/
atomicops.pm6
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/
atomicops.pm6
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#== Atomics available on all backends ============================================
#-- fetching a value atomically
proto sub atomic-fetch($, *%) {*}
multi sub atomic-fetch($source is rw) {
nqp::atomicload($source)
}
proto sub prefix:<β>($, *%) {*}
multi sub prefix:<β>($source is rw) {
nqp::atomicload($source)
}
#-- assigning a value atomically
proto sub atomic-assign($, $, *%) {*}
multi sub atomic-assign($target is rw, \value) {
nqp::atomicstore($target, value)
}
#-- atomic compare and swap
proto sub cas($, $, $?, *%) {*}
multi sub cas($target is rw, \expected, \value) {
nqp::cas($target, expected, value)
}
multi sub cas($target is rw, &code) {
my $current := nqp::atomicload($target);
nqp::until(
nqp::stmts(
(my $updated := code($current)),
(my $seen := nqp::cas($target, $current, $updated)),
nqp::eqaddr($seen, $current)
),
$current := $seen
);
$updated
}
#== Native integer atomics only available on MoarVM ==============================
#?if !jvm
my native atomicint is repr('P6int') is Int is ctype('atomic') { }
#-- fetching a native integer value atomically
multi sub atomic-fetch(atomicint $source is rw) {
nqp::atomicload_i($source)
}
multi sub prefix:<β>(atomicint $source is rw) {
nqp::atomicload_i($source)
}
#-- assigning a native integer value atomically
multi sub atomic-assign(atomicint $target is rw, int $value) {
nqp::atomicstore_i($target, $value)
}
multi sub atomic-assign(atomicint $target is rw, Int:D $value) {
nqp::atomicstore_i($target, $value)
}
multi sub atomic-assign(atomicint $target is rw, $value) {
nqp::atomicstore_i($target, $value.Int)
}
proto sub infix:<β=>($, $, *%) {*}
multi sub infix:<β=>($target is rw, \value) {
nqp::atomicstore($target, value)
}
multi sub infix:<β=>(atomicint $target is rw, int $value) {
nqp::atomicstore_i($target, $value)
}
multi sub infix:<β=>(atomicint $target is rw, Int:D $value) {
nqp::atomicstore_i($target, $value)
}
multi sub infix:<β=>(atomicint $target is rw, $value) {
nqp::atomicstore_i($target, $value.Int)
}
#-- atomically fetch native integer value and increment it
proto sub atomic-fetch-inc($, *%) {*}
multi sub atomic-fetch-inc(atomicint $target is rw --> atomicint) {
nqp::atomicinc_i($target)
}
proto sub postfix:<β++>($, *%) {*}
multi sub postfix:<β++>(atomicint $target is rw --> atomicint) {
nqp::atomicinc_i($target)
}
#-- atomically increment native integer value and fetch it
proto sub atomic-inc-fetch($, *%) {*}
multi sub atomic-inc-fetch(atomicint $target is rw --> atomicint) {
my atomicint $ = nqp::atomicinc_i($target) + 1
}
proto sub prefix:<++β>($, *%) {*}
multi sub prefix:<++β>(atomicint $target is rw --> atomicint) {
my atomicint $ = nqp::atomicinc_i($target) + 1
}
#-- atomically fetch native integer value and decrement it
proto sub atomic-fetch-dec($, *%) {*}
multi sub atomic-fetch-dec(atomicint $target is rw --> atomicint) {
nqp::atomicdec_i($target)
}
proto sub postfix:<β-->($, *%) {*}
multi sub postfix:<β-->(atomicint $target is rw --> atomicint) {
nqp::atomicdec_i($target)
}
#-- atomically decrement native integer value and fetch it
proto sub atomic-dec-fetch($, *%) {*}
multi sub atomic-dec-fetch(atomicint $target is rw --> atomicint) {
my atomicint $ = nqp::atomicdec_i($target) - 1
}
proto sub prefix:<--β>($, *%) {*}
multi sub prefix:<--β>(atomicint $target is rw --> atomicint) {
my atomicint $ = nqp::atomicdec_i($target) - 1
}
#-- atomically fetch native integer value and then add given value to it
proto sub atomic-fetch-add($, $, *%) {*}
multi sub atomic-fetch-add(atomicint $target is rw, int $add --> atomicint) {
