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mem: add support for ringbuffers

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Add an option to map the memory twice in contigious memory to
make it easier to deal with ringbuffers.
This commit is contained in:
Wim Taymans 2017-04-26 10:56:00 +02:00
parent edb21a0ff8
commit ed273ec465
3 changed files with 87 additions and 35 deletions
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9
pinos/client/mem.h
View file

@ -31,9 +31,10 @@ typedef struct _PinosMemblock PinosMemblock;
typedef enum {
PINOS_MEMBLOCK_FLAG_NONE = 0,
PINOS_MEMBLOCK_FLAG_WITH_FD = (1 << 0),
PINOS_MEMBLOCK_FLAG_MAP_READ = (1 << 1),
PINOS_MEMBLOCK_FLAG_MAP_WRITE = (1 << 2),
PINOS_MEMBLOCK_FLAG_SEAL = (1 << 3),
PINOS_MEMBLOCK_FLAG_SEAL = (1 << 1),
PINOS_MEMBLOCK_FLAG_MAP_READ = (1 << 2),
PINOS_MEMBLOCK_FLAG_MAP_WRITE = (1 << 3),
PINOS_MEMBLOCK_FLAG_MAP_TWICE = (1 << 4),
} PinosMemblockFlags;
#define PINOS_MEMBLOCK_FLAG_MAP_READWRITE (PINOS_MEMBLOCK_FLAG_MAP_READ | PINOS_MEMBLOCK_FLAG_MAP_WRITE)
@ -41,6 +42,7 @@ typedef enum {
struct _PinosMemblock {
PinosMemblockFlags flags;
int fd;
off_t offset;
void *ptr;
size_t size;
};
@ -48,6 +50,7 @@ struct _PinosMemblock {
SpaResult pinos_memblock_alloc (PinosMemblockFlags flags,
size_t size,
PinosMemblock *mem);
SpaResult pinos_memblock_map (PinosMemblock *mem);
void pinos_memblock_free (PinosMemblock *mem);
#ifdef __cplusplus