func NewB(m uint) *ImpB {
//
var s cs.CriticalSection
if m < 1 {
m = 1
}
var nR, nW, rR uint
c := func(k uint) bool {
if k == reader {
return nW == 0 && (s.Blocked(writer) || rR < m)
}
return nR == 0 && nW == 0 /* && ! x.s.Blocked (readeer) */ // writer
}
e := func(a Any, k uint) {
if k == reader {
nR++
rR++
} else { // writer
nW++
rR = 0
}
}
l := func(a Any, k uint) {
if k == reader {
nR--
} else { // writer
nW--
}
}
s = cs.New(2, c, e, l)
return &ImpB{s}
}
func NewCS2() *ImpCS2 {
//
var s cs.CriticalSection
var nR, nW uint
c := func(k uint) bool {
if k == reader {
return nW == 0 && !s.Blocked(writer)
}
return nR == 0 && nW == 0 // writer
}
e := func(a Any, k uint) {
if k == reader {
nR++
} else { // writer
nW = 1
}
}
l := func(a Any, k uint) {
if k == reader {
nR--
} else { // writer
nW = 0
}
}
s = cs.New(2, c, e, l)
return &ImpCS2{s}
}
func NewB(l, r uint) *ImpB {
//
if l == 0 {
l = ker.MaxNat
}
if r == 0 {
r = ker.MaxNat
}
var nL, nR, rL, rR, zL, zR uint
var s cs.CriticalSection
c := func(k uint) bool {
if k == left {
return nR == 0 && (!s.Blocked(right) || rL < zL)
}
return nL == 0 && (!s.Blocked(left) || rR < zR) // right
}
e := func(A Any, k uint) {
if k == left {
nL++
rL++
rR = 0
} else { // right
nR++
rR++
rL = 0
}
}
a := func(A Any, k uint) {
if k == left {
nL--
} else { // right
nR--
}
}
zL, zR = l, r
s = cs.New(2, c, e, a)
return &ImpB{s}
}