public override AllocState Alloc(string jobName, int size)
{
if (size > MemRest)
{
return new AllocState {
OutOfMemory = true
}
}
;
if (!this.All(_ => _.Name != jobName))
{
return new AllocState {
IsJobExist = true
}
}
;
MemoryBlock mem = null;
if (Mode == Modes.BF)
{ //对空闲分区按容量进行升序排序，选择首个能容纳进程的分区分配给进程
mem = FreeList.OrderBy(_ => _.Size).FirstOrDefault(_ => _.Size >= size);
}
else
{ //从空闲分区中将第一个能容纳进程的分区分配给进程
mem = FreeList.FirstOrDefault(_ => _.Size >= size);
}
var memIndex = IndexOf(mem);
if (memIndex < 0)
{
return new AllocState {
NoAvailableUnit = true
}
}
;
if ((mem.Size -= size) == 0)
{
Remove(mem);
}
Insert(memIndex, new MemoryBlock(jobName, size));
MemRest -= size;
return(new AllocState {
Success = true
});
}