Name: vsR10008 Date: 03/09/2004


JVMTI spec (version 0.3.8) says:

jvmtiError
GetThreadState(jvmtiEnv* env,
            jthread thread,
            jint* thread_state_ptr)

Get the state of a thread. The state of the thread is represented by the
answers to the hierarchical set
of questions below:

    * Alive?
          o Not alive.
                + Why not alive?
                      # New.
                      # Terminated (JVMTI_THREAD_STATE_TERMINATED)
          o Alive (JVMTI_THREAD_STATE_ALIVE)
                + Suspended?
                      # Suspended (JVMTI_THREAD_STATE_SUSPENDED)
                      # Not suspended
                + Interrupted?
                      # Interrupted (JVMTI_THREAD_STATE_INTERRUPTED)
                      # Not interrupted.
                + In native?
                      # In native code (JVMTI_THREAD_STATE_IN_NATIVE)
                      # In Java programming language code
                      ...

JVMTI_THREAD_STATE_IN_NATIVE 0x400000

    Thread is in native code--that is, a native method is running.
    This flag is not set when running VM compiled Java programming
    language code nor is it set when running VM code or
    VM support code.
    ...

But RI (b41) doesn't set the flag JVMTI_THREAD_STATE_IN_NATIVE
when native method is running.

To reproduce the failure please run the following script:

--- File: runme.sh
-------------------------------------------------------------------
JDK_PATH="/java/re/jdk/1.5.0/latest/binaries/solaris-sparc"

JVMTI_H_PATH="${JDK_PATH}/include"
CC="cc"

echo "...creating a.c"
cat - > a.c <<EOF

#include <stdio.h>
#include "jvmti.h"

static jvmtiEnv *jvmti = NULL;

JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void
*reserved) {
     jvmtiError err;
     jint res;

     res = (*jvm)->GetEnv(jvm, (void **) &jvmti,
           JVMTI_VERSION_1_0);

     if (res != JNI_OK || jvmti == NULL) {
         return JNI_ERR;
     }
     return JNI_OK;
}

JNIEXPORT void JNICALL
Java_a_check(JNIEnv *env, jclass cls, jthread thr) {
    jvmtiError err;
    jint stat;

    err = (*jvmti)->GetThreadState(jvmti, thr, &stat);
    if (err != JVMTI_ERROR_NONE) {
        printf("(GetThreadState) unexpected error: %d\n", err);
return;
    }
    if ( !(stat & JVMTI_THREAD_STATE_IN_NATIVE)) {
     printf("FAILURE: Thread state bit JVMTI_THREAD_STATE_IN_NATIVE
is not set\n");
    }

}

EOF

echo "...creating liba.so"

${CC} -G -KPIC -o liba.so -I${JDK_PATH}/include
-I${JDK_PATH}/include/solaris -I${JVMTI_H_PATH} a.c

echo "...creating a.java"

cat - > a.java <<EOF
public class a {
     native static void check(Thread thr);
     public static void main(String args[]) {
         System.loadLibrary("a");
         check(Thread.currentThread());
     }
}

EOF

echo "...creating a.class"

${JDK_PATH}/bin/javac -d . a.java

echo "...running a.class"
LD_LIBRARY_PATH=. CLASSPATH=. ${JDK_PATH}/bin/java -showversion
-agentlib:a a
------------------------------------------------------------------------
-

Running on b41, the execution log is as follows:

...creating a.c
...creating liba.so
...creating a.java
...creating a.class
...running a.class
java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b41)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b41, mixed mode)

FAILURE: Thread state bit JVMTI_THREAD_STATE_IN_NATIVE is not set

======================================================================