如何在Shell中實(shí)現(xiàn)“多線程”執(zhí)行腳本文件

本篇內(nèi)容介紹了“如何在Shell中實(shí)現(xiàn)“多線程”執(zhí)行腳本文件”的有關(guān)知識(shí)，在實(shí)際案例的操作過(guò)程中，不少人都會(huì)遇到這樣的困境，接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧！希望大家仔細(xì)閱讀，能夠?qū)W有所成！

即比如我有100個(gè)可執(zhí)行文件，互相間沒(méi)有特別的先后執(zhí)行關(guān)系，如CODE:

代碼如下:

job_1
job_2
job_2
.....
job_100

想用csh/bash來(lái)多線程調(diào)用執(zhí)行。

比如一次開(kāi)5個(gè)線程，那么job_1,2,3,4,5一起先開(kāi)始，那么其中任何一個(gè)線程如果先執(zhí)行完成，則繼續(xù)執(zhí)行下一個(gè)沒(méi)有初執(zhí)行過(guò)的文件，如job_6,7,8....，這樣一直以所指定的線程數(shù)來(lái)執(zhí)行所有100個(gè)文件。

我本來(lái)想用 "&" 來(lái)放入后臺(tái)，可是這樣我一次可以指定5放入后臺(tái)，但是無(wú)法知道其中任何一個(gè)程序何時(shí)執(zhí)行完畢，所以也無(wú)法繼續(xù)執(zhí)行下一個(gè)程序啊!

完美解決方案：

代碼如下:

-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; cat job_1
#!/bin/bash
n=$((RANDOM % 5 + 1))
echo "$0 sleeping for $n seconds ..."
sleep $n
echo "$0 exiting ..."
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; for ((i = 2; i <= 10; ++i)); do cp job_1 job_$i; done
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; cat jobs.sh
#!/bin/bash
nParellel=5
nJobs=10
sJobPattern='./job_%d'
aJobs=()
sNextJob=
for ((iNextJob = 1; iNextJob <= nJobs; )); do
    for ((iJob = 0; iJob < nParellel; ++iJob)); do
        if [ $iNextJob -gt $nJobs ]; then
            break;
        fi
        if [ ! "${aJobs[iJob]}" ] || ! kill -0 ${aJobs[iJob]} 2> /dev/null; then
            printf -v sNextJob "$sJobPattern" $((iNextJob++))
            echo "$sNextJob starting ..."
            $sNextJob &
            aJobs[iJob]=$!
        fi
    done
    sleep .1
done
wait
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; ./jobs.sh
./job_1 starting ...
./job_1 sleeping for 3 seconds ...
./job_2 starting ...
./job_2 sleeping for 2 seconds ...
./job_3 starting ...
./job_3 sleeping for 5 seconds ...
./job_4 starting ...
./job_5 starting ...
./job_4 sleeping for 4 seconds ...
./job_5 sleeping for 2 seconds ...
./job_2 exiting ...
./job_6 starting ...
./job_6 sleeping for 2 seconds ...
./job_5 exiting ...
./job_7 starting ...
./job_7 sleeping for 1 seconds ...
./job_1 exiting ...
./job_8 starting ...
./job_8 sleeping for 3 seconds ...
./job_7 exiting ...
./job_9 starting ...
./job_9 sleeping for 5 seconds ...
./job_4 exiting ...
./job_6 exiting ...
./job_10 starting ...
./job_10 sleeping for 5 seconds ...
./job_3 exiting ...
./job_8 exiting ...
./job_9 exiting ...
./job_10 exiting ...
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=6718 $?=0] ; bye

“如何在Shell中實(shí)現(xiàn)“多線程”執(zhí)行腳本文件”的內(nèi)容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識(shí)可以關(guān)注億速云網(wǎng)站，小編將為大家輸出更多高質(zhì)量的實(shí)用文章！