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(allocate_stack): If MULTI_PAGE_ALIASING is defined and the size of the stack which must be allocated is a multiple, allocate one more page.

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Ulrich Drepper 2003-03-14 06:11:06 +00:00
parent 3be9dc8e14
commit 59b28a2e4b
1 changed files with 9 additions and 0 deletions
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9
nptl/allocatestack.c
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@ -379,6 +379,15 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
pd = get_cached_stack (&size, &mem); pd = get_cached_stack (&size, &mem);
if (pd == NULL) if (pd == NULL)
{ {
/* To avoid aliasing effects on a larger scale then pages we
adjust the allocated stack size if necessary. This way
allocations directly following each other will not have
aliasing problems. */
#if MULTI_PAGE_ALIASING != 0
if ((size % MULTI_PAGE_ALIASING) == 0)
size += pagesize_m1 + 1;
#endif
mem = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC, mem = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | ARCH_MAP_FLAGS, -1, 0); MAP_PRIVATE | MAP_ANONYMOUS | ARCH_MAP_FLAGS, -1, 0);