Linux suspend thread. #include <stdio. Sep 3, 2009 · You can send a signal to a particular thread, but the stop/abort action that is taken by the signal affects the whole process. What is the freezing of tasks?¶ The freezing of tasks is a mechanism by which user space processes and some kernel threads are controlled during hibernation or system-wide suspend (on some architectures). com: Concurrent Programming Topics - semaphores, condition variables Linux-mag. Oct 14, 2021 · I am running ubuntu 20. 1. cp src dst &. For a 'polite' stop to the process (prefer this for normal use), send SIGTSTP: kill -TSTP [pid] For a 'hard' stop, send SIGSTOP: kill -STOP [pid] Feb 7, 2013 · Instead you can use some other signals, say SIGUSR1 for suspending and SIGUSR2 for resuming: // at process start call init_pthread_suspending to install the handlers. Note: If the target thread is running on a different processer, it is not guaranteed to be suspended immediately. A thread can block a signal indefinitely. The pthreads library provides a set of APIs to create and manage threads. SIGCONT resumes it (not SIGINT) A process that is stopped by SIGSTOP can not be set to resume on receiving a certain key, because it isn't processing anything while it is stopped, but a parent or another process could be programmed to continue a child on receiving a key execve(2) under ptrace When one thread in a multithreaded process calls execve(2), the kernel destroys all other threads in the process, and resets the thread ID of the execing thread to the thread group ID (process ID). Oct 31, 2011 · If you want to bind a thread to a CPU right from the start, you can use the form of pthread_create with a pthread_attr_t argument. Threads have distinct alternate signal stack settings. It is Linux specific as the man page mentions. Furthermore, we’ll also look into different tools we can use to read the state of each process in our system. pthread_suspend_np suspends the execution of the thread thread until a call to pthread_wakeup_np. If another thread calls thread_resume. Some NPTL nonconformances occur only with older kernels: • The information returned by times(2) and getrusage(2) is per- thread rather than process-wide (fixed in Linux 2. resume functions in the windows API so thats ok, but how do i do that with pthreads? I have come up with a solution of my own but it has hit a snag. ) Other threads can call suspendMe and resumeMe to suspend/resume the thread. Calls to pthread_suspend_np(pthread_self()) do work immediately. Jul 16, 2010 · In order to answer the question, you would probably have an object thread_resume = threading. If you want a policy to be used as the default one, click the Make default button. This is my solution Sep 15, 2011 · The threads will awaken as a result of the arrival of the data they need to process. ) Yes, Linux does have the ability to actually "suspend" a process using the STOP/CONT signals, but this would be disruptive to the user interface because Chrome, now being literally frozen, could no longer respond to messages sent to it by Feb 16, 2021 · You cannot force another thread to suspend, so you have to ask it to do so, and then the thread can suspend itself. For stopping the execution of a particular thread, we can use one pthread condition object and use pthread_cond_timedwait() function for making the thread wait for a specific amount of time. 0 threads - Thread abstraction; including mutexes, conditions and thread private data. set(). Only the main thread is permitted to start a new session using setsid(2) (fixed in kernel 2. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. So I am forced to Restart to get mouse to function again. You are currently viewing LQ as a guest. From my research it seems that there is no "suspend" or "resume" ability at all. Other threads can call suspendMe and resumeMe to suspend/resume the thread. systemctl suspend should work out of the box. It is on Bus 001 Device 002. /a. " (Chrome consists of a set of related processes and threads. Thus, if the IRQ is shared, all of the interrupt handlers installed for it will be executed as usual after suspend_device_irqs(), even if the IRQF_NO_SUSPEND flag was not passed to request_irq() (or equivalent) by some of the IRQ’s users. , For every mutex, there might be a (hopefully short!) queue of threads that are waiting for their turn to acquire the mutex. These threads work together and they are related with another thread that blocks these threads, until a valid condition is met, and then let them continue working (I use Jun 10, 2024 · Creating and Managing Threads in Linux In Linux, threads are managed using the POSIX threads (pthreads) library. So here the program shows how the thread is suspended temporarily by using the suspend() function. Now Thread 2 starts executing and signals the condition