void dump::dump_live_values(container_node &n, bool before) {
if (before) {
if (!n.live_before.empty()) {
sblog << "live_before: ";
dump_set(sh, n.live_before);
}
} else {
if (!n.live_after.empty()) {
sblog << "live_after: ";
dump_set(sh, n.live_after);
}
}
sblog << "\n";
}
bool dump::visit(region_node& n, bool enter) {
if (enter) {
indent();
dump_flags(n);
sblog << "region #" << n.region_id << " ";
dump_common(n);
if (!n.vars_defined.empty()) {
sblog << "vars_defined: ";
dump_set(sh, n.vars_defined);
}
dump_live_values(n, true);
++level;
if (n.loop_phi)
run_on(*n.loop_phi);
} else {
--level;
if (n.phi)
run_on(*n.phi);
indent();
dump_live_values(n, false);
}
return true;
}
static void test_set(void)
{
Set *set = set_create();
if (set == 0)
err_syserr("Out of memory\n");
load_set(set, 1, 3, 4, 6);
dump_set("S0", set);
set_destroy(set);
}
static void test_ops(void)
{
Set *s1 = set_create();
Set *s2 = set_create();
Set *s3 = set_create();
if (s1 == 0 || s2 == 0 || s3 == 0)
err_syserr("Out of memory\n");
load_set(s1, 1, 3, 4, 6);
dump_set("S1", s1);
load_set(s2, 2, 5, 7, 9);
dump_set("S2", s2);
set_union(s1, s2, s3);
dump_set("S1 union S2", s3);
set_empty(s3);
set_intersect(s1, s2, s3);
dump_set("S1 intersect S2", s3);
set_empty(s3);
set_difference(s1, s2, s3);
dump_set("S1 minus S2", s3);
set_empty(s3);
set_difference(s2, s1, s3);
dump_set("S2 minus S1", s3);
set_destroy(s1);
set_destroy(s2);
set_destroy(s3);
}
int CHOLMOD(updown_mark)
(
/* ---- input ---- */
int update, /* TRUE for update, FALSE for downdate */
cholmod_sparse *C, /* the incoming sparse update */
Int *colmark, /* Int array of size n. See cholmod_updown.c */
/* ---- in/out --- */
cholmod_factor *L, /* factor to modify */
cholmod_dense *X, /* solution to Lx=b (size n-by-1) */
cholmod_dense *DeltaB, /* change in b, zero on output */
Int *rowmark, /* Int array of size n. See cholmod_updown.c */
/* --------------- */
cholmod_common *Common
)
{
double xj, fl ;
double *Lx, *W, *Xx, *Nx ;
Int *Li, *Lp, *Lnz, *Cp, *Ci, *Cnz, *Head, *Flag, *Stack, *Lnext, *Iwork,
*Set_ps1 [32], *Set_ps2 [32], *ps1, *ps2 ;
size_t maxrank ;
Path_type OrderedPath [32], Path [32] ;
Int n, wdim, k1, k2, npaths, i, j, row, packed, ccol, p, cncol, do_solve,
mark, jj, j2, kk, nextj, p1, p2, c, use_rowmark, use_colmark, newlnz,
k, newpath, path_order, w_order, scattered, path, newparent, pp1, pp2,
smax, maxrow, row1, nsets, s, p3, newlnz1, Set [32], top, len, lnz, m,
botrow ;
DEBUG (Int oldparent) ;
/* ---------------------------------------------------------------------- */
/* check inputs */
/* ---------------------------------------------------------------------- */
RETURN_IF_NULL_COMMON (FALSE) ;
RETURN_IF_NULL (C, FALSE) ;
RETURN_IF_NULL (L, FALSE) ;
RETURN_IF_XTYPE_INVALID (L, CHOLMOD_PATTERN, CHOLMOD_REAL, FALSE) ;
RETURN_IF_XTYPE_INVALID (C, CHOLMOD_REAL, CHOLMOD_REAL, FALSE) ;
n = L->n ;
cncol = C->ncol ;
Common->modfl = 0 ;
if (!(C->sorted))
{
ERROR (CHOLMOD_INVALID, "C must have sorted columns") ;
return (FALSE) ;
}
if (n != (Int) (C->nrow))
{
ERROR (CHOLMOD_INVALID, "C and L dimensions do not match") ;
return (FALSE) ;
}
do_solve = (X != NULL) && (DeltaB != NULL) ;
if (do_solve)
{
RETURN_IF_XTYPE_INVALID (X, CHOLMOD_REAL, CHOLMOD_REAL, FALSE) ;
RETURN_IF_XTYPE_INVALID (DeltaB, CHOLMOD_REAL, CHOLMOD_REAL, FALSE) ;
Xx = X->x ;
Nx = DeltaB->x ;
if (X->nrow != L->n || X->ncol != 1 || DeltaB->nrow != L->n ||
DeltaB->ncol != 1 || Xx == NULL || Nx == NULL)
{
ERROR (CHOLMOD_INVALID, "X and/or DeltaB invalid") ;
return (FALSE) ;
}
}
else
{
Xx = NULL ;
Nx = NULL ;
}
Common->status = CHOLMOD_OK ;
fl = 0 ;
use_rowmark = (rowmark != NULL) ;
use_colmark = (colmark != NULL) ;
/* ---------------------------------------------------------------------- */
/* allocate workspace */
/* ---------------------------------------------------------------------- */
/* Note: cholmod_rowadd and cholmod_rowdel use the second n doubles in
* Common->Xwork for Cx, and then perform a rank-1 update here, which uses
* the first n doubles in Common->Xwork. Both the rowadd and rowdel
* routines allocate enough workspace so that Common->Xwork isn't destroyed
* below. Also, both cholmod_rowadd and cholmod_rowdel use the second n
* ints in Common->Iwork for Ci.
