mirror of
https://github.com/jart/cosmopolitan.git
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119 lines
4.6 KiB
C
119 lines
4.6 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.h"
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#include "libc/intrin/strace.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 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 _pthread_unkey(struct CosmoTib *tib) {
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for (int j = 0; j < PTHREAD_DESTRUCTOR_ITERATIONS; ++j) {
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bool gotsome = false;
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for (int i = 0; i < PTHREAD_KEYS_MAX; ++i) {
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void *val;
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pthread_key_dtor dtor;
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if ((dtor = atomic_load_explicit(&_pthread_key_dtor[i],
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memory_order_acquire)) &&
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dtor != (pthread_key_dtor)-1 &&
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(val = atomic_exchange_explicit(&tib->tib_keys[i], 0,
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memory_order_relaxed))) {
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STRACE("_pthread_unkey(%t, %p)", dtor, val);
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gotsome = true;
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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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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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if (_weaken(free)) {
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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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}
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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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// "Any cancellation cleanup handlers that have been pushed and not
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// yet popped shall be popped in the reverse order that they were
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// pushed and then executed." ──Quoth POSIX.1-2017
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_pthread_unwind(tib);
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// "After all cancellation cleanup handlers have been executed, if the
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// thread has any thread-specific data, appropriate destructor
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// functions shall be called in an unspecified order."
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// ──Quoth POSIX.1-2017
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if (tib->tib_nsync)
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_weaken(nsync_waiter_destroy)(tib->tib_nsync);
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_pthread_unkey(tib);
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_pthread_ungarbage(tib);
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while ((dtor = tib->tib_atexit)) {
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STRACE("__cxa_finalize(%t, %p)", dtor->fun, dtor->arg);
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tib->tib_atexit = 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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struct CosmoTib *tib;
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tib = __get_tls();
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dtor->fun = fun;
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dtor->arg = arg;
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dtor->next = tib->tib_atexit;
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tib->tib_atexit = dtor;
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return 0;
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}
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