mirror of
https://github.com/jart/cosmopolitan.git
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56 lines
2.8 KiB
C
56 lines
2.8 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/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/thread.h"
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#define _TLSZ ((intptr_t)_tls_size)
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#define _TLDZ ((intptr_t)_tdata_size)
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#define _TIBZ sizeof(struct cthread_descriptor_t)
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#define _MEMZ ROUNDUP(_TLSZ + _TIBZ, alignof(struct cthread_descriptor_t))
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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(char **out_tib) {
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char *tls;
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cthread_t tib;
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// Allocate enough TLS memory for all the GNU Linuker (_tls_size)
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// organized _Thread_local data, as well as Cosmpolitan Libc (64)
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if (!(tls = calloc(1, _MEMZ))) return 0;
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// set up thread information block
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tib = (cthread_t)(tls + _MEMZ - _TIBZ);
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tib->self = tib;
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tib->self2 = tib;
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tib->err = 0;
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tib->tid = -1;
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memmove(tls, _tdata_start, _TLDZ);
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if (out_tib) {
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*out_tib = (char *)tib;
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}
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return tls;
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}
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