X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=seqlock%2Fseqlock.h;h=73e471f350618e6310e9eb8cea8e942a0802c0ea;hb=d634d19b6134309ed0893c6fd58d815cbafecd16;hp=c5a965cb8243bbb191ebe0620a72bdc50c0e4105;hpb=f8c46d903b303b81ef0d25cb8495de22d299466b;p=model-checker-benchmarks.git

diff --git a/seqlock/seqlock.h b/seqlock/seqlock.h
index c5a965c..73e471f 100644
--- a/seqlock/seqlock.h
+++ b/seqlock/seqlock.h
@@ -1,5 +1,6 @@
 #include <stdatomic.h>
 #include <threads.h>
+#include "common.h"
 
 typedef struct seqlock {
 	// Sequence for reader consistency check
@@ -25,14 +26,16 @@ typedef struct seqlock {
 	}
 	
 	void write(int new_data) {
-		int old_seq = _seq.load(memory_order_acquire); // acquire
 		while (true) {
+			// #1: either here or #2 must be acquire
+			int old_seq = _seq.load(memory_order_acquire); // acquire
 			// This might be a relaxed too
 			if (old_seq % 2 == 1)
 				continue; // Retry
 
+			// #2
 			if (_seq.compare_exchange_strong(old_seq, old_seq + 1,
-				memory_order_acq_rel, memory_order_acquire)) 
+				memory_order_relaxed, memory_order_relaxed)) 
 				break;
 		}