*/
/* make sure maxrank is in the proper range */
maxrank = CHOLMOD(maxrank) (n, Common) ;
k = MIN (cncol, (Int) maxrank) ; /* maximum k is wdim */
wdim = Power2 [k] ; /* number of columns needed in W */
ASSERT (wdim <= (Int) maxrank) ;
PRINT1 (("updown wdim final "ID" k "ID"\n", wdim, k)) ;
CHOLMOD(allocate_work) (n, n, wdim * n, Common) ;
if (Common->status < CHOLMOD_OK || maxrank == 0)
{
/* out of memory, L is returned unchanged */
return (FALSE) ;
}
/* ---------------------------------------------------------------------- */
/* convert to simplicial numeric LDL' factor, if not already */
/* ---------------------------------------------------------------------- */
if (L->xtype == CHOLMOD_PATTERN || L->is_super || L->is_ll)
{
/* can only update/downdate a simplicial LDL' factorization */
CHOLMOD(change_factor) (CHOLMOD_REAL, FALSE, FALSE, FALSE, FALSE, L,
Common) ;
if (Common->status < CHOLMOD_OK)
{
/* out of memory, L is returned unchanged */
return (FALSE) ;
}
}
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
mark = CHOLMOD(clear_flag) (Common) ;
PRINT1 (("updown, rank %ld update %d\n", (long) C->ncol, update)) ;
DEBUG (CHOLMOD(dump_factor) (L, "input L for updown", Common)) ;
ASSERT (CHOLMOD(dump_sparse) (C, "input C for updown", Common) >= 0) ;
Ci = C->i ;
Cp = C->p ;
Cnz = C->nz ;
packed = C->packed ;
ASSERT (IMPLIES (!packed, Cnz != NULL)) ;
/* ---------------------------------------------------------------------- */
/* quick return */
/* ---------------------------------------------------------------------- */
if (cncol <= 0 || n == 0)
{
/* nothing to do */
return (TRUE) ;
}
/* ---------------------------------------------------------------------- */
/* get L */
/* ---------------------------------------------------------------------- */
Li = L->i ;
Lx = L->x ;
Lp = L->p ;
Lnz = L->nz ;
Lnext = L->next ;
ASSERT (Lnz != NULL) ;
/* ---------------------------------------------------------------------- */
/* get workspace */
/* ---------------------------------------------------------------------- */
Flag = Common->Flag ; /* size n, Flag [i] <= mark must hold */
Head = Common->Head ; /* size n, Head [i] == EMPTY must hold */
W = Common->Xwork ; /* size n-by-wdim, zero on input and output*/
/* note that Iwork [n .. 2*n-1] (i/i/l) may be in use in rowadd/rowdel: */
Iwork = Common->Iwork ;
Stack = Iwork ; /* size n, uninitialized (i/i/l) */
/* ---------------------------------------------------------------------- */
/* entire rank-cncol update, done as a sequence of rank-k updates */
/* ---------------------------------------------------------------------- */
ps1 = NULL ;
ps2 = NULL ;
for (k1 = 0 ; k1 < cncol ; k1 += k)
{
/* ------------------------------------------------------------------ */
/* get the next k columns of C for the update/downdate */
/* ------------------------------------------------------------------ */
/* the last update/downdate might be less than rank-k */
if (k > cncol - k1)
{
k = cncol - k1 ;
wdim = Power2 [k] ;
}
k2 = k1 + k - 1 ;
/* workspaces are in the following state, on input and output */
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, wdim, Common)) ;
/* ------------------------------------------------------------------ */
/* create a zero-length path for each column of W */
/* ------------------------------------------------------------------ */
nextj = n ;
path = 0 ;
for (ccol = k1 ; ccol <= k2 ; ccol++)
{
PRINT1 (("Column ["ID"]: "ID"\n", path, ccol)) ;
ASSERT (ccol >= 0 && ccol <= cncol) ;
pp1 = Cp [ccol] ;
pp2 = (packed) ? (Cp [ccol+1]) : (pp1 + Cnz [ccol]) ;
/* get the row index j of the first entry in C (:,ccol) */
if (pp2 > pp1)
{
/* Column ccol of C has at least one entry. */
j = Ci [pp1] ;
}
else
{
/* Column ccol of C is empty. Pretend it has one entry in
* the last column with numerical value of zero. */
j = n-1 ;
}
ASSERT (j >= 0 && j < n) ;
/* find first column to work on */
nextj = MIN (nextj, j) ;
Path [path].ccol = ccol ; /* which column of C this path is for */
Path [path].start = EMPTY ; /* paths for C have zero length */
Path [path].end = EMPTY ;
Path [path].parent = EMPTY ; /* no parent yet */
Path [path].rank = 1 ; /* one column of W */
Path [path].c = EMPTY ; /* no child of this path (case A) */
Path [path].next = Head [j] ; /* this path is pending at col j */
Path [path].pending = j ; /* this path is pending at col j */
Head [j] = path ; /* this path is pending at col j */
PRINT1(("Path "ID" starts: start "ID" end "ID" parent "ID" c "ID""
"j "ID" ccol "ID"\n", path, Path [path].start,
Path [path].end, Path [path].parent,
Path [path].c, j, ccol)) ;
path++ ;
}
/* we start with paths 0 to k-1. Next one (now unused) is npaths */
npaths = k ;
j = nextj ;
ASSERT (j < n) ;
scattered = FALSE ;
/* ------------------------------------------------------------------ */
/* symbolic update of columns of L */
/* ------------------------------------------------------------------ */
while (j < n)
{
ASSERT (j >= 0 && j < n && Lnz [j] > 0) ;
/* the old column, Li [p1..p2-1]. D (j,j) is stored in Lx [p1] */
p1 = Lp [j] ;
newlnz = Lnz [j] ;
p2 = p1 + newlnz ;
#ifndef NDEBUG
PRINT1 (("\n=========Column j="ID" p1 "ID" p2 "ID" lnz "ID" \n",
j, p1, p2, newlnz)) ;
dump_col ("Old", j, p1, p2, Li, Lx, n, Common) ;
oldparent = (Lnz [j] > 1) ? (Li [p1 + 1]) : EMPTY ;
ASSERT (CHOLMOD(dump_work) (TRUE, FALSE, 0, Common)) ;
ASSERT (!scattered) ;
PRINT1 (("Col "ID": Checking paths, npaths: "ID"\n", j, npaths)) ;
for (kk = 0 ; kk < npaths ; kk++)
{
Int kk2, found, j3 = Path [kk].pending ;
PRINT2 (("Path "ID" pending at "ID".\n", kk, j3)) ;
if (j3 != EMPTY)
{
/* Path kk must be somewhere in link list for column j3 */
ASSERT (Head [j3] != EMPTY) ;
PRINT3 ((" List at "ID": ", j3)) ;
found = FALSE ;
for (kk2 = Head [j3] ; kk2 != EMPTY ; kk2 = Path [kk2].next)
{
PRINT3 ((""ID" ", kk2)) ;
ASSERT (Path [kk2].pending == j3) ;
found = found || (kk2 == kk) ;
}
PRINT3 (("\n")) ;
ASSERT (found) ;
}
}
PRINT1 (("\nCol "ID": Paths at this column, head "ID"\n",
j, Head [j]));
ASSERT (Head [j] != EMPTY) ;
for (kk = Head [j] ; kk != EMPTY ; kk = Path [kk].next)
{
PRINT1 (("path "ID": (c="ID" j="ID") npaths "ID"\n",
kk, Path[kk].c, j, npaths)) ;
ASSERT (kk >= 0 && kk < npaths) ;
ASSERT (Path [kk].pending == j) ;
}
#endif
/* -------------------------------------------------------------- */
/* update/downdate of forward solve, Lx=b */
/* -------------------------------------------------------------- */
if (do_solve)
{
xj = Xx [j] ;
if (IS_NONZERO (xj))
{
xj = Xx [j] ;
/* This is first time column j has been seen for entire */
/* rank-k update/downdate. */
/* DeltaB += Lold (j:botrow-1,j) * X (j) */
Nx [j] += xj ; /* diagonal of L */
botrow = (use_rowmark) ? (rowmark [j]) : n ;
for (p = p1 + 1 ; p < p2 ; p++)
{
i = Li [p] ;
if (i >= botrow)
{
break ;
}
Nx [i] += Lx [p] * xj ;
