mirror of
https://github.com/jart/cosmopolitan.git
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105 lines
4 KiB
C
105 lines
4 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 2023 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/intrin/cxaatexit.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/gc.internal.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/tls.h"
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#include "third_party/nsync/wait_s.internal.h"
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struct Dtor {
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void *fun;
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void *arg;
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struct Dtor *next;
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};
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static _Thread_local struct Dtor *__cxa_thread_atexit_list;
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static void _pthread_unwind(struct CosmoTib *tib) {
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struct PosixThread *pt;
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struct _pthread_cleanup_buffer *cb;
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pt = (struct PosixThread *)tib->tib_pthread;
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while ((cb = pt->pt_cleanup)) {
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pt->pt_cleanup = cb->__prev;
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cb->__routine(cb->__arg);
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}
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}
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static void __cxa_thread_unkey(struct CosmoTib *tib) {
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void *val;
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int i, j, gotsome;
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pthread_key_dtor dtor;
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for (j = 0; j < PTHREAD_DESTRUCTOR_ITERATIONS; ++j) {
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for (gotsome = i = 0; i < PTHREAD_KEYS_MAX; ++i) {
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if ((val = tib->tib_keys[i]) &&
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(dtor = atomic_load_explicit(_pthread_key_dtor + i,
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memory_order_relaxed)) &&
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dtor != (pthread_key_dtor)-1) {
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gotsome = 1;
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tib->tib_keys[i] = 0;
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dtor(val);
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}
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}
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if (!gotsome) {
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break;
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}
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}
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}
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static void _pthread_ungarbage(struct CosmoTib *tib) {
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struct Garbages *g;
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while ((g = tib->tib_garbages)) {
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tib->tib_garbages = 0;
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while (g->i--) {
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((void (*)(intptr_t))g->p[g->i].fn)(g->p[g->i].arg);
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}
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_weaken(free)(g->p);
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_weaken(free)(g);
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}
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}
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void __cxa_thread_finalize(void) {
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struct Dtor *dtor;
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struct CosmoTib *tib;
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tib = __get_tls();
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_pthread_unwind(tib);
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if (tib->tib_nsync)
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_weaken(nsync_waiter_destroy)(tib->tib_nsync);
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__cxa_thread_unkey(tib);
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_pthread_ungarbage(tib);
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while ((dtor = __cxa_thread_atexit_list)) {
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__cxa_thread_atexit_list = dtor->next;
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((void (*)(void *))dtor->fun)(dtor->arg);
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_weaken(free)(dtor);
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}
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}
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int __cxa_thread_atexit_impl(void *fun, void *arg, void *dso_symbol) {
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struct Dtor *dtor;
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if (!_weaken(malloc))
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return -1;
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if (!(dtor = _weaken(malloc)(sizeof(struct Dtor))))
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return -1;
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dtor->fun = fun;
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dtor->arg = arg;
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dtor->next = __cxa_thread_atexit_list;
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__cxa_thread_atexit_list = dtor;
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return 0;
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}
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