variable. Linux Kernel: Wait for other threads to complete. pthread_join will suspend execution of the thread that has called it unless the target thread terminates Feb 10, 2015 · CoreCLR needs to be able to suspend threads in a managed application in order to run GC. The instructions were to create a text file named "enable-shutdown-reboot. Feb 21, 2019 · You can pause execution of a process by sending it a SIGSTOP signal and then later resume it by sending it a SIGCONT. Is there a better way to go about this? FSU Pthreads (POSIX Threads) Linux-mag. Jun 6, 2017 · This is the classical example for the use of a condition variable. A thread does not maintain a list of created threads, nor does it know the thread that created it. All threads within a process share the same address space. To suspend the process running in the background, use: kill -STOP %job_id The SIGSTOP signal stops (pauses) a process in essentially the same way Ctrl+Z does. The behavior is the same in this case, too. Oct 24, 2023 · The class thread represents a single thread of execution. Often returning after 'suspend' the pointer is stuck and page frozen, I have to hold down power button to turn off, wait a second & start bootup again, all Jul 6, 2017 · A thread can die with signals still queued for it; those signals will not be handled. No other thread can release the lock. Apr 4, 2020 · I put this thing (Cinnamon) in suspend often to keep what ever I'm working on active until later. First find out what states are supported: user@linux:_> cat /sys/power/state standby mem disk root@linux:~> echo -n mem > /sys/power/state # suspend to ram root@linux:~> echo -n disk > /sys/power/state # suspend to disk May 7, 2024 · systemctl suspend Command – Use systemd to suspend/hibernate from command line on Linux. // to suspend a thread use pthread_kill(thread_id, SUSPEND_SIG) // to resume a thread use pthread_kill(thread_id, RESUME_SIG) #include <signal. • Threads do not share interval timers (fixed in Linux 2. Here's an example: C library/kernel differences The original Linux system call was named sigsuspend(). Jun 13, 2018 · As I came to know creating and terminating thread abruptly using pthread_kill() everytime is not a good way to do, so I am going with suspend and resume method for a thread using thread1. The Linux Process States Feb 15, 2007 · Suspend/Resume thread in Linux Hi, I am getting problem in sending signal to specific thread. I can boot totally fine, suspending is my only issue. e. If you call pthread_suspend_np from an interrupt handler running in the context of the general purpose operating system thread (Linux), then all general purpose operations and 1. The thread will remain in waiting for the state until we Aug 19, 2017 · One is used to suspend and restart threads blocked on mutex, condition or semaphore operations. When i am sending SIGSTOP to a paricular thread whole process is stopped. Resuming timekeeping and unfreezing the scheduler tick. You can use kill to stop the process. Jan 21, 2011 · You can use a mutex, condition variable, and a shared flag variable to do this. Suspend a foreground process . Once suspended, a thread cannot be scheduled until another thread calls k_thread_resume() to remove the suspension. Sorted by: 254. thread _call _enter1 _delayed Submit a thread call to be executed at some point in the future, with an extra parameter. clear(), the thread will pause, and resume when another thread calls thread_resume. All but one of those are for threads that are waiting for some thing to happen. 2. The sigev_notify_thread_id field specifies a kernel thread ID, that is, the value returned by clone(2) or gettid(2) . If thread "A" was running when an interrupt handler started and the handler calls pthread_suspend_np, then the scheduler will save thread "A" and run another thread. , thread group) as a whole, and the signal will be delivered to an arbitrary thread within that process. pthread_resume_np(), pthread_continue(), pthread_suspend() - resume execution of a thread, continue execution of a thread, and suspend exe- cution of a thread SYNOPSIS PARAMETERS thread whose execution is to be suspended or resumed. When I take it out of suspend, the mouse will NOT engage or move. set() – The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. Imagine that there is a system call consisted with 100 assembly lines. The system still requires power in this state. pm-suspend Command – During suspend most devices are shutdown, and system state is saved in RAM. suspend and thread. Threads in the same process share: Nov 6, 2015 · In Linux multi-threading (pthread), I want to asynchronously suspend a thread while its performing a system call. 04 with a ryzen cpu. If the data is very large, just send a pointer through the pipe. There are also two modes combining suspend and hibernate: Linux Threads suspend/resume. Do not confuse this with pthread_setaffinity_np which requires an already running thread. 