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* sysdeps/mach/hurd/brk.c (_hurd_set_brk): Deallocate and reallocate 

pages rather than just reprotecting them.  This way we don't hold on
	to the backing space.
This commit is contained in:
Roland McGrath 1999-09-19 20:40:43 +00:00
parent 349447daaf
commit 55ffcab7b6
2 changed files with 16 additions and 3 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
1999-09-19 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/mach/hurd/brk.c (_hurd_set_brk): Deallocate and reallocate
pages rather than just reprotecting them. This way we don't hold on
to the backing space.
* hurd/hurdprio.c (_hurd_priority_which_map): Rearrange the code a bit.
Use __munmap instead of __vm_deallocate.

15
sysdeps/mach/hurd/brk.c
View File

@ -72,9 +72,18 @@ _hurd_set_brk (vm_address_t addr)
if (pagend <= pagebrk)
{
if (pagend < pagebrk)
/* Make that memory inaccessible. */
__vm_protect (__mach_task_self (), pagend, pagebrk - pagend,
0, VM_PROT_NONE);
{
/* XXX wish this were atomic... */
/* First deallocate the memory to release its backing space. */
__vm_deallocate (__mach_task_self (), pagend, pagebrk - pagend);
/* Now reallocate it with no access allowed. */
err = __vm_map (__mach_task_self (),
&pagend, _hurd_data_end - pagend,
0, 0, MACH_PORT_NULL, 0, 0,
0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE,
VM_INHERIT_COPY);
/* XXX what if error? */
}
_hurd_brk = addr;
return 0;
}