mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 17:27:56 +00:00
997ce29ddc
- SQLite file locking now works on Windows - SQLite will now use fdatasync() on non-Apple platforms - Fix Ctrl-C handler on Windows to not crash with TLS - Signals now work in multithreaded apps on Windows - fcntl() will now accurately report EINVAL errors - fcntl() now has excellent --strace logging - Token bucket replenish now go 100x faster - *NSYNC cancellations now work on Windows - Support closefrom() on NetBSD
68 lines
3.2 KiB
C
68 lines
3.2 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/intrin/asan.internal.h"
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#include "libc/intrin/asancodes.h"
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#include "libc/intrin/atomic.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/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/thread/spawn.h"
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#include "libc/thread/tls.h"
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#define I(x) ((intptr_t)x)
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void Bzero(void *, size_t) asm("bzero"); // gcc bug
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/**
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* Allocates thread-local storage memory for new thread.
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* @return buffer that must be released with free()
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*/
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char *_mktls(struct CosmoTib **out_tib) {
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char *tls;
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struct CosmoTib *tib;
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// allocate memory for tdata, tbss, and tib
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tls = memalign(TLS_ALIGNMENT, I(_tls_size) + sizeof(struct CosmoTib));
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if (!tls) return 0;
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// poison memory between tdata and tbss
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if (IsAsan()) {
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__asan_poison(tls + I(_tdata_size), I(_tbss_offset) - I(_tdata_size),
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kAsanProtected);
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}
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// initialize tdata and clear tbss
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memmove(tls, _tdata_start, I(_tdata_size));
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Bzero(tls + I(_tbss_offset), I(_tbss_size) + sizeof(struct CosmoTib));
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// set up thread information block
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tib = (struct CosmoTib *)(tls + I(_tls_size));
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tib->tib_self = tib;
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tib->tib_self2 = tib;
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tib->tib_sigmask = __get_tls()->tib_sigmask;
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atomic_store_explicit(&tib->tib_tid, -1, memory_order_relaxed);
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if (out_tib) {
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*out_tib = tib;
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}
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return tls;
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}
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