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Apply fixup to cthread initialization (#301)

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Cosmopolitan Threads are currently Linux-only (with some NetBSD
and Windows support too!). This change ensures we only initialize
the high-level threading runtime when Cosmopolitan Threads are used.
This commit is contained in:
Justine Tunney 2021-10-25 16:22:10 -07:00
parent 45a7435788
commit 91d783352a
3 changed files with 13 additions and 9 deletions
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74
libc/thread/init.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/dce.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/nr.h"
#include "libc/sysv/consts/prot.h"
#include "libc/thread/descriptor.h"
// TLS boundaries
extern char _tbss_start, _tbss_end, _tdata_start, _tdata_end;
static textstartup void _main_thread_init(void) {
if (!IsLinux()) return; /* TODO */
size_t tbsssize = &_tbss_end - &_tbss_start;
size_t tdatasize = &_tdata_end - &_tdata_start;
size_t tlssize = tbsssize + tdatasize;
size_t totalsize = tlssize + sizeof(struct cthread_descriptor_t);
totalsize = (totalsize + PAGESIZE - 1) & -PAGESIZE;
uintptr_t mem = (uintptr_t)mmap(NULL, totalsize, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mem == -1) {
abort();
}
void* bottom = (void*)mem;
void* top = (void*)(mem + totalsize);
cthread_t td = (cthread_t)top - 1;
td->self = td;
td->stack.top = NULL;
td->stack.bottom = NULL;
td->tls.top = top;
td->tls.bottom = bottom;
td->alloc.top = top;
td->alloc.bottom = bottom;
td->state = cthread_main;
// Initialize TLS with content of .tdata section
memmove((void*)((uintptr_t)td - tlssize), &_tdata_start, tdatasize);
// Get TID of main thread
int gettid = __NR_gettid;
if (gettid == 0xfff) gettid = __NR_getpid;
td->tid = syscall(gettid);
// Set FS
if (arch_prctl(ARCH_SET_FS, td) != 0) {
abort();
}
}
const void* const _main_thread_ctor[] initarray = {
_main_thread_init,
};