mirror of
https://github.com/jart/cosmopolitan.git
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74 lines
3.1 KiB
C
74 lines
3.1 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/intrin/atomic.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/spawn.h"
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/**
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* @fileoverview Memory collector for detached threads.
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*/
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static struct Zombie {
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struct Zombie *next;
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struct PosixThread *pt;
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} * pthread_zombies;
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void pthread_zombies_add(struct PosixThread *pt) {
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struct Zombie *z;
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if ((z = malloc(sizeof(struct Zombie)))) {
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z->pt = pt;
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z->next = atomic_load(&pthread_zombies);
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for (;;) {
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if (atomic_compare_exchange_weak(&pthread_zombies, &z->next, z)) {
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break;
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}
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}
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}
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}
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static void pthread_zombies_collect(struct Zombie *z) {
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pthread_wait(z->pt);
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pthread_free(z->pt);
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free(z);
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}
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void pthread_zombies_decimate(void) {
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struct Zombie *z;
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while ((z = atomic_load(&pthread_zombies)) &&
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atomic_load(&z->pt->status) == kPosixThreadZombie) {
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if (atomic_compare_exchange_strong(&pthread_zombies, &z, z->next)) {
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pthread_zombies_collect(z);
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}
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}
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}
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void pthread_zombies_harvest(void) {
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struct Zombie *z;
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while ((z = atomic_load(&pthread_zombies))) {
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if (atomic_compare_exchange_weak(&pthread_zombies, &z, z->next)) {
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pthread_zombies_collect(z);
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}
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}
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}
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__attribute__((__constructor__)) static void init(void) {
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atexit(pthread_zombies_harvest);
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}
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