From c8a6dc6c23a5efe99b4bf937003ba3f2f7f8f200 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?L=C3=A9o=20Lam?= Date: Sun, 15 Jan 2017 20:50:26 +0100 Subject: Use a single libusb context libusb on Windows is limited to only a single context. Trying to open more than one can cause device enumerations to fail randomly. libusb is thread-safe and we don't use the manual polling support (with `poll()`) so this should be safe. --- Source/Core/Common/LibusbContext.cpp | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Source/Core/Common/LibusbContext.cpp (limited to 'Source/Core/Common/LibusbContext.cpp') diff --git a/Source/Core/Common/LibusbContext.cpp b/Source/Core/Common/LibusbContext.cpp new file mode 100644 index 0000000000..a2ed128200 --- /dev/null +++ b/Source/Core/Common/LibusbContext.cpp @@ -0,0 +1,46 @@ +// Copyright 2017 Dolphin Emulator Project +// Licensed under GPLv2+ +// Refer to the license.txt file included. + +#include +#include +#include + +#include "Common/LibusbContext.h" +#include "Common/MsgHandler.h" + +namespace LibusbContext +{ +static std::shared_ptr s_libusb_context; +static std::once_flag s_context_initialized; + +static libusb_context* Create() +{ + libusb_context* context; + const int ret = libusb_init(&context); + if (ret < LIBUSB_SUCCESS) + { + bool is_windows = false; +#ifdef _WIN32 + is_windows = true; +#endif + if (is_windows && ret == LIBUSB_ERROR_NOT_FOUND) + PanicAlertT("Failed to initialize libusb because usbdk is not installed."); + else + PanicAlertT("Failed to initialize libusb: %s", libusb_error_name(ret)); + return nullptr; + } + return context; +} + +std::shared_ptr Get() +{ + std::call_once(s_context_initialized, []() { + s_libusb_context.reset(Create(), [](auto* context) { + if (context != nullptr) + libusb_exit(context); + }); + }); + return s_libusb_context; +} +} -- cgit v1.2.3