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libwine: Better memory reservation algorithm for platforms that use try_mmap_fixed.

This commit is contained in:
Alexandre Julliard 2006-06-20 19:07:03 +02:00
parent 40bbcfb0a1
commit 0e2fcd4ba8
1 changed files with 26 additions and 3 deletions
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29
libs/wine/mmap.c
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@ -229,7 +229,7 @@ static inline int mmap_reserve( void *addr, size_t size )
#ifdef MAP_TRYFIXED
flags |= MAP_TRYFIXED;
#elif defined(__svr4__) || defined(__NetBSD__) || defined(__APPLE__)
#elif defined(__APPLE__)
return try_mmap_fixed( addr, size, PROT_NONE, flags, get_fdzero(), 0 );
#endif
ptr = mmap( addr, size, PROT_NONE, flags, get_fdzero(), 0 );
@ -242,12 +242,34 @@ static inline int mmap_reserve( void *addr, size_t size )
* reserve_area
*
* Reserve as much memory as possible in the given area.
* FIXME: probably needs a different algorithm for Solaris
*/
static void reserve_area( void *addr, void *end )
{
size_t size = (char *)end - (char *)addr;
#if (defined(__svr4__) || defined(__NetBSD__)) && !defined(MAP_TRYFIXED)
/* try_mmap_fixed is inefficient when using vfork, so we need a different algorithm here */
/* we assume no other thread is running at this point */
size_t i, pagesize = getpagesize();
char vec;
while (size)
{
for (i = 0; i < size; i += pagesize)
if (mincore( (caddr_t)addr + i, pagesize, &vec ) != -1) break;
i &= ~granularity_mask;
if (i && mmap( addr, i, PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
get_fdzero(), 0 ) != (void *)-1)
wine_mmap_add_reserved_area( addr, i );
i += granularity_mask + 1;
if ((char *)addr + i < (char *)addr) break; /* overflow */
addr = (char *)addr + i;
if (addr >= end) break;
size = (char *)end - (char *)addr;
}
#else
if (!size) return;
if (mmap_reserve( addr, size ))
@ -261,6 +283,7 @@ static void reserve_area( void *addr, void *end )
reserve_area( addr, (char *)addr + new_size );
reserve_area( (char *)addr + new_size, end );
}
#endif
}
@ -298,7 +321,7 @@ void mmap_init(void)
#if defined(__i386__) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) /* commented out until FreeBSD gets fixed */
char stack;
char * const stack_ptr = &stack;
char *user_space_limit = (char *)0x80000000;
char *user_space_limit = (char *)0x7ffe0000;
/* check for a reserved area starting at the user space limit */
/* to avoid wasting time trying to allocate it again */