以下纯属个人观点,如有不妥之处,请大家指正

对于C/C++，可变参数宏在windows和linux下是不同的。需要分别定义

#include <stdarg.h>  
​
#if defined(_WIN32)     //C99
#define dbg(level, fmt, ...)  \
    do{\
            log(LogLevel, fmt, __VA_ARGS__); \
        }   \
    }while(0)
#else //linux内核代码
#define dbg(level, fmt, args...)  \
    do{\
            log(LogLevel, fmt,##args); \
        }   \
    }while(0)
#endif

select做延迟

static void sleep_ms(int32_t ms)
{
    struct timeval timeout;
    int ret = 0;
    int32_t fd;
​
    timeout.tv_sec = 0;
    timeout.tv_usec = ms * 1000;//10ms
​
#if defined(_WIN32)
    //Sleep(ms);    //Sleep函数延迟ms精度不够
    fd_set fds;
    FD_ZERO(&fds);
    fd = socket(AF_INET, SOCK_DGRAM, 0);
    FD_SET(fd, &fds);
    ret = select(0, NULL, NULL, &fds, &timeout);
    closesocket(fd);
#else
    select(0,NULL,NULL,NULL,&timeout);
#endif
}

信号量

sem_t* sem;
​
#if __APPLE__
    sem = sem_open(SEM_NAME,O_CREAT, S_IRUSR | S_IWUSR, 0);
#else
    ret = sem_init(sem, 0, 0);
#endif

线程命名

#if __APPLE__
    #include "TargetConditionals.h"
    #if TARGET_OS_MAC
    #include <pthread.h>
    #endif
#endif  
    
#if _WIN32
    SetThreadDescription(GetCurrentThread(), "abcdThread");
#elif TARGET_OS_MAC
    pthread_setname_np("abcdThread");
#else
    prctl(PR_SET_NAME,"abcdThread");
#endif  

strcasecmp

#if _WIN32
            if (stricmp(Name, "Name") == 0) 
#else
            if (strcasecmp(Name, "Name") == 0) 
#endif

socket控制

#if _WIN32
    ioctlsocket(sock, FIONREAD, &length);
    closesocket(sock);
#else
    ioctl(sock, FIONREAD, &length);
    close(sock);
#endif

strtok_r strtok_s

char         list[123];
char*       token  = NULL;
char *      holder  = NULL;
    
#if _WIN32
    token = strtok_s(list, DP_SEPARATOR, &holder);
#else
    token = strtok_r(list, DP_SEPARATOR, &holder);
#endif

ns

static int64_t get_ns()
{
    int64_t result;
    struct timespec ts;
#if _WIN32
    LARGE_INTEGER m_liPerfFreq = { 0 };
    LARGE_INTEGER liPerfNow = { 0 };
    QueryPerformanceFrequency(&m_liPerfFreq);
    QueryPerformanceCounter(&liPerfNow);
    ts.tv_sec = (liPerfNow.QuadPart / 1000000) / m_liPerfFreq.QuadPart;
    ts.tv_nsec = (liPerfNow.QuadPart * 1000) / m_liPerfFreq.QuadPart;
#else
    clock_gettime(CLOCK_MONOTONIC, &ts);
#endif
    result = 1000000000LL * (int64_t)ts.tv_sec + (int64_t)ts.tv_nsec;
    return result;
}

*原子操作

#if _WIN32
#include <intrin.h>
#endif

int32_t atomic_add32(volatile int32_t *mem, int32_t val)
{
#if _WIN32
    return _InterlockedExchangeAdd(mem, val);
#else
    return __sync_fetch_and_add(mem, val);
#endif
}

int32_t atomic_sub32(volatile int32_t *mem, int32_t val)
{
#if _WIN32
    val = 0 - val;
    return  _InterlockedExchangeAdd(mem, val);
#else
    return  __sync_fetch_and_sub(mem, val);
#endif
}

int32_t atomic_inc32(volatile int32_t *mem)
{
#if _WIN32
    return _InterlockedIncrement(mem);
#else
    return __sync_fetch_and_add(mem, 1);
#endif
}

int32_t atomic_dec32(volatile int32_t *mem)
{
#if _WIN32
    return _InterlockedDecrement(mem);
#else
    return __sync_sub_and_fetch(mem, 1);
#endif
}

int32_t atomic_cas32(volatile int32_t *mem, int32_t with, int32_t cmp)
{
#if _WIN32
    return _InterlockedCompareExchange(mem, with, cmp);
#else
    return __sync_val_compare_and_swap(mem, cmp, with);
#endif
}