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104 lines
3.2 KiB
104 lines
3.2 KiB
/*****************************************************************************
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* env.c: shared code between Android modules.
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*****************************************************************************
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* Copyright (C) 2014-2015 VLC authors and VideoLAN
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*
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* Authors: Felix Abecassis <felix.abecassis@gmail.com>
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* Thomas Guillem <thomas@gllm.fr>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "utils.h"
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#include "env.h"
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#include <dlfcn.h>
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#include <jni.h>
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#include <pthread.h>
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#include <assert.h>
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/*
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* Android JNIEnv helper
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*/
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static pthread_key_t jni_env_key;
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static pthread_once_t jni_env_key_once = PTHREAD_ONCE_INIT;
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/* This function is called when a thread attached to the Java VM is canceled or
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* exited */
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static void
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jni_detach_thread(void *data)
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{
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JNIEnv *env = data;
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JavaVM *jvm;
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(*env)->GetJavaVM(env, &jvm);
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assert(jvm);
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(*jvm)->DetachCurrentThread(jvm);
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}
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static void jni_env_key_create()
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{
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/* Create a TSD area and setup a destroy callback when a thread that
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* previously set the jni_env_key is canceled or exited */
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pthread_key_create(&jni_env_key, jni_detach_thread);
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}
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JNIEnv *
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android_getEnvCommon(vlc_object_t *p_obj, JavaVM *jvm, const char *psz_name)
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{
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assert((p_obj && !jvm) || (!p_obj && jvm));
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JNIEnv *env;
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pthread_once(&jni_env_key_once, jni_env_key_create);
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env = pthread_getspecific(jni_env_key);
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if (env == NULL)
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{
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if (!jvm)
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jvm = var_InheritAddress(p_obj, "android-jvm");
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if (!jvm)
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return NULL;
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/* if GetEnv returns JNI_OK, the thread is already attached to the
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* JavaVM, so we are already in a java thread, and we don't have to
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* setup any destroy callbacks */
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if ((*jvm)->GetEnv(jvm, (void **)&env, JNI_VERSION_1_2) != JNI_OK)
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{
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/* attach the thread to the Java VM */
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JavaVMAttachArgs args;
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args.version = JNI_VERSION_1_2;
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args.name = psz_name;
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args.group = NULL;
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if ((*jvm)->AttachCurrentThread(jvm, &env, &args) != JNI_OK)
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return NULL;
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/* Set the attached env to the thread-specific data area (TSD) */
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if (pthread_setspecific(jni_env_key, env) != 0)
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{
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(*jvm)->DetachCurrentThread(jvm);
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return NULL;
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}
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}
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}
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return env;
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}
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