/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/blockcancel.internal.h"
#include "libc/calls/cp.internal.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/tls.h"
#ifdef MODE_DBG

int begin_cancellation_point(void) {
  int state = 0;
  struct CosmoTib *tib;
  struct PosixThread *pt;
  if (__tls_enabled) {
    tib = __get_tls();
    if ((pt = (struct PosixThread *)tib->tib_pthread)) {
      state = pt->flags & PT_INCANCEL;
      pt->flags |= PT_INCANCEL;
    }
  }
  return state;
}

void end_cancellation_point(int state) {
  struct CosmoTib *tib;
  struct PosixThread *pt;
  if (__tls_enabled) {
    tib = __get_tls();
    if ((pt = (struct PosixThread *)tib->tib_pthread)) {
      pt->flags &= ~PT_INCANCEL;
      pt->flags |= state;
    }
  }
}

void report_cancellation_point(void) {
  BLOCK_CANCELLATIONS;
  _bt("error: need BEGIN/END_CANCELLATION_POINT\n");
  ALLOW_CANCELLATIONS;
}

#endif /* MODE_DBG */