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/* Allocate a new stack. Mach version.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <mach.h>
#include <mach/machine/vm_param.h>
#include <pt-internal.h>
/* The next address to use for stack allocation. */
static vm_address_t next_stack_base = VM_MIN_ADDRESS;
/* Allocate a new stack of size STACKSIZE. If successful, store the
address of the newly allocated stack in *STACKADDR and return 0.
Otherwise return an error code (EINVAL for an invalid stack size,
EAGAIN if the system lacked the necessary resources to allocate a
new stack). */
int
__pthread_stack_alloc (void **stackaddr, size_t stacksize)
{
vm_offset_t base;
int i = 0;
get_stack:
i++;
for (base = next_stack_base;
base < VM_MAX_ADDRESS
&& __vm_allocate (__mach_task_self (), &base,
stacksize, FALSE) != KERN_SUCCESS; base += stacksize)
;
if (base >= VM_MAX_ADDRESS)
{
if (i == 1)
{
next_stack_base = VM_MIN_ADDRESS;
goto get_stack;
}
else
return EAGAIN;
}
if (base >= VM_MAX_ADDRESS)
return EAGAIN;
next_stack_base = base + stacksize;
(*stackaddr) = (void *) base;
return 0;
}
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