1 files changed, 61 insertions, 0 deletions
diff --git a/linuxthreads/queue.h b/linuxthreads/queue.h
new file mode 100644
index 0000000000..28bd75531c
--- /dev/null
+++ b/linuxthreads/queue.h
@@ -0,0 +1,61 @@
+/* Linuxthreads - a simple clone()-based implementation of Posix        */
+/* threads for Linux.                                                   */
+/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
+/*                                                                      */
+/* This program is free software; you can redistribute it and/or        */
+/* modify it under the terms of the GNU Library General Public License  */
+/* as published by the Free Software Foundation; either version 2       */
+/* of the License, or (at your option) any later version.               */
+/*                                                                      */
+/* This program 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 Library General Public License for more details.                 */
+
+/* Waiting queues */
+
+/* Waiting queues are represented by lists of thread descriptors
+   linked through their p_nextwaiting field.  The lists are kept
+   sorted by decreasing priority, and then decreasing waiting time. */
+
+static inline void enqueue(pthread_descr * q, pthread_descr th)
+{
+  int prio = th->p_priority;
+  ASSERT(th->p_nextwaiting == NULL);
+  for (; *q != NULL; q = &((*q)->p_nextwaiting)) {
+    if (prio > (*q)->p_priority) {
+      th->p_nextwaiting = *q;
+      *q = th;
+      return;
+    }
+  }
+  *q = th;
+}
+
+static inline pthread_descr dequeue(pthread_descr * q)
+{
+  pthread_descr th;
+  th = *q;
+  if (th != NULL) {
+    *q = th->p_nextwaiting;
+    th->p_nextwaiting = NULL;
+  }
+  return th;
+}
+
+static inline int remove_from_queue(pthread_descr * q, pthread_descr th)
+{
+  for (; *q != NULL; q = &((*q)->p_nextwaiting)) {
+    if (*q == th) {
+      *q = th->p_nextwaiting;
+      th->p_nextwaiting = NULL;
+      return 1;
+    }
+  }
+  return 0;
+}
+
+static inline int queue_is_empty(pthread_descr * q)
+{
+    return *q == NULL;
+}