mirror of
https://github.com/jart/cosmopolitan.git
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6ffed14b9c
Actually Portable Executable now supports Android. Cosmo's old mmap code required a 47 bit address space. The new implementation is very agnostic and supports both smaller address spaces (e.g. embedded) and even modern 56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native page size. This fixes a longstanding POSIX conformance issue, concerning file mappings that overlap the end of file. Other aspects of conformance have been improved too, such as the subtleties of address assignment and and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE On Windows, mappings larger than 100 megabytes won't be broken down into thousands of independent 64kb mappings. Support for MAP_STACK is removed by this change; please use NewCosmoStack() instead. Stack overflow avoidance is now being implemented using the POSIX thread APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
81 lines
4.1 KiB
C
81 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 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/assert.h"
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#include "libc/calls/struct/rlimit.h"
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#include "libc/dce.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/maps.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/rlim.h"
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#include "libc/sysv/consts/rlimit.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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if (!attr->__stacksize && (pt->pt_flags & PT_STATIC)) {
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attr->__stackaddr = __maps.stack.addr;
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attr->__stacksize = __maps.stack.size;
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attr->__guardsize = 0;
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}
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return 0;
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}
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