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-rw-r--r--erts/emulator/beam/utils.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index c3735683bb..184477c36b 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -258,6 +258,31 @@ erl_grow_pstack(ErtsPStack* s, void* default_pstack, unsigned need_bytes)
s->psp = s->pstart + sp_offs;
}
+/*
+ * Helper function for the EQUEUE macros defined in global.h.
+ */
+
+void
+erl_grow_equeue(ErtsEQueue* q, Eterm* default_equeue)
+{
+ Uint old_size = (q->end - q->start);
+ Uint new_size = old_size * 2;
+ Uint first_part = (q->end - q->front);
+ Uint second_part = (q->back - q->start);
+ Eterm* new_ptr = erts_alloc(q->alloc_type, new_size*sizeof(Eterm));
+ ASSERT(q->back == q->front); // of course the queue is full now!
+ if (first_part > 0)
+ sys_memcpy(new_ptr, q->front, first_part*sizeof(Eterm));
+ if (second_part > 0)
+ sys_memcpy(new_ptr+first_part, q->start, second_part*sizeof(Eterm));
+ if (q->start != default_equeue)
+ erts_free(q->alloc_type, q->start);
+ q->start = new_ptr;
+ q->end = q->start + new_size;
+ q->front = q->start;
+ q->back = q->start + old_size;
+}
+
/* CTYPE macros */
#define LATIN1