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mem: add mmap helper

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Add function and structure to help with mmap and mlock
This commit is contained in:
Wim Taymans 2017-12-01 12:40:32 +01:00
parent 3a9070ee10
commit ccd19f1e49
2 changed files with 21 additions and 1 deletions
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3
spa/include/spa/utils/defs.h
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@ -118,7 +118,8 @@ struct spa_fraction {
#define SPA_DEPRECATED #define SPA_DEPRECATED
#endif #endif
#define SPA_ROUND_UP_N(num,align) ((((num) + ((align) - 1)) & ~((align) - 1))) #define SPA_ROUND_DOWN_N(num,align) ((num) & ~((align) - 1))
#define SPA_ROUND_UP_N(num,align) SPA_ROUND_DOWN_N((num) + ((align) - 1),align)
#ifndef SPA_LIKELY #ifndef SPA_LIKELY
#ifdef __GNUC__ #ifdef __GNUC__

19
src/pipewire/mem.h
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@ -65,6 +65,25 @@ pw_memblock_free(struct pw_memblock *mem);
/** Find memblock for given \a ptr */ /** Find memblock for given \a ptr */
struct pw_memblock * pw_memblock_find(const void *ptr); struct pw_memblock * pw_memblock_find(const void *ptr);
/** parameters to map a memory range */
struct pw_map_range {
uint32_t start; /** offset in first page with start of data */
uint32_t offset; /** page aligned offset to map */
uint32_t size; /** size to map */
};
/** Calculate parameters to mmap() memory into \a range so that
* \a size bytes at \a offset can be mapped with mmap(). */
static inline void pw_map_range_init(struct pw_map_range *range,
uint32_t offset, uint32_t size,
uint32_t page_size)
{
range->offset = SPA_ROUND_DOWN_N(offset, page_size);
range->start = offset - range->offset;
range->size = offset + size - range->offset;
}
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif