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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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7
Makefile.in
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@@ -112,13 +112,16 @@ TESTS_UNIT := $(srcroot)test/unit/bitmap.c $(srcroot)test/unit/math.c \
$(srcroot)test/unit/SFMT.c $(srcroot)test/unit/tsd.c
TESTS_INTEGRATION := $(srcroot)test/integration/aligned_alloc.c \
$(srcroot)test/integration/allocated.c \
$(srcroot)test/integration/ALLOCM_ARENA.c \
$(srcroot)test/integration/mallocx.c \
$(srcroot)test/integration/mremap.c \
$(srcroot)test/integration/posix_memalign.c \
$(srcroot)test/integration/rallocx.c \
$(srcroot)test/integration/thread_arena.c \
$(srcroot)test/integration/thread_tcache_enabled.c
$(srcroot)test/integration/thread_tcache_enabled.c \
$(srcroot)test/integration/xallocx.c
ifeq ($(enable_experimental), 1)
TESTS_INTEGRATION += $(srcroot)test/integration/allocm.c \
$(srcroot)test/integration/ALLOCM_ARENA.c \
$(srcroot)test/integration/rallocm.c
endif
TESTS_STRESS :=