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Implement the *allocx() API.

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Implement the *allocx() API, which is a successor to the *allocm() API.
The *allocx() functions are slightly simpler to use because they have
fewer parameters, they directly return the results of primary interest,
and mallocx()/rallocx() avoid the strict aliasing pitfall that
allocm()/rallocx() share with posix_memalign().  The following code
violates strict aliasing rules:

    foo_t *foo;
    allocm((void **)&foo, NULL, 42, 0);

whereas the following is safe:

    foo_t *foo;
    void *p;
    allocm(&p, NULL, 42, 0);
    foo = (foo_t *)p;

mallocx() does not have this problem:

    foo_t *foo = (foo_t *)mallocx(42, 0);
This commit is contained in:
Jason Evans
2013-12-12 22:35:52 -08:00
parent 0ac396a06a
commit d82a5e6a34
19 changed files with 954 additions and 365 deletions
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4
src/tcache.c
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@@ -292,7 +292,7 @@ tcache_create(arena_t *arena)
else if (size <= tcache_maxclass)
tcache = (tcache_t *)arena_malloc_large(arena, size, true);
else
tcache = (tcache_t *)icallocx(size, false, arena);
tcache = (tcache_t *)icalloct(size, false, arena);
if (tcache == NULL)
return (NULL);
@@ -366,7 +366,7 @@ tcache_destroy(tcache_t *tcache)
arena_dalloc_large(arena, chunk, tcache);
} else
idallocx(tcache, false);
idalloct(tcache, false);
}
void