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Thread might actually be detached, so need to handle that

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This commit is contained in:
Brenton Bostick 2024-05-21 12:10:00 -04:00
parent dca77cb0d2
commit e32fecd16d
1 changed files with 51 additions and 1 deletions
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52
java/jni/com_zerotierone_sdk_Node.cpp
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@ -111,6 +111,44 @@ namespace {
bool finishInitializing();
};
//
// RAII construct for calling AttachCurrentThread and DetachCurrent automatically
//
struct ScopedJNIThreadAttacher {
JavaVM *jvm;
JNIEnv **env_p;
jint getEnvRet;
ScopedJNIThreadAttacher(JavaVM *jvmIn, JNIEnv **env_pIn, jint getEnvRetIn) :
jvm(jvmIn),
env_p(env_pIn),
getEnvRet(getEnvRetIn) {
if (getEnvRet != JNI_EDETACHED) {
return;
}
jint attachCurrentThreadRet;
if ((attachCurrentThreadRet = jvm->AttachCurrentThread(env_p, NULL)) != JNI_OK) {
LOGE("Error calling AttachCurrentThread: %d", attachCurrentThreadRet);
assert(false && "Error calling AttachCurrentThread");
}
}
~ScopedJNIThreadAttacher() {
if (getEnvRet != JNI_EDETACHED) {
return;
}
jint detachCurrentThreadRet;
if ((detachCurrentThreadRet = jvm->DetachCurrentThread()) != JNI_OK) {
LOGE("Error calling DetachCurrentThread: %d", detachCurrentThreadRet);
assert(false && "Error calling DetachCurrentThread");
}
}
};
/*
* This must return 0 on success. It can return any OS-dependent error code
@ -197,11 +235,23 @@ namespace {
jint getEnvRet;
assert(ref->jvm);
if ((getEnvRet = ref->jvm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6)) != JNI_OK) {
getEnvRet = ref->jvm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6);
if (!(getEnvRet == JNI_OK || getEnvRet == JNI_EDETACHED)) {
LOGE("Error calling GetEnv: %d", getEnvRet);
assert(false && "Error calling GetEnv");
}
//
// Thread might actually be detached.
//
// e.g:
// https://github.com/zerotier/ZeroTierOne/blob/91e7ce87f09ac1cfdeaf6ff22c3cedcd93574c86/node/Switch.cpp#L519
//
// Make sure to attach if needed
//
ScopedJNIThreadAttacher attacher{ref->jvm, &env, getEnvRet};
if (env->ExceptionCheck()) {
LOGE("Unhandled pending exception");
return;