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#ifndef _ALLOC_C_ /* -*- linux-c -*- */
#define _ALLOC_C_
/** @file alloc.c
* @brief Memory functions.
*/
/** @addtogroup alloc Memory Functions
* Basic malloc/calloc/free functions. These will be changed so
* that memory allocation errors will call a handler. The default will
* send a signal to the user-space daemon that will trigger the module to
* be unloaded.
* @todo Need error handling for memory allocations
* @{
*/
enum errorcode { ERR_NONE=0, ERR_NO_MEM };
enum errorcode _stp_error = ERR_NONE;
/** Allocates memory within a probe.
* This is used for small allocations from within a running
* probe where the process cannot sleep.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
* @note Not currently used by the runtime. Deprecate?
*/
void *_stp_alloc(size_t len)
{
void *ptr = kmalloc(len, GFP_ATOMIC);
if (unlikely(ptr == NULL))
_stp_error = ERR_NO_MEM;
return ptr;
}
/** Allocates and clears memory within a probe.
* This is used for small allocations from within a running
* probe where the process cannot sleep.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
* @note Not currently used by the runtime. Deprecate?
*/
void *_stp_calloc(size_t len)
{
void *ptr = _stp_alloc(len);
if (likely(ptr))
memset(ptr, 0, len);
return ptr;
}
/** Allocates and clears memory outside a probe.
* This is typically used in the module initialization to
* allocate new maps, lists, etc.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
*/
void *_stp_valloc(size_t len)
{
void *ptr = vmalloc(len);
if (likely(ptr))
memset(ptr, 0, len);
else
_stp_error = ERR_NO_MEM;
return ptr;
}
/** Frees memory allocated by _stp_alloc or _stp_calloc.
* @param ptr pointer to memory to free
* @note Not currently used by the runtime. Deprecate?
*/
void _stp_free(void *ptr)
{
if (likely(ptr))
kfree(ptr);
}
/** Frees memory allocated by _stp_valloc.
* @param ptr pointer to memory to free
*/
void _stp_vfree(void *ptr)
{
if (likely(ptr))
vfree(ptr);
}
/** @} */
#endif /* _ALLOC_C_ */
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