From 217d1529c1a126054fbdb9e071cd103194fd499e Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Wed, 3 Feb 2010 18:40:10 +0000
Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1564
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 os/kernel/include/memcore.h |  1 +
 os/kernel/src/chmemcore.c   | 30 +++++++++++++++++++-----------
 os/kernel/src/chregistry.c  |  2 ++
 3 files changed, 22 insertions(+), 11 deletions(-)

(limited to 'os')

diff --git a/os/kernel/include/memcore.h b/os/kernel/include/memcore.h
index 7c11e03c3..d9675f1db 100644
--- a/os/kernel/include/memcore.h
+++ b/os/kernel/include/memcore.h
@@ -64,6 +64,7 @@ extern "C" {
   void core_init(void);
   void *chCoreAlloc(size_t size);
   void *chCoreAllocI(size_t size);
+  size_t chCoreFree(void);
 #ifdef __cplusplus
 }
 #endif
diff --git a/os/kernel/src/chmemcore.c b/os/kernel/src/chmemcore.c
index 65962bde1..6cf42788b 100644
--- a/os/kernel/src/chmemcore.c
+++ b/os/kernel/src/chmemcore.c
@@ -32,9 +32,8 @@ static uint8_t *nextmem;
 static uint8_t *endmem;
 
 /**
- * @brief Low level memory manager initialization.
- *
- * @note Internal use only.
+ * @brief   Low level memory manager initialization.
+ * @note    Internal use only.
  */
 void core_init(void) {
 #if CH_MEMCORE_SIZE == 0
@@ -50,15 +49,15 @@ void core_init(void) {
 }
 
 /**
- * @brief Allocates a memory block.
+ * @brief   Allocates a memory block.
  * @details The size of the returned block is aligned to the alignment
  *          type @p align_t so it is not possible to allocate less than
  *          <code>sizeof(align_t)</code>.
  *
  *
- * @param[in] size the size of the block to be allocated
- * @return A pointer to the allocated memory block.
- * @retval NULL allocation failed, core memory exhausted.
+ * @param[in] size  the size of the block to be allocated
+ * @return  A pointer to the allocated memory block.
+ * @retval  NULL allocation failed, core memory exhausted.
  */
 void *chCoreAlloc(size_t size) {
   void *p;
@@ -70,14 +69,14 @@ void *chCoreAlloc(size_t size) {
 }
 
 /**
- * @brief Allocates a memory block.
+ * @brief   Allocates a memory block.
  * @details The size of the returned block is aligned to the alignment
  *          type @p align_t so it is not possible to allocate less than
  *          <code>sizeof(align_t)</code>.
  *
- * @param[in] size the size of the block to be allocated.
- * @return A pointer to the allocated memory block.
- * @retval NULL allocation failed, core memory exhausted.
+ * @param[in] size  the size of the block to be allocated.
+ * @return  A pointer to the allocated memory block.
+ * @retval  NULL allocation failed, core memory exhausted.
  */
 void *chCoreAllocI(size_t size) {
   void *p;
@@ -90,6 +89,15 @@ void *chCoreAllocI(size_t size) {
   return p;
 }
 
+/**
+ * @brief   Core memory left.
+ *
+ * @return  The size, in bytes, of the free core memory.
+ */
+size_t chCoreFree(void) {
+
+  return (size_t)(endmem - nextmem);
+}
 #endif /* CH_USE_MEMCORE */
 
 /** @} */
diff --git a/os/kernel/src/chregistry.c b/os/kernel/src/chregistry.c
index 186d97e35..b02d5f1fb 100644
--- a/os/kernel/src/chregistry.c
+++ b/os/kernel/src/chregistry.c
@@ -33,6 +33,8 @@
  *          the main thread unless it terminated.
  * @note    A reference is added to the returned thread in order to make sure
  *          it status is not lost.
+ * @note    This function cannot return @p NULL because there is always at
+ *          least one thread in the system.
  *
  * @return  A reference to the first thread.
  */
-- 
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