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Hunk allocation for FreeBSD

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Yamagi Burmeister 2018-10-08 22:29:35 +03:00 committed by Denis Pauk
parent 64babe9422
commit b876579d4d
1 changed files with 12 additions and 39 deletions
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51
src/backends/unix/shared/hunk.c
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@ -97,55 +97,28 @@ Hunk_End(void)
#if defined(__linux__)
n = (byte *)mremap(membase, maxhunksize, curhunksize + sizeof(size_t), 0);
#elif defined(__FreeBSD__)
size_t old_size = maxhunksize;
size_t new_size = curhunksize + sizeof(size_t);
void *unmap_base;
size_t unmap_len;
new_size = round_page(new_size);
old_size = round_page(old_size);
if (new_size > old_size)
{
n = 0; /* error */
}
else if (new_size < old_size)
{
unmap_base = (caddr_t)(membase + new_size);
unmap_len = old_size - new_size;
n = munmap(unmap_base, unmap_len) + membase;
}
#else
#ifndef round_page
#define round_page(x) (((size_t)(x) + (page_size - 1)) / page_size) * \
page_size
#define round_page(x) ((((size_t)(x)) + sysconf(_SC_PAGESIZE)) & ~(_SC_PAGESIZE))
#endif
size_t old_size = maxhunksize;
size_t new_size = curhunksize + sizeof(size_t);
void *unmap_base;
size_t unmap_len;
long page_size;
page_size = sysconf(_SC_PAGESIZE);
if (page_size == -1)
{
Sys_Error("Hunk_End: sysconf _SC_PAGESIZE failed (%d)", errno);
}
new_size = round_page(new_size);
old_size = round_page(old_size);
size_t old_size = round_page(maxhunksize);
size_t new_size = round_page(curhunksize + sizeof(size_t));
if (new_size > old_size)
{
n = 0; /* error */
/* Can never happen. If it happens something's very wrong. */
n = 0;
}
else if (new_size < old_size)
{
unmap_base = (caddr_t)(membase + new_size);
unmap_len = old_size - new_size;
n = munmap(unmap_base, unmap_len) + membase;
/* Hunk is to big, we need to shrink it. */
n = munmap(membase + new_size, old_size - new_size) + membase;
}
else
{
/* No change necessary. */
n = membase;
}
#endif