}
/* clear X[j] to flag col j of Lold as having been seen. If
* X (j) was initially zero, then the above code is never
* executed for column j. This is safe, since if xj=0 the
* code above does not do anything anyway. */
Xx [j] = 0.0 ;
}
}
/* -------------------------------------------------------------- */
/* start a new path at this column if two or more paths merge */
/* -------------------------------------------------------------- */
/* get the first old path at column j */
path = Head [j] ;
newpath =
/* start a new path if paths have merged */
(Path [path].next != EMPTY)
/* or if j is the first node on a path (case A). */
|| (Path [path].c == EMPTY) ;
if (newpath)
{
path = npaths++ ;
ASSERT (npaths <= 3*k) ;
Path [path].ccol = EMPTY ; /* no single col of C for this path*/
Path [path].start = j ; /* path starts at this column j */
Path [path].end = EMPTY ; /* don't know yet where it ends */
Path [path].parent = EMPTY ;/* don't know parent path yet */
Path [path].rank = 0 ; /* rank is sum of child path ranks */
PRINT1 (("Path "ID" starts: start "ID" end "ID" parent "ID"\n",
path, Path [path].start, Path [path].end, Path [path].parent)) ;
}
/* -------------------------------------------------------------- */
/* for each path kk pending at column j */
/* -------------------------------------------------------------- */
/* make a list of the sets that need to be merged into column j */
nsets = 0 ;
for (kk = Head [j] ; kk != EMPTY ; kk = Path [kk].next)
{
/* ---------------------------------------------------------- */
/* path kk is at (c,j) */
/* ---------------------------------------------------------- */
c = Path [kk].c ;
ASSERT (c < j) ;
PRINT1 (("TUPLE on path "ID" (c="ID" j="ID")\n", kk, c, j)) ;
ASSERT (Path [kk].pending == j) ;
if (newpath)
{
/* finalize path kk and find rank of this path */
Path [kk].end = c ; /* end of old path is previous node c */
Path [kk].parent = path ; /* parent is this path */
Path [path].rank += Path [kk].rank ; /* sum up ranks */
Path [kk].pending = EMPTY ;
PRINT1 (("Path "ID" done:start "ID" end "ID" parent "ID"\n",
kk, Path [kk].start, Path [kk].end, Path [kk].parent)) ;
}
if (c == EMPTY)
{
/* ------------------------------------------------------ */
/* CASE A: first node in path */
/* ------------------------------------------------------ */
/* update: add pattern of incoming column */
/* Column ccol of C is in Ci [pp1 ... pp2-1] */
ccol = Path [kk].ccol ;
pp1 = Cp [ccol] ;
pp2 = (packed) ? (Cp [ccol+1]) : (pp1 + Cnz [ccol]) ;
PRINT1 (("Case A, ccol = "ID" len "ID"\n", ccol, pp2-pp1)) ;
ASSERT (IMPLIES (pp2 > pp1, Ci [pp1] == j)) ;
if (!scattered)
{
/* scatter the original pattern of column j of L */
for (p = p1 ; p < p2 ; p++)
{
Flag [Li [p]] = mark ;
}
scattered = TRUE ;
}
/* scatter column ccol of C (skip first entry, j) */
newlnz1 = newlnz ;
for (p = pp1 + 1 ; p < pp2 ; p++)
{
row = Ci [p] ;
if (Flag [row] < mark)
{
/* this is a new entry in Lj' */
Flag [row] = mark ;
newlnz++ ;
}
}
if (newlnz1 != newlnz)
{
/* column ccol of C adds something to column j of L */
Set [nsets++] = FLIP (ccol) ;
}
}
else if (Head [c] == 1)
{
/* ------------------------------------------------------ */
/* CASE B: c is old, but changed, child of j */
/* CASE C: new child of j */
/* ------------------------------------------------------ */
/* Head [c] is 1 if col c of L has new entries,
* EMPTY otherwise */
Flag [c] = 0 ;
Head [c] = EMPTY ;
/* update: add Lc' */
/* column c of L is in Li [pp1 .. pp2-1] */
pp1 = Lp [c] ;
pp2 = pp1 + Lnz [c] ;
PRINT1 (("Case B/C: c = "ID"\n", c)) ;
DEBUG (dump_col ("Child", c, pp1, pp2, Li, Lx, n, Common)) ;
ASSERT (j == Li [pp1 + 1]) ; /* j is new parent of c */
if (!scattered)
{
/* scatter the original pattern of column j of L */
for (p = p1 ; p < p2 ; p++)
{
Flag [Li [p]] = mark ;
}
scattered = TRUE ;
}
/* scatter column c of L (skip first two entries, c and j)*/
newlnz1 = newlnz ;
for (p = pp1 + 2 ; p < pp2 ; p++)
{
row = Li [p] ;
if (Flag [row] < mark)
{
/* this is a new entry in Lj' */
Flag [row] = mark ;
newlnz++ ;
}
}
PRINT2 (("\n")) ;
if (newlnz1 != newlnz)
{
/* column c of L adds something to column j of L */
Set [nsets++] = c ;
}
}
}
/* -------------------------------------------------------------- */
/* update the pattern of column j of L */
/* -------------------------------------------------------------- */
/* Column j of L will be in Li/Lx [p1 .. p3-1] */
p3 = p1 + newlnz ;
ASSERT (IMPLIES (nsets == 0, newlnz == Lnz [j])) ;
PRINT1 (("p1 "ID" p2 "ID" p3 "ID" nsets "ID"\n", p1, p2, p3,nsets));
/* -------------------------------------------------------------- */
/* ensure we have enough space for the longer column */
/* -------------------------------------------------------------- */
if (nsets > 0 && p3 > Lp [Lnext [j]])
{
PRINT1 (("Col realloc: j "ID" newlnz "ID"\n", j, newlnz)) ;
if (!CHOLMOD(reallocate_column) (j, newlnz, L, Common))
{
/* out of memory, L is now simplicial symbolic */
CHOLMOD(clear_flag) (Common) ;
for (j = 0 ; j <= n ; j++)
{
Head [j] = EMPTY ;
}
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, wdim, Common)) ;
return (FALSE) ;
}
/* L->i and L->x may have moved. Column j has moved too */
Li = L->i ;
Lx = L->x ;
p1 = Lp [j] ;
p2 = p1 + Lnz [j] ;
p3 = p1 + newlnz ;
}
/* -------------------------------------------------------------- */
/* create set pointers */
/* -------------------------------------------------------------- */
for (s = 0 ; s < nsets ; s++)
{
/* Pattern of Set s is *(Set_ps1 [s] ... Set_ps2 [s]-1) */
c = Set [s] ;
if (c < EMPTY)
{
/* column ccol of C, skip first entry (j) */
ccol = FLIP (c) ;
pp1 = Cp [ccol] ;
pp2 = (packed) ? (Cp [ccol+1]) : (pp1 + Cnz [ccol]) ;
ASSERT (pp2 - pp1 > 1) ;
Set_ps1 [s] = &(Ci [pp1 + 1]) ;
Set_ps2 [s] = &(Ci [pp2]) ;
PRINT1 (("set "ID" is ccol "ID"\n", s, ccol)) ;
}
else
{
/* column c of L, skip first two entries (c and j) */
pp1 = Lp [c] ;
pp2 = pp1 + Lnz [c] ;
ASSERT (Lnz [c] > 2) ;
Set_ps1 [s] = &(Li [pp1 + 2]) ;
Set_ps2 [s] = &(Li [pp2]) ;
PRINT1 (("set "ID" is L "ID"\n", s, c)) ;
}
DEBUG (dump_set (s, Set_ps1, Set_ps2, j, n, Common)) ;
}
/* -------------------------------------------------------------- */
/* multiset merge */
/* -------------------------------------------------------------- */
/* Merge the sets into a single sorted set, Lj'. Before the merge
* starts, column j is located in Li/Lx [p1 ... p2-1] and the
* space Li/Lx [p2 ... p3-1] is empty. p1 is Lp [j], p2 is
* Lp [j] + Lnz [j] (the old length of the column), and p3 is
* Lp [j] + newlnz (the new and longer length of the column).
*
* The sets 0 to nsets-1 are defined by the Set_ps1 and Set_ps2
* pointers. Set s is located in *(Set_ps1 [s] ... Set_ps2 [s]-1).
* It may be a column of C, or a column of L. All row indices i in
* the sets are in the range i > j and i < n. All sets are sorted.
