qsbr: portability fixes: use unsigned long for the gp counters.

[urcu.git] / urcu-qsbr-static.h

diff --git a/urcu-qsbr-static.h b/urcu-qsbr-static.h
index 8d8aa3f8f60519620dbcfb78aef1b007c6183e5c..3d2ec8f3af5b046c9ca66c3b24e4e77aa762d358 100644 (file)
--- a/urcu-qsbr-static.h
+++ b/urcu-qsbr-static.h
@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <pthread.h>
 #include <assert.h>
+#include <limits.h>
 
 #include <compiler.h>
 #include <arch.h>
@@ -165,18 +166,18 @@ static inline void reader_barrier()
  * Using a int rather than a char to eliminate false register dependencies
  * causing stalls on some architectures.
  */
-extern long urcu_gp_ctr;
+extern unsigned long urcu_gp_ctr;
 
-extern long __thread rcu_reader_qs_gp;
+extern unsigned long __thread rcu_reader_qs_gp;
 
-static inline int rcu_gp_ongoing(long *value)
+static inline int rcu_gp_ongoing(unsigned long *value)
 {
-       long reader_gp;
+       unsigned long reader_gp;
 
        if (value == NULL)
                return 0;
        reader_gp = LOAD_SHARED(*value);
-       return reader_gp && (reader_gp - urcu_gp_ctr < 0);
+       return reader_gp && (reader_gp - urcu_gp_ctr > ULONG_MAX / 2);
 }
 
 static inline void _rcu_read_lock(void)