Reuse of thread IDs, improved thread ID validation, new tests, bug fixes.

1 files changed, 94 insertions, 0 deletions

diff --git a/ptw32_reuse.c b/ptw32_reuse.c
new file mode 100644
index 0000000..f604d26
--- /dev/null
+++ b/ptw32_reuse.c
@@ -0,0 +1,94 @@
+/*
+ * ptw32_threadReuse.c
+ *
+ * Description:
+ * This translation unit implements miscellaneous thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *	Pthreads-win32 - POSIX Threads Library for Win32
+ *	Copyright(C) 1998 John E. Bossom
+ *	Copyright(C) 1999,2002 Pthreads-win32 contributors
+ * 
+ *	Contact Email: rpj@ise.canberra.edu.au
+ * 
+ *	The current list of contributors is contained
+ *	in the file CONTRIBUTORS included with the source
+ *	code distribution. The list can also be seen at the
+ *	following World Wide Web location:
+ *	http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation; either
+ *	version 2 of the License, or (at your option) any later version.
+ * 
+ *	This library is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	Lesser General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU Lesser General Public
+ *	License along with this library in the file COPYING.LIB;
+ *	if not, write to the Free Software Foundation, Inc.,
+ *	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+
+/*
+ * The thread reuse stack is a simple LIFO stack managed through a singly
+ * linked list element in the pthread_t struct.
+ *
+ * All thread structs on the stack are clean and ready for reuse.
+ *
+ * The pthread_t_ struct's prevReuse element can be tested to check for an invalid
+ * thread ID. A NULL value indicates a valid thread. Applications should use the
+ * pthread_kill() function with a zero signal value to test for a valid thread ID.
+ */
+
+/*
+ * Pop a clean pthread_t struct off the reuse stack.
+ */
+pthread_t
+ptw32_threadReusePop (void)
+{
+  pthread_t t;
+
+  EnterCriticalSection(&ptw32_thread_reuse_lock);
+
+  t = ptw32_threadReuseTop;
+
+  if (PTW32_THREAD_REUSE_BOTTOM != t)
+    {
+      ptw32_threadReuseTop = t->prevReuse;
+      t->prevReuse = NULL;
+    }
+  else
+    {
+      t = NULL;
+    }
+
+  LeaveCriticalSection(&ptw32_thread_reuse_lock);
+
+  return t;
+
+}
+
+/*
+ * Push a clean pthread_t struct onto the reuse stack.
+ */
+void
+ptw32_threadReusePush (pthread_t thread)
+{
+  EnterCriticalSection(&ptw32_thread_reuse_lock);
+
+  memset(thread, 0, sizeof (*thread));
+  thread->prevReuse = ptw32_threadReuseTop;
+  ptw32_threadReuseTop = thread;
+
+  LeaveCriticalSection(&ptw32_thread_reuse_lock);
+}
+