Replace lists with arrays to store read and write threads

Ticket : CM-6300
Reviewed by : CCR-3049
Testing : Manual

With arrays, a thread corresponding to given fd is looked up in constant time
versus the linear time taken for list traversals.

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/thread.h b/lib/thread.h
index 95008a73bc..22eb7c7120 100644
--- a/lib/thread.h
+++ b/lib/thread.h
@@ -49,13 +49,14 @@ struct pqueue;
 /* Master of the theads. */
 struct thread_master
 {
-  struct thread_list read;
-  struct thread_list write;
+  struct thread **read;
+  struct thread **write;
   struct pqueue *timer;
   struct thread_list event;
   struct thread_list ready;
   struct thread_list unuse;
   struct pqueue *background;
+  int fd_limit;
   fd_set readfd;
   fd_set writefd;
   fd_set exceptfd;