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