X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=moebius2.git;a=blobdiff_plain;f=parallel.h;h=77025e512202f9a5323146e30abc3ce141bc6d55;hp=19616e43f64b9aeba95b4dc21e973ec571eab7a9;hb=0fdb5046fb643441d6b4077e728769b92a89953e;hpb=e7355cdc61d082bc1d25a4d460736680e8d1dba2

diff --git a/parallel.h b/parallel.h
index 19616e4..77025e5 100644
--- a/parallel.h
+++ b/parallel.h
@@ -14,11 +14,11 @@
 /* used anamorphically: section, nsections */
 
 #define OUTER_PERSECTION_BASE(zero,n, sect) \
-  ((zero) + sect * (((n)-(zero) + NSECTIONS-1) / NSECTIONS))
-#define OUTER(v,zero,n, precomp)					  \
-  for ((v)= OUTER_PERSECTION_BASE((zero),(n), section);			  \
-       precomp,								  \
-       (v) < OUTER_PERSECTION_BASE((zero),(n), section + 1) && (v) < (n); \
+  ((zero) + (sect) * (((n)-(zero) + NSECTIONS-1) / NSECTIONS))
+#define OUTER(v,zero,n, precomp)					\
+  for ((v)= OUTER_PERSECTION_BASE((zero),(n), (section));	 	\
+       precomp,								\
+       (v) < OUTER_PERSECTION_BASE((zero),(n), (section) + 1) && (v) < (n); \
        (v)++)
 
 /*
@@ -29,7 +29,7 @@
  *   - function must not modify anything other than
  *      its return value (for cost computation functions, COST()) or
  *      its designated output (for precomputation functions, PRECOMP())
- *        (which latter it may not read)
+ *       and in the latter case it may not read other parts of its output
  *   - function must of course be reentrant
  */
 
@@ -49,6 +49,9 @@ void inparallel(const struct Vertices *vertices,
    * secdatasz, passed as secdata, uninitialised on entry.
    * After all the copies have finished, `combine' is invoked
    * nsections times sequentially, with the same sets of arguments.
+   * inparallel is NOT itself reentrant.
    */
 
+void inparallel_barrier(void);
+
 #endif /*PARALLEL_H*/