mirror of
https://github.com/jart/cosmopolitan.git
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0a24b4fc3c
The *NSYNC linked list API is good enough that it deserves to be part of the C libray, so this change writes an improved version of it which uses that offsetof() trick from the Linux Kernel. We vendor all of the *NSYNC tests in third_party which helped confirm the needed refactoring is safe This change also deletes more old code that didn't pan out. My goal here is to work towards a vision where the Cosmopolitan core libraries become less experimental and more focused on curation. This better reflects the current level of quality we've managed to achieve.
48 lines
2.7 KiB
C
48 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 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/intrin/dll.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/thread.h"
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#include "libc/thread/tls.h"
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/**
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* Releases memory of detached threads that have terminated.
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*/
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void pthread_decimate_np(void) {
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struct Dll *e;
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struct PosixThread *pt;
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enum PosixThreadStatus status;
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StartOver:
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pthread_spin_lock(&_pthread_lock);
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for (e = dll_first(_pthread_list); e; e = dll_next(_pthread_list, e)) {
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pt = POSIXTHREAD_CONTAINER(e);
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if (pt->tib == __get_tls()) continue;
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status = atomic_load_explicit(&pt->status, memory_order_acquire);
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if (status != kPosixThreadZombie) break;
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if (!atomic_load_explicit(&pt->tib->tib_tid, memory_order_acquire)) {
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dll_remove(&_pthread_list, e);
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pthread_spin_unlock(&_pthread_lock);
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_pthread_free(pt);
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goto StartOver;
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}
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}
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pthread_spin_unlock(&_pthread_lock);
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}
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