// This method accepts a code pointer and allows the NativeDelegateRecord
// associated with it to be collected. In order to call this method
// safely it must be certain that no references to the code ptr exist
// in native code.
private static unsafe void ReleaseCodePtr(IntPtr codePtr)
{
byte * codeBuffer = (byte *)codePtr.ToPointer();
int idx = *(int *)(codeBuffer + 7);
Delegate del = IdxToDelegate(idx);
del.CodePtr = IntPtr.Zero;
CriticalSection.AcquireMutex();
try {
FreeNativeDelegateRecord(idx);
}
finally {
CriticalSection.ReleaseMutex();
}
FixedFree(codePtr);
}
private static IntPtr GetCodePtr(Delegate d, IntPtr callBackStub)
{
IntPtr codePtr = d.CodePtr;
if (codePtr == IntPtr.Zero)
{
CriticalSection.AcquireMutex();
try {
codePtr = d.CodePtr;
if (codePtr == IntPtr.Zero)
{
int idx = AllocateNativeDelegateRecord(d);
codePtr = CreateCodePtr(idx, callBackStub);
d.CodePtr = codePtr;
}
}
finally {
CriticalSection.ReleaseMutex();
}
}
return(codePtr);
}