*
* The merge into column j of L is done in place.
*
* During the merge, p2 and p3 are updated. Li/Lx [p1..p2-1]
* reflects the indices of the old column j of L that are yet to
* be merged into the new column. Entries in their proper place in
* the new column j of L are located in Li/Lx [p3 ... p1+newlnz-1].
* The merge finishes when p2 == p3.
*
* During the merge, set s consumed as it is merged into column j of
* L. Its unconsumed contents are *(Set_ps1 [s] ... Set_ps2 [s]-1).
* When a set is completely consumed, it is removed from the set of
* sets, and nsets is decremented.
*
* The multiset merge and 2-set merge finishes when p2 == p3.
*/
PRINT1 (("Multiset merge p3 "ID" p2 "ID" nsets "ID"\n",
p3, p2, nsets)) ;
while (p3 > p2 && nsets > 1)
{
#ifndef NDEBUG
PRINT2 (("\nMultiset merge. nsets = "ID"\n", nsets)) ;
PRINT2 (("Source col p1 = "ID", p2 = "ID", p3= "ID"\n",
p1, p2, p3)) ;
for (p = p1 + 1 ; p < p2 ; p++)
{
PRINT2 ((" p: "ID" source row "ID" %g\n",
p, Li[p], Lx[p])) ;
ASSERT (Li [p] > j && Li [p] < n) ;
}
PRINT2 (("---\n")) ;
for (p = p3 ; p < p1 + newlnz ; p++)
{
PRINT2 ((" p: "ID" target row "ID" %g\n",
p, Li[p], Lx[p])) ;
ASSERT (Li [p] > j && Li [p] < n) ;
}
for (s = 0 ; s < nsets ; s++)
{
dump_set (s, Set_ps1, Set_ps2, j, n, Common) ;
}
#endif
/* get the entry at the tail end of source column Lj */
row1 = Li [p2 - 1] ;
ASSERT (row1 >= j && p2 >= p1) ;
/* find the largest row in all the sets */
maxrow = row1 ;
smax = EMPTY ;
for (s = nsets-1 ; s >= 0 ; s--)
{
ASSERT (Set_ps1 [s] < Set_ps2 [s]) ;
row = *(Set_ps2 [s] - 1) ;
if (row == maxrow)
{
/* skip past this entry in set s (it is a duplicate) */
Set_ps2 [s]-- ;
if (Set_ps1 [s] == Set_ps2 [s])
{
/* nothing more in this set */
nsets-- ;
Set_ps1 [s] = Set_ps1 [nsets] ;
Set_ps2 [s] = Set_ps2 [nsets] ;
if (smax == nsets)
{
/* Set smax redefined; it is now this set */
smax = s ;
}
}
}
else if (row > maxrow)
{
maxrow = row ;
smax = s ;
}
}
ASSERT (maxrow > j) ;
/* move the row onto the stack of the target column */
if (maxrow == row1)
{
/* next entry is in Lj, move to the bottom of Lj' */
ASSERT (smax == EMPTY) ;
p2-- ;
p3-- ;
Li [p3] = maxrow ;
Lx [p3] = Lx [p2] ;
}
else
{
/* new entry in Lj' */
ASSERT (smax >= 0 && smax < nsets) ;
Set_ps2 [smax]-- ;
p3-- ;
Li [p3] = maxrow ;
Lx [p3] = 0.0 ;
if (Set_ps1 [smax] == Set_ps2 [smax])
{
/* nothing more in this set */
nsets-- ;
Set_ps1 [smax] = Set_ps1 [nsets] ;
Set_ps2 [smax] = Set_ps2 [nsets] ;
PRINT1 (("Set "ID" now empty\n", smax)) ;
}
}
}
/* -------------------------------------------------------------- */
/* 2-set merge: */
/* -------------------------------------------------------------- */
/* This the same as the multi-set merge, except there is only one
* set s = 0 left. The source column j and the set 0 are being
* merged into the target column j. */
if (nsets > 0)
{
ps1 = Set_ps1 [0] ;
ps2 = Set_ps2 [0] ;
}
while (p3 > p2)
{
#ifndef NDEBUG
PRINT2 (("\n2-set merge.\n")) ;
ASSERT (nsets == 1) ;
PRINT2 (("Source col p1 = "ID", p2 = "ID", p3= "ID"\n",
p1, p2, p3)) ;
for (p = p1 + 1 ; p < p2 ; p++)
{
PRINT2 ((" p: "ID" source row "ID" %g\n",
p, Li[p], Lx[p])) ;
ASSERT (Li [p] > j && Li [p] < n) ;
}
PRINT2 (("---\n")) ;
for (p = p3 ; p < p1 + newlnz ; p++)
{
PRINT2 ((" p: "ID" target row "ID" %g\n",
p, Li[p], Lx[p])) ;
ASSERT (Li [p] > j && Li [p] < n) ;
}
dump_set (0, Set_ps1, Set_ps2, j, n, Common) ;
#endif
if (p2 == p1 + 1)
{
/* the top of Lj is empty; copy the set and quit */
while (p3 > p2)
{
/* new entry in Lj' */
row = *(--ps2) ;
p3-- ;
Li [p3] = row ;
Lx [p3] = 0.0 ;
}
}
else
{
/* get the entry at the tail end of Lj */
row1 = Li [p2 - 1] ;
ASSERT (row1 > j && row1 < n) ;
/* get the entry at the tail end of the incoming set */
ASSERT (ps1 < ps2) ;
row = *(ps2-1) ;
ASSERT (row > j && row1 < n) ;
/* move the larger of the two entries to the target set */
if (row1 >= row)
{
/* next entry is in Lj, move to the bottom */
if (row1 == row)
{
/* skip past this entry in the set */
ps2-- ;
}
p2-- ;
p3-- ;
Li [p3] = row1 ;
Lx [p3] = Lx [p2] ;
}
else
{
/* new entry in Lj' */
ps2-- ;
p3-- ;
Li [p3] = row ;
Lx [p3] = 0.0 ;
}
}
}
/* -------------------------------------------------------------- */
/* The new column j of L is now in Li/Lx [p1 ... p2-1] */
/* -------------------------------------------------------------- */
p2 = p1 + newlnz ;
DEBUG (dump_col ("After merge: ", j, p1, p2, Li, Lx, n, Common)) ;
fl += Path [path].rank * (6 + 4 * (double) newlnz) ;
/* -------------------------------------------------------------- */
/* clear Flag; original pattern of column j L no longer marked */
/* -------------------------------------------------------------- */
mark = CHOLMOD(clear_flag) (Common) ;
scattered = FALSE ;
/* -------------------------------------------------------------- */
/* find the new parent */
/* -------------------------------------------------------------- */
newparent = (newlnz > 1) ? (Li [p1 + 1]) : EMPTY ;
PRINT1 (("\nNew parent, Lnz: "ID": "ID" "ID"\n",
j, newparent,newlnz));
ASSERT (oldparent == EMPTY || newparent <= oldparent) ;
/* -------------------------------------------------------------- */
/* go to the next node in the path */
/* -------------------------------------------------------------- */
/* path moves to (j,nextj) unless j is a root */
nextj = (newparent == EMPTY) ? n : newparent ;
/* place path at head of list for nextj, or terminate the path */
PRINT1 (("\n j = "ID" nextj = "ID"\n\n", j, nextj)) ;
Path [path].c = j ;
if (nextj < n)
{
/* put path on link list of pending paths at column nextj */
Path [path].next = Head [nextj] ;
Path [path].pending = nextj ;
Head [nextj] = path ;
PRINT1 (("Path "ID" continues to ("ID","ID"). Rank "ID"\n",
path, Path [path].c, nextj, Path [path].rank)) ;
}
else
{
/* path has ended here, at a root */
Path [path].next = EMPTY ;
Path [path].pending = EMPTY ;
Path [path].end = j ;
PRINT1 (("Path "ID" ends at root ("ID"). Rank "ID"\n",
path, Path [path].end, Path [path].rank)) ;
}
/* The link list Head [j] can now be emptied. Set Head [j] to 1
* if column j has changed (it is no longer used as a link list). */
PRINT1 (("column "ID", oldlnz = "ID"\n", j, Lnz [j])) ;
Head [j] = (Lnz [j] != newlnz) ? 1 : EMPTY ;
Lnz [j] = newlnz ;
PRINT1 (("column "ID", newlnz = "ID"\n", j, newlnz)) ;
