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-rw-r--r--commit-slab-decl.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/commit-slab-decl.h b/commit-slab-decl.h
new file mode 100644
index 0000000000..adc7b46c83
--- /dev/null
+++ b/commit-slab-decl.h
@@ -0,0 +1,43 @@
+#ifndef COMMIT_SLAB_HDR_H
+#define COMMIT_SLAB_HDR_H
+
+/* allocate ~512kB at once, allowing for malloc overhead */
+#ifndef COMMIT_SLAB_SIZE
+#define COMMIT_SLAB_SIZE (512*1024-32)
+#endif
+
+#define declare_commit_slab(slabname, elemtype) \
+ \
+struct slabname { \
+ unsigned slab_size; \
+ unsigned stride; \
+ unsigned slab_count; \
+ elemtype **slab; \
+}
+
+/*
+ * 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 \
+}
+
+#define declare_commit_slab_prototypes(slabname, elemtype) \
+ \
+void init_ ##slabname## _with_stride(struct slabname *s, unsigned stride); \
+void init_ ##slabname(struct slabname *s); \
+void clear_ ##slabname(struct slabname *s); \
+elemtype *slabname## _at_peek(struct slabname *s, const struct commit *c, int add_if_missing); \
+elemtype *slabname## _at(struct slabname *s, const struct commit *c); \
+elemtype *slabname## _peek(struct slabname *s, const struct commit *c)
+
+#define define_shared_commit_slab(slabname, elemtype) \
+ declare_commit_slab(slabname, elemtype); \
+ declare_commit_slab_prototypes(slabname, elemtype)
+
+#endif /* COMMIT_SLAB_HDR_H */