futex_requeue函数原型为 static intfutex_requeue(u32 __user *uaddr1, unsigned intflags, u32 __user *uaddr2, intnr_wake, intnr_requeue, u32 *cmpval, intrequeue_pi); 这个函数的功能是,将uaddr1对应的futex等待队列出队最多 (nr_wake + nr_requeue) 个futex_q,先对出队的futex_q进行唤醒n...
在使用电脑过程中经常会出现某些错误代码，如0xc0000005错误故障，造成电脑无法正常运行，这要怎么办呢？
This patch provides the futex_requeue_pi functionality, which allows some threads waiting on a normal futex to be requeued on the wait-queue of a PI-futex. This provides an optimization, already used for (normal) futexes, to be used with the PI-futexes. This optimization is currently used...
futex_wait(cond->__data.__futex); lock(cond->__data.__lock); } while(...) unlock(cond->__data.__lock); lock(mutex); }pthread_cond_broadcast(cond) { lock(cond->__data.__lock); unlock(cond->__data.__lock); futex_requeue(cond->data.__futex, cond->mutex); ...
在使用电脑过程中经常会出现某些错误代码，如0xc0000005错误故障，造成电脑无法正常运行，这要怎么办呢？
原博文 linux 内核的futex - requeue 以及 requeue-pi 2017-05-04 19:05 −... bbqz007 0 2263 CF585F Digits of Number Pi 2019-12-08 20:19 −[题目](https://www.luogu.com.cn/problem/CF585F) 把$s$串所有长度为$\lfloor \frac{d}{2}\rfloor$的子串插入一个ACAM中,之后数位dp就好...
This patch does change the OP code value of FUTEX_CMP_REQUEUE_PI to 12 from 13. Since my test case is the only known user of this API, I felt this was the right thing to do, rather than leave a hole in the enumeration. I chose to continue using the _CMP_ modifier in the OP ...
put_futex_key(&key2); put_futex_key(&key1); cond_resched(); @@ -1594,6 +1598,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags, out_unlock: double_unlock_hb(hb1,hb2); hb_waiters_dec(hb2); /*
@@ -1939,15 +1939,27 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags, */ if (refill_pi_state_cache()) return -ENOMEM; /* * requeue_pi must wake as many tasks as it can, up to nr_wake * + nr_requeue, since it acquires the rt_mutex prior to * returni...
The reason being we need both callers to get the benefit of the futex_proxy_trylock_atomic() routine. futex_requeue() also enqueues the top_waiter on the rt_mutex via rt_mutex_start_proxy_lock(). Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Reviewed-by: Thomas Gleixner <tglx@...