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https://github.com/dolphin-emu/dolphin.git
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28d648b802
Fixes a regression which broke running several Dolphin instances at the same time on Windows. Thanks to exjam for spotting the issue pretty much immediately. Sorry about that! Also changes the file names to be more consistent on all platforms.
156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
// Copyright 2008 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 <cstddef>
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#include <cstdlib>
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#include <set>
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#include <string>
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#include "Common/CommonFuncs.h"
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "Common/MemArena.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <cerrno>
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#include <cstring>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#ifdef ANDROID
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#include <linux/ashmem.h>
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#include <sys/ioctl.h>
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#endif
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#endif
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#ifdef ANDROID
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#define ASHMEM_DEVICE "/dev/ashmem"
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static int AshmemCreateFileMapping(const char* name, size_t size)
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{
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int fd, ret;
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fd = open(ASHMEM_DEVICE, O_RDWR);
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if (fd < 0)
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return fd;
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// We don't really care if we can't set the name, it is optional
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ioctl(fd, ASHMEM_SET_NAME, name);
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ret = ioctl(fd, ASHMEM_SET_SIZE, size);
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if (ret < 0)
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{
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close(fd);
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NOTICE_LOG(MEMMAP, "Ashmem returned error: 0x%08x", ret);
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return ret;
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}
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return fd;
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}
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#endif
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void MemArena::GrabSHMSegment(size_t size)
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{
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#ifdef _WIN32
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const std::string name = "dolphin-emu." + std::to_string(GetCurrentProcessId());
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hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0,
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static_cast<DWORD>(size), UTF8ToTStr(name).c_str());
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#elif defined(ANDROID)
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fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
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if (fd < 0)
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{
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NOTICE_LOG(MEMMAP, "Ashmem allocation failed");
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return;
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}
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#else
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const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
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fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
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if (fd == -1)
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{
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ERROR_LOG(MEMMAP, "shm_open failed: %s", strerror(errno));
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return;
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}
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shm_unlink(file_name.c_str());
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if (ftruncate(fd, size) < 0)
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ERROR_LOG(MEMMAP, "Failed to allocate low memory space");
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#endif
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}
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void MemArena::ReleaseSHMSegment()
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{
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#ifdef _WIN32
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CloseHandle(hMemoryMapping);
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hMemoryMapping = 0;
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#else
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close(fd);
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#endif
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}
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void* MemArena::CreateView(s64 offset, size_t size, void* base)
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{
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#ifdef _WIN32
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return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
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#else
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void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
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MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG(MEMMAP, "mmap failed");
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return nullptr;
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}
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else
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{
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return retval;
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}
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#endif
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}
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void MemArena::ReleaseView(void* view, size_t size)
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{
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#ifdef _WIN32
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UnmapViewOfFile(view);
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#else
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munmap(view, size);
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#endif
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}
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u8* MemArena::FindMemoryBase()
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{
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#if _ARCH_32
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const size_t memory_size = 0x31000000;
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#else
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const size_t memory_size = 0x400000000;
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#endif
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#ifdef _WIN32
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u8* base = static_cast<u8*>(VirtualAlloc(nullptr, memory_size, MEM_RESERVE, PAGE_READWRITE));
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if (!base)
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{
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PanicAlert("Failed to map enough memory space: %s", GetLastErrorString().c_str());
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return nullptr;
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}
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VirtualFree(base, 0, MEM_RELEASE);
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return base;
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#else
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#ifdef ANDROID
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// Android 4.3 changed how mmap works.
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// if we map it private and then munmap it, we can't use the base returned.
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// This may be due to changes in them support a full SELinux implementation.
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const int flags = MAP_ANON | MAP_SHARED;
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#else
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const int flags = MAP_ANON | MAP_PRIVATE;
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#endif
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void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
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if (base == MAP_FAILED)
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{
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PanicAlert("Failed to map enough memory space: %s", LastStrerrorString().c_str());
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return nullptr;
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}
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munmap(base, memory_size);
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return static_cast<u8*>(base);
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#endif
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}
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