[fpc-pascal]A couple of things:
Michael Van Canneyt
michael.vancanneyt at wisa.be
Tue Oct 31 17:19:26 CET 2000
On Tue, 31 Oct 2000, md wrote:
> A concepts I cannot resolve:
> Is there any way to have one process execute another totally different
> process without having
> to wait for the spawned process to terminate before continuing on?
On which system ? Linux ?
> Exec( ) style functions will create a child and wait for the child to
> terminate before
> continuing execution. What I am looking to do is to create a completely
> different process
> and have the Exec( ) function return as soon as the new process is
> started, not when it terminates.
-> The linux unit execXXX() and fork functions do exactly this:
if ID=0 then
// Parent continues execution.
WaitPID(ID, at ExitStatus,WNOHANG);
Have a look at the examples in the docu of the linux unit.
> One idea is to have the child process daemonize itself so that it spawns
> its own child. The daemonized process
> will then return to the orignal parent, thus allowing it to continue
> I am looking for nothing shared between the original process and the
> spawned process. Even the child executable
> is actually a separately compiled program.
A similar system is possible on Windows.
Have a look at the TProcess implementation on the FCL (unit process) it
allows to do this and much more in a platform-independent way.
More information about the fpc-pascal