--- /dev/null
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Run the game of life in C using Go for parallelization.
+
+package main
+
+import (
+ "flag"
+ "fmt"
+ "plugin"
+)
+
+const MAXDIM = 100
+
+var dim = flag.Int("dim", 16, "board dimensions")
+var gen = flag.Int("gen", 10, "generations")
+
+func main() {
+ flag.Parse()
+
+ var a [MAXDIM * MAXDIM]int32
+ for i := 2; i < *dim; i += 8 {
+ for j := 2; j < *dim-3; j += 8 {
+ for y := 0; y < 3; y++ {
+ a[i**dim+j+y] = 1
+ }
+ }
+ }
+
+ p, err := plugin.Open("life.so")
+ if err != nil {
+ panic(err)
+ }
+ f, err := p.Lookup("Run")
+ if err != nil {
+ panic(err)
+ }
+ f.(func(int, int, int, []int32))(*gen, *dim, *dim, a[:])
+
+ for i := 0; i < *dim; i++ {
+ for j := 0; j < *dim; j++ {
+ if a[i**dim+j] == 0 {
+ fmt.Print(" ")
+ } else {
+ fmt.Print("X")
+ }
+ }
+ fmt.Print("\n")
+ }
+}
--- /dev/null
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include <assert.h>
+#include "life.h"
+#include "_cgo_export.h"
+
+const int MYCONST = 0;
+
+// Do the actual manipulation of the life board in C. This could be
+// done easily in Go, we are just using C for demonstration
+// purposes.
+void
+Step(int x, int y, int *a, int *n)
+{
+ struct GoStart_return r;
+
+ // Use Go to start 4 goroutines each of which handles 1/4 of the
+ // board.
+ r = GoStart(0, x, y, 0, x / 2, 0, y / 2, a, n);
+ assert(r.r0 == 0 && r.r1 == 100); // test multiple returns
+ r = GoStart(1, x, y, x / 2, x, 0, y / 2, a, n);
+ assert(r.r0 == 1 && r.r1 == 101); // test multiple returns
+ GoStart(2, x, y, 0, x / 2, y / 2, y, a, n);
+ GoStart(3, x, y, x / 2, x, y / 2, y, a, n);
+ GoWait(0);
+ GoWait(1);
+ GoWait(2);
+ GoWait(3);
+}
+
+// The actual computation. This is called in parallel.
+void
+DoStep(int xdim, int ydim, int xstart, int xend, int ystart, int yend, int *a, int *n)
+{
+ int x, y, c, i, j;
+
+ for(x = xstart; x < xend; x++) {
+ for(y = ystart; y < yend; y++) {
+ c = 0;
+ for(i = -1; i <= 1; i++) {
+ for(j = -1; j <= 1; j++) {
+ if(x+i >= 0 && x+i < xdim &&
+ y+j >= 0 && y+j < ydim &&
+ (i != 0 || j != 0))
+ c += a[(x+i)*xdim + (y+j)] != 0;
+ }
+ }
+ if(c == 3 || (c == 2 && a[x*xdim + y] != 0))
+ n[x*xdim + y] = 1;
+ else
+ n[x*xdim + y] = 0;
+ }
+ }
+}
--- /dev/null
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// #include "life.h"
+import "C"
+
+import "unsafe"
+
+func Run(gen, x, y int, a []int32) {
+ n := make([]int32, x*y)
+ for i := 0; i < gen; i++ {
+ C.Step(C.int(x), C.int(y), (*C.int)(unsafe.Pointer(&a[0])), (*C.int)(unsafe.Pointer(&n[0])))
+ copy(a, n)
+ }
+}
+
+// Keep the channels visible from Go.
+var chans [4]chan bool
+
+//export GoStart
+// Double return value is just for testing.
+func GoStart(i, xdim, ydim, xstart, xend, ystart, yend C.int, a *C.int, n *C.int) (int, int) {
+ c := make(chan bool, int(C.MYCONST))
+ go func() {
+ C.DoStep(xdim, ydim, xstart, xend, ystart, yend, a, n)
+ c <- true
+ }()
+ chans[i] = c
+ return int(i), int(i + 100)
+}
+
+//export GoWait
+func GoWait(i C.int) {
+ <-chans[i]
+ chans[i] = nil
+}
--- /dev/null
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+extern void Step(int, int, int *, int *);
+extern void DoStep(int, int, int, int, int, int, int *, int *);
+extern const int MYCONST;
goarch=$(go env GOARCH)
function cleanup() {
- rm -f plugin*.so unnamed*.so iface*.so issue*
+ rm -f plugin*.so unnamed*.so iface*.so life.so issue*
rm -rf host pkg sub iface
}
trap cleanup EXIT
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o issue24351.so src/issue24351/plugin.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue24351 src/issue24351/main.go
./issue24351
+
+# Test for issue 25756
+GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o life.so issue25756/plugin
+GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue25756 src/issue25756/main.go
+# Fails intermittently, but 20 runs should cause the failure
+for i in `seq 1 20`;
+do
+ ./issue25756 > /dev/null
+done
MOVD 0(g), R4
MOVD gobuf_sp(R5), R1
MOVD gobuf_lr(R5), R31
+ MOVD 24(R1), R2 // restore R2
MOVD R31, LR
MOVD gobuf_ret(R5), R3
MOVD gobuf_ctxt(R5), R11