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JNI: Attach Android thread to JRE, is it safe?

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This commit is contained in:
khanhduytran0 2020-09-09 06:09:50 +07:00
parent 1690938b3b
commit 8a6d23a06f
4 changed files with 12 additions and 4 deletions
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2
app/src/main/jni/egl_bridge.c
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@ -154,7 +154,7 @@ JNIEXPORT jboolean JNICALL Java_org_lwjgl_glfw_GLFW_nativeEglMakeCurrent(JNIEnv*
printf("First frame error: %p\n", eglGetError());
#endif
isEglMakeCurrentCalled = 1;
isInputReady = true;
return success == EGL_TRUE ? JNI_TRUE : JNI_FALSE;
}

7
app/src/main/jni/input_bridge.c
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@ -3,7 +3,12 @@
#include "utils.h"
JNIEXPORT void JNICALL Java_net_kdt_pojavlaunch_LWJGLInputSender_sendDataToJRE(JNIEnv* env, jclass clazz, jint type, jstring data) {
if (isEglMakeCurrentCalled == 1) {
if (isInputReady) {
if (!isAndroidThreadAttached) {
(*runtimeJavaVMPtr)->AttachCurrentThread(runtimeJavaVMPtr, &runtimeJNIEnvPtr, NULL);
isAndroidThreadAttached = true;
}
// Convert Dalvik string to JRE string: should or use directly?
char *data_c = (char*)(*env)->GetStringUTFChars(env, data, 0);
jstring data_jre = (*runtimeJNIEnvPtr)->NewStringUTF(runtimeJNIEnvPtr, data_c);

2
app/src/main/jni/jre_launcher.c
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@ -68,7 +68,7 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
*/
} else if (dalvikJavaVMPtr != vm) {
runtimeJavaVMPtr = vm;
(*vm)->GetEnv(vm, (void**) &runtimeJNIEnvPtr, JNI_VERSION_1_4);
// (*vm)->GetEnv(vm, (void**) &runtimeJNIEnvPtr, JNI_VERSION_1_4);
}
LOGD("JNI_OnLoad returning()");
return JNI_VERSION_1_4;

5
app/src/main/jni/utils.h
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@ -1,13 +1,16 @@
#ifndef _BINARY_UTILS_H_
#define _BINARY_UTILS_H_
#include <stdbool.h>
JavaVM *runtimeJavaVMPtr;
JNIEnv *runtimeJNIEnvPtr;
JavaVM *dalvikJavaVMPtr;
JNIEnv *dalvikJNIEnvPtr;
int isEglMakeCurrentCalled;
bool isInputReady;
bool isAndroidThreadAttached;
char** convert_to_char_array(JNIEnv *env, jobjectArray jstringArray);
jobjectArray convert_from_char_array(JNIEnv *env, char **charArray, int num_rows);