Add function to query pool capacity.

2 files changed, 9 insertions, 0 deletions

diff --git a/mempool/include/mempool.h b/mempool/include/mempool.h
index b76ae7c..8251a70 100644
--- a/mempool/include/mempool.h
+++ b/mempool/include/mempool.h
@@ -80,6 +80,9 @@
 #define mempool_get_block_index(POOL, BLOCK_PTR) \
   mempool_get_block_index_(&(POOL)->pool, BLOCK_PTR)
 
+/// Return the total capacity of the mempool in bytes.
+#define mempool_capacity(POOL) mempool_capacity_(&(POOL)->pool)
+
 /// Iterate over the used blocks of the pool.
 ///
 /// The caller can use 'i' as the index of the current block.
@@ -133,3 +136,4 @@ void*  mempool_alloc_(mempool*);
 void   mempool_free_(mempool*, void** block_ptr);
 void*  mempool_get_block_(const mempool*, size_t block_index);
 size_t mempool_get_block_index_(const mempool*, const void* block);
+size_t mempool_capacity_(const mempool*);
diff --git a/mempool/src/mempool.c b/mempool/src/mempool.c
index fdb5f8c..679f124 100644
--- a/mempool/src/mempool.c
+++ b/mempool/src/mempool.c
@@ -124,3 +124,8 @@ size_t mempool_get_block_index_(const mempool* pool, const void* block) {
   assert(block_byte_index % pool->block_size_bytes == 0);
   return block_byte_index / pool->block_size_bytes;
 }
+
+size_t mempool_capacity_(const mempool* pool) {
+  assert(pool);
+  return pool->num_blocks * pool->block_size_bytes;
+}