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https://github.com/jart/cosmopolitan.git
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379cd77078
On Windows, mmap() now chooses addresses transactionally. It reduces the risk of badness when interacting with the WIN32 memory manager. We don't throw darts anymore. There is also no more retry limit, since we recover from mystery maps more gracefully. The subroutine for combining adjacent maps has been rewritten for clarity. The print maps subroutine is better This change goes to great lengths to perfect the stack overflow code. On Windows you can now longjmp() out of a crash signal handler. Guard pages previously weren't being restored properly by the signal handler. That's fixed, so on Windows you can now handle a stack overflow multiple times. Great thought has been put into selecting the perfect SIGSTKSZ constants so you can save sigaltstack() memory. You can now use kprintf() with 512 bytes of stack available. The guard pages beneath the main stack are now recorded in the memory manager. This change fixes getcontext() so it works right with the %rax register.
65 lines
3.6 KiB
C
65 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/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.
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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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errno_t 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->pt_attr, sizeof(pt->pt_attr));
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switch (atomic_load_explicit(&pt->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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__builtin_unreachable();
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}
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return 0;
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}
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