[PATCH 15/17] commit-slab: provide a static initializer

From: Jeff King <peff@peff.net>
Date: Jun 10, 2014, 21:42 UTC
Message-ID: <20140610214251.GO19147@sigill.intra.peff.net>
In-Reply-To: <20140610213509.GA26979@sigill.intra.peff.net>

Callers currently must use init_foo_slab() at runtime before accessing a slab. For global slabs, it's much nicer if we can initialize them in BSS, so that each user does not have to add code to check-and-initialize.

Signed-off-by: Jeff King <peff@peff.net>
---
There was no comment on this one in v1. I'd be curious if anyone has
comments on what I wrote in:

  http://article.gmane.org/gmane.comp.version-control.git/251099

 commit-slab.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/commit-slab.h b/commit-slab.h
index cc114b5..375c9c7 100644
--- a/commit-slab.h
+++ b/commit-slab.h
@@ -117,4 +117,16 @@ static int stat_ ##slabname## realloc
  * catch because GCC silently parses it by default.
  */
 
+/*
+ * Statically initialize a commit slab named "var". Note that this
+ * evaluates "stride" multiple times! Example:
+ *
+ *   struct indegree indegrees = COMMIT_SLAB_INIT(1, indegrees);
+ *
+ */
+#define COMMIT_SLAB_INIT(stride, var) { \
+	COMMIT_SLAB_SIZE / sizeof(**((var).slab)) / (stride), \
+	(stride), 0, NULL \
+}
+
 #endif /* COMMIT_SLAB_H */

-- 
2.0.0.729.g520999f