DEBUG (dump_col ("New", j, p1, p2, Li, Lx, n, Common)) ;
/* move to the next column */
if (k == Path [path].rank)
{
/* only one path left */
j = nextj ;
}
else
{
/* The current path is moving from column j to column nextj
* (nextj is n if the path has ended). However, there may be
* other paths pending in columns j+1 to nextj-1. There are
* two methods for looking for the next column with a pending
* update. The first one looks at all columns j+1 to nextj-1
* for a non-empty link list. This can be costly if j and
* nextj differ by a large amount (it can be O(n), but this
* entire routine may take Omega(1) time). The second method
* looks at all paths and finds the smallest column at which any
* path is pending. It takes O(# of paths), which is bounded
* by 23: one for each column of C (up to 8), and then 15 for a
* balanced binary tree with 8 leaves. However, if j and
* nextj differ by a tiny amount (nextj is often j+1 near
* the end of the matrix), looking at columns j+1 to nextj
* would be faster. Both methods give the same answer. */
if (nextj - j < npaths)
{
/* there are fewer columns to search than paths */
PRINT1 (("check j="ID" to nextj="ID"\n", j, nextj)) ;
for (j2 = j + 1 ; j2 < nextj ; j2++)
{
PRINT1 (("check j="ID" "ID"\n", j2, Head [j2])) ;
if (Head [j2] != EMPTY)
{
PRINT1 (("found, j="ID"\n", j2)) ;
ASSERT (Path [Head [j2]].pending == j2) ;
break ;
}
}
}
else
{
/* there are fewer paths than columns to search */
j2 = nextj ;
for (kk = 0 ; kk < npaths ; kk++)
{
jj = Path [kk].pending ;
PRINT2 (("Path "ID" pending at "ID"\n", kk, jj)) ;
if (jj != EMPTY) j2 = MIN (j2, jj) ;
}
}
j = j2 ;
}
}
/* ensure workspaces are back to the values required on input */
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, TRUE, Common)) ;
/* ------------------------------------------------------------------ */
/* depth-first-search of tree to order the paths */
/* ------------------------------------------------------------------ */
/* create lists of child paths */
PRINT1 (("\n\nDFS search:\n\n")) ;
for (path = 0 ; path < npaths ; path++)
{
Path [path].c = EMPTY ; /* first child of path */
Path [path].next = EMPTY ; /* next sibling of path */
Path [path].order = EMPTY ; /* path is not ordered yet */
Path [path].wfirst = EMPTY ; /* 1st column of W not found yet */
#ifndef NDEBUG
j = Path [path].start ;
PRINT1 (("Path "ID" : start "ID" end "ID" parent "ID" ccol "ID"\n",
path, j, Path [path].end, Path [path].parent, Path [path].ccol)) ;
for ( ; ; )
{
PRINT1 ((" column "ID"\n", j)) ;
ASSERT (j == EMPTY || (j >= 0 && j < n)) ;
if (j == Path [path].end)
{
break ;
}
ASSERT (j >= 0 && j < n) ;
j = (Lnz [j] > 1) ? (Li [Lp [j] + 1]) : EMPTY ;
}
#endif
}
for (path = 0 ; path < npaths ; path++)
{
p = Path [path].parent ; /* add path to child list of parent */
if (p != EMPTY)
{
ASSERT (p < npaths) ;
Path [path].next = Path [p].c ;
Path [p].c = path ;
}
}
path_order = k ;
w_order = 0 ;
for (path = npaths-1 ; path >= 0 ; path--)
{
if (Path [path].order == EMPTY)
{
/* this path is the root of a subtree of Tbar */
PRINT1 (("Root path "ID"\n", path)) ;
ASSERT (path >= k) ;
dfs (Path, k, path, &path_order, &w_order, 0, npaths) ;
}
}
ASSERT (path_order == npaths) ;
ASSERT (w_order == k) ;
/* reorder the paths */
for (path = 0 ; path < npaths ; path++)
{
/* old order is path, new order is Path [path].order */
OrderedPath [Path [path].order] = Path [path] ;
}
#ifndef NDEBUG
for (path = 0 ; path < npaths ; path++)
{
PRINT1 (("Ordered Path "ID": start "ID" end "ID" wfirst "ID" rank "
""ID" ccol "ID"\n", path, OrderedPath [path].start,
OrderedPath [path].end, OrderedPath [path].wfirst,
OrderedPath [path].rank, OrderedPath [path].ccol)) ;
if (path < k)
{
ASSERT (OrderedPath [path].ccol >= 0) ;
}
else
{
ASSERT (OrderedPath [path].ccol == EMPTY) ;
}
}
#endif
/* ------------------------------------------------------------------ */
/* numeric update/downdate for all paths */
/* ------------------------------------------------------------------ */
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, wdim, Common)) ;
switch (wdim)
{
case 1:
updown_1_r (update, C, k, L, W, OrderedPath, npaths, Common) ;
break ;
case 2:
updown_2_r (update, C, k, L, W, OrderedPath, npaths, Common) ;
break ;
case 4:
updown_4_r (update, C, k, L, W, OrderedPath, npaths, Common) ;
break ;
case 8:
updown_8_r (update, C, k, L, W, OrderedPath, npaths, Common) ;
break ;
}
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, wdim, Common)) ;
}
/* ---------------------------------------------------------------------- */
/* update/downdate the forward solve */
/* ---------------------------------------------------------------------- */
if (do_solve)
{
/* We now have DeltaB += Lold (:,j) * X (j) for all columns j in union
* of all paths seen during the entire rank-cncol update/downdate. For
* each j in path, do DeltaB -= Lnew (:,j)*DeltaB(j)
* in topological order. */
#ifndef NDEBUG
PRINT1 (("\ndo_solve, DeltaB + Lold(:,Path)*X(Path):\n")) ;
for (i = 0 ; i < n ; i++)
{
PRINT1 (("do_solve: "ID" %30.20e\n", i, Nx [i])) ;
}
#endif
/* Note that the downdate, if it deleted entries, would need to compute
* the Stack prior to doing any downdates. */
/* find the union of all the paths in the new L */
top = n ; /* "top" is stack pointer, not a row or column index */
for (ccol = 0 ; ccol < cncol ; ccol++)
{
/* -------------------------------------------------------------- */
/* j = first row index of C (:,ccol) */
/* -------------------------------------------------------------- */
pp1 = Cp [ccol] ;
pp2 = (packed) ? (Cp [ccol+1]) : (pp1 + Cnz [ccol]) ;
if (pp2 > pp1)
{
/* Column ccol of C has at least one entry. */
j = Ci [pp1] ;
}
else
{
/* Column ccol of C is empty */
j = n-1 ;
}
PRINT1 (("\ndo_solve: ccol= "ID"\n", ccol)) ;
ASSERT (j >= 0 && j < n) ;
len = 0 ;
/* -------------------------------------------------------------- */
/* find the new rowmark */
/* -------------------------------------------------------------- */
/* Each column of C can redefine the region of L that takes part in
* the update/downdate of the triangular solve Lx=b. If
* i = colmark [ccol] for column C(:,ccol), then i = rowmark [j] is
* redefined for all columns along the path modified by C(:,ccol).
