mirror of
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53 lines
3.1 KiB
C
53 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/errno.h"
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#include "libc/intrin/pthread.h"
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/**
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* Sets size of thread stack.
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*
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* Your stack must have at least `PTHREAD_STACK_MIN` bytes, which
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* Cosmpolitan Libc defines as `GetStackSize()`. It's a link-time
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* constant used by Actually Portable Executable that's 128 kb by
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* default. See libc/runtime/stack.h for docs on your stack limit
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* since the APE ELF phdrs are the one true source of truth here.
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*
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* Cosmpolitan Libc runtime magic (e.g. ftrace) and memory safety
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* (e.g. kprintf) assumes that stack sizes are two-powers and are
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* aligned to that two-power. Conformance isn't required since we
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* say caveat emptor to those who don't maintain these invariants
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*
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* Unlike pthread_attr_setstack() this function should be used if
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* you want the Cosmopolitan Libc runtime to allocate a stack for
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* you. Since the runtime uses mmap(MAP_STACK) to do that, you'll
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* need to choose a multiple of FRAMESIZE, due to Windows.
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*
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* If this function isn't called it'll default to GetStackSize().
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*
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* @param x contains stack size in bytes
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* @return 0 on success, or errno on error
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* @raise EINVAL if `x` is less than `PTHREAD_STACK_MIN`
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*/
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int pthread_attr_setstacksize(pthread_attr_t *a, size_t x) {
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if (x < PTHREAD_STACK_MIN) return EINVAL;
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if (x & (FRAMESIZE - 1)) return EINVAL;
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if (x < FRAMESIZE) return EINVAL;
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a->stacksize = x;
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return 0;
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}
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