unsigned int System::attainResource(Process *process)
{
wait();
int rtn = 0;
unsigned int requestNum = process->getRequestNeed();
unsigned int available_bk = getAvailable();
unsigned int ownNeed_bk = process->getOwnNeed();
std::string prompt;
if(requestNum <= getAvailable())
{
setAvailable(getAvailable() - requestNum);
process->setOwnNeed(process->getOwnNeed() + requestNum);
prompt = prompt + "\nsystem" + "\t" + std::to_string(available_bk) + '\n';
std::cout << prompt;
prompt.clear();
if(banker(process))
{
processList.insert(process);
prompt = prompt + "Thread" + "\t" + std::to_string(process->getUid()) + "\t" + std::to_string(process->getMaxNeed()) + "\t"
+ std::to_string(process->getOwnNeed()) + "\t" + std::to_string(process->getRequestNeed()) + "\t" + "Success\n";
std::cout << prompt;
rtn = 0;
}
else
{
setAvailable(available_bk);
process->setOwnNeed(ownNeed_bk);
prompt = prompt + "Thread" + "\t" + std::to_string(process->getUid()) + "\t" + std::to_string(process->getMaxNeed()) + "\t"
+ std::to_string(process->getOwnNeed()) + "\t" + std::to_string(process->getRequestNeed()) + "\t" + "Failure\n";
std::cout << prompt;
rtn = 1;
}
printProcessList(std::cout);
}
else
{
rtn = 1;
}
release();
return rtn;
}
int main()
{
init();
while(1)
{
char ch;
printf("先检查初始状态是否安全：\n");
if(security())
{
printf("当前处于安全状态:\n");
printf("安全序列是{P%d,P%d,P%d,P%d,P%d}。\n",safeseq[0],safeseq[1],safeseq[2],safeseq[3],safeseq[4]);
}
else
{
printf("系统处于不安全状态。程序将退出...\n");
break;
}
do
{
int process;
Resource res;
PrintTable();
printf("请依次输入请求分配的进程和对三类资源的请求数量：");
scanf("%d%d%d%d",&process,&res.A,&res.B,&res.C);
if(banker(process,&res))
{
printf("分配成功。\n");
printf("安全序列是{P%d,P%d,P%d,P%d,P%d}。\n",safeseq[0],safeseq[1],safeseq[2],safeseq[3],safeseq[4]);
}
else
{
printf("分配失败。\n");
}
printf("是否继续分配？(Y/N):");
fflush(stdin);
ch=getchar();
}
while(ch=='y' || ch=='Y');
}
return 0;
}