* If more than one column modifies any given column j of L, then
* the rowmark of j is determined by the colmark of the least-
* numbered column that affects column j. That is, if both
* C(:,ccol1) and C(:,ccol2) affect column j of L, then
* rowmark [j] = colmark [MIN (ccol1, ccol2)].
*
* rowmark [j] is not modified if rowmark or colmark are NULL,
* or if colmark [ccol] is EMPTY.
*/
botrow = (use_colmark && use_rowmark) ? (colmark [ccol]) : EMPTY ;
/* -------------------------------------------------------------- */
/* traverse from j towards root, stopping if node already visited */
/* -------------------------------------------------------------- */
while (j != EMPTY && Flag [j] < mark)
{
PRINT1 (("do_solve: subpath j= "ID"\n", j)) ;
ASSERT (j >= 0 && j < n) ;
Stack [len++] = j ; /* place j on the stack */
Flag [j] = mark ; /* flag j as visited */
/* redefine the parts of column j of L that take part in
* the triangular solve. */
if (botrow != EMPTY)
{
/* update rowmark to keep track of botrow for col j */
rowmark [j] = botrow ;
}
/* go up the tree, to the parent of j */
j = (Lnz [j] > 1) ? (Li [Lp [j] + 1]) : EMPTY ;
}
/* -------------------------------------------------------------- */
/* move the path down to the bottom of the stack */
/* -------------------------------------------------------------- */
ASSERT (len <= top) ;
while (len > 0)
{
Stack [--top] = Stack [--len] ;
}
}
#ifndef NDEBUG
/* Union of paths now in Stack [top..n-1] in topological order */
PRINT1 (("\nTopological order:\n")) ;
for (i = top ; i < n ; i++)
{
PRINT1 (("column "ID" in full path\n", Stack [i])) ;
}
#endif
/* Do the forward solve for the full path part of L */
for (m = top ; m < n ; m++)
{
j = Stack [m] ;
ASSERT (j >= 0 && j < n) ;
PRINT1 (("do_solve: path j= "ID"\n", j)) ;
p1 = Lp [j] ;
lnz = Lnz [j] ;
p2 = p1 + lnz ;
xj = Nx [j] ;
/* copy new solution onto old one, for all cols in full path */
Xx [j] = xj ;
Nx [j] = 0. ;
/* DeltaB -= Lnew (j+1:botrow-1,j) * deltab(j) */
botrow = (use_rowmark) ? (rowmark [j]) : n ;
for (p = p1 + 1 ; p < p2 ; p++)
{
i = Li [p] ;
if (i >= botrow)
{
break ;
}
Nx [i] -= Lx [p] * xj ;
}
}
/* clear the Flag */
mark = CHOLMOD(clear_flag) (Common) ;
}
/* ---------------------------------------------------------------------- */
/* successful update/downdate */
/* ---------------------------------------------------------------------- */
Common->modfl = fl ;
DEBUG (for (j = 0 ; j < n ; j++) ASSERT (IMPLIES (do_solve, Nx[j] == 0.))) ;
ASSERT (CHOLMOD(dump_work) (TRUE, TRUE, TRUE, Common)) ;
DEBUG (CHOLMOD(dump_factor) (L, "output L for updown", Common)) ;
return (TRUE) ;
}
/* Just poll without blocking */
static int select_poll(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds)
{
int i, n = 0;
#ifdef HAVE_LWIP
int sock_n = 0, sock_nfds = 0;
fd_set sock_readfds, sock_writefds, sock_exceptfds;
struct timeval timeout = { .tv_sec = 0, .tv_usec = 0};
#endif
#ifdef LIBC_VERBOSE
static int nb;
static int nbread[NOFILE], nbwrite[NOFILE], nbexcept[NOFILE];
static s_time_t lastshown;
nb++;
#endif
#ifdef HAVE_LWIP
/* first poll network */
FD_ZERO(&sock_readfds);
FD_ZERO(&sock_writefds);
FD_ZERO(&sock_exceptfds);
for (i = 0; i < nfds; i++) {
if (files[i].type == FTYPE_SOCKET) {
if (FD_ISSET(i, readfds)) {
FD_SET(files[i].socket.fd, &sock_readfds);
sock_nfds = i+1;
}
if (FD_ISSET(i, writefds)) {
FD_SET(files[i].socket.fd, &sock_writefds);
sock_nfds = i+1;
}
if (FD_ISSET(i, exceptfds)) {
FD_SET(files[i].socket.fd, &sock_exceptfds);
sock_nfds = i+1;
}
}
}
if (sock_nfds > 0) {
DEBUG("lwip_select(");
dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
DEBUG("); -> ");
sock_n = lwip_select(sock_nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
DEBUG("\n");
}
#endif
/* Then see others as well. */
for (i = 0; i < nfds; i++) {
switch(files[i].type) {
default:
if (FD_ISSET(i, readfds) || FD_ISSET(i, writefds) || FD_ISSET(i, exceptfds))
printk("bogus fd %d in select\n", i);
/* Fallthrough. */
case FTYPE_CONSOLE:
if (FD_ISSET(i, readfds)) {
if (xencons_ring_avail(files[i].cons.dev))
n++;
else
FD_CLR(i, readfds);
}
if (FD_ISSET(i, writefds))
n++;
FD_CLR(i, exceptfds);
break;
#ifdef CONFIG_XENBUS
case FTYPE_XENBUS:
if (FD_ISSET(i, readfds)) {
if (files[i].xenbus.events)
n++;
else
FD_CLR(i, readfds);
}
FD_CLR(i, writefds);
FD_CLR(i, exceptfds);
break;
#endif
case FTYPE_EVTCHN:
case FTYPE_TAP:
case FTYPE_BLK:
case FTYPE_KBD:
case FTYPE_FB:
if (FD_ISSET(i, readfds)) {
if (files[i].read)
n++;
else
FD_CLR(i, readfds);
}
FD_CLR(i, writefds);
FD_CLR(i, exceptfds);
break;
#ifdef HAVE_LWIP
case FTYPE_SOCKET:
if (FD_ISSET(i, readfds)) {
/* Optimize no-network-packet case. */
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_readfds))
n++;
else
FD_CLR(i, readfds);
}
if (FD_ISSET(i, writefds)) {
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_writefds))
n++;
else
FD_CLR(i, writefds);
}
if (FD_ISSET(i, exceptfds)) {
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_exceptfds))
n++;
else
FD_CLR(i, exceptfds);
}
break;
#endif
}
#ifdef LIBC_VERBOSE
if (FD_ISSET(i, readfds))
nbread[i]++;
if (FD_ISSET(i, writefds))
nbwrite[i]++;
if (FD_ISSET(i, exceptfds))
nbexcept[i]++;
#endif
}
#ifdef LIBC_VERBOSE
if (NOW() > lastshown + 1000000000ull) {
lastshown = NOW();
printk("%lu MB free, ", num_free_pages() / ((1 << 20) / PAGE_SIZE));
printk("%d(%d): ", nb, sock_n);
for (i = 0; i < nfds; i++) {
if (nbread[i] || nbwrite[i] || nbexcept[i])
