54     JavaVM *jvm = user_data;  in s_detach_jvm_from_thread()  local
56     /* we don't need this JNIEnv, but this is an easy way to verify the JVM is still valid to use */  in s_detach_jvm_from_thread()
58     JNIEnv *env = aws_jni_acquire_thread_env(jvm);  in s_detach_jvm_from_thread()
60         (*jvm)->DetachCurrentThread(jvm);  in s_detach_jvm_from_thread()
62         aws_jni_release_thread_env(jvm, env);  in s_detach_jvm_from_thread()
67 static JNIEnv *s_aws_jni_get_thread_env(JavaVM *jvm) {  in s_aws_jni_get_thread_env()  argument
73     if ((*jvm)->GetEnv(jvm, (void **)&env, JNI_VERSION_1_6) == JNI_EDETACHED) {  in s_aws_jni_get_thread_env()
94         jint result = (*jvm)->AttachCurrentThreadAsDaemon(jvm, &env, &attach_args);  in s_aws_jni_get_thread_env()
96         jint result = (*jvm)->AttachCurrentThreadAsDaemon(jvm, (void **)&env, &attach_args);  in s_aws_jni_get_thread_env()
107         /* This should only happen in event loop threads, the JVM main thread attachment is  in s_aws_jni_get_thread_env()
108          * managed by the JVM, so we only need to clean up event loop thread attachments */  in s_aws_jni_get_thread_env()
109 …_FATAL_ASSERT(AWS_OP_SUCCESS == aws_thread_current_at_exit(s_detach_jvm_from_thread, (void *)jvm));  in s_aws_jni_get_thread_env()
116 A simple system to support unpredictable JVM shutdowns.  In an ideal world, everyone would correctl…
118 them correctly, that's not a realistic expectation.  So we need to come up with a way for JVM shutd…
120 on the binding object is now garbage) after the JVM has shutdown (but before the process has killed…
126 … or zero for now).  We protect this set with a read-write lock.  Adding (CRT init) or removing (JVM
127 shutdown hook) a JVM from this set will take a write lock.  Acquiring a JNIEnv from a tracked JVM, …
130 Acquiring a JNIEnv succeeds if the JVM in question is in our set, and fails otherwise.  All users o…
140 read locks on a shared rw lock.  Only when the JVM shutdown hook calls into native is there read-wr…
156     JavaVM *jvm = NULL;  in s_jvm_table_add_jvm_for_env()  local
157     jint jvmresult = (*env)->GetJavaVM(env, &jvm);  in s_jvm_table_add_jvm_for_env()
158     AWS_FATAL_ASSERT(jvmresult == 0 && jvm != NULL);  in s_jvm_table_add_jvm_for_env()
161     AWS_FATAL_ASSERT(AWS_OP_SUCCESS == aws_hash_table_put(s_jvms, jvm, NULL, &was_created));  in s_jvm_table_add_jvm_for_env()
174     JavaVM *jvm = NULL;  in s_jvm_table_remove_jvm_for_env()  local
175     jint jvmresult = (*env)->GetJavaVM(env, &jvm);  in s_jvm_table_remove_jvm_for_env()
176     AWS_FATAL_ASSERT(jvmresult == 0 && jvm != NULL);  in s_jvm_table_remove_jvm_for_env()
178     AWS_FATAL_ASSERT(AWS_OP_SUCCESS == aws_hash_table_remove(s_jvms, jvm, NULL, NULL));  in s_jvm_table_remove_jvm_for_env()
191 JNIEnv *aws_jni_acquire_thread_env(JavaVM *jvm) {  in aws_jni_acquire_thread_env()  argument
194 …* lock already, the JVM shutdown hooks causes another thread to block on taking the write lock, an…  in aws_jni_acquire_thread_env()
196      * but since the JVM is going away, it's safe to just fail completely from here on out.  in aws_jni_acquire_thread_env()
211     int find_result = aws_hash_table_find(s_jvms, jvm, &element);  in aws_jni_acquire_thread_env()
217     JNIEnv *env = s_aws_jni_get_thread_env(jvm);  in aws_jni_acquire_thread_env()
232 void aws_jni_release_thread_env(JavaVM *jvm, JNIEnv *env) {  in aws_jni_release_thread_env()  argument
233     (void)jvm;  in aws_jni_release_thread_env()
467         "Attempt to use a JVM that has already been destroyed"),
470         "OutOfMemoryError has been raised from JVM."),