forked from dolphin-emu/dolphin
c8a6dc6c23
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.
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <libusb.h>
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#include <memory>
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#include <mutex>
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#include "Common/LibusbContext.h"
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#include "Common/MsgHandler.h"
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namespace LibusbContext
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{
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static std::shared_ptr<libusb_context> s_libusb_context;
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static std::once_flag s_context_initialized;
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static libusb_context* Create()
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{
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libusb_context* context;
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const int ret = libusb_init(&context);
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if (ret < LIBUSB_SUCCESS)
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{
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bool is_windows = false;
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#ifdef _WIN32
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is_windows = true;
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#endif
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if (is_windows && ret == LIBUSB_ERROR_NOT_FOUND)
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PanicAlertT("Failed to initialize libusb because usbdk is not installed.");
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else
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PanicAlertT("Failed to initialize libusb: %s", libusb_error_name(ret));
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return nullptr;
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}
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return context;
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}
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std::shared_ptr<libusb_context> Get()
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{
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std::call_once(s_context_initialized, []() {
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s_libusb_context.reset(Create(), [](auto* context) {
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if (context != nullptr)
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libusb_exit(context);
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});
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});
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return s_libusb_context;
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}
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}
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