add startup and shutdown methods

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/performance/trunk@38844 72102866-910b-0410-8b05-ffd578937521

GSIOThreadPool.h

@@ -47,6 +47,16 @@ typedef unsigned int NSUInteger;
  * the date is nil or is in the past).
  */
 - (void) terminate: (NSDate*)when;
+
+/** Called when the thread is shut down (immediately before exit).<br />
+ * Does nothing, provided for subclasses to override.
+ */
+- (void) shutdown;
+
+/** Called when the thread is started up (before the run loop starts).<br />
+ * Does nothing, provided for subclasses to override.
+ */
+- (void) startup;
 @end
 
 /** This class provides a thread pool for performing methods which need to

GSIOThreadPool.m

@@ -62,6 +62,7 @@ static NSRecursiveLock   *classLock = nil;
 - (void) _finish: (NSTimer*)t
 {
   _timer = nil;
+  [self shutdown];
   [NSThread exit];
 }
 
@@ -72,6 +73,7 @@ static NSRecursiveLock   *classLock = nil;
   NSDate		*when = [NSDate distantFuture];
   NSTimeInterval	delay = [when timeIntervalSinceNow];
 
+  [self startup];
   _timer = [NSTimer scheduledTimerWithTimeInterval: delay
 					    target: self
 					  selector: @selector(_finish:)
@@ -104,6 +106,16 @@ static NSRecursiveLock   *classLock = nil;
 }
 #endif
 
+- (void) shutdown
+{
+  return;
+}
+
+- (void) startup
+{
+  return;
+}
+
 /* End execution of the thread by the specified date.
  */
 - (void) terminate: (NSDate*)when