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Associate the environment with any thread that calls Android_JNI_GetEnv(), in case it's been manually created with pthread_create() or C++11.

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This commit is contained in:
Sam Lantinga 2013-12-07 11:19:52 -08:00
parent 44afc2a305
commit 5e656f8950
1 changed files with 13 additions and 11 deletions
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24
src/core/android/SDL_android.c
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@ -98,12 +98,10 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved)
* Create mThreadKey so we can keep track of the JNIEnv assigned to each thread * Create mThreadKey so we can keep track of the JNIEnv assigned to each thread
* Refer to http://developer.android.com/guide/practices/design/jni.html for the rationale behind this * Refer to http://developer.android.com/guide/practices/design/jni.html for the rationale behind this
*/ */
if (pthread_key_create(&mThreadKey, Android_JNI_ThreadDestroyed)) { if (pthread_key_create(&mThreadKey, Android_JNI_ThreadDestroyed) != 0) {
__android_log_print(ANDROID_LOG_ERROR, "SDL", "Error initializing pthread key"); __android_log_print(ANDROID_LOG_ERROR, "SDL", "Error initializing pthread key");
} }
else { Android_JNI_SetupThread();
Android_JNI_SetupThread();
}
return JNI_VERSION_1_4; return JNI_VERSION_1_4;
} }
@ -454,7 +452,8 @@ SDL_bool Android_JNI_GetAccelerometerValues(float values[3])
return retval; return retval;
} }
static void Android_JNI_ThreadDestroyed(void* value) { static void Android_JNI_ThreadDestroyed(void* value)
{
/* The thread is being destroyed, detach it from the Java VM and set the mThreadKey value to NULL as required */ /* The thread is being destroyed, detach it from the Java VM and set the mThreadKey value to NULL as required */
JNIEnv *env = (JNIEnv*) value; JNIEnv *env = (JNIEnv*) value;
if (env != NULL) { if (env != NULL) {
@ -463,7 +462,8 @@ static void Android_JNI_ThreadDestroyed(void* value) {
} }
} }
JNIEnv* Android_JNI_GetEnv(void) { JNIEnv* Android_JNI_GetEnv(void)
{
/* From http://developer.android.com/guide/practices/jni.html /* From http://developer.android.com/guide/practices/jni.html
* All threads are Linux threads, scheduled by the kernel. * All threads are Linux threads, scheduled by the kernel.
* They're usually started from managed code (using Thread.start), but they can also be created elsewhere and then * They're usually started from managed code (using Thread.start), but they can also be created elsewhere and then
@ -483,10 +483,6 @@ JNIEnv* Android_JNI_GetEnv(void) {
return 0; return 0;
} }
return env;
}
int Android_JNI_SetupThread(void) {
/* From http://developer.android.com/guide/practices/jni.html /* From http://developer.android.com/guide/practices/jni.html
* Threads attached through JNI must call DetachCurrentThread before they exit. If coding this directly is awkward, * Threads attached through JNI must call DetachCurrentThread before they exit. If coding this directly is awkward,
* in Android 2.0 (Eclair) and higher you can use pthread_key_create to define a destructor function that will be * in Android 2.0 (Eclair) and higher you can use pthread_key_create to define a destructor function that will be
@ -496,8 +492,14 @@ int Android_JNI_SetupThread(void) {
* Note: You can call this function any number of times for the same thread, there's no harm in it * Note: You can call this function any number of times for the same thread, there's no harm in it
* (except for some lost CPU cycles) * (except for some lost CPU cycles)
*/ */
JNIEnv *env = Android_JNI_GetEnv();
pthread_setspecific(mThreadKey, (void*) env); pthread_setspecific(mThreadKey, (void*) env);
return env;
}
int Android_JNI_SetupThread(void)
{
Android_JNI_GetEnv();
return 1; return 1;
} }