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提交 020f4b22 创建 作者: Nickolai Zeldovich's avatar Nickolai Zeldovich
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trying to track down some race condition..

上级 6d913c9f
显示空白字符变更
内嵌 并排
正在显示 包含 6 行增加 和 2 行删除
kernel/gc.cc
浏览文件 @ 020f4b22
...@@ -51,7 +51,11 @@ gc_free_tofreelist(atomic<rcu_freed*> *head, u64 epoch) ...@@ -51,7 +51,11 @@ gc_free_tofreelist(atomic<rcu_freed*> *head, u64 epoch)
int nfree = 0; int nfree = 0;
rcu_freed *r, *nr; rcu_freed *r, *nr;
for (r = *head; r != NULL; r = nr) { r = *head;
while (!std::atomic_compare_exchange_strong(head, &r, (rcu_freed*) 0))
; /* spin */
for (; r; r = nr) {
if (r->_rcu_epoch > epoch) { if (r->_rcu_epoch > epoch) {
cprintf("gc_free_tofreelist: r->epoch %ld > epoch %ld\n", r->_rcu_epoch, epoch); cprintf("gc_free_tofreelist: r->epoch %ld > epoch %ld\n", r->_rcu_epoch, epoch);
assert(0); assert(0);
...@@ -60,7 +64,6 @@ gc_free_tofreelist(atomic<rcu_freed*> *head, u64 epoch) ...@@ -60,7 +64,6 @@ gc_free_tofreelist(atomic<rcu_freed*> *head, u64 epoch)
r->do_gc(); r->do_gc();
nfree++; nfree++;
} }
*head = r;
return nfree; return nfree;
} }
...@@ -89,6 +92,7 @@ gc_move_to_tofree_cpu(int c, u64 epoch) ...@@ -89,6 +92,7 @@ gc_move_to_tofree_cpu(int c, u64 epoch)
// move delayed NEPOCH's adhead // move delayed NEPOCH's adhead
gc_state[c].delayed[fe].epoch += NEPOCH; gc_state[c].delayed[fe].epoch += NEPOCH;
assert(gc_state[c].delayed[fe].head == 0); assert(gc_state[c].delayed[fe].head == 0);
// XXX race with gc_delayed()?
return 0; return 0;
} }
......
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