hacks for old system

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/performance/trunk@32446 72102866-910b-0410-8b05-ffd578937521

GSIOThreadPool.h

@@ -36,7 +36,10 @@ typedef unsigned int NSUInteger;
  * Operations are performed on these threads using the standard
  * -performSelector:onThread:withObject:waitUntilDone: method ... the
  * pool is simply used to keep track of allocation of threads so that
- * you can share jobs between them.
+ * you can share jobs between them.<br />
+ * NB. The threading API in OSX 10.4 and earlier is incapable of supporting
+ * this functionality ... in that case this class cannot be instantiated
+ * and initialised.
  */
 @interface	GSIOThreadPool : NSObject
 {
@@ -54,7 +57,7 @@ typedef unsigned int NSUInteger;
  */
 + (GSIOThreadPool*) sharedPool;
 
-/** Seects a thread from the pool to be used for some job.
+/** Selects a thread from the pool to be used for some job.
  */
 - (NSThread*) acquireThread;
 
@@ -68,7 +71,7 @@ typedef unsigned int NSUInteger;
 
 /** Specify the maximum number of threads in the pool (the actual number
  * used may be lower than this value).<br />
- * Default is 2.<br />
+ * Default is 0 (no thread pooling in use).<br />
  * The pool creates threads on demand up to the specified limit (or a lower
  * limit if dictated by system resources) but will not destroy idle threads
  * unless the limit is subsequently lowered.<br />

GSIOThreadPool.m

@@ -50,6 +50,7 @@
   [NSThread exit];
 }
 
+#if defined(GNUSTEP) || (MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_4)
 - (id) init
 {
   self = [super initWithTarget: self selector: @selector(run) object: nil];
@@ -59,6 +60,7 @@
     }
   return self;
 }
+#endif
 
 /* Run the thread's main runloop until terminated.
  */
@@ -170,6 +172,7 @@ best(NSMutableArray *a)
 
 - (void) dealloc
 {
+#if defined(GNUSTEP) || (MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_4)
   GSIOThread	*thread;
   NSDate	*when = [NSDate dateWithTimeIntervalSinceNow: timeout];
 
@@ -185,16 +188,23 @@ best(NSMutableArray *a)
   [threads release];
   [poolLock unlock];
   [poolLock release];
+#endif
   [super dealloc];
 }
 
 - (id) init
 {
+#if defined(GNUSTEP) || (MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_4)
   if ((self = [super init]) != nil)
     {
       poolLock = [NSLock new];
       threads = [NSMutableArray new];
     }
+#else
+  [self release];
+  NSLog(@"WARNING, your OSX system is too old to use GSIOthreadPool");
+  return nil;
+#endif
   return self;
 }