threads: introduce THREAD_ID_T_NONE

Represents a kind of 'NULL' thread, but for integer IDs.

diff --git a/threads.h b/threads.h
index b973224d7a3d1e436de2d1b7dc20673b813916b6..9787c3fb9514fdf4eee5c84503f1aedcb0e2ad31 100644 (file)
--- a/threads.h
+++ b/threads.h
@@ -5,6 +5,8 @@
 
 #include "libthreads.h"
 
+#define THREAD_ID_T_NONE       -1
+
 typedef enum thread_state {
        THREAD_CREATED,
        THREAD_RUNNING,

diff --git a/tree.h b/tree.h
index 6d37038e87a42f0c068d6d1e4107ad2b983c9230..676cbe4608923b12de245b947c142a64727bf26c 100644 (file)
--- a/tree.h
+++ b/tree.h
@@ -3,7 +3,7 @@
 #include "threads.h"
 
 typedef thread_id_t tree_t;
-#define TREE_T_NONE    -1
+#define TREE_T_NONE    THREAD_ID_T_NONE
 
 /*
  * An n-ary tree