a7b84c6512
pthread_suspend_all_np() may have already suspended its parent thread. Add locking code in pthread_suspend_all_np() to only allow one thread to suspend other threads, this eliminates a deadlock where two or more threads try to suspend each others.
750 lines
18 KiB
C
750 lines
18 KiB
C
/*
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* Copyright (c) 2005, David Xu <davidxu@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/signalvar.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "thr_private.h"
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/* #define DEBUG_SIGNAL */
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#ifdef DEBUG_SIGNAL
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#define DBG_MSG stdout_debug
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#else
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#define DBG_MSG(x...)
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#endif
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struct usigaction {
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struct sigaction sigact;
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struct urwlock lock;
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};
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static struct usigaction _thr_sigact[_SIG_MAXSIG];
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static void thr_sighandler(int, siginfo_t *, void *);
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static void handle_signal(struct sigaction *, int, siginfo_t *, ucontext_t *);
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static void check_deferred_signal(struct pthread *);
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static void check_suspend(struct pthread *);
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static void check_cancel(struct pthread *curthread, ucontext_t *ucp);
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int ___pause(void);
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int _raise(int);
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int __sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec * timeout);
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int _sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec * timeout);
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int __sigwaitinfo(const sigset_t *set, siginfo_t *info);
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int _sigwaitinfo(const sigset_t *set, siginfo_t *info);
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int ___sigwait(const sigset_t *set, int *sig);
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int _sigwait(const sigset_t *set, int *sig);
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int __sigsuspend(const sigset_t *sigmask);
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int _sigaction(int, const struct sigaction *, struct sigaction *);
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int _setcontext(const ucontext_t *);
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int _swapcontext(ucontext_t *, const ucontext_t *);
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static const sigset_t _thr_deferset={{
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0xffffffff & ~(_SIG_BIT(SIGBUS)|_SIG_BIT(SIGILL)|_SIG_BIT(SIGFPE)|
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_SIG_BIT(SIGSEGV)|_SIG_BIT(SIGTRAP)|_SIG_BIT(SIGSYS)),
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0xffffffff,
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0xffffffff,
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0xffffffff}};
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static const sigset_t _thr_maskset={{
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0xffffffff,
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0xffffffff,
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0xffffffff,
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0xffffffff}};
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void
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_thr_signal_block(struct pthread *curthread)
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{
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if (curthread->sigblock > 0) {
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curthread->sigblock++;
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return;
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}
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__sys_sigprocmask(SIG_BLOCK, &_thr_maskset, &curthread->sigmask);
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curthread->sigblock++;
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}
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void
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_thr_signal_unblock(struct pthread *curthread)
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{
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if (--curthread->sigblock == 0)
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__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);
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}
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int
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_thr_send_sig(struct pthread *thread, int sig)
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{
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return thr_kill(thread->tid, sig);
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}
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static inline void
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remove_thr_signals(sigset_t *set)
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{
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if (SIGISMEMBER(*set, SIGCANCEL))
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SIGDELSET(*set, SIGCANCEL);
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}
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static const sigset_t *
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thr_remove_thr_signals(const sigset_t *set, sigset_t *newset)
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{
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*newset = *set;
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remove_thr_signals(newset);
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return (newset);
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}
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static void
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sigcancel_handler(int sig __unused,
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siginfo_t *info __unused, ucontext_t *ucp)
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{
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struct pthread *curthread = _get_curthread();
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int err;
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if (THR_IN_CRITICAL(curthread))
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return;
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err = errno;
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check_suspend(curthread);
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check_cancel(curthread, ucp);
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errno = err;
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}
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typedef void (*ohandler)(int sig, int code,
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struct sigcontext *scp, char *addr, __sighandler_t *catcher);
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/*
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* The signal handler wrapper is entered with all signal masked.
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*/
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static void
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thr_sighandler(int sig, siginfo_t *info, void *_ucp)
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{
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struct pthread *curthread = _get_curthread();
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ucontext_t *ucp = _ucp;
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struct sigaction act;
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int err;
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err = errno;
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_thr_rwl_rdlock(&_thr_sigact[sig-1].lock);
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act = _thr_sigact[sig-1].sigact;
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_thr_rwl_unlock(&_thr_sigact[sig-1].lock);
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errno = err;
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/*
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* if a thread is in critical region, for example it holds low level locks,
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* try to defer the signal processing, however if the signal is synchronous
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* signal, it means a bad thing has happened, this is a programming error,
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* resuming fault point can not help anything (normally causes deadloop),
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* so here we let user code handle it immediately.
