/*static*/ void* MongoMMF::switchToPrivateView(void *readonly_ptr) {
assert( cmdLine.dur );
assert( testIntent );
void *p = readonly_ptr;
{
size_t ofs=0;
MongoMMF *mmf = ourReadViews.find(p, ofs);
if( mmf ) {
void *res = ((char *)mmf->_view_private) + ofs;
return res;
}
}
{
size_t ofs=0;
MongoMMF *mmf = privateViews.find(p, ofs);
if( mmf ) {
log() << "dur: perf warning p=" << p << " is already in the writable view of " << mmf->filename() << endl;
return p;
}
}
// did you call writing() with a pointer that isn't into a datafile?
log() << "dur error switchToPrivateView " << p << endl;
return p;
}
/* switch to _view_write. normally, this is a bad idea since your changes will not
show up in _view_private if there have been changes there; thus the leading underscore
as a tad of a "warning". but useful when done with some care, such as during
initialization.
*/
void* MongoMMF::_switchToWritableView(void *p) {
size_t ofs;
MongoMMF *f = privateViews.find(p, ofs);
assert( f );
return (((char *)f->_view_write)+ofs);
}