Webb28 feb. 2024 · Sometimes you realize you want to see what a process is doing after the process has already started - in that case you can use strace to attach to an existing process by PID: # start `sleep 10` in the background $ sleep 10 & $ pgrep sleep xargs -n1 sudo strace -p. Here we use pgrep to get the process ID of the sleep process, then use … Webb14 nov. 2024 · futex_wait(&thread_info.pseudothread_tid, -1); // and then wait for it to terminate. futex_wait(&thread_info.pseudothread_tid, child_pid); 次に、cloneシステムコールを介して、疑似スレッドpseudothreadスレッドを複製し、ディスパッチして信号を処 …
futex(2): fast user-space locking - Linux man page - die.net
Webb10 dec. 2002 · futex_wait_queue_me 참고 내용. Finally after long investigation we saw a potential problem in kernel futexes that cuases apps or system freezes that eventually people see waitForCondition state from logcat. we invenstigated extensively and saw a potential problem in futexes, most of the app threads that launch by system server (in … Webb说到Android中的native crash，肯定是绕不开debuggerd守护进程的，但在Android P上，Android移除了debuggerd的守护进程，改为使用tombstoned来进行socket通信。. 不过大致流程是没有变化的，只是对其中的一些位置进行了重构。. 针对进程出现的不同状态，Linux Kernel会发送对应的 ... ebs stock prediction
Basics of Futexes - Eli Bendersky
Webb8 jan. 2024 · Now, rt_waiter of futex_wait_requeue_pi() is a node in the waiters list of our PI futex. Step 4. Here we’ll set the userspace value of the futex, also known as the futex-word, to 0. This is vital so that when the self-requeuing occurs, the call to futex_proxy_trylock_atomic() will succeed and wake the top waiter of the source futex, … WebbFUTEX_WAIT この操作は futex アドレス uaddrに指定された値 valがまだ格納されているかどうかを不可分操作で検証し、 sleep 状態で この futex アドレスに対して FUTEX_WAKEが実行されるのを待つ。 timeout引き数が NULL でない場合、その内容は待ち時間の最大値を表す (この停止時間はシステムクロックの粒度に切り上げられ、 NULL の場合、 呼 … Webb19 feb. 2016 · futex主要有futex_wait和futex_wake两个操作： int futex_wait(int *uaddr, int val) ; int futex_wake(int *uaddr, int n) ; 内核会动态维护一个跟uaddr指向的锁变量相关的等待队列。 注意futex_wait的第二个参数，由于用户态trylock与调用futex_wait之间存在一个窗口，其间lockval可能发生变化（比如正好有人unlock了）。 所以用户态应该将自己看到 … ebs surcharge