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*/
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if (THR_IN_CRITICAL(curthread) && SIGISMEMBER(_thr_deferset, sig)) {
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memcpy(&curthread->deferred_sigact, &act, sizeof(struct sigaction));
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memcpy(&curthread->deferred_siginfo, info, sizeof(siginfo_t));
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curthread->deferred_sigmask = ucp->uc_sigmask;
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/* mask all signals, we will restore it later. */
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ucp->uc_sigmask = _thr_deferset;
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return;
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}
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handle_signal(&act, sig, info, ucp);
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}
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static void
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handle_signal(struct sigaction *actp, int sig, siginfo_t *info, ucontext_t *ucp)
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{
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struct pthread *curthread = _get_curthread();
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ucontext_t uc2;
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__siginfohandler_t *sigfunc;
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int cancel_point;
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int cancel_async;
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int cancel_enable;
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int in_sigsuspend;
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int err;
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/* add previous level mask */
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SIGSETOR(actp->sa_mask, ucp->uc_sigmask);
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/* add this signal's mask */
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if (!(actp->sa_flags & SA_NODEFER))
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SIGADDSET(actp->sa_mask, sig);
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in_sigsuspend = curthread->in_sigsuspend;
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curthread->in_sigsuspend = 0;
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/*
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* if thread is in deferred cancellation mode, disable cancellation
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* in signal handler.
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* if user signal handler calls a cancellation point function, e.g,
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* it calls write() to write data to file, because write() is a
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* cancellation point, the thread is immediately cancelled if
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* cancellation is pending, to avoid this problem while thread is in
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* deferring mode, cancellation is temporarily disabled.
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*/
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cancel_point = curthread->cancel_point;
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cancel_async = curthread->cancel_async;
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cancel_enable = curthread->cancel_enable;
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curthread->cancel_point = 0;
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if (!cancel_async)
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curthread->cancel_enable = 0;
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/* restore correct mask before calling user handler */
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__sys_sigprocmask(SIG_SETMASK, &actp->sa_mask, NULL);
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sigfunc = actp->sa_sigaction;
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/*
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* We have already reset cancellation point flags, so if user's code
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* longjmp()s out of its signal handler, wish its jmpbuf was set
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* outside of a cancellation point, in most cases, this would be
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* true. however, ther is no way to save cancel_enable in jmpbuf,
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* so after setjmps() returns once more, the user code may need to
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* re-set cancel_enable flag by calling pthread_setcancelstate().
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*/
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if ((actp->sa_flags & SA_SIGINFO) != 0)
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(*(sigfunc))(sig, info, ucp);
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else {
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((ohandler)(*sigfunc))(
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sig, info->si_code, (struct sigcontext *)ucp,
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info->si_addr, (__sighandler_t *)sigfunc);
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}
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err = errno;
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curthread->in_sigsuspend = in_sigsuspend;
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curthread->cancel_point = cancel_point;
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curthread->cancel_enable = cancel_enable;
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memcpy(&uc2, ucp, sizeof(uc2));
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SIGDELSET(uc2.uc_sigmask, SIGCANCEL);
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/* reschedule cancellation */
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check_cancel(curthread, &uc2);
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errno = err;
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__sys_sigreturn(&uc2);
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}
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void
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_thr_ast(struct pthread *curthread)
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{
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if (!THR_IN_CRITICAL(curthread)) {
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check_deferred_signal(curthread);
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check_suspend(curthread);
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check_cancel(curthread, NULL);
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}
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}
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/* reschedule cancellation */
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static void
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check_cancel(struct pthread *curthread, ucontext_t *ucp)
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{
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if (__predict_true(!curthread->cancel_pending ||
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!curthread->cancel_enable || curthread->no_cancel))
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return;
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/*
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* Otherwise, we are in defer mode, and we are at
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* cancel point, tell kernel to not block the current
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* thread on next cancelable system call.
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*
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* There are three cases we should call thr_wake() to
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* turn on TDP_WAKEUP or send SIGCANCEL in kernel:
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* 1) we are going to call a cancelable system call,
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* non-zero cancel_point means we are already in
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* cancelable state, next system call is cancelable.
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* 2) because _thr_ast() may be called by
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* THR_CRITICAL_LEAVE() which is used by rtld rwlock
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* and any libthr internal locks, when rtld rwlock
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* is used, it is mostly caused my an unresolved PLT.
