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semaphore keng=0,tong=1,tool=1;yi-bing=0;
jia{
while(true){
while(keng>=3);
wait(tool);
开始挖坑;
signal(keng);
signal(tool);
}
}
yi{
while(true){
while(keng==0);
放入树苗;
wait(tool);
填土;
signal(keng);
signal(yi-bing);
signal(tool);
}
bing{
while(true){
while(yi-bing==0);
wait(yi-bing);
wait(tong);
...
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