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Add check for madvise(2) to configure.ac.

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Some platforms, such as Google's Portable Native Client, use Newlib and
thus lack access to madvise(2).  In those instances, pages_purge() is
transformed into a no-op.
This commit is contained in:
Richard Diamond
2014-06-03 02:39:18 -05:00
committed by Jason Evans
parent 70807bc54b
commit 994fad9bda
3 changed files with 24 additions and 2 deletions
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7
src/chunk_mmap.c
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@@ -121,7 +121,7 @@ pages_purge(void *addr, size_t length)
#ifdef _WIN32
VirtualAlloc(addr, length, MEM_RESET, PAGE_READWRITE);
unzeroed = true;
#else
#elif defined(JEMALLOC_HAVE_MADVISE)
# ifdef JEMALLOC_PURGE_MADVISE_DONTNEED
# define JEMALLOC_MADV_PURGE MADV_DONTNEED
# define JEMALLOC_MADV_ZEROS true
@@ -129,12 +129,15 @@ pages_purge(void *addr, size_t length)
# define JEMALLOC_MADV_PURGE MADV_FREE
# define JEMALLOC_MADV_ZEROS false
# else
# error "No method defined for purging unused dirty pages."
# error "No madvise(2) flag defined for purging unused dirty pages."
# endif
int err = madvise(addr, length, JEMALLOC_MADV_PURGE);
unzeroed = (JEMALLOC_MADV_ZEROS == false || err != 0);
# undef JEMALLOC_MADV_PURGE
# undef JEMALLOC_MADV_ZEROS
#else
/* Last resort no-op. */
unzeroed = true;
#endif
return (unzeroed);
}