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1. Top results related to why was return to zero so successful?

   • why converting or parsing string to int return zero?

     Top Answer

     Answered Apr 03, 2011 · 5 votes

     From MSDN on Int32.TryParse here

     When this method returns, contains the 32-bit signed integer value equivalent to the number contained in s, if the conversion succeeded, or zero if the conversion failed. The conversion fails if the s parameter is nullptr, is not of the correct format, or represents a number less than MinValue or greater than MaxValue. This parameter is passed uninitialized.

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     1/5

   • Why does socket send() return successful code in case of cable connection was broken?

     Top Answer

     Answered Mar 06, 2020 · -1 votes

     I used the getsockopt() to check the validity of socket, instead of checking return value from send(). It works. After knowing the socket being invalid, I closed it and re-created.

     The codes is from Simone at How to find the socket connection state in C?

     int error = 0;socklen_t len = sizeof (error);int retval = getsockopt (socket_fd, SOL_SOCKET, SO_ERROR, &error, &len);/// ....if (retval != 0) { /* there was a problem getting the error code */ fprintf(stderr, "error getting socket error code: %s\n", strerror(retval)); return;}if (error != 0) { /* socket has a non zero error status */ fprintf(stderr, "socket error: %s\n", strerror(error));}

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     2/5

   • Why does subprocess.run create return code 1 even if the command was successful?

     Top Answer

     Answered Sep 25, 2021 · 2 votes

     It totally depends on the value returned by your program with different arguments.

     For example, when I run the following on my computer (git is installed):

     result = subprocess.run(['git'], capture_output=True)-

     result.returncode is 1

     If I run git with parameter --version like this:

     result = subprocess.run(['git','--version'], capture_output=True)

     result.returncode is 0

     To really check if a program exists or not (on Windows) you could do something like:

     try: result = subprocess.run(['choco'], capture_output=True) print(result)except FileNotFoundError: print("Program not installed")

     Check out this official documentation on Subprocess

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     3/5

   • Why does adb return zero exit status in case of "failed to connect"?

     Top Answer

     Answered Dec 03, 2023 · 2 votes

     According to source code here, behind the scene the adb connect invokes adb_query that returns a char array. This char array contains the result of the socket request call, something that can be displayed as string in the terminal (your 'connection refused' message for instance).

     adb_query handles error scenarios as well but the issues that can be captured are more related to file descriptor (for socket communication) or memory allocation. When such cases happen then echo $? will return 1.

     That said, the answer to your question is, yes, this is the intended behaviour.

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     4/5

   • Return to zero CountdownEvent

     Top Answer

     Answered Jul 04, 2020 · 7 votes

     Edit

     public void Dispatch(){ using (var ev = new CountdownEvent(1)) { foreach (var task in <collection_of_tasks_to_start>) { ev.AddCount(); // start *task* here. Don't forget to pass *ev* to it! } ev.Signal(); ev.Wait(); }}// task codevoid Handler(CountdownEvent ev){ try { // do task logic } finally { ev.Signal(); }}

     Why and how this works?

     • If you haven't spawned any tasks nothing will happen and Dispatch will just finish normally.
     • ev.Signal makes sure that once ev.Wait is called, initial value of the counter is 0 and Wait will not block execution
     • If you spawned at least one task we have two cases to consider: fast- and slow-running tasks and understand how they affect execution at point where ev.Wait() is called. fast tasks, i.e. tasks that will complete before we reach the end. at the ev.Wait() the situation is equivalent to point 1.
     • slow tasks, i.e. tasks that haven't completed before we reach the end. at the ev.Wait() the counter is not equal to 0 anymore, because of all the ev.AddCount() executed. Thus, execution will hold.
     • once all running tasks complete (and have corresponding ev.Signal() lines executed) the counter drops to 0 and execution resumes exiting the routine

     Original answer

     You wrote:

     I am performing an operation that will create an unknown number of child operations (not tasks or threads)

     So what are they? You should do something like this:

     Other Answers

     Answered Dec 08, 2010 · 3 votes

     If you can use .NET 4.0 or Reactive Extensions for .NET 3.5 (which has a backport of the .NET 4 TPL features), you might check out the Barrier class. It allows you to coordinate multiple parallel tasks so that they do not continue until all participants in the barrier have signaled their arrival. It should also meet your requirement to have participants appear and disappear during the course of processing.

     Other Answers

     Answered Dec 08, 2010 · 2 votes

     So in essence you need an "on/off switch", not a synchronization object that can be set up with an arbitrary countdown. CountdownEvent is not appropriate for such cases.

     Why don't you just use a Semaphore

     with an initial count of one?

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     5/5

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2. stackoverflow.com › questions › 9549342Should I return 0 or 1 for successful function? [duplicate]

   stackoverflow.com › questions › 9549342

   • Cached

   The reason why main use 0 for success is that it is used as the exit code of the application to the operating system, where 0 typically means success and 1 (or higher) means failure. (Of course, you should always use the predefined macros EXIT_SUCCESS and EXIT_FAILURE.)

   Code sample

   if (my_func()) {

     ...

   }

   See more on stackoverflow

3. www.reddit.com › what_does_return_0_actually_doWhat does "return 0" actually do? : r/C_Programming - Reddit

   www.reddit.com › what_does_return_0_actually_do

   • Cached

   On a Unix-like system, when you return 0 from main (), the following things happen: Control returns to the program entry point, _start, which is part of the C runtime for that system. The code in _start calls exit (0), or something which has the same effect. All functions registered with atexit () are called, destructors are run.

