static int64_t path_parent_child(const char *path, const char **child, int flags)
{
int64_t parent_inum; uint max_len, leaf_idx;
mode_t leaf_type;
max_len = PAGE_SIZE;
leaf_idx = path_get_leaf(path, &leaf_type);
if ((flags & NO_DIR) && S_ISDIR(leaf_type))
return -EISDIR;
if (path[0] == '/')
assert(leaf_idx != 0);
if (leaf_idx == 0)
parent_inum = current->working_dir;
else if (leaf_idx >= max_len)
return -ENAMETOOLONG;
else {
char *parent = kmalloc(leaf_idx + 1);
memcpy(parent, path, leaf_idx);
parent[leaf_idx] = '\0';
parent_inum = name_i(parent);
kfree(parent);
if (parent_inum < 0)
return parent_inum;
}
*child = &path[leaf_idx];
return parent_inum;
}
/*
* -ENOENT, -ENOTDIR, -ENAMETOOLONG
*/
int sys_stat(const char *path, struct stat *buf)
{
uint64_t inum;
inum = name_i(path);
if (inum < 0)
return inum;
fill_statbuf(inum, buf);
return 0;
}
/*
* -ENOENT, -ENOTDIR, -ENAMETOOLONG
*/
int sys_chdir(const char *path)
{
int64_t inum;
inum = name_i(path);
if (inum < 0)
return inum;
if (!is_dir(inum))
return -ENOTDIR;
assert(inum != 0);
current->working_dir = inum;
return 0;
}
int sys_link(const char *oldpath, const char *newpath)
{
int64_t inum, parent_inum;
const char *child;
struct inode *inode;
parent_inum = path_parent_child(newpath, &child, OK_DIR);
if (parent_inum < 0)
return parent_inum;
inum = name_i(oldpath);
if (inum < 0)
return inum;
inode = inode_get(inum);
return ext2_new_dir_entry(parent_inum, inum, child,
inode_mode_to_dir_entry_type(inode->mode));
}
/*
* -EINVAL, -EEXIST, -ENOENT, -ENOTDIR, -ENAMETOOLONG, -EISDIR
*/
int sys_open(const char *path, int flags, __unused mode_t mode)
{
int64_t parent_inum, inum, fd;
struct file *file;
const char *child;
if ((flags & O_ACCMODE) == 0)
return -EINVAL;
if ((flags & O_TRUNC) &&
(flags & O_APPEND || (flags & O_WRONLY) == 0))
return -EINVAL;
inum = name_i(path);
if (flags & O_CREAT) {
if (inum > 0 && (flags & O_EXCL))
return -EEXIST;
if (inum == -ENOENT) {
parent_inum = path_parent_child(path, &child, NO_DIR);
inum = (parent_inum < 0) ? parent_inum :
file_new(parent_inum, child, EXT2_FT_REG_FILE);
}
}
if (inum < 0)
return inum;
if (is_dir(inum))
return -EISDIR;
file = kmalloc(sizeof(*file));
file_init(file, inum, flags);
fd = unrolled_insert(¤t->fdtable, file);
if (flags & O_TRUNC)
file_truncate(inum);
if (flags & O_APPEND)
assert(sys_lseek(fd, 0, SEEK_END) > 0);
return fd;
}
void BppSolver::generateBranches(real lp_value, CoupleItem couple, BranchNode& currentNode, TreeNodes& nodes)
{
BranchNode separateBranch(lp_value, couple, SEPARATE, currentNode);
BranchNode togetherBranch(lp_value, couple, TOGETHER, currentNode);
std::vector<std::size_t> cols_i;
std::vector<std::size_t> cols_j;
std::vector<std::size_t> invalide_together(BPmodel.nbVars());
std::vector<std::size_t> invalide_separate(BPmodel.nbVars());
IloExpr::LinearIterator it_i = BPmodel.getLinearCoefIterator(couple.first);
IloExpr::LinearIterator it_j = BPmodel.getLinearCoefIterator(couple.second);
bool validColumn_it;
while (it_i.ok())
{
std::string name_i(it_i.getVar().getName());
int si = std::stoi(name_i.substr(1));
validColumn_it = true;
for (auto cols : currentNode.incumbentInvalidColumns) {