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* those routines may clear the TDP_WAKEUP flag by
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* invoking some system calls, in those cases, we
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* also should reenable the flag.
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* 3) thread is in sigsuspend(), and the syscall insists
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* on getting a signal before it agrees to return.
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*/
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if (curthread->cancel_point) {
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if (curthread->in_sigsuspend && ucp) {
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SIGADDSET(ucp->uc_sigmask, SIGCANCEL);
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curthread->unblock_sigcancel = 1;
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_thr_send_sig(curthread, SIGCANCEL);
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} else
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thr_wake(curthread->tid);
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} else if (curthread->cancel_async) {
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/*
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* asynchronous cancellation mode, act upon
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* immediately.
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*/
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_pthread_exit_mask(PTHREAD_CANCELED,
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ucp? &ucp->uc_sigmask : NULL);
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}
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}
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static void
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check_deferred_signal(struct pthread *curthread)
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{
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ucontext_t *uc;
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struct sigaction act;
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siginfo_t info;
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if (__predict_true(curthread->deferred_siginfo.si_signo == 0))
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return;
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#if defined(__amd64__) || defined(__i386__)
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uc = alloca(__getcontextx_size());
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__fillcontextx((char *)uc);
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#else
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ucontext_t ucv;
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uc = &ucv;
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getcontext(uc);
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#endif
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if (curthread->deferred_siginfo.si_signo != 0) {
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act = curthread->deferred_sigact;
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uc->uc_sigmask = curthread->deferred_sigmask;
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memcpy(&info, &curthread->deferred_siginfo, sizeof(siginfo_t));
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/* remove signal */
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curthread->deferred_siginfo.si_signo = 0;
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if (act.sa_flags & SA_RESETHAND) {
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struct sigaction tact;
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tact = act;
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tact.sa_handler = SIG_DFL;
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_sigaction(info.si_signo, &tact, NULL);
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}
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handle_signal(&act, info.si_signo, &info, uc);
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}
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}
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static void
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check_suspend(struct pthread *curthread)
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{
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uint32_t cycle;
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if (__predict_true((curthread->flags &
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(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED))
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!= THR_FLAGS_NEED_SUSPEND))
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return;
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if (curthread == _single_thread)
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return;
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if (curthread->force_exit)
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return;
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/*
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* Blocks SIGCANCEL which other threads must send.
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*/
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_thr_signal_block(curthread);
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/*
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* Increase critical_count, here we don't use THR_LOCK/UNLOCK
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* because we are leaf code, we don't want to recursively call
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* ourself.
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*/
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curthread->critical_count++;
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THR_UMUTEX_LOCK(curthread, &(curthread)->lock);
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while ((curthread->flags & (THR_FLAGS_NEED_SUSPEND |
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THR_FLAGS_SUSPENDED)) == THR_FLAGS_NEED_SUSPEND) {
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curthread->cycle++;
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cycle = curthread->cycle;
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/* Wake the thread suspending us. */
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_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
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/*
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* if we are from pthread_exit, we don't want to
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* suspend, just go and die.
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*/
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if (curthread->state == PS_DEAD)
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break;
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curthread->flags |= THR_FLAGS_SUSPENDED;
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THR_UMUTEX_UNLOCK(curthread, &(curthread)->lock);
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_thr_umtx_wait_uint(&curthread->cycle, cycle, NULL, 0);
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THR_UMUTEX_LOCK(curthread, &(curthread)->lock);
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curthread->flags &= ~THR_FLAGS_SUSPENDED;
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}
