如何在 Bash 脚本中运行编程与其他程序运行并行？

Question

我有两个程序 server 和 client。 server 在未知持续时间后终止。我想运行 client 与 server 并行（都来自同一个 Bash 脚本）并在 server 几秒后自动终止 client ] 已终止（自行终止）。

如何实现？

我可以 run multiple programs in parallel from a bash script and timeout a command in Bash without unnecessary delay, but I don’t know the execution duration of server beforehand so I can’t simply define a timeout for client. The script should continue running so exiting the script 杀死子进程不是一个选项。

编辑

This question 仅解决等待两个进程自然终止的问题，而不是如何在 server 进程终止后终止 client 进程。

@tripleee 在评论中指出 this question on Unix SE，这有效 尤其是在终止顺序无关紧要的情况下。

Answer 1

#!/bin/bash

execProgram(){
  case  in
        server)
                sleep 5 &  # <-- change "sleep 5" to your server command.
                           # use "&" for background process    
                SERVER_PID=$!
                echo "server started with pid $SERVER_PID"
                ;;
        client)
                sleep 18 &  # <-- change "sleep 18" to your client command
                            # use "&" for background process
                CLIENT_PID=$!
                echo "client started with pid $CLIENT_PID"
                ;;
  esac
}

waitForServer(){
        echo "waiting for server"
        wait $SERVER_PID
        echo "server prog is done"

}

terminateClient(){
        echo "killing client pid $CLIENT_PID after 5 seconds"
        sleep 5
        kill -15 $CLIENT_PID >/dev/null 2>&1
        wait $CLIENT_PID >/dev/null 2>&1
        echo "client terminated"
}

execProgram server && execProgram client
waitForServer && terminateClient

Answer 2

使用 GNU Parallel，您可以：

server() {
   sleep 3
   echo exit
}
client() {
   forever echo client running
}
export -f server client
# Keep client running for 5000 ms more
# then send TERM and wait 1000 ms
# then send KILL
parallel -u --termseq 0,5000,TERM,1000,KILL,1 --halt now,success=1 ::: server client

如何在 Bash 脚本中运行编程与其他程序运行并行？

How to run program in Bash script for as long as other program runs in parallel?

parallel-processing

bash

timeout

编辑

如何在 Bash 脚本中 运行 编程与其他程序 运行 并行？

How to run program in Bash script for as long as other program runs in parallel?

parallel-processing

bash

timeout

编辑

如何在 Bash 脚本中运行编程与其他程序运行并行？