private static unsafe int sys_open(sbyte *file, int flags, int mode)
{
var filename = new string(file);
var stream = VirtualFileSystem.GetFile(filename);
Debug.Write("fopen: %s\n", filename);
Heap.Free(filename);
if (stream == null)
{
return(-1);
}
var Process = Scheduler.RunningProcess;
var files = Process.Files;
int count = files.Count;
int fd = -1;
for (int index = 0; index < count; index++)
{
if (files[index] == null)
{
files[index] = stream;
fd = index;
}
}
if (fd == -1)
{
files.Add(stream);
fd = count;
}
return(fd);
}
internal void Free()
{
Heap.Free(Dead);
Heap.Free(StackBottom, StackLimit);
Heap.Free(this);
}
internal static void Collect()
{
SortObjects();
// unmark objects
int count = mAllocatedObjectCount;
for (int i = 0; i < count; i++)
{
mAllocatedObjectSize[i] &= 0x7FFFFFFF;
}
// trace stack
var threads = Scheduler.SystemProcess.Threads;
int threadcount = threads.Count;
for (int i = 0; i < threadcount; i++)
{
var thread = threads[i];
uint limit = thread.StackTop;
uint pointer = thread.StackCurrent;
while (pointer < limit)
{
MarkObject(*(uint *)pointer);
pointer += 4;
}
}
// trace global
uint start = Native.GlobalVarStart();
uint end = Native.GlobalVarEnd();
while (start < end)
{
MarkObject(*(uint *)start);
start += 4;
}
// free unmarked objects
int index = 0;
uint MemoryFreed = 0;
for (int i = 0; i < count; i++)
{
if ((mAllocatedObjectSize[i] & (1U << 31)) != 0)
{
mAllocatedObjects[index] = mAllocatedObjects[i];
mAllocatedObjectSize[index] = mAllocatedObjectSize[i];
index++;
}
else
{
MemoryFreed += mAllocatedObjectSize[i];
Heap.Free(mAllocatedObjects[i], mAllocatedObjectSize[i]);
}
}
mAllocatedObjectCount = index;
mMemoryUsage -= MemoryFreed;
Debug.Write("[GC]\tMemory Freed: %d\n", MemoryFreed);
}