91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
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#include <assert.h>
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#include <jni.h>
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#include <alloca.h>
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#include <pthread.h>
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union env_union
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{
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void *void_env;
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JNIEnv *jni_env;
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};
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union env_union tmp;
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JNIEnv* env;
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JavaVM* jvm;
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JavaVMInitArgs vm_args;
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JavaVMOption options[1];
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jclass class_id;
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jmethodID method_id;
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jint result;
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long product(unsigned long n, unsigned long m) {
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if (m == 1) {
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return n;
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} else {
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int *p = alloca(sizeof (int));
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*p = n;
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return product (n, m-1) + *p;
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}
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}
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void *
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floobydust (void *p)
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{
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(*jvm)->AttachCurrentThread(jvm, &tmp.void_env, NULL);
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env = tmp.jni_env;
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class_id = (*env)->FindClass (env, "T");
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assert (class_id);
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method_id = (*env)->GetStaticMethodID (env, class_id, "printIt", "()V");
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assert (method_id);
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(*env)->CallStaticVoidMethod (env, class_id, method_id, NULL);
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(*jvm)->DetachCurrentThread(jvm);
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printf("%ld\n", product(5000,5000));
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(*jvm)->AttachCurrentThread(jvm, &tmp.void_env, NULL);
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env = tmp.jni_env;
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class_id = (*env)->FindClass (env, "T");
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assert (class_id);
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method_id = (*env)->GetStaticMethodID (env, class_id, "printIt", "()V");
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assert (method_id);
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(*env)->CallStaticVoidMethod (env, class_id, method_id, NULL);
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(*jvm)->DetachCurrentThread(jvm);
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printf("%ld\n", product(5000,5000));
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return NULL;
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}
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int
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main (int argc, const char** argv)
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{
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options[0].optionString = "-Xss320k";
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vm_args.version = JNI_VERSION_1_2;
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vm_args.ignoreUnrecognized = JNI_TRUE;
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vm_args.options = options;
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vm_args.nOptions = 1;
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result = JNI_CreateJavaVM (&jvm, &tmp.void_env, &vm_args);
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assert (result >= 0);
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env = tmp.jni_env;
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floobydust (NULL);
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pthread_t thr;
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pthread_create (&thr, NULL, floobydust, NULL);
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pthread_join (thr, NULL);
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return 0;
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}
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