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Detect if 8-bit atomics are available.

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In some rare cases (older compiler, e.g. gcc 4.2 w/ MIPS), 8-bit atomics might
be unavailable.  Detect such cases so that we can workaround.
This commit is contained in:
Qi Wang
2019-03-07 15:58:26 -08:00
committed by Qi Wang
parent 14d3686c9f
commit 06f0850427
3 changed files with 39 additions and 0 deletions
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7
include/jemalloc/internal/atomic.h
View File

@@ -3,10 +3,17 @@
#define ATOMIC_INLINE JEMALLOC_ALWAYS_INLINE
#define JEMALLOC_U8_ATOMICS
#if defined(JEMALLOC_GCC_ATOMIC_ATOMICS)
# include "jemalloc/internal/atomic_gcc_atomic.h"
# if !defined(JEMALLOC_GCC_U8_ATOMIC_ATOMICS)
# undef JEMALLOC_U8_ATOMICS
# endif
#elif defined(JEMALLOC_GCC_SYNC_ATOMICS)
# include "jemalloc/internal/atomic_gcc_sync.h"
# if !defined(JEMALLOC_GCC_U8_SYNC_ATOMICS)
# undef JEMALLOC_U8_ATOMICS
# endif
#elif defined(_MSC_VER)
# include "jemalloc/internal/atomic_msvc.h"
#elif defined(JEMALLOC_C11_ATOMICS)

7
include/jemalloc/internal/jemalloc_internal_defs.h.in
View File

@@ -48,9 +48,16 @@
/* Defined if GCC __atomic atomics are available. */
#undef JEMALLOC_GCC_ATOMIC_ATOMICS
/* and the 8-bit variant support. */
#undef JEMALLOC_GCC_U8_ATOMIC_ATOMICS
/* Defined if GCC __sync atomics are available. */
#undef JEMALLOC_GCC_SYNC_ATOMICS
/* and the 8-bit variant support. */
#undef JEMALLOC_GCC_U8_SYNC_ATOMICS
/* Defined if 8-bit atomics are supported. */
/*
* Defined if __builtin_clz() and __builtin_clzl() are available.