printk(" %d(%c):", i, file_types[files[i].type]);
if (nbread[i])
printk(" %dR", nbread[i]);
if (nbwrite[i])
printk(" %dW", nbwrite[i]);
if (nbexcept[i])
printk(" %dE", nbexcept[i]);
}
printk("\n");
memset(nbread, 0, sizeof(nbread));
memset(nbwrite, 0, sizeof(nbwrite));
memset(nbexcept, 0, sizeof(nbexcept));
nb = 0;
}
#endif
return n;
}
/* The strategy is to
* - announce that we will maybe sleep
* - poll a bit ; if successful, return
* - if timeout, return
* - really sleep (except if somebody woke us in the meanwhile) */
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
int n, ret;
fd_set myread, mywrite, myexcept;
struct thread *thread = get_current();
s_time_t start = NOW(), stop;
#ifdef CONFIG_NETFRONT
DEFINE_WAIT(netfront_w);
#endif
DEFINE_WAIT(event_w);
#ifdef CONFIG_BLKFRONT
DEFINE_WAIT(blkfront_w);
#endif
#ifdef CONFIG_XENBUS
DEFINE_WAIT(xenbus_watch_w);
#endif
#ifdef CONFIG_KBDFRONT
DEFINE_WAIT(kbdfront_w);
#endif
DEFINE_WAIT(console_w);
assert(thread == main_thread);
DEBUG("select(%d, ", nfds);
dump_set(nfds, readfds, writefds, exceptfds, timeout);
DEBUG(");\n");
if (timeout)
stop = start + SECONDS(timeout->tv_sec) + timeout->tv_usec * 1000;
else
/* just make gcc happy */
stop = start;
/* Tell people we're going to sleep before looking at what they are
* saying, hence letting them wake us if events happen between here and
* schedule() */
#ifdef CONFIG_NETFRONT
add_waiter(netfront_w, netfront_queue);
#endif
add_waiter(event_w, event_queue);
#ifdef CONFIG_BLKFRONT
add_waiter(blkfront_w, blkfront_queue);
#endif
#ifdef CONFIG_XENBUS
add_waiter(xenbus_watch_w, xenbus_watch_queue);
#endif
#ifdef CONFIG_KBDFRONT
add_waiter(kbdfront_w, kbdfront_queue);
#endif
add_waiter(console_w, console_queue);
if (readfds)
myread = *readfds;
else
FD_ZERO(&myread);
if (writefds)
mywrite = *writefds;
else
FD_ZERO(&mywrite);
if (exceptfds)
myexcept = *exceptfds;
else
FD_ZERO(&myexcept);
DEBUG("polling ");
dump_set(nfds, &myread, &mywrite, &myexcept, timeout);
DEBUG("\n");
n = select_poll(nfds, &myread, &mywrite, &myexcept);
if (n) {
dump_set(nfds, readfds, writefds, exceptfds, timeout);
if (readfds)
*readfds = myread;
if (writefds)
*writefds = mywrite;
if (exceptfds)
*exceptfds = myexcept;
DEBUG(" -> ");
dump_set(nfds, readfds, writefds, exceptfds, timeout);
DEBUG("\n");
wake(thread);
ret = n;
goto out;
}
if (timeout && NOW() >= stop) {
if (readfds)
FD_ZERO(readfds);
if (writefds)
FD_ZERO(writefds);
if (exceptfds)
FD_ZERO(exceptfds);
timeout->tv_sec = 0;
timeout->tv_usec = 0;
wake(thread);
ret = 0;
goto out;
}
if (timeout)
thread->wakeup_time = stop;
schedule();
if (readfds)
myread = *readfds;
else
FD_ZERO(&myread);
if (writefds)
mywrite = *writefds;
else
FD_ZERO(&mywrite);
if (exceptfds)
myexcept = *exceptfds;
else
FD_ZERO(&myexcept);
n = select_poll(nfds, &myread, &mywrite, &myexcept);
if (n) {
if (readfds)
*readfds = myread;
if (writefds)
*writefds = mywrite;
if (exceptfds)
*exceptfds = myexcept;
ret = n;
goto out;
}
errno = EINTR;
ret = -1;
out:
#ifdef CONFIG_NETFRONT
remove_waiter(netfront_w, netfront_queue);
#endif
remove_waiter(event_w, event_queue);
#ifdef CONFIG_BLKFRONT
remove_waiter(blkfront_w, blkfront_queue);
#endif
#ifdef CONFIG_XENBUS
remove_waiter(xenbus_watch_w, xenbus_watch_queue);
#endif
#ifdef CONFIG_KBDFRONT
remove_waiter(kbdfront_w, kbdfront_queue);
#endif
remove_waiter(console_w, console_queue);
return ret;
}
/* The strategy is to
* - announce that we will maybe sleep
* - poll a bit ; if successful, return
* - if timeout, return
* - really sleep (except if somebody woke us in the meanwhile) */
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
int n, ret;
fd_set myread, mywrite, myexcept;
struct thread *thread = get_current();
s_time_t start = NOW(), stop;
DEFINE_WAIT(w1);
DEFINE_WAIT(w2);
DEFINE_WAIT(w3);
DEFINE_WAIT(w4);
DEFINE_WAIT(w5);
DEFINE_WAIT(w6);
int n_sockets;
int n_non_sockets;
assert(thread == main_thread);
n_sockets = 0;
n_non_sockets = 0;
for (n = 0; n <= nfds; n++) {
if ((readfds && FD_ISSET(n, readfds)) ||
(writefds && FD_ISSET(n, writefds)) ||
(exceptfds && FD_ISSET(n, exceptfds))) {
if (files[n].type == FTYPE_SOCKET)
n_sockets++;
else
n_non_sockets++;
}
}
if (n_sockets != 0 && n_non_sockets != 0) {
static int cntr;
if (cntr < 1000) {
printk("WARNING: select combining socket and non-socket FDs (n = %d vs %d); warning %d/1000\n",
n_sockets, n_non_sockets, cntr);
cntr++;
}
}
if (n_non_sockets == 0)
return do_lwip_select(nfds, readfds, writefds, exceptfds, timeout);
if (timeout)
stop = start + SECONDS(timeout->tv_sec) + timeout->tv_usec * 1000;
else
/* just make gcc happy */
stop = start;
/* Tell people we're going to sleep before looking at what they are
* saying, hence letting them wake us if events happen between here and
* schedule() */
add_waiter(w1, netfront_queue);
add_waiter(w2, event_queue);
add_waiter(w3, blkfront_queue);
add_waiter(w4, xenbus_watch_queue);
add_waiter(w5, kbdfront_queue);
add_waiter(w6, console_queue);
if (readfds)
myread = *readfds;
else
FD_ZERO(&myread);
if (writefds)
mywrite = *writefds;
else
FD_ZERO(&mywrite);
if (exceptfds)
myexcept = *exceptfds;
else
FD_ZERO(&myexcept);
DEBUG("polling ");
dump_set(nfds, &myread, &mywrite, &myexcept, timeout);
DEBUG("\n");
n = select_poll(nfds, &myread, &mywrite, &myexcept);
if (n) {
dump_set(nfds, readfds, writefds, exceptfds, timeout);
if (readfds)
*readfds = myread;
if (writefds)
*writefds = mywrite;
