本文整理汇总了C++中Klass::biased_lock_revocation_count方法的典型用法代码示例。如果您正苦于以下问题：C++ Klass::biased_lock_revocation_count方法的具体用法？C++ Klass::biased_lock_revocation_count怎么用？C++ Klass::biased_lock_revocation_count使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Klass的用法示例。
在下文中一共展示了Klass::biased_lock_revocation_count方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: update_heuristics
static HeuristicsResult update_heuristics(oop o, bool allow_rebias) {
markOop mark = o->mark();
if (!mark->has_bias_pattern()) {
return HR_NOT_BIASED;
}
// Heuristics to attempt to throttle the number of revocations.
// Stages:
// 1. Revoke the biases of all objects in the heap of this type,
// but allow rebiasing of those objects if unlocked.
// 2. Revoke the biases of all objects in the heap of this type
// and don't allow rebiasing of these objects. Disable
// allocation of objects of that type with the bias bit set.
Klass* k = o->klass();
jlong cur_time = os::javaTimeMillis();
jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time();
int revocation_count = k->biased_lock_revocation_count();
if ((revocation_count >= BiasedLockingBulkRebiasThreshold) &&
(revocation_count < BiasedLockingBulkRevokeThreshold) &&
(last_bulk_revocation_time != 0) &&
(cur_time - last_bulk_revocation_time >= BiasedLockingDecayTime)) {
// This is the first revocation we've seen in a while of an
// object of this type since the last time we performed a bulk
// rebiasing operation. The application is allocating objects in
// bulk which are biased toward a thread and then handing them
// off to another thread. We can cope with this allocation
// pattern via the bulk rebiasing mechanism so we reset the
// klass's revocation count rather than allow it to increase
// monotonically. If we see the need to perform another bulk
// rebias operation later, we will, and if subsequently we see
// many more revocation operations in a short period of time we
// will completely disable biasing for this type.
k->set_biased_lock_revocation_count(0);
revocation_count = 0;
}
// Make revocation count saturate just beyond BiasedLockingBulkRevokeThreshold
if (revocation_count <= BiasedLockingBulkRevokeThreshold) {
revocation_count = k->atomic_incr_biased_lock_revocation_count();
}
if (revocation_count == BiasedLockingBulkRevokeThreshold) {
return HR_BULK_REVOKE;
}
if (revocation_count == BiasedLockingBulkRebiasThreshold) {
return HR_BULK_REBIAS;
}
return HR_SINGLE_REVOKE;
}