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https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
624573207e
This change doubles the performance of thread spawning. That's thanks to our new stack manager, which allows us to avoid zeroing stacks. It gives us 15µs spawns rather than 30µs spawns on Linux. Also, pthread_exit() is faster now, since it doesn't need to acquire the pthread GIL. On NetBSD, that helps us avoid allocating too many semaphores. Even if that happens we're now able to survive semaphores running out and even memory running out, when allocating *NSYNC waiter objects. I found a lot more rare bugs in the POSIX threads runtime that could cause things to crash, if you've got dozens of threads all spawning and joining dozens of threads. I want cosmo to be world class production worthy for 2025 so happy holidays all
53 lines
2.9 KiB
C
53 lines
2.9 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 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/str/str.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/thread/thread2.h"
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/**
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* Sets signal mask on thread attributes object.
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*
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* For example, to spawn a thread that won't interfere with signals:
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*
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* pthread_t id;
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* sigset_t mask;
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* pthread_attr_t attr;
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* sigfillset(&mask);
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* pthread_attr_init(&attr);
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* pthread_attr_setsigmask_np(&attr, &mask);
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* pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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* pthread_create(&id, &attr, Worker, 0);
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* pthread_attr_destroy(&attr);
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*
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* @param attr is the thread attributes object
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* @param sigmask will be copied into attributes, or if it's null, then
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* the existing signal mask presence on the object will be cleared
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* @return 0 on success, or errno on error
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*/
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errno_t pthread_attr_setsigmask_np(pthread_attr_t *attr,
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const sigset_t *sigmask) {
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_Static_assert(sizeof(attr->__sigmask) == sizeof(*sigmask), "");
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if (sigmask) {
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attr->__havesigmask = true;
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attr->__sigmask = *sigmask;
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} else {
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attr->__havesigmask = false;
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}
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return 0;
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}
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