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THR_UMUTEX_UNLOCK(curthread, &(curthread)->lock);
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curthread->critical_count--;
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_thr_signal_unblock(curthread);
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}
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void
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_thr_signal_init(void)
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{
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struct sigaction act;
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/* Install SIGCANCEL handler. */
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SIGFILLSET(act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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act.sa_sigaction = (__siginfohandler_t *)&sigcancel_handler;
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__sys_sigaction(SIGCANCEL, &act, NULL);
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/* Unblock SIGCANCEL */
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SIGEMPTYSET(act.sa_mask);
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SIGADDSET(act.sa_mask, SIGCANCEL);
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__sys_sigprocmask(SIG_UNBLOCK, &act.sa_mask, NULL);
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}
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void
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_thr_sigact_unload(struct dl_phdr_info *phdr_info)
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{
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#if 0
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struct pthread *curthread = _get_curthread();
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struct urwlock *rwlp;
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struct sigaction *actp;
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struct sigaction kact;
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void (*handler)(int);
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int sig;
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_thr_signal_block(curthread);
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for (sig = 1; sig <= _SIG_MAXSIG; sig++) {
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actp = &_thr_sigact[sig-1].sigact;
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retry:
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handler = actp->sa_handler;
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if (handler != SIG_DFL && handler != SIG_IGN &&
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__elf_phdr_match_addr(phdr_info, handler)) {
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rwlp = &_thr_sigact[sig-1].lock;
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_thr_rwl_wrlock(rwlp);
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if (handler != actp->sa_handler) {
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_thr_rwl_unlock(rwlp);
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goto retry;
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}
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actp->sa_handler = SIG_DFL;
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actp->sa_flags = SA_SIGINFO;
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SIGEMPTYSET(actp->sa_mask);
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if (__sys_sigaction(sig, NULL, &kact) == 0 &&
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kact.sa_handler != SIG_DFL &&
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kact.sa_handler != SIG_IGN)
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__sys_sigaction(sig, actp, NULL);
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_thr_rwl_unlock(rwlp);
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}
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}
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_thr_signal_unblock(curthread);
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#endif
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}
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void
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_thr_signal_prefork(void)
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{
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int i;
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for (i = 1; i <= _SIG_MAXSIG; ++i)
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_thr_rwl_rdlock(&_thr_sigact[i-1].lock);
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}
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void
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_thr_signal_postfork(void)
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{
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int i;
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for (i = 1; i <= _SIG_MAXSIG; ++i)
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_thr_rwl_unlock(&_thr_sigact[i-1].lock);
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}
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void
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_thr_signal_postfork_child(void)
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{
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int i;
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for (i = 1; i <= _SIG_MAXSIG; ++i)
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bzero(&_thr_sigact[i-1].lock, sizeof(struct urwlock));
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}
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void
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_thr_signal_deinit(void)
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{
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}
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__weak_reference(___pause, pause);
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int
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___pause(void)
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{
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sigset_t oset;
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if (_sigprocmask(SIG_BLOCK, NULL, &oset) == -1)
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return (-1);
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return (__sigsuspend(&oset));
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}
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__weak_reference(_raise, raise);
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int
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_raise(int sig)
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{
|
|
return _thr_send_sig(_get_curthread(), sig);
|
|
}
|
|
|
|
__weak_reference(_sigaction, sigaction);
|
|
|
|
int
|
|
_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
|
|
{
|
|
struct sigaction newact, oldact, oldact2;
|
|
sigset_t oldset;
|
|
int ret = 0, err = 0;
|
|
|
|
if (!_SIG_VALID(sig) || sig == SIGCANCEL) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
if (act)
|
|
newact = *act;
|
|
|
|
__sys_sigprocmask(SIG_SETMASK, &_thr_maskset, &oldset);
|
|
_thr_rwl_wrlock(&_thr_sigact[sig-1].lock);
|
|
|
|
if (act != NULL) {
|
|
oldact2 = _thr_sigact[sig-1].sigact;
|
|
|
|
/*
|
|
* if a new sig handler is SIG_DFL or SIG_IGN,
|
|
* don't remove old handler from _thr_sigact[],
|
|
* so deferred signals still can use the handlers,
|
|
* multiple threads invoking sigaction itself is
|
|
* a race condition, so it is not a problem.