nqp::atomicadd_i($target, $add)
}
multi sub atomic-fetch-add(atomicint $target is rw, Int:D $add --> atomicint) {
nqp::atomicadd_i($target, $add)
}
multi sub atomic-fetch-add(atomicint $target is rw, $add --> atomicint) {
nqp::atomicadd_i($target, $add.Int)
}
#-- atomically add given native integer value to value and return that
proto sub atomic-add-fetch($, $, *%) {*}
multi sub atomic-add-fetch(atomicint $target is rw, int $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, $add) + $add
}
multi sub atomic-add-fetch(atomicint $target is rw, Int:D $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, $add) + $add
}
multi sub atomic-add-fetch(atomicint $target is rw, $add --> atomicint) {
my int $add-int = $add.Int;
my atomicint $ = nqp::atomicadd_i($target, $add-int) + $add-int
}
proto sub infix:<β+=>($, $, *%) {*}
multi sub infix:<β+=>(atomicint $target is rw, int $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, $add) + $add
}
multi sub infix:<β+=>(atomicint $target is rw, Int:D $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, $add) + $add
}
multi sub infix:<β+=>(atomicint $target is rw, $add --> atomicint) {
my int $add-int = $add.Int;
my atomicint $ = nqp::atomicadd_i($target, $add-int) + $add-int
}
#-- atomically fetch native integer value and then subtract given value from it
proto sub atomic-fetch-sub($, $, *%) {*}
multi sub atomic-fetch-sub(atomicint $target is rw, int $add --> atomicint) {
nqp::atomicadd_i($target, nqp::neg_i($add))
}
multi sub atomic-fetch-sub(atomicint $target is rw, Int:D $add --> atomicint) {
nqp::atomicadd_i($target, nqp::neg_i($add))
}
multi sub atomic-fetch-sub(atomicint $target is rw, $add --> atomicint) {
nqp::atomicadd_i($target, nqp::neg_i($add.Int))
}
#-- atomically subtract given native integer value from value and return that
proto sub atomic-sub-fetch($, $, *%) {*}
multi sub atomic-sub-fetch(atomicint $target is rw, int $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, nqp::neg_i($add)) - $add
}
multi sub atomic-sub-fetch(atomicint $target is rw, Int:D $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, nqp::neg_i($add)) - $add
}
multi sub atomic-sub-fetch(atomicint $target is rw, $add --> atomicint) {
my int $add-int = nqp::neg_i($add.Int);
my atomicint $ = nqp::atomicadd_i($target, $add-int) + $add-int
}
proto sub infix:<β-=>($, $, *%) {*}
multi sub infix:<β-=>(atomicint $target is rw, int $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, nqp::neg_i($add)) - $add
}
multi sub infix:<β-=>(atomicint $target is rw, Int:D $add --> atomicint) {
my atomicint $ = nqp::atomicadd_i($target, nqp::neg_i($add)) - $add
}
multi sub infix:<β-=>(atomicint $target is rw, $add --> atomicint) {
my int $add-int = nqp::neg_i($add.Int);
my atomicint $ = nqp::atomicadd_i($target, $add-int) + $add-int
}
my constant &infix:<ββ=> := &infix:<β-=>;
#-- provide full barrier semantics
proto sub full-barrier(*%) {*}
multi sub full-barrier(--> Nil) {
nqp::barrierfull()
}
#-- atomic compare and swap a native integer
multi sub cas(atomicint $target is rw, int $expected, int $value) {
nqp::cas_i($target, $expected, $value)
}
multi sub cas(atomicint $target is rw, Int:D $expected, Int:D $value) {
nqp::cas_i($target, $expected, $value)
}
multi sub cas(atomicint $target is rw, $expected, $value) {
nqp::cas_i($target, $expected.Int, $value.Int)
}
multi sub cas(atomicint $target is rw, &code) {
my int $current = nqp::atomicload_i($target);
loop {
my int $updated = code($current);
my int $seen = nqp::cas_i($target, $current, $updated);
return $updated if $seen == $current;
$current = $seen;
}
}
#?endif
# vim: expandtab shiftwidth=4