slock | Suckless simple X display locker fork with transparency | Android library
kandi X-RAY | slock Summary
kandi X-RAY | slock Summary
simple screen locker utility for X.
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QUESTION
I am working in an experiment using RWMutex in Go, and I realized that is possible to have this behavior with the follow code:
- goroutine 1 - RLock
- goroutine 1 - RUnlock
- goroutine 2 - RLock
- goroutine 2 - RUnlock
- goroutine 2 - Lock
- goroutine 2 - Unlock
- goroutine 1 - Lock
- goroutine 1 - Unlock
ANSWER
Answered 2021-Aug-25 at 03:34This is because your code has a race condition in it. You read-lock the map to read it, make a decision, and then write-lock it. There is no guarantee that when you get the write lock, the condition you made the decision on still holds.
The correct way would be to retest the condition after locking:
QUESTION
I am implementing Room database in my new app. When setting up the database I get this error:
...ANSWER
Answered 2020-Oct-03 at 14:54Downgraded Kotlin from '1.4.10' to '1.3.50' helped.
QUESTION
I'm reading through this online book on x86 and I'm curious about an implementation detail in their example code for implementing a spin lock. In the example, they use a xchg
to set a memory location to 0 rather than a mov
and I'm trying to understand why that choice was made.
In the spin lock example there is a function, spinUnlock
which puts a 0
in the memory location [sLock]
. [sLock]
is set to 0
if the lock is free and 1
when it is aquired. The spinUnlock
function sets [sLock]
to 0
freeing the lock. The code follows:
ANSWER
Answered 2020-Oct-07 at 20:09Only the author can say why the choice was made.
A single mov dword [sLock],0
would work fine; and an xchg eax, [sLock]
(which has an implied lock
) is likely to be more expensive (for both performance and code size).
All of the example's code is awful (e.g. no pause
in the spinLock
routine where it should be used despite having pause
in places where it shouldn't be used at all); and their choice of example isn't good either.
Note: using spinlocks in user-space is "almost never" sane because the OS may do a task switch after you acquire a lock but before you release it, causing all other tasks to waste a massive amount of CPU time spinning with no hope of acquiring the lock.
QUESTION
I have two programs (namely dwm and slock). I want to trigger a function in dwm depending on events happening in slock and vice versa. The requirement is that both should be independent and run without the other program and also work together.
What is the easiest and/or the best (most efficient) IPC solution/method?
...ANSWER
Answered 2020-Jun-28 at 10:35I've done it like Milag sugested in the comments:
a signal could trigger activity in the other proc; if you need a block of data as well, maybe use shared memory or R/W with a named pipe
QUESTION
I wanted to drop some columns from a table in my sqlite database. I created a new table (with a different name), inserted the appropriate data from the old table into the new table. Then I dropped the old table and renamed the new table to the old table's name. However I am getting this error
...ANSWER
Answered 2020-May-17 at 11:33What I see from your code:
- It seems that current version of DB on device (before migration) is 12.
- According to this:
QUESTION
I am a making a bot that when you do !train it says something in announcements and also messages the author and tells him to type finished when he finishes training which then either edits the message where it says training is underway or sends a new message to announcements.
...ANSWER
Answered 2020-Feb-26 at 14:37I would recommend using async/await
QUESTION
I have some adapter which use retrofit to get data right from web api and place it to recyclerview
...ANSWER
Answered 2020-Feb-16 at 20:02- Create an
@Entity Notice
which is your data type to be stored in your Room DB. - Create a View Model which is attached to your Activity/Fragment where you need to show this list.
- Use your ViewModel to store the list from API into your Room DB.
- Create a LiveData which observes on the DB and sends the updated list to the other view.
Code for Saving Data in DB. This needs to be run on Background Thread.
QUESTION
I'm working on an Android application that needs to crypt (and then to decrypt) file on the file system. I wrote an android test to test the code that I found on the web and I adapted for my needed. I try with to crypt a simple text and then try to decrypt it. The problem is when I try to decrypt it, some strange character appears at the beginning of the content that I want to crypt/decrypt. For example, I try to crypt/decrypt a string like this:
...ANSWER
Answered 2020-Jan-07 at 21:35Finally, I solve by myself. I post the solution just to help anybody that in the future will look for a similar situation. I mistake to retrieve the iv array in the encrypt
method, I was generating another iv vector instead of using the one contained in secretKeys
.
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