c/c++ 表示时间的数据结构有：time_t, tm
time_t 是个长整型，表示从 1970.1.1 到某个时间的秒数
tm 是 c 里面常用表示日期的数据结构
struct tm{
int tm_sec;
int tm_min;
int tm_hour;
int tm_mday;
int tm_mon;
int tm_year;
int tm_wday;
int tm_yday;
int tm_isdst;
};
可以通过 localtime_s/localtime_r 将 time_t 转换成 tm; 通过 mktime 将 tm 转换成 time_t
chrono
time_t, chrono::system_clock
const std::time_t t = std::time(nullptr); // usually has "1 second" precision
const auto from = std::chrono::system_clock::from_time_t(t);
- Current timestamp in nanoseconds, milliseconds, seconds
- Date format: YYYYMMDD
字符编码转换
- Convert std::wstring to std::string(UTF-8)
- Convert std::string(UTF-8) to std::wstring
字符串拼接
std::string result = absl::StrCat("abc", "efg");
- Open and Close File
- Read file into std::string
- Write bytes into file
- Create/Remove Dir
- Check if Dir exists
- SmallVector: dynamic array on stack
-
同步
-
异步
互斥 ksMutex
信号 ksSignal
线程 ksThread
// 创建线程，刚创建完处于挂起状态
void Backup(void*) {}
ksThread backupThread;
ksThread_Create(&backupThread, "Backup", Backup, nullptr);
// 激发线程，在线程执行过程中激发多次不会导致线程执行多次
// 线程执行完又会进入挂起状态直到下次被激发
ksThread_Signal(&backupThread);
//
线程池 ksThreadPool
// 创建线程池
ksThreadPool threadPool;
ksThreadPool_Create( &threadPool, 4 );
// 向线程池中提交任务
struct MyData{} data;
void WorkingThread(MyData* data);
ksThreadPool_Submit( &threadPool, (ksThreadFunction)WorkingThread, &data );
// 启动
ksThreadPool_Join( &threadPool );
// 销毁线程池
ksThreadPool_Destroy( &threadPool );