Clock | 2009年用MFC写的一个桌面时钟，可语音报时，设置闹铃等。VS2008工程。

It varies between implementations, but generally, this is managed by the cache coherency protocol of the multiprocessor. In simplest terms, what happens is that when CPU1 writes to a memory location, that location will be invalidated in every other cache in the system. So that write will invalidate the line in CPU2's instruction cache as well as any (partially) decoded instructions in CPU2's uop cache (if it has such a thing). So when CPU2 goes to fetch/execute the next instruction, all those caches will miss and it will stall while things are refetched. Depending on the cache coherency protocol, that may involve waiting for the write to get to memory, or may fetch the modified data directly from CPU1's dcache, or things might go via some shared cache.

I had the same problem, man. I want to transplant tflite to the development board of CEVA. There is no problem in compiling. In the process of running, there is also an error in AddBuiltin(full_connect). At present, the only possible situation I guess is that some devices can not support tflite.

Collision detection depends on your needs.

• Bounding boxes are simple and can detect if the x, y edges of each object are not within one another. This is fine for fast moving games and things where you don't necessarily require point precision.
• Distance vectors are also simple and perfect solution for circle collisions. They calculate the difference in distance between two objects according to a radius prescribed with the hypotenuse of distX^2 + distY^2.
• Compound bounding objects are harder to calculate, especially for concave areas on objects of arbitrary shape. There are too many notable and novel approaches to collision detection beyond these to remark on here.

They're also increasingly complex depending on things like variability (if they're deformable objects, if they have particle seams, etc and 2d vs 3d object collision can be vastly different worlds as well. There are tons of articles, but I'll post one with implementation here

The problem is caused by multiple calls to pygame.display.update(). An update of the display at the end of the application loop is sufficient. Multiple calls to pygame.display.update() or pygame.display.flip() cause flickering.

Remove all calls to pygame.display.update() from your code, but call it once at the end of the application loop:

On Linux, the CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID clocks are not settable. This is noted in various places in the man 2 clock_getres manpage, including the NOTES section linked to above:

According to POSIX.1-2001, a process with "appropriate privileges" may set the CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID clocks using clock_settime(). On Linux, these clocks are not settable (i.e., no process has "appropriate privileges").

(That text was moved from BUGS to NOTES about a year ago, so if you haven't updated your manpages recently, you'll find it in BUGS, close to the end. About the same time that it was moved to NOTES, it was also noted in the individual descriptions of the two clocks.)

Recent versions of the manpage also list that as a possible reason for the EINVAL return code (it was always a possible reason, but only recently documented).

You have to calculate the movement per frame depending on the frame rate.

pygame.time.Clock.tick returns the number of milliseconds since the last call. When you call it in the application loop, this is the number of milliseconds that have passed since the last frame. When you call it without a parameter (framerate=0), the FPS are unlimited.

Define the distance in pixels that the player should move per second (move_per_second). Then compute the distance per frame in the application loop:

Right now, you're defining the size of the ellipses based on a transformation of sin(y). A transformation means it looks like a * sin(b * y + c) + d, and in this case you have

• a = tileSize / 2
• b = 300 / 60 = 5
• c = frameCount
• d = tileSize / 2

If you want to do a different pattern, you need to use a transformation of sin(theta) where theta is the "angle" of the dot (I put "angle" in quotes because it's really the angle from the vector from the center to the dot and some reference vector).

I suggest using the atan2() function.

Solution:

not sure this is what you need but here is an attempt, this will show the tie left till midnight using the time of your device

Your table is not being rendered properly because you are declaring it like this:

Is "#8db600"" supposed to be an attribute or an attribute value? Either way, you didn't finish either declaration, so it becomes a syntax error. Remove the stray "#8db600"".

Additionally, remove that duplicate declaration of the currentTime() function which is superfluous.