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-rw-r--r--erts/emulator/beam/global.h84
1 files changed, 83 insertions, 1 deletions
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index 594c0ccf94..20f100b427 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -380,7 +380,7 @@ extern int bif_reductions; /* reductions + fcalls (when doing call_bif) */
extern int stackdump_on_exit;
/*
- * Here is an implementation of a lightweiht stack.
+ * Here is an implementation of a lightweight stack.
*
* Use it like this:
*
@@ -845,6 +845,88 @@ do {\
} while(0)
+/*
+ * An implementation of lightweight unbounded queues,
+ * using a circular dynamic array.
+ * It does not include support for change_allocator.
+ *
+ * Use it like this:
+ *
+ * DECLARE_EQUEUE(Queue) (At the start of a block)
+ * ...
+ * EQUEUE_PUT(Queue, Term)
+ * ...
+ * if (EQUEUE_ISEMPTY(Queue)) {
+ * Queue is empty
+ * } else {
+ * Term = EQUEUE_GET(Stack);
+ * Process popped Term here
+ * }
+ * ...
+ * DESTROY_EQUEUE(Queue)
+ */
+
+typedef struct {
+ Eterm* start;
+ Eterm* front;
+ Eterm* back;
+ int possibly_empty;
+ Eterm* end;
+ ErtsAlcType_t alloc_type;
+}ErtsEQueue;
+
+#define DEF_EQUEUE_SIZE (16)
+
+void erl_grow_equeue(ErtsEQueue*, Eterm* def_queue);
+#define EQUE_CONCAT(a,b) a##b
+#define EQUE_DEF_QUEUE(q) EQUE_CONCAT(q,_default_equeue)
+
+#define DECLARE_EQUEUE(q) \
+ UWord EQUE_DEF_QUEUE(q)[DEF_EQUEUE_SIZE]; \
+ ErtsEQueue q = { \
+ EQUE_DEF_QUEUE(q), /* start */ \
+ EQUE_DEF_QUEUE(q), /* front */ \
+ EQUE_DEF_QUEUE(q), /* back */ \
+ 1, /* possibly_empty */ \
+ EQUE_DEF_QUEUE(q) + DEF_EQUEUE_SIZE, /* end */ \
+ ERTS_ALC_T_ESTACK /* alloc_type */ \
+ }
+
+#define DESTROY_EQUEUE(q) \
+do { \
+ if (q.start != EQUE_DEF_QUEUE(q)) { \
+ erts_free(q.alloc_type, q.start); \
+ } \
+} while(0)
+
+#define EQUEUE_PUT_UNCHECKED(q, x) \
+do { \
+ q.possibly_empty = 0; \
+ *(q.back) = (x); \
+ if (++(q.back) == q.end) { \
+ q.back = q.start; \
+ } \
+} while(0)
+
+#define EQUEUE_PUT(q, x) \
+do { \
+ if (q.back == q.front && !q.possibly_empty) { \
+ erl_grow_equeue(&q, EQUE_DEF_QUEUE(q)); \
+ } \
+ EQUEUE_PUT_UNCHECKED(q, x); \
+} while(0)
+
+#define EQUEUE_ISEMPTY(q) (q.back == q.front && q.possibly_empty)
+
+#define EQUEUE_GET(q) ({ \
+ q.possibly_empty = 1; \
+ UWord x = *(q.front); \
+ if (++(q.front) == q.end) { \
+ q.front = q.start; \
+ } \
+ x; \
+})
+
/* binary.c */
void erts_emasculate_writable_binary(ProcBin* pb);