mirror of
https://github.com/jart/cosmopolitan.git
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4a6fd3d910
- fix rare thread exit race condition on openbsd - pthread_getattr_np() now supplies detached status - child threads may now pthread_join() the main thread - introduce sigandset(), sigorset(), and sigisemptyset() - introduce pthread_cleanup_push() and pthread_cleanup_pop()
79 lines
4.1 KiB
C
79 lines
4.1 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/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/thread/thread.h"
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/**
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* Configures custom allocated stack for thread, e.g.
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*
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* pthread_t id;
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* pthread_attr_t attr;
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* char *stk = _mapstack();
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* pthread_attr_init(&attr);
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* pthread_attr_setstack(&attr, stk, GetStackSize());
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* pthread_create(&id, &attr, func, 0);
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* pthread_attr_destroy(&attr);
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* pthread_join(id, 0);
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* _freestack(stk);
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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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* please consider using _mapstack() which always does it perfect
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* or use `mmap(0, GetStackSize() << 1, ...)` for a bigger stack.
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*
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* Unlike pthread_attr_setstacksize(), this function permits just
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* about any parameters and will change the values and allocation
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* as needed to conform to the mandatory requirements of the host
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* operating system even if it doesn't meet the stricter needs of
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* Cosmopolitan Libc userspace libraries. For example with malloc
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* allocations, things like page size alignment, shall be handled
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* automatically for compatibility with existing codebases.
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*
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* @param stackaddr is address of stack allocated by caller, and
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* may be NULL in which case default behavior is restored
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* @param stacksize is size of caller allocated stack
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* @return 0 on success, or errno on error
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* @raise EINVAL if parameters were unacceptable
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* @see pthread_attr_setstacksize()
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*/
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errno_t pthread_attr_setstack(pthread_attr_t *attr, void *stackaddr,
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size_t stacksize) {
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if (!stackaddr) {
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attr->__stackaddr = 0;
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attr->__stacksize = 0;
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return 0;
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}
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if (stacksize < PTHREAD_STACK_MIN ||
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(IsAsan() && !__asan_is_valid(stackaddr, stacksize))) {
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return EINVAL;
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}
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attr->__stackaddr = stackaddr;
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attr->__stacksize = stacksize;
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return 0;
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}
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