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()
66 lines
3.7 KiB
C
66 lines
3.7 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/intrin/atomic.h"
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#include "libc/str/str.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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/**
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* Gets thread attributes.
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*
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* These attributes are copied from the ones supplied when
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* pthread_create() was called. However this function supplies
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* additional runtime information too:
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*
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* 1. The detached state. You can use pthread_attr_getdetachstate() on
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* the `attr` result to see, for example, if a thread detached itself
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* or some other thread detached it, after it was spawned.
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*
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* 2. The thread's stack. You can use pthread_attr_getstack() to see the
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* address and size of the stack that was allocated by cosmo for your
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* thread. This is useful for knowing where the stack is. It can also
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* be useful If you explicitly configured a stack too, since we might
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* have needed to slightly tune the address and size to meet platform
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* requirements. This function returns information that reflects that
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*
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* 3. You can view changes pthread_create() may have made to the stack
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* guard size by calling pthread_attr_getguardsize() on `attr`
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*
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* @param attr is output argument that receives attributes, which should
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* find its way to pthread_attr_destroy() when it's done being used
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* @return 0 on success, or errno on error
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* @raise ENOMEM is listed as a possible result by LSB 5.0
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*/
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int pthread_getattr_np(pthread_t thread, pthread_attr_t *attr) {
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struct PosixThread *pt = (struct PosixThread *)thread;
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memcpy(attr, &pt->attr, sizeof(pt->attr));
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switch (atomic_load_explicit(&pt->status, memory_order_relaxed)) {
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case kPosixThreadJoinable:
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case kPosixThreadTerminated:
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attr->__detachstate = PTHREAD_CREATE_JOINABLE;
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break;
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case kPosixThreadDetached:
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case kPosixThreadZombie:
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attr->__detachstate = PTHREAD_CREATE_DETACHED;
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break;
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default:
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unreachable;
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}
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return 0;
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}
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