Question about GetObjectMonitorUsage() JVMTI function

[Yasumasa Suenaga]

Hi all,

I wonder why JvmtiEnvBase::get_object_monitor_usage() (implementation of GetObjectMonitorUsage()) does not perform at safepoint.

Monitor owner would be acquired from monitor object at first [1], but it would perform concurrently.
If owner thread is not suspended, the owner might be changed to others in subsequent code.

For example, the owner might release the monitor before [2].


Thanks,

Yasumasa


[1] http://hg.openjdk.java.net/jdk/jdk/file/76a17c8143d8/src/hotspot/share/prims/jvmtiEnvBase.cpp#l973
[2] http://hg.openjdk.java.net/jdk/jdk/file/76a17c8143d8/src/hotspot/share/prims/jvmtiEnvBase.cpp#l996