if (!(validColumn_it = (cols->find(si) == cols->end())))
break;
}
if (validColumn_it)
cols_i.push_back(std::stoi(name_i.substr(1)));
++it_i;
}
while (it_j.ok())
{
std::string name_j(it_j.getVar().getName());
int sj = std::stoi(name_j.substr(1));
validColumn_it = true;
for (auto cols : currentNode.incumbentInvalidColumns) {
if (!(validColumn_it = (cols->find(sj) == cols->end())))
break;
}
if (validColumn_it)
cols_j.push_back(std::stoi(name_j.substr(1)));
++it_j;
}
std::vector<std::size_t>::iterator it;
it = std::set_intersection(cols_i.begin(), cols_i.end(), cols_j.begin(), cols_j.end(), invalide_separate.begin());
invalide_separate.resize(it - invalide_separate.begin());
for (auto i : invalide_separate)
separateBranch.invalidColumns->insert(i);
it = std::set_symmetric_difference(cols_i.begin(), cols_i.end(), cols_j.begin(), cols_j.end(), invalide_together.begin());
invalide_together.resize(it - invalide_together.begin());
for (auto i : invalide_together)
togetherBranch.invalidColumns->insert(i);
srand(time(0));
int randomval = rand() % 2;
if (randomval == 1) {
TogetherBranch(togetherBranch, separateBranch, nodes);
}
else {
SeparateBranch(togetherBranch, separateBranch, nodes);
}
}
CoupleItem BppSolver::ryanFosterCouple(BranchNode& node)
{
// get var values
auto& Xs = BPmodel.getPrimalValues();
#ifdef DBG_OUTPUT
for (int i = 0; i < BPVars.getSize(); i++)
std::cout << Xs[i] << " ";
std::cout << std::endl;
#endif
std::vector<std::size_t> vec_shuffled(Xs.getSize());
std::iota(vec_shuffled.begin(), vec_shuffled.end(), 0);
// shuffle
auto engine = std::default_random_engine(std::random_device{}());
std::shuffle(vec_shuffled.begin(), vec_shuffled.end(), engine);
std::list<std::size_t> vi(vec_shuffled.begin(), vec_shuffled.end());
std::shuffle(vec_shuffled.begin(), vec_shuffled.end(), engine);
std::list<std::size_t> vj(vec_shuffled.begin(), vec_shuffled.end());
for (auto it = vi.begin(); it != vi.end(); it++)
{
int i = *it;
auto jt = vj.begin();
while (jt != vj.end())
{
int j = *jt;
if (i == j)
jt = vj.erase(jt);
else
{
IloExpr::LinearIterator it_i = BPmodel.getLinearCoefIterator(i);
IloExpr::LinearIterator it_j = BPmodel.getLinearCoefIterator(j);
real sumVars = 0.0;
for (; ; )
{
// get index of the variables via thier names
std::string name_i(it_i.getVar().getName());
std::string name_j(it_j.getVar().getName());
// si and sj are the column index of the iterators
int si = std::stoi(name_i.substr(1));
int sj = std::stoi(name_j.substr(1));
// booleans for validity of the columns
bool validColumn_it = true;
// i and j are in the same bin
if (si == sj)
{
for (auto cols : node.incumbentInvalidColumns) {
if (!(validColumn_it = (cols->find(sj) == cols->end())))
break;
}
if (validColumn_it)
validColumn_it = (node.invalidColumns->find(si) == node.invalidColumns->end());
if (validColumn_it && (Xs[si] > 0.0))
sumVars += Xs[si];
}
// some requirement to increment the iterator
// since they itarate only over non zero coefs
if (si <= sj)
++it_i;
++it_j;
// stop condition
if (!it_i.ok() || !it_j.ok())
break;
}
real _dumy;
real frac = modf(sumVars, &_dumy);
if (frac >= 0.0001) {
return std::make_pair(i, j);
}
++jt;
}
}
}
}