How to write code to be executed before main() gets control?

How to write code to be executed before main() gets control?

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How to write code to be executed before main() gets control?
Tag : cpp , By : vferman
Date : November 25 2020, 07:22 PM

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PHP will not write file to directory via command prompt executed script but will write when executed in browser

Tag : php , By : Novi Indrayani
Date : March 29 2020, 07:55 AM
To fix this issue I will execute this command in Command Prompt
  The solution was to escape slashes

Any way to guarantee a code will always be executed on the main thread?

Tag : ios , By : RichAA
Date : March 29 2020, 07:55 AM
seems to work fine I sprinkle such methods with my BLOCK_UI() macro from https://github.com/gradha/ELHASO-iOS-snippets. At runtime the macro will assert if the method is not running on the main thread. The macro goes away in release builds because I consider calling such an API in the background a programmer error, but if you want to make an API which is permissive with the programmer, you can also check for the main thread and invoke yourself in the main thread if needed. Example:
if ([NSThread isMainThread]) {
    [self do_request:url];
} else {
    [self performSelectorOnMainThread:@selector(do_request:)
        withObject:url waitUntilDone:NO];

Perl script unable to write to database when executed in crontab despite being able to write if executed manually

Tag : php , By : David Marchant
Date : March 29 2020, 07:55 AM
To fix this issue When testing manually, you probably went to the correct working directory for the script to do the editing. Starting it from any other location would most likely have caused failure as well.
Use absolute pathes instead of relative to make sure you access the correct and existing directory. Include a cd /some/where ; before your command in the crontab. Cron sets your home directory, no matter where the called program sits.

Why main is the first thread to get executed in the following code every time i execute the code

Tag : java , By : Matt Watson
Date : March 29 2020, 07:55 AM
it fixes the issue The order of execution of different Java threads is unspecified and non-deterministic. When I ran your code for the first time, the first three lines were

Realm.io: Are write / read operations executed on the main thread?

Tag : ios , By : mansoor
Date : March 29 2020, 07:55 AM
should help you out Block is executed on the same thread as the thread that calls the write() method synchronously. In different words, if you call write() on the main thread, the block will be executed on the main thread.
dispatch_async(dispatch_queue_create("background", nil)) {

  // Some operations in a background thread ...

  try! realm.write {
    // this block will be executed on the background thread
dispatch_async(dispatch_queue_create("background", nil)) {

  // Some operations in a background thread ...

  dispatch_async(dispatch_get_main_queue()) {
    try! realm.write {
      // this block will be executed on the main thread
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