MJY-HUST commented on code in PR #2645:
URL: https://github.com/apache/brpc/pull/2645#discussion_r1615932183
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src/bthread/key.cpp:
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@@ -204,14 +205,54 @@ class BAIDU_CACHELINE_ALIGNMENT KeyTable {
SubKeyTable* _subs[KEY_1STLEVEL_SIZE];
};
+class KeyTableList {
+public:
+ KeyTableList() {
+ keytable = NULL;
+ }
+ ~KeyTableList() {
+ bthread::TaskGroup* const g = bthread::tls_task_group;
+ bthread::KeyTable* old_kt = bthread::tls_bls.keytable;
+ while (keytable) {
+ bthread::KeyTable* kt = keytable;
+ keytable = kt->next;
+ bthread::tls_bls.keytable = kt;
+ if (g) {
+ g->current_task()->local_storage.keytable = kt;
+ }
+ delete kt;
+ if (old_kt == kt) {
+ old_kt = NULL;
+ }
+ }
+ bthread::tls_bls.keytable = old_kt;
+ if(g) {
+ g->current_task()->local_storage.keytable = old_kt;
+ }
+ }
+ KeyTable* keytable;
+};
+
static KeyTable* borrow_keytable(bthread_keytable_pool_t* pool) {
- if (pool != NULL && pool->free_keytables) {
- BAIDU_SCOPED_LOCK(pool->mutex);
- KeyTable* p = (KeyTable*)pool->free_keytables;
+ if (pool != NULL && (pool->list->get()->keytable || pool->free_keytables))
{
+ pthread_rwlock_rdlock(&pool->rwlock);
+ KeyTable* p = pool->list->get()->keytable;
if (p) {
- pool->free_keytables = p->next;
+ pool->list->get()->keytable = p->next;
+ pthread_rwlock_unlock(&pool->rwlock);
return p;
}
+ pthread_rwlock_unlock(&pool->rwlock);
Review Comment:
嗯嗯，是的。
将锁移到KeyTableList内部感觉也是一样的，在borrow_keytable、和bthread_keytable_pool_destroy时仍然都需要加锁，不过这个锁可以是互斥锁了。在没有线程调用bthread_keytable_pool_destroy的前提下，两种模式加锁(加读锁、加互斥锁)都不会阻塞线程(不会调用futex_wait)，因此对性能没有太大影响，我自己测试的结果是这块地方不再是瓶颈了。
如果性能相近的话，感觉在外面用一把锁和一个变量对应一个bthread_keytable_pool_t是否要简单一些
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