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unit DaemonWorkerThread;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils;
// --------------------------------------------------------------------------------
// This is the "workhorse" of the daemon, and just a normal therad, see the Lazarus
// docs about threads and mutlitasking for details.
// Execute holds the main work code of the service
// Do not try the execute method of TDaemon, since it does not multitask,
// the service thread will stop responding to control messages if looping in the
// TDaemon execute method. Thus we need a worker thread.
// --------------------------------------------------------------------------------
type
TDaemonWorkerThread = class(TThread)
private
public
procedure Execute; override; // the actual worker thread code goes here
constructor Create;
destructor Destroy; override;
end;
implementation
uses DaemonUnit;
// --------------------------------------------------------------------------
// TThread.execute: this is the core of the workhorse, the routine which does
// actually hold the service's working code
// --------------------------------------------------------------------------
procedure TDaemonWorkerThread.Execute;
var
i: integer;
begin
LogToFile('Daemon worker thread executing');
while not Terminated do
begin
// placeholder, put your actual service code here
// ...
LogToFile('Daemon worker thread running');
// Thread- and CPUload friendly 5s delay loop
for i := 1 to 50 do
begin
if Terminated then break;
Sleep(100);
end;
// ...
// ----------------------------------------
end;
LogToFile('Daemon worker thread terminated');
end;
// -------------------------------------------------
// Construction and destruction of the worker thread
// -------------------------------------------------
constructor TDaemonWorkerThread.Create;
begin
// Create a suspended worker thread to allow further parametrizon before it
// does actually start
// The thread will be started if the OS sends a "Start" Signal to TDaemon
// See OnStart event handler of the TDeamon class
inherited Create(True);
LogToFile('Daemon worker thread created');
end;
destructor TDaemonWorkerThread.Destroy;
begin
// Nothing to do here, just for logging
LogToFile('Daemon worker thread destroyed');
inherited Destroy;
end;
end.
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