if (exceptfds)
*exceptfds = myexcept;
DEBUG(" -> ");
dump_set(nfds, readfds, writefds, exceptfds, timeout);
DEBUG("\n");
wake(thread);
ret = n;
goto out;
}
if (timeout && NOW() >= stop) {
if (readfds)
FD_ZERO(readfds);
if (writefds)
FD_ZERO(writefds);
if (exceptfds)
FD_ZERO(exceptfds);
timeout->tv_sec = 0;
timeout->tv_usec = 0;
wake(thread);
ret = 0;
goto out;
}
if (timeout)
thread->wakeup_time = stop;
schedule();
if (readfds)
myread = *readfds;
else
FD_ZERO(&myread);
if (writefds)
mywrite = *writefds;
else
FD_ZERO(&mywrite);
if (exceptfds)
myexcept = *exceptfds;
else
FD_ZERO(&myexcept);
n = select_poll(nfds, &myread, &mywrite, &myexcept);
if (n) {
if (readfds)
*readfds = myread;
if (writefds)
*writefds = mywrite;
if (exceptfds)
*exceptfds = myexcept;
ret = n;
goto out;
}
errno = EINTR;
ret = -1;
out:
remove_waiter(w1);
remove_waiter(w2);
remove_waiter(w3);
remove_waiter(w4);
remove_waiter(w5);
remove_waiter(w6);
return ret;
}
/* Just poll without blocking */
static int select_poll(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds)
{
int i, n = 0;
#ifdef HAVE_LWIP
int sock_n = 0, sock_nfds = 0;
fd_set sock_readfds, sock_writefds, sock_exceptfds;
struct timeval timeout = { .tv_sec = 0, .tv_usec = 0};
#endif
#ifdef LIBC_VERBOSE
static int nb;
static int nbread[NOFILE], nbwrite[NOFILE], nbexcept[NOFILE];
static s_time_t lastshown;
nb++;
#endif
#ifdef HAVE_LWIP
/* first poll network */
FD_ZERO(&sock_readfds);
FD_ZERO(&sock_writefds);
FD_ZERO(&sock_exceptfds);
for (i = 0; i < nfds; i++) {
if (files[i].type == FTYPE_SOCKET) {
if (FD_ISSET(i, readfds)) {
FD_SET(files[i].socket.fd, &sock_readfds);
sock_nfds = i+1;
}
if (FD_ISSET(i, writefds)) {
FD_SET(files[i].socket.fd, &sock_writefds);
sock_nfds = i+1;
}
if (FD_ISSET(i, exceptfds)) {
FD_SET(files[i].socket.fd, &sock_exceptfds);
sock_nfds = i+1;
}
}
}
if (sock_nfds > 0) {
DEBUG("lwip_select(");
dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
DEBUG("); -> ");
sock_n = lwip_select(sock_nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
dump_set(nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, &timeout);
DEBUG("\n");
}
#endif
/* Then see others as well. */
for (i = 0; i < nfds; i++) {
switch(files[i].type) {
default:
if (FD_ISSET(i, readfds) || FD_ISSET(i, writefds) || FD_ISSET(i, exceptfds))
printk("bogus fd %d in select\n", i);
/* Fallthrough. */
case FTYPE_CONSOLE:
if (FD_ISSET(i, readfds)) {
if (xencons_ring_avail(files[i].cons.dev))
n++;
else
FD_CLR(i, readfds);
}
if (FD_ISSET(i, writefds))
n++;
FD_CLR(i, exceptfds);
break;
case FTYPE_XENBUS:
if (FD_ISSET(i, readfds)) {
if (files[i].xenbus.events)
n++;
else
FD_CLR(i, readfds);
}
FD_CLR(i, writefds);
FD_CLR(i, exceptfds);
break;
case FTYPE_EVTCHN:
case FTYPE_TAP:
case FTYPE_BLK:
case FTYPE_KBD:
case FTYPE_FB:
if (FD_ISSET(i, readfds)) {
if (files[i].read)
n++;
else
FD_CLR(i, readfds);
}
FD_CLR(i, writefds);
FD_CLR(i, exceptfds);
break;
#ifdef HAVE_LWIP
case FTYPE_SOCKET:
if (FD_ISSET(i, readfds)) {
/* Optimize no-network-packet case. */
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_readfds))
n++;
else
FD_CLR(i, readfds);
}
if (FD_ISSET(i, writefds)) {
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_writefds))
n++;
else
FD_CLR(i, writefds);
}
if (FD_ISSET(i, exceptfds)) {
if (sock_n && FD_ISSET(files[i].socket.fd, &sock_exceptfds))
n++;
else
FD_CLR(i, exceptfds);
}
break;
#endif
}
#ifdef LIBC_VERBOSE
if (FD_ISSET(i, readfds))
nbread[i]++;
if (FD_ISSET(i, writefds))
nbwrite[i]++;
if (FD_ISSET(i, exceptfds))
nbexcept[i]++;
#endif
}
#ifdef LIBC_VERBOSE
if (NOW() > lastshown + 1000000000ull) {
lastshown = NOW();
printk("%lu MB free, ", num_free_pages() / ((1 << 20) / PAGE_SIZE));
printk("%d(%d): ", nb, sock_n);
for (i = 0; i < nfds; i++) {
if (nbread[i] || nbwrite[i] || nbexcept[i])
printk(" %d(%c):", i, file_types[files[i].type]);
if (nbread[i])
printk(" %dR", nbread[i]);
if (nbwrite[i])
printk(" %dW", nbwrite[i]);
if (nbexcept[i])
printk(" %dE", nbexcept[i]);
}
printk("\n");
memset(nbread, 0, sizeof(nbread));
memset(nbwrite, 0, sizeof(nbwrite));
memset(nbexcept, 0, sizeof(nbexcept));
nb = 0;
}
#endif
return n;
}
static int do_lwip_select(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *tv)
{
fd_set sock_readfds, sock_writefds, sock_exceptfds;
int sock_nfds;
int i;
int r;
FD_ZERO(&sock_readfds);
FD_ZERO(&sock_writefds);
FD_ZERO(&sock_exceptfds);
sock_nfds = 0;
for (i = 0; i < nfds; i++) {
if (readfds && FD_ISSET(i, readfds)) {
FD_SET(files[i].socket.fd, &sock_readfds);
sock_nfds = i+1;
}
if (writefds && FD_ISSET(i, writefds)) {
FD_SET(files[i].socket.fd, &sock_writefds);
sock_nfds = i+1;
}
if (exceptfds && FD_ISSET(i, exceptfds)) {
FD_SET(files[i].socket.fd, &sock_exceptfds);
sock_nfds = i+1;
}
}
DEBUG("%s(%d, ", __func__, nfds);
dump_set(nfds, readfds, writefds, exceptfds, tv);
DEBUG(")\n");
r = lwip_select(sock_nfds, &sock_readfds, &sock_writefds, &sock_exceptfds, tv);
if (r < 0) {
DEBUG("%s -> %d\n", __func__, r);
return r;
}
for (i = 0; i < nfds; i++) {
if (readfds && FD_ISSET(i, readfds) && !FD_ISSET(files[i].socket.fd, &sock_readfds))
FD_CLR(i, readfds);
if (writefds && FD_ISSET(i, writefds) && !FD_ISSET(files[i].socket.fd, &sock_writefds))
FD_CLR(i, writefds);
if (exceptfds && FD_ISSET(i, exceptfds) && !FD_ISSET(files[i].socket.fd, &sock_exceptfds))
FD_CLR(i, exceptfds);
}
DEBUG("%s -> ", __func__, nfds);
dump_set(nfds, readfds, writefds, exceptfds, tv);
DEBUG("\n");
return r;
}