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8213092: Add more runtime locks for concurrent class unloading

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Add locks for calling CLDG::purge concurrently as well and for calling SystemDictionary::do_unloading concurrently.

Reviewed-by: eosterlund, hseigel
This commit is contained in:
Coleen Phillimore 2018-11-16 10:54:04 -05:00
parent dce8ff4dba
commit 673c68d993
6 changed files with 36 additions and 43 deletions
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5
src/hotspot/share/classfile/moduleEntry.cpp
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@ -204,7 +204,7 @@ bool ModuleEntry::has_reads_list() const {
// Purge dead module entries out of reads list.
void ModuleEntry::purge_reads() {
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
assert_locked_or_safepoint(Module_lock);
if (_must_walk_reads && has_reads_list()) {
// This module's _must_walk_reads flag will be reset based
@ -245,7 +245,6 @@ void ModuleEntry::module_reads_do(ModuleClosure* f) {
}
void ModuleEntry::delete_reads() {
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
delete _reads;
_reads = NULL;
}
@ -319,8 +318,6 @@ ModuleEntryTable::ModuleEntryTable(int table_size)
}
ModuleEntryTable::~ModuleEntryTable() {
assert_locked_or_safepoint(Module_lock);
// Walk through all buckets and all entries in each bucket,
// freeing each entry.
for (int i = 0; i < table_size(); ++i) {