2 Answers. Currently I have to use the virtual keyboard to put in my password Threads do not share interval timers (fixed in kernel 2. If the Thread 1 is pushed out of RUNNING state by scheduler before it completes the step1. example: kill -STOP %3. Type the following command to become a root user: $ sudo -i. Aug 22, 2024 · Now if I suspend (sleep) the system and awaken it, P-state is still active, and the performance governor is still in charge, but I am no longer idling on max frequency. Threads begin execution immediately upon construction of the associated thread object (pending any OS scheduling delays), starting at the top-level function provided as a constructor argument. This frustrates me because if I'm working on something in Gimp, it does not always allow me to "restore/recover" previous usleep(3) Library Functions Manual usleep(3) NAME top usleep - suspend execution for microsecond intervals LIBRARY top Standard C library (libc, -lc) 4. if this does not work the problem is typically related to videocard. I am set up for dual boot with Linux Mint and Windows 10, and my folder is not encrypted. I am trying to wake from suspend using an Rii MX3 air mouse (htpc system) ID 0c45:5102 Microdia RF Controller. Suspending a process pauses it from using CPU and memory without terminating it completely – very useful! In this comprehensive guide, I‘ll show you the ins and outs of suspending Linux processes like a […] Oct 8, 2019 · So I just got Linux Mint MATE, I think 19. So there are thread. I am a newbie to Linux and I don't understand *too* much about the OS but I'm getting there. When I used suspend feature from the kernel by calling : echo mem > /sys/power/state, an issue occured on resume : XXXX read byte : -1 (errno : 3) At this moment most of the time my driver read callback is block in the semaphore wait (down_interruptible) Then, the kernel will try to freeze processes, suspend devices, wait a few seconds (5 by default, but configurable by the suspend. LinuxでSuspendThread的なAPIが無かったのでmutexで無理やりスレッドをsuspend/resumeしてみる。 とりあえず実装2回やってるけどOSの Mar 18, 2024 · In this article, we’ll learn about process states in Linux. May 8, 2018 · I use ncurses (kind of graphical windows in the terminal) where I have added some buttons and I want to click on the button to suspend the thread and click again to resume it. pkla" (text of file in SIGEV_THREAD_ID (Linux-specific) As for SIGEV_SIGNAL, but the signal is targeted at the thread whose ID is given in sigev_notify_thread_id, which must be a thread in the same process as the caller. org, a friendly and active Linux Community. Jun 29, 2010 · Here in the Thread 1 , the step 2 is not guaranteed to be atomic. how to suspend a thread before another thread finishes its work. out hola salut servus Thread 1: top of stack near 0xb7dd03b8; argv_string=hola Thread 2: top of stack near 0xb75cf3b8 Jul 13, 2021 · Sometimes there is an urgency to suspend these threads for some reasons. From the man page of pause: pause() causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function. Suspending a thread that is already suspended has no additional effect. Checked dmesg for more information: $ sudo systemd provides native commands for suspend, hibernate and a hybrid suspend. On ``old'' kernels (2. Linux suports a special attribute pthread_attr_setaffinity_np, which allows the binding of a thread to a certain CPU set. I run Firefox from the command line with this command: firefox. However, with the addition of real-time signals in Linux 2. When one of the CPUs is woken up (by a non-timer hardware interrupt), it leaves the idle state entered in the last step of the preceding suspend transition, restarts the timekeeping (unless it has been restarted already by another CPU that woke up earlier) and the scheduler tick on that CPU is unfrozen. CoreCLR needs to be able to suspend threads in a managed application in order to run GC. In the earlier implementation of Linux threads, it was possible to stop a single thread with SIGSTOP, but this behaviour has now been fixed to conform to the Posix standard (so it stops all threads in the process). I want to know whether SUSPEND/RESUME of thread is possible via SIGSTP and SIGCONT signal or anyother way other than the combination of "mutex and conditional wait". /mt_without_handler Thread ID (main thread): 3152 Thread ID: 3153 Thread ID: 3154 Thread ID: 3155 ^CHandler thread ID: 3152 ^CHandler thread ID: 3152 ^CHandler thread ID: 3152. Note that the IRQF_NO_SUSPEND flag affects the entire IRQ and not just one user of it. Dec 14, 2010 · Welcome to LinuxQuestions. resume(), whenever needed. Mar 18, 2024 · $ . something, most recent, but whenever I close my laptop and it suspends, it crashes the