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6501 :: Run process in parallel of the parent program

• dev1lroot (orginal) [2020-06-28T06:00:08+02:00] view original

  I tried for something like this:

  import system, os, osproc, threadpool
  import locks
  
  var
    thr1: Thread[string]
    thr2: Thread[string]
    L: Lock
  
  proc threadExec(p: string) {.thread.} =
    discard execProcess(p)
  proc threadQuit {.thread.} =
    os.sleep(1000)
    quit(1)
  
  initLock(L)
  createThread(thr1, threadExec, (paramStr(1)))
  createThread(thr2, threadQuit)
  joinThreads(thr1,thr2)
  quit(1)
  Run

  To immediately stop parent process after child process execution but, without responce from childside. So is' there an example of how to implement it correctly, not like a thread, just mb it's already implemented option.

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• shirleyquirk (orginal) [2020-07-13T03:46:11+02:00] view original

  i think you might want to execlp() it's an os system call: your program gets replaced by whatever other program you just called. not sure how cross-platform it is, or whether it's in os.nim

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• shirleyquirk (orginal) [2020-07-13T05:00:58+02:00] view original

  import system,rdstdin,strutils,sequtils proc execvp*(file:cstring,args:cstringArray):cint{.header: "<unistd.h>", importc.} proc fork*():cint{.header: "<unistd.h>", importc.} let input = readLinefromstdin("enter command:>").split(' ').allocCStringArray()#does not do quote handling! let pid = fork() if pid==0: echo("child calling: " & $cStringArraytoSeq(input)) let ret = execvp(input[0],input) assert(false)#unreachable deallocCStringArray(input) echo ("parent process quitting")

  Run

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