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Rewrite unique slot detection to be standard compliant.

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Patrick Pelissier committed 2017-03-16 00:14:14 +01:00
1 parent ba37d183a7
commit 50163118f4
1 file changed
+13 -12
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m-shared.h
+13 -12
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@@ -29,6 +29,7 @@
#include <stdbool.h>
#include <assert.h>
#include <stdatomic.h>
#include <stdint.h>
#include "m-core.h"
@@ -60,8 +61,9 @@
#define SHAREDI_PTR_DEF2(name, type, oplist) \
typedef struct M_C3(shared_, name, _s){ \
int cpt; \
type *data; \
type *data; /* Pointer to the data */ \
int cpt; /* Counter of how many points to the data */ \
bool combineAlloc; /* Does the data and the ptr share the slot? */ \
} *M_C3(shared_, name, _t)[1]; \
\
typedef struct M_C3(shared_contain_, name, _s) { \
@@ -101,8 +103,9 @@
M_MEMORY_FULL(sizeof(struct M_C3(shared_, name, _s))); \
return; \
} \
ptr->cpt = 1; \
ptr->data = data; \
ptr->cpt = 1; \
ptr->combineAlloc = false; \
*shared = ptr; \
SHAREDI_CONTRACT(shared); \
} \
@@ -120,8 +123,9 @@
struct M_C3(shared_, name, _s) *ptr = &p->ptr; \
type *data = &p->data; \
M_GET_INIT oplist(*data); \
ptr->cpt = 1; \
ptr->data = data; \
ptr->cpt = 1; \
ptr->combineAlloc = true; \
*shared = ptr; \
SHAREDI_CONTRACT(shared); \
} \
@@ -151,16 +155,13 @@
SHAREDI_CONTRACT(dest); \
if (*dest != NULL) { \
if (atomic_fetch_sub(&((*dest)->cpt), 1) == 1) { \
bool combineAlloc = (*dest)->combineAlloc; \
/* Note: if combineAlloc is true, the address of the slot \
combining both data & ptr is the same as the address of the \
first element, aka data itself. */ \
M_GET_CLEAR oplist (*(*dest)->data); \
M_GET_DEL oplist ((*dest)->data); \
/* Test if the shared pointer and the type are part of the same \
structure */ \
/* Note: Not sure it is 100% standard compliant, but I am \
pretty sure than no implementation breaks on this. */ \
if (M_TYPE_FROM_FIELD(struct M_C3(shared_contain_, name,_s), \
(*dest)->data, type, data) \
!= M_TYPE_FROM_FIELD(struct M_C3(shared_contain_, name,_s), \
*dest, struct M_C3(shared_, name, _s), ptr) ) \
if (combineAlloc == false) \
M_GET_DEL oplist (*dest); \
} \
*dest = NULL; \