mirror of
https://github.com/jart/cosmopolitan.git
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3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
59 lines
2.7 KiB
C
59 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/calls/blockcancel.internal.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/runtime/internal.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/tls.h"
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#ifdef MODE_DBG
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int begin_cancellation_point(void) {
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int state = 0;
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struct CosmoTib *tib;
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struct PosixThread *pt;
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if (__enable_tls) {
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tib = __get_tls();
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if ((pt = (struct PosixThread *)tib->tib_pthread)) {
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state = pt->flags & PT_INCANCEL;
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pt->flags |= PT_INCANCEL;
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}
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}
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return state;
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}
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void end_cancellation_point(int state) {
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struct CosmoTib *tib;
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struct PosixThread *pt;
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if (__enable_tls) {
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tib = __get_tls();
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if ((pt = (struct PosixThread *)tib->tib_pthread)) {
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pt->flags &= ~PT_INCANCEL;
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pt->flags |= state;
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}
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}
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}
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void report_cancellation_point(void) {
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BLOCK_CANCELLATIONS;
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_bt("error: need BEGIN/END_CANCELLATION_POINT\n");
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ALLOW_CANCELLATIONS;
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}
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#endif /* MODE_DBG */
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