librealsense::platform::usb_context::_count
size_t _count
Definition: context-libusb.h:34
librealsense::platform::usb_context::stop_event_handler
void stop_event_handler()
Definition: context-libusb.cpp:52
librealsense::platform::usb_context::_event_handler
std::thread _event_handler
Definition: context-libusb.h:38
assert
#define assert(condition)
Definition: lz4.c:245
librealsense::platform::usb_context::_kill_handler_thread
int _kill_handler_thread
Definition: context-libusb.h:37
librealsense::platform::usb_context::_list
libusb_device ** _list
Definition: context-libusb.h:33
LOG_ERROR
#define LOG_ERROR(...)
Definition: easyloggingpp.h:73
librealsense::platform::usb_context::_handler_requests
int _handler_requests
Definition: context-libusb.h:35


librealsense2
Author(s): LibRealSense ROS Team
autogenerated on Fri Aug 2 2024 08:30:01