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What is the preferred way of calling other processes asynchronously in D? My use case is calling svn status checking exit status, and parsing its standard output and error.
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An asynchronous method call is a method used in . NET programming that returns to the caller immediately before the completion of its processing and without blocking the calling thread.
An asynchronous process is a process or function that executes a task "in the background" without the user having to wait for the task to finish.
Sync is single-thread, so only one operation or program will run at a time. Async is non-blocking, which means it will send multiple requests to a server. Sync is blocking — it will only send the server one request at a time and will wait for that request to be answered by the server.
Synchronous RPC - Synchronous remote procedure call is a blocking call, i.e. when a client has made a request to the server, the client will wait until it receives a response from the server. Asynchronous RPC - Client makes a RPC call and it waits only for an acknowledgement from the server and not the actual response.
I think std.stdio.popen is what you want:
void popen(string command, in char[] stdioOpenmode = "r");
Use it with a File and you get the output; something like:
File f;
f.popen("svn status", "r");
char[] line;
string result;
while (f.readln(line))
result ~= line;
return result;
Or you can use std.process.shell which apparently does this for you (and throws an ErrnoException on error).
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