4. retrocomputing.stackexchange.com › questions › 24961What's the origin of process return status 0 meaning success?

   retrocomputing.stackexchange.com › questions › 24961

   • Cached

   • TL;DR: CPUs Handle Zero Unique Among All integers.
   • Way Back in Time and Close to Hardware
   • And Then There Was C and Unix
   • Divide et Impera
   • Two Halves of A Shell
   • One Exit Code to Rule Them All

   Zero is set apart from any other integer by the way ALUs work. On low level it is thus of advantage to use zeroas return code for success, as it's the most easy to be detected. With that being said, it comes natural to extend this to process/program return codes.

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   Much meaning can be put in hindsight onto return codes, but such based on integers inherently benefit from integers being treated as first class member by next to all CPU architectures. This includes almost always a way for taking execution depending on an integer being zero or non zero. Either by offering a value based branch, or a fast, low cost ...

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   While (early) mainframe OS used dedicated mechanics for success and return/error information, the designers of Unix were all about simplifying to the absolute minimum. Using zero to distinguish the most notable case, yields the best performance. C/Unix was not only using the advantage of integers within programs (*2), but as well extended it to the...

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   What goes for integers works of course as well with signed integers. Those divide all none zero values in two (almost) equal sized sets, marked by the sign - a feature as easy to detect as like zeroand as well privileged by many architectures. By using signed integers Now not only reasons for being non successful, but as well reasons for success ca...

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   (*4) Despite process exit codes usually seen as unsigned integers, the sign principle got as well extended to shell use by reserving values of of 128 and above, like for the return value of a sub-process.

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   In batch programming 'success' is one most important 'message', as it's the one to be detected to carry on with whatever is next. Think of a very classic use case like processing data from a tape. Such a program may return beside the basic 1. Everything worked fine and 2. Generic fail exit codes for 1. Wrong tape, 2. No tape assigned or 3. Add foll...

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5. en.wikipedia.org › wiki › Return_to_Zero_(film)Return to Zero (film) - Wikipedia

   en.wikipedia.org › wiki › Return_to_Zero_(film)

   • Cached

   Return to Zero is based on a true story in which a successful couple named Aaron and Maggie are expecting their first child, only to have their lives devastated when they learn that the child has died in the womb. The film is based on the experiences of its writer, Sean Hanish, and his wife.

6. cs50.stackexchange.com › questions › 7347lectures - Do we need to return 0 in C? - CS50 Stack Exchange

   cs50.stackexchange.com › questions › 7347

   • Cached

   Jan 16, 2015 · From C11 standard: 5.1.2.2.3 Program termination. reaching the } that terminates the main function returns a value of 0. In earlier versions of C though, the result of not explicitly returning an int value from main caused the termination status to be undefined. Share.

7. variety.com › tv-review-return-to-zero-1201175755"Return to Zero" Lifetime movie TV Review - Variety

   variety.com › tv-review-return-to-zero-1201175755

   • Cached

   May 15, 2014 · TV Review: ‘Return to Zero’. Lifetime ’s latest acquisition, “Return to Zero,” is a painful portrait of devastating loss, pivoting on a performance by Minnie Driver that acutely captures ...

8. People also ask

   Does return 0 mean success?

   • As for your function, return what you wish and makes code more readable, as long as you keep it that way along your programs. 0 always means success, but other exit codes are also permitted to mean success depending on the system. @AndrewMarshall EXIT_SUCCESS might have some other value than 0, but even then, return 0;also means success.

   Should I return 0 or 1 for successful function? - Stack Overflow

   stackoverflow.com/questions/9549342/should-i-return-0-or-1-for-successful-function

   See all results for this question

   What happens if a main() function returns 0?

   • On these systems, the return value is ignored. With C on Unix, if your main() function returns 0, it's the same thing as if it had called exit(0). Either way, the program terminates, and the status code 0 is returned to whatever program (most likely a shell) that launched it as the exit status.

   What does "return 0" actually do? : r/C_Programming - Reddit

   www.reddit.com/r/C_Programming/comments/180q8gu/what_does_return_0_actually_do/

   See all results for this question

   What happens when you return 0 from main()?

   • On a Unix-like system, when you return 0 from main(), the following things happen: Control returns to the program entry point, _start, which is part of the C runtime for that system. The code in _start calls exit(0), or something which has the same effect. All functions registered with atexit() are called, destructors are run.

   What does "return 0" actually do? : r/C_Programming - Reddit

   www.reddit.com/r/C_Programming/comments/180q8gu/what_does_return_0_actually_do/

   See all results for this question

   Why do we use 0 for success?

   • (This is part of the description of the exit function, using the same codes.) The reason why main use 0 for success is that it is used as the exit code of the application to the operating system, where 0 typically means success and 1 (or higher) means failure. (Of course, you should always use the predefined macros EXIT_SUCCESS and EXIT_FAILURE .)

   Should I return 0 or 1 for successful function? - Stack Overflow

   stackoverflow.com/questions/9549342/should-i-return-0-or-1-for-successful-function

   See all results for this question

9. www.codeease.net › programming › c++why there is return 0 used in c | Code Ease

   www.codeease.net › programming › c++

   • Cached

   Jan 24, 2024 · A return value of 0 typically signifies that the program executed successfully without any errors. Here's a simple example: c. #include <stdio.h></p><p>int main() { // Your program logic goes here</p><p> printf("Program executed successfully!\n");</p><p> // Return 0 to indicate successful termination return 0; }