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https://github.com/jart/cosmopolitan.git
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15ea0524b3
This change reduces o/tiny/examples/life from 44kb to 24kb in size since it avoids linking mmap() when unnecessary. This is important, to helping cosmo not completely lose touch with its roots.
51 lines
2.7 KiB
C
51 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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/calls/calls.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall-sysv.internal.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/likely.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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/**
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* Returns current thread id.
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*
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* On Linux, and Linux only, this is guaranteed to be equal to getpid()
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* if this is the main thread. On NetBSD, gettid() for the main thread
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* is always 1.
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*
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* @return thread id greater than zero or -1 w/ errno
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* @asyncsignalsafe
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* @vforksafe
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*/
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int gettid(void) {
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int tid;
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if (VERY_LIKELY(__tls_enabled && !__vforked)) {
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tid = atomic_load_explicit(&__get_tls()->tib_tid, memory_order_acquire);
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if (VERY_LIKELY(tid > 0))
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return tid;
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}
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if (IsXnuSilicon()) {
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return enosys(); // can only happen if we can't access thread local storage
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} else {
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return sys_gettid();
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}
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}
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