1. The Stat Family #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> int stat(const char *path, struct stat *buf); int fstat(int fd, struct stat *buf); int lstat(const char *path, struct stat *buf); struct stat{ dev_t…
1. 内核提供三种不同的方式来记录时间 Wall time (or real time):actual time and date in the real world Process time:the time that a process spends executing on a processor 包括用户时间user time 和 系统时间system time Monotonic time:use the system's uptime (time since boot) for th…
1. Threading is the creation and management of multiple units of execution within a single process 二进制文件是驻留在存储介质上,已被编译成操作系统可以使用,准备执行但没有正运行的休眠程序 进程是操作系统对 正在执行中的二进制文件的抽象:已加载的二进制.虚拟内存.内核资源 线程是进程内的执行单元 processes are running binaries, threads are the smal…
1. 进程调度 the process scheduler is the component of a kernel that selects which process to run next. 进程调度器需要使 处理器使用率最大化,并且提供 使多个进程并发执行的虚拟 Deciding which processes run, when, and for how long is the process scheduler's fundamental responsibility. 时间…
1. Scatter/Gather I/O a single system call to read or write data between single data stream and multiple buffers This type of I/O is so named because the data is scattered into or gathered from the given vector of buffers Scatter/Gather I/O 相比于 C标准…
