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x/mobile/exp/audio/al: Error when using `gomobile bind`: no current JVM #15804

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hajimehoshi opened this Issue May 23, 2016 · 2 comments

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hajimehoshi commented May 23, 2016

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.6.2 darwin/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/hajimehoshi/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GO15VENDOREXPERIMENT="1"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

What did you do?

Calling x/mobile/exp/audio/al functions with gomobile bind causes error: al: no current JVM. It seems like init in x/mobile/exp/audio/al is called just before setContext in x/mobile/bind/java/context_android.go is called, which means init in al is called without the JVM context set.

What did you expect to see?

No error.

@hajimehoshi

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hajimehoshi commented May 23, 2016

Calling x/mobile/exp/audio/al functions with...

Sorry but I meant "calling x/mobile/exp/audio/al functions in an init function with ..."

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envsh commented Jun 19, 2018

here only using audio/al package, so need mannual set mobileinit.current_vm and mobileinit.current_ctx global value.
Because mobileinit package is internal, so can we export a function for manually set the value?

this is a works but hacky way,

diff --git a/exp/audio/al/al_android.go b/exp/audio/al/al_android.go
index bce1f8d..dc85b8b 100644
--- a/exp/audio/al/al_android.go
+++ b/exp/audio/al/al_android.go
@@ -242,6 +242,9 @@ var (
        alcDestroyContextFunc     C.LPALCDESTROYCONTEXT
 )
 
+func GetCurrentVMAddr() unsafe.Pointer{return mobileinit.GetCurrentVMAddr()}
+func GetCurrentCtxAddr() unsafe.Pointer{return mobileinit.GetCurrentCtxAddr()}
+
 func initAL() {
        err := mobileinit.RunOnJVM(func(vm, env, ctx uintptr) error {
                C.al_init(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx), &alHandle)
diff --git a/internal/mobileinit/ctx_android.go b/internal/mobileinit/ctx_android.go
index e0dc166..e0dea81 100644
--- a/internal/mobileinit/ctx_android.go
+++ b/internal/mobileinit/ctx_android.go
@@ -75,6 +75,9 @@ import (
        "unsafe"
 )
 
+func GetCurrentVMAddr() unsafe.Pointer{return unsafe.Pointer(&C.current_vm)}
+func GetCurrentCtxAddr() unsafe.Pointer{return unsafe.Pointer(&C.current_ctx)}
+
 // SetCurrentContext populates the global Context object with the specified
 // current JavaVM instance (vm) and android.context.Context object (ctx).
 // The android.context.Context object must be a global reference.
 
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