OS. In your thread, you check thread_resume. Jan 31, 2018 · I am implementing POSIX threading in my library but havent found any function for suspending or resuming a pthread_t. The Linux Process States Apr 7, 2015 · all the machines I have Kali on do not crash upon unsuspend, after the system being suspended by issuing: root@exploit:~# pm-suspend and just quickly pressing the power buttons. However, not all pthread implementations include pthread_barrier_t and the related functions (as they are an optional part of the POSIX threads specs), so here is the custom barrier implementation I mentioned in a comment to the original question. (By contrast, kill(2) can only be used to send a signal to a process (i. google linux blackscreen after suspend or look on the debian wiki in /suspend or /hibernate for some good methodical troubleshooting/fixing steps In the following run, on a system providing the NPTL threading implementation, the stack size defaults to the value given by the "stack size" resource limit: $ ulimit -s 8192 # The stack size limit is 8 MB (0x800000 bytes) $ . As we know, it's not possible to simulate the "process" in the ucos-ii by simply adding a flag in "while" loop in the pthread's call-back function to Nov 5, 2023 · As a Linux system administrator, you‘ll eventually need to temporarily suspend running processes to manage resources, prioritize tasks, and debug issues. If specific data needs to go to specific threads you need one pipe per thread. flags Flags to be used by The valid values are: The target thread's suspension count is decremented by one. 2007 Rafael J. Sep 3, 2010 · sleep() function does not cease a specific thread, but it stops the whole process for the specified amount of time. As I will be traveling soon. This function is a non-portable Realtime Linux extension. The issue is: If I leave the laptop alone and let it go into suspend the keyboard not longer works at all. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. We need to enable and test implementation of thread suspension for Mac. 0 root hub Bus 007 Device 001: ID 1d6b:0002 Feb 11, 2018 · You can use the file /sys/power/state to do this. the one to be used without writing anything into /sys/power/mem_sleep) is either “deep” (on the majority of systems supporting suspend-to-RAM) or “s2idle”, but it can be overridden by the value of the mem_sleep_default parameter in the kernel command line. Let's assume these are defined globally: pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; pthread_cond_t cond = PTHREAD_COND_INITIALIZER; int play = 0; 1) check lock owner 2) if lock is owned, put thread in waiting queue 3) suspend this thread until THE THREAD THAT OWNS THE LOCK sends a wake up signal. 12). These steps should be performed as an atomic operation so that the correct behaviour is followed for all threads acquiring/releasing the mutex, no matter Freezing of tasks¶. Signal SIGUSR1 suspends the thread by calling pause() and SIGUSR2 resumes the thread. Attempted to retest by placing the system in systemctl suspend, or systemctl sleep: issue seems to occur intermittently. thread". 1 kernels), there are only 32 signals available and the kernel reserves all of them but two: SIGUSR1 and SIGUSR2. 26. The precise semantics of threads differ from one operating system to another, but in general the threads of a single program are akin to multiple processes—except that they share one address space (that is, they can all examine Apr 24, 2017 · Auto Shutdown, Reboot, Suspend, Hibernate Your Linux System At A Specific Time; Automatically Wake Up Your Linux System From Sleep Or Hibernation Mode; Reptyr – Move A Running Process From One Terminal To Another Without Closing It; How To Add Linux Commands To The Queue And Execute Them One By One; How To Display Process Information Using We would like to show you a description here but the site won’t allow us. Only the main thread is permitted to make the process into a process group leader using setpgid(2) (fixed in kernel 2. I have it set so it doesn't suspend, but it drains the battery. Nov 12, 2017 · A common trick, when coding a multi-threaded program (and wanting to handle external signals like SIGTERM) is to use a pipe(7) to your own process and poll(2) that pipe in some other thread (you might also consider the Linux specific signalfd(2)), with a signal hander write(2)-ing a byte or a few of them into that pipe. Jul 21, 2014 · I believe gmch's answer should solve the original question. Wysocki <rjw @ sisk. 0 and early 2. Jul 30, 2004 · This is required because i have to port some Windows code to linux and there is this class CPrcThread which is an abstraction for threads. Particularly, we’ll learn about each of the five different states of a Linux process during the various parts of the lifecycle. 