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This commit is contained in:
Serguei Spitsyn 2016-12-19 04:04:48 +00:00
commit dec261c784
1 changed files with 12 additions and 0 deletions
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12
hotspot/src/share/vm/classfile/moduleEntry.cpp
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@ -108,6 +108,18 @@ bool ModuleEntry::can_read(ModuleEntry* m) const {
}
MutexLocker m1(Module_lock);
// This is a guard against possible race between agent threads that redefine
// or retransform classes in this module. Only one of them is adding the
// default read edges to the unnamed modules of the boot and app class loaders
// with an upcall to jdk.internal.module.Modules.transformedByAgent.
// At the same time, another thread can instrument the module classes by
// injecting dependencies that require the default read edges for resolution.
if (this->has_default_read_edges() && !m->is_named()) {
ClassLoaderData* cld = m->loader_data();
if (cld->is_the_null_class_loader_data() || cld->is_system_class_loader_data()) {
return true; // default read edge
}
}
if (!has_reads()) {
return false;
} else {