mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
7ff0ea8c13
pthread_mutex_lock() now uses a better algorithm which goes much faster in multithreaded environments that have lock contention. This comes at the cost of adding some fixed-cost overhead to mutex invocations. That doesn't matter for Cosmopolitan because our core libraries all encode locking operations as NOP instructions when in single-threaded mode. Overhead only applies starting the moment you first call clone().
61 lines
2.9 KiB
C
61 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 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/calls/sig.internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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/**
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* @fileoverview UNIX signals for the New Technology, Part 1.
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* @threadsafe
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*/
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struct Signals __sig; // TODO(jart): Need TLS
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/**
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* Changes signal mask for main thread.
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* @return 0 on success, or -1 w/ errno
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*/
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textwindows int __sig_mask(int how, const sigset_t *neu, sigset_t *old) {
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int i;
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uint64_t a, b;
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if (how == SIG_BLOCK || how == SIG_UNBLOCK || how == SIG_SETMASK) {
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__sig_lock();
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if (old) {
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*old = __sig.mask;
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}
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if (neu) {
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for (i = 0; i < ARRAYLEN(__sig.mask.__bits); ++i) {
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if (how == SIG_BLOCK) {
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__sig.mask.__bits[i] |= neu->__bits[i];
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} else if (how == SIG_UNBLOCK) {
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__sig.mask.__bits[i] &= ~neu->__bits[i];
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} else {
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__sig.mask.__bits[i] = neu->__bits[i];
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}
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}
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__sig.mask.__bits[0] &= ~(SIGKILL | SIGSTOP);
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}
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__sig_unlock();
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return 0;
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} else {
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return einval();
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}
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}
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