9). Apr 5, 2022 · The function k_thread_suspend() can be used to suspend any thread, including the calling thread. In some operating systems, such as GNU/Linux and Solaris, a single program may have more than one thread of execution. Is it OK to use this way? This question has many answers how to suspend/resume a thread, but I want to know what is wrong with my approach. The pthread_suspend_np subroutine immediately suspends the execution of the pthread specified by thread. Because you don't know exactly where the thread will be during a suspend there are a lot of different things which could go wrong. 16). The browser runs and you can see some strange output on the terminal. For this reason May 4, 2018 · In most operating systems, the object that represents a thread can be in exactly one of several different queues. This function makes a thread temporarily cease execution. A thread can change a given signal's disposition (to SIG_IGN, for example), though this is a per-process attribute, not a per-thread one. You are now back to normal shell: $ id. Jun 17, 2019 · Just for curiosity I wanted to implement suspending and resuming the thread, so I used signals and used pause() in the signal handler. Let me give you an example you can see. For systemctl hibernate to work on your system you might need to follow the instructions at #Hibernation. I thought of something like activate an application thread, make the super thread sleep for X time (cpu budget) and then wake up and suspend the application thread until next time. Dec 31, 2023 · I have some instructions on how to remove the suspend option from Mate's shutodown dialog box (see image below), but it doesn't work on my new install with Mate 1. g. Submit a thread call work item for immediate execution, with an extra parameter. The thread will go from running state to waiting state. 10). On successful return from pthread_suspend_np, the suspended pthread is no longer executing. This manual page is part of the POSIX Programmer's Manual. Jul 11, 2018 · The only way to escape those screens and boot normally is to remove the battery and put it back in. It worked on previous versions. Threads allow multiple functions to execute concurrently. The other is used for thread cancellation. This is the default interface used in Arch Linux. So, LinuxThreads has no choice but use those two signals. Currently CoreCLR PAL implements threads suspension using signals on Linux. 10 Debugging Programs with Multiple Threads. Creating Threads To create a thread, you can use the pthread_create function. Dec 2, 2015 · There are some thread implementations that allow for external suspension of a thread but its not a recommended or ideal practice because it leaves the thread memory and accessors in an undefined state (i. Most modern Linux distro only needs to use the systemctl command. what happens to the variables that you're using within that thread? what if you locked a shared memory location with a mutex?). Linux » Suspending Thread from other Thread under *nix properly Author Topic: Suspending Thread from other Thread under *nix properly (Read 959 times) Mar 18, 2024 · $ . pause () causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function. com: The Fibers of Threads - Discussion of how Linux threads work Platform independent threads: Gnome GLib 2. A blocked signal is not dropped -- it remains queued for the thread and will . Name pause - suspend the thread until a signal is received Nov 7, 2023 · Experiencing inability to recover Debian Linux 12 from sleep/suspend, forcing me to reboot in order to continue working. Example. When Thread 1 resumes execution it will finish the remaining low level instructions and starts waiting. Aug 12, 2024 · The following policies are available for the breakpoints that suspend program execution: All: all threads are suspended when any of the threads hits the breakpoint. Example Resuming timekeeping and unfreezing the scheduler tick. API documentation for the Rust `stop_thread` crate. Oct 21, 2019 · Sleep (suspend or standby) This mode is also known as the standby, suspend, or suspend-to-ram mode. Now run command as root user: # date # id. How to do/implement this? Take below LED blinking code for reference. Capabilities(7) Miscellaneous Information Manual Capabilities(7) NAME top capabilities - overview of Linux capabilities DESCRIPTION top For the purpose of performing permission checks, traditional UNIX implementations distinguish two categories of processes: privileged processes (whose effective user ID is 0, referred to as superuser or root), and unprivileged processes (whose effective UID is suspend [-f] The -f option force the suspend, even if the shell is a login shell. A process like Chrome might not have input focus on the user interface but still be "running. From the man page of pause: pause () causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function. In