isspecial variable that holds thereturnvalue of the recently executed command. echo"Process with PID $pid has finished with Exit status: $?"
6Advanced Usage of the wait Command 7Conclusion Understanding the Bash wait Command The wait command in Bash is a built-in function that halts the execution of the current shell until the specified jobs have finished. It then returns the exit status of the command for which it was waiting. ...
在linux环境下,我们使用man system看到system函数的信息如下: #include <stdlib.h> int system(const char *command); 1. 2. 3. 我们可以在linux环境中使用system函数执行系统指令。command是一个字符串指针,指向表示命令的字符串。system函数可以执行系统命令,同时也可以调用fork、exec、waitpid。 接下来我们试一试:...
command = msgRecvQueue.front();//返回第一个元素,但不检查元素是否存在 msgRecvQueue.pop_front();//移除第一个元素 return true; } } return false; } //把数据从消息队列中取出线程 void outMsgRecvQueue() { int command =0; for(int i=0;i<10000;++i) { bool result=outMsgProc(command); ...
TID PRIO USER DISK READ DISK WRITE SWAPIN IO>COMMAND15758be/4root7.99M/s8.01M/s0.00%61.97%bonnie++-n0-u0-r239-s478-f-b-d/tmp 查看哪个进程使用硬盘最多的最简单的方法就是使用iotop命令。通过查看数据,我们很容易就能确定是bonnie++这个进程引起我们机器高I/O ...
VDI_CLIENT_COMPLETECOMMAND 仅供内部使用。适用于:SQL Server 2014 (12.x) 及更高版本。 VDI_CLIENT_GETCOMMAND 仅供内部使用。适用于:SQL Server 2014 (12.x) 及更高版本。 VDI_CLIENT_OPERATION 仅供内部使用。适用于:SQL Server 2014 (12.x) 及更高版本。 VD...
#include <linux/spinlock.h> #include <asm/current.h> #include <uapi/linux/wait.h> typedef struct wait_queue_entry wait_queue_entry_t; typedef int (*wait_queue_func_t)(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key); ...
wait-on is a cross-platform command line utility which will wait for files, ports, sockets, and http(s) resources to become available (or not available using reverse mode). Functionality is also available via a Node.js API. Cross-platform - runs everywhere Node.js runs (linux, unix, mac...
The advantage of pwait over the pwait_poll shell function above is that the full pwait can give you the exit code of the process you use it on, which is useful when you need to know whether a command in another terminal completed successfully. ...
Use an SSH remote connection tool to log in to the Linux operating system as the sopuser user. Switch to the root user. su - root Password: password of the root user Modify the configuration file to modify operating system kernel parameters. Run...