TThread提供了几种同步的方法：
TThread = class
protected
procedure Synchronize(Method: TThreadMethod); overload; // 在继承中调用同步
public
class procedure Synchronize(AThread: TThread; AMethod: TThreadMethod); overload;
class procedure StaticSynchronize(AThread: TThread; AMethod: TThreadMethod);
end;
OnTerminate事件是线程安全的。
TServerSocket
当TServerSocket的ＳerverType设置为stThreadBlocking方式时，要注意
OnAccept: 线程安全
OnGetThread: 线程安全
OnThreadStart : 线程不安全
OnThreadEnd : 线程不安全
OnClientConnect: 线程不安全（好象没被调用）
OnClientDisconnect: 线程不安全
OnClientRead: 线程安全
OnClientWrite: 线程安全
OnClientError: 线程不安全
参考代码：
procedure TServerClientThread.Execute;
begin
FServerSocket.ThreadStart(Self);
try
try
while True do
begin
if StartConnect then ClientExecute;
if EndConnect then Break;
end;
except
HandleException;
KeepInCache := False;
end;
finally
FServerSocket.ThreadEnd(Self);
end;
end;
procedure TServerClientThread.ClientExecute;
var
FDSet: TFDSet;
TimeVal: TTimeVal;
begin
while not Terminated and ClientSocket.Connected do
begin
FD_ZERO(FDSet);
FD_SET(ClientSocket.SocketHandle, FDSet);
TimeVal.tv_sec := 0;
TimeVal.tv_usec := 500;
if (select(0, @FDSet, nil, nil, @TimeVal) > 0) and not Terminated then
if ClientSocket.ReceiveBuf(FDSet, -1) = 0 then Break
else Synchronize(DoRead);
if (select(0, nil, @FDSet, nil, @TimeVal) > 0) and not Terminated then
Synchronize(DoWrite);
end;
end;