this mode, Linux saves the current state of the system into the RAM and cuts the power supply of all devices except the RAM. suspend() and thread1. If pthread_suspend_np is called for a pthread that is already suspended, the pthread is unchanged and pthread_suspend_np returns successful. For example, you can share an Arc<AtomicBool> with the thread, and the thread checks its value regularly with a loop like Dec 29, 2013 · In your case since the main calls it, main thread will terminate whereas your spawned threads will continue to execute. Jul 15, 2013 · SIGSTOP stops a process, and. Does linux not support any suspend/resume operations on threads? So the only way to get suspen Mar 18, 2024 · In this article, we’ll learn about process states in Linux. E. Aug 26, 2016 · pthread_kill affects the entire process, so it cannot be used to suspend threads, but is there a low level system call for this in Linux/Windows/Darwin? The reason is that there should be a diagnostics module that runs itself on a different thread. So ultimately it's going to involve some form of message that you communicate to the thread in some manner. The operating system (OS) always delivers the signal to the main thread. lsusb - Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3. Nov 6, 2017 · During the development of a profiling framework I ran into the following problem, that I need to suspend all running threads (including the main thread) if the program receives a signal (namely SIGUSR1 for example) and I am interested if there is a possibility of the following workflow can be implemented on Linux/POSIX systems: Oct 24, 2023 · For example, a first-in-first-out realtime scheduler (SCHED_FIFO in Linux) would suspend the current thread and put it on the back of the queue of the same-priority threads that are ready to run (and if there are no other threads at the same priority, yield has no effect). wait() at convenient times. • Threads do not share resource limits (fixed in Linux 2. Thread: only the thread which hits the breakpoint is suspended. My try was that this "super thread" with higher priority is suspending the other threads if they overcome their cpu budget. Feb 22, 2012 · recently I set out to port ucos-ii to Ubuntu PC. tgkill() sends the signal sig to the thread with the thread ID tid in the thread group tgid. This is mostly used in cases where the main thread is only required to spawn threads and leave the threads to do their job. Let's explore some of these APIs with code snippets. pm_test_delay module parameter), resume devices and thaw processes. pl>, GPL I. When the system is started/waked-up again, the Linux restores the saved state from the RAM instead of booting the system. 2, the fixed- size, 32-bit sigset_t type supported by that system call was no longer fit for purpose. usleep(3) Library Functions Manual usleep(3) NAME top usleep - suspend execution for microsecond intervals LIBRARY top Standard C library (libc, -lc) nanosleep() suspends the execution of the calling thread until either at least the time specified in *duration has elapsed, or the delivery of a signal that triggers the invocation of a handler in the calling thread or that terminates the process. You wait on a mutex and notify a thread when a certain condition is fulfilled; this way you don't need to allocate a new thread when you need one, but this is not always a good thing, if you wish to save memory. Jul 13, 2012 · Signal SIGUSR1 suspends the thread by calling pause() and SIGUSR2 resumes the thread. The default suspend variant (ie. NAME top pause — suspend the thread until a signal is received Feb 1, 2018 · There is a reason that suspend and resume do not exist in posix and many others, they are inherently unsafe. Thread operations include thread creation, termination, synchronization (joins,blocking), scheduling, data management and process interaction. Notice that now the mutex protects the m_SuspendFlag variable, ensuring that the thread is told to suspend, told to resume, and checks whether it should suspend or stay suspended under protection, making the code thread-safe. Assuming your workload is a single process (doesn't fork helpers running in background), you can use something like this: # start copy in background, store pid. ~800 MHz, then maybe a gigahertz, 2 gigahertz, a bit of load then 3 gigahertz, then back to lower clocks, this is the amount of variation. If any thread can process any data, then all threads can block on the same pipe and they will awaken round robin. To move suspended (sudo -i) job to the foreground Jul 7, 2021 · I put Debian 12 on an old HP laptop I have that originally came installed with Windows 7. h>. Suspend shell execution of 'sudo -i' command: # suspend -f. 6. Event() and then thread_resume. qdzvofmknltupyssatrmxrthdnwaeglzxmteljlibjkkywuciw