盒子
盒子
文章目录
  1. system info
    1. c++ 11
    2. win32
    3. linux
  2. sleep
  3. time
    1. win32
    2. cross platform
  4. file system
    1. win32
    2. cross platform
  5. _stdcall
  6. thread
  7. char util
  8. atomic
  9. CONDITION_VARIABLE
    1. win32
    2. std
  10. mutex
    1. win32
    2. std

Porting windows cpp api to linux

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#ifdef PLATFORM_UNIX
#define ZeroMemory(Destination,Length) memset((Destination),0,(Length))
#endif

windows CaptureStackBackTrace -> Linux backtrace

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//to reserve virtual address space
//equivalent of VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS)
void* ptr = mmap(NULL, size, PROT_NONE, (MAP_PRIVATE | MAP_ANON), -1, 0);
msync(ptr, size, (MS_SYNC | MS_INVALIDATE));
//to free ALL virtual address space
//equivalent of VirtualFree(addr, 0, MEM_RELEASE)
//where "size" is the size of the entire virtual address space and "addr" the starting address
msync(addr, size, MS_SYNC);
munmap(addr, size);
//to allocate physical memory
//equivalent of VirtualAlloc(addr, size, MEM_COMMIT, PAGE_READWRITE)
void* ptr = mmap(addr, size, (PROT_READ | PROT_WRITE), (MAP_FIXED | MAP_SHARED | MAP_ANON), -1, 0);
msync(addr, size, (MS_SYNC | MS_INVALIDATE));
// instead of unmapping the address, we're just gonna trick
// the TLB to mark this as a new mapped area which, due to
// demand paging, will not be committed until used. VirtualFree(addr, size, MEM_DECOMMIT);
mmap(addr, size, PROT_NONE, MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
msync(addr, size, MS_SYNC|MS_INVALIDATE);

system info

c++ 11

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//may return 0 when not able to detect
unsigned concurentThreadsSupported = std::thread::hardware_concurrency();

win32

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SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
int numCPU = sysinfo.dwNumberOfProcessors;
printf("%s %d\n\n", "PageSize[Bytes] :", sysInfo.dwPageSize);
MEMORYSTATUSEX mem;
mem.dwLength = sizeof(mem);
LogAssert(GlobalMemoryStatusEx(&mem));
UInt32 totalPhysicalMemoryInMB = static_cast<UInt32>(mem.ullTotalPhys / c_BytesPerMegabyte);

linux

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int numCPU = sysconf(_SC_NPROCESSORS_ONLN);
long pagesize = sysconf(_SC_PAGE_SIZE);

sysinfo

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#include "sys/sysinfo.h"
struct sysinfo memInfo;
sysinfo (&memInfo);
long long totalVirtualMem = memInfo.totalram;
//Add other values in next statement to avoid int overflow on right hand side...
totalVirtualMem += memInfo.totalswap;
totalVirtualMem *= memInfo.mem_unit;
long long virtualMemUsed = memInfo.totalram - memInfo.freeram;
//Add other values in next statement to avoid int overflow on right hand side...
virtualMemUsed += memInfo.totalswap - memInfo.freeswap;
virtualMemUsed *= memInfo.mem_unit;
long long totalPhysMem = memInfo.totalram;
//Multiply in next statement to avoid int overflow on right hand side...
totalPhysMem *= memInfo.mem_unit;
long long physMemUsed = memInfo.totalram - memInfo.freeram;
//Multiply in next statement to avoid int overflow on right hand side...
physMemUsed *= memInfo.mem_unit;

sleep

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void Sleep(
DWORD dwMilliseconds
);
std::this_thread::sleep_for(std::chrono::milliseconds(100));

time

win32

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GetSystemTimeAsFileTime
LPFILETIME
FILETIME

cross platform

chrono

std::chrono::system_clock::now()

file system

win32

WIN32_FIND_DATAA FindFirstFileA FindNextFileA GetTempPathA

cross platform

boost::filesystem

some example in SO

use boost regex as a mask

temp_directory_path

_stdcall

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// https://stackoverflow.com/questions/52713849/why-does-gcc-ignore-attribute-stdcall
#ifndef XRAND2_API
#ifndef PLATFORM_UNIX
#define XRAND2_API __stdcall
#else
#define XRAND2_API __attribute__((stdcall))
#endif
#ifdef PLATFORM_UNIX
#define CDECAL_MODIFIER __attribute__((cdecl))
#else
#define CDECAL_MODIFIER __cdecl
#endif

一些windows下的type的定义,type

thread

std::thread 可以变为linux或者win32自己的thread,设置优先级 native_handle

char util

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strcpy_s -> strcpy
// but this will lead a problem, if the dest char array is not initilized, the result will be wrong.!
strncpy_s -> strncpy https://zh.cppreference.com/w/c/string/byte/strncpy _TRUNCATE is size of dest
_snprintf -> snprintf
sprintf_s -> snprintf
strncat_s -> strncat https://zh.cppreference.com/w/c/string/byte/strncat
strcat_s -> strcat https://zh.cppreference.com/w/c/string/byte/strcat
sscanf_s -> sscanf
StringCchPrintfA -> snprintf
printf UInt64 I64u

atomic

  • Interlockedxxx -> std::atomic
  • InterlockedIncrement -> atomic_inc
  • InterlockedDecrement -> atomic_dec

    CONDITION_VARIABLE

    win32

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    CONDITION_VARIABLE
    WakeAllConditionVariable
    InitializeConditionVariable
    InitializeCriticalSectionAndSpinCount
    WakeConditionVariable

std

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condition_variable
wait
wait_for
notify_one
notify_all

mutex

win32

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CRITICAL_SECTION
EnterCriticalSection
LeaveCriticalSection
InitializeCriticalSectionAndSpinCount
SleepConditionVariableCS

std

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std::mutex
lock
unlock

呼呼呼山(http://code4fun.me)
2019-04-15 15:40:13