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Optimize file descriptor allocation.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-08-21 00:02:37 +02:00
parent 0da847ac85
commit 156e73d441
2 changed files with 20 additions and 0 deletions
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19
kernel/dtable.cpp
View file

@ -43,6 +43,7 @@ DescriptorTable::DescriptorTable()
dtablelock = KTHREAD_MUTEX_INITIALIZER;
entries = NULL;
numentries = 0;
first_not_taken = 0;
}
DescriptorTable::~DescriptorTable()
@ -63,11 +64,16 @@ Ref<DescriptorTable> DescriptorTable::Fork()
if ( !ret ) { return Ref<DescriptorTable>(NULL); }
ret->entries = new dtableent_t[numentries];
if ( !ret->entries ) { return Ref<DescriptorTable>(NULL); }
ret->first_not_taken = 0;
for ( ret->numentries = 0; ret->numentries < numentries; ret->numentries++ )
{
int i = ret->numentries;
if ( entries[i].desc && !(entries[i].flags & FD_CLOFORK) )
{
ret->entries[i] = entries[i];
if ( i == ret->first_not_taken && i != INT_MAX )
ret->first_not_taken++;
}
else
/* Already set to NULL in dtableent_t::desc constructor. */{}
}
@ -111,13 +117,19 @@ int DescriptorTable::AllocateInternal(Ref<Descriptor> desc, int flags,
return errno = EINVAL, -1;
if ( min_index < 0 )
return errno = EINVAL, -1;
if ( min_index < first_not_taken )
min_index = first_not_taken;
for ( int i = min_index; i < numentries; i++ )
{
if ( !entries[i].desc )
{
entries[i].desc = desc;
entries[i].flags = flags;
return i;
}
if ( i == first_not_taken && i != INT_MAX )
first_not_taken++;
}
int oldnumentries = numentries;
if ( !Enlargen(min_index) )
return -1;
@ -162,6 +174,8 @@ int DescriptorTable::Copy(int from, int to, int flags)
if ( entries[to].desc )
/* TODO: Should this be synced or otherwise properly closed? */{}
entries[to].desc = entries[from].desc;
if ( to == first_not_taken && to != INT_MAX )
first_not_taken++;
}
entries[to].flags = flags;
return to;
@ -173,6 +187,8 @@ Ref<Descriptor> DescriptorTable::FreeKeep(int index)
if ( !IsGoodEntry(index) ) { errno = EBADF; return Ref<Descriptor>(NULL); }
Ref<Descriptor> ret = entries[index].desc;
entries[index].desc.Reset();
if ( index < first_not_taken )
first_not_taken = index;
return ret;
}
@ -191,6 +207,8 @@ void DescriptorTable::OnExecute()
if ( !(entries[i].flags & FD_CLOEXEC) )
continue;
entries[i].desc.Reset();
if ( i < first_not_taken )
first_not_taken = i;
}
}
@ -200,6 +218,7 @@ void DescriptorTable::Reset()
numentries = 0;
delete[] entries;
entries = NULL;
first_not_taken = 0;
}
bool DescriptorTable::SetFlags(int index, int flags)

1
kernel/include/sortix/kernel/dtable.h
View file

@ -65,6 +65,7 @@ private:
kthread_mutex_t dtablelock;
dtableent_t* entries;
int numentries;
int first_not_taken;
};