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Introducing 'try to give memory back' callback for heap allocator to use upon allocation request that can not be satisfied by the allocator.

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This commit is contained in:
Ruben Ayrapetyan
2014-12-18 21:20:28 +03:00
parent 8febd2bae8
commit 6bb39bb8ea
14 changed files with 308 additions and 105 deletions
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src/liballocator/mem-allocator.h
+25
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@@ -43,12 +43,37 @@
*/
#define MEM_COMPRESSED_POINTER_WIDTH (MEM_HEAP_OFFSET_LOG - MEM_ALIGNMENT_LOG)
/**
* Severity of a 'try give memory back' request
*
* The request are posted sequentially beginning from
* low to critical until enough memory is freed.
*
* If not enough memory is freed upon a critical request
* then the engine is shut down with ERR_OUT_OF_MEMORY.
*/
typedef enum
{
MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_LOW, /* 'low' severity */
MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_MEDIUM, /* 'medium' severity */
MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_HIGH, /* 'high' severity */
MEM_TRY_GIVE_MEMORY_BACK_SEVERITY_CRITICAL /* 'critical' severity */
} mem_try_give_memory_back_severity_t;
/**
* A 'try give memory back' callback routine type.
*/
typedef void (*mem_try_give_memory_back_callback_t) (mem_try_give_memory_back_severity_t);
extern void mem_init (void);
extern void mem_finalize (bool is_show_mem_stats);
extern uintptr_t mem_compress_pointer (void *pointer);
extern void* mem_decompress_pointer (uintptr_t compressed_pointer);
extern void mem_register_a_try_give_memory_back_callback (mem_try_give_memory_back_callback_t callback);
extern void mem_unregister_a_try_give_memory_back_callback (mem_try_give_memory_back_callback_t callback);
#ifndef JERRY_NDEBUG
extern bool mem_is_heap_pointer (void *pointer);
#endif /* !JERRY_NDEBUG */