|
|
*/
|
|
if (newact.sa_handler != SIG_DFL &&
|
|
newact.sa_handler != SIG_IGN) {
|
|
_thr_sigact[sig-1].sigact = newact;
|
|
remove_thr_signals(
|
|
&_thr_sigact[sig-1].sigact.sa_mask);
|
|
newact.sa_flags &= ~SA_NODEFER;
|
|
newact.sa_flags |= SA_SIGINFO;
|
|
newact.sa_sigaction = thr_sighandler;
|
|
newact.sa_mask = _thr_maskset; /* mask all signals */
|
|
}
|
|
if ((ret = __sys_sigaction(sig, &newact, &oldact))) {
|
|
err = errno;
|
|
_thr_sigact[sig-1].sigact = oldact2;
|
|
}
|
|
} else if (oact != NULL) {
|
|
ret = __sys_sigaction(sig, NULL, &oldact);
|
|
err = errno;
|
|
}
|
|
|
|
if (oldact.sa_handler != SIG_DFL &&
|
|
oldact.sa_handler != SIG_IGN) {
|
|
if (act != NULL)
|
|
oldact = oldact2;
|
|
else if (oact != NULL)
|
|
oldact = _thr_sigact[sig-1].sigact;
|
|
}
|
|
|
|
_thr_rwl_unlock(&_thr_sigact[sig-1].lock);
|
|
__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
|
|
|
|
if (ret == 0) {
|
|
if (oact != NULL)
|
|
*oact = oldact;
|
|
} else {
|
|
errno = err;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
__weak_reference(_sigprocmask, sigprocmask);
|
|
|
|
int
|
|
_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
|
|
{
|
|
const sigset_t *p = set;
|
|
sigset_t newset;
|
|
|
|
if (how != SIG_UNBLOCK) {
|
|
if (set != NULL) {
|
|
newset = *set;
|
|
SIGDELSET(newset, SIGCANCEL);
|
|
p = &newset;
|
|
}
|
|
}
|
|
return (__sys_sigprocmask(how, p, oset));
|
|
}
|
|
|
|
__weak_reference(_pthread_sigmask, pthread_sigmask);
|
|
|
|
int
|
|
_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
|
|
{
|
|
if (_sigprocmask(how, set, oset))
|
|
return (errno);
|
|
return (0);
|
|
}
|
|
|
|
__weak_reference(__sigsuspend, sigsuspend);
|
|
|
|
int
|
|
_sigsuspend(const sigset_t * set)
|
|
{
|
|
sigset_t newset;
|
|
|
|
return (__sys_sigsuspend(thr_remove_thr_signals(set, &newset)));
|
|
}
|
|
|
|
int
|
|
__sigsuspend(const sigset_t * set)
|
|
{
|
|
struct pthread *curthread;
|
|
sigset_t newset;
|
|
int ret, old;
|
|
|
|
curthread = _get_curthread();
|
|
|
|
old = curthread->in_sigsuspend;
|
|
curthread->in_sigsuspend = 1;
|
|
_thr_cancel_enter(curthread);
|
|
ret = __sys_sigsuspend(thr_remove_thr_signals(set, &newset));
|
|
_thr_cancel_leave(curthread, 1);
|
|
curthread->in_sigsuspend = old;
|
|
if (curthread->unblock_sigcancel) {
|
|
curthread->unblock_sigcancel = 0;
|
|
SIGEMPTYSET(newset);
|
|
SIGADDSET(newset, SIGCANCEL);
|
|
__sys_sigprocmask(SIG_UNBLOCK, &newset, NULL);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
__weak_reference(___sigwait, sigwait);
|
|
__weak_reference(__sigtimedwait, sigtimedwait);
|
|
__weak_reference(__sigwaitinfo, sigwaitinfo);
|
|
|
|
int
|
|
_sigtimedwait(const sigset_t *set, siginfo_t *info,
|
|
const struct timespec * timeout)
|
|
{
|
|
sigset_t newset;
|
|
|
|
return (__sys_sigtimedwait(thr_remove_thr_signals(set, &newset), info,
|
|
timeout));
|
|
}
|
|
|
|
/*
|
|
* Cancellation behavior:
|
|
* Thread may be canceled at start, if thread got signal,
|
|
* it is not canceled.
|
|
*/
|
|
int
|
|
__sigtimedwait(const sigset_t *set, siginfo_t *info,
|
|
const struct timespec * timeout)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
sigset_t newset;
|
|
int ret;
|
|
|
|
_thr_cancel_enter(curthread);
|
|
ret = __sys_sigtimedwait(thr_remove_thr_signals(set, &newset), info,
|
|
timeout);
|
|
_thr_cancel_leave(curthread, (ret == -1));
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
_sigwaitinfo(const sigset_t *set, siginfo_t *info)
|
|
{
|
|
sigset_t newset;
|
|
|
|
return (__sys_sigwaitinfo(thr_remove_thr_signals(set, &newset), info));
|
|
}
|
|
|
|
/*
|
|
* Cancellation behavior:
|
|
* Thread may be canceled at start, if thread got signal,
|
|
* it is not canceled.
|
|
*/
|
|
int
|
|
__sigwaitinfo(const sigset_t *set, siginfo_t *info)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
sigset_t newset;
|
|
int ret;
|
|
|
|
_thr_cancel_enter(curthread);
|
|
ret = __sys_sigwaitinfo(thr_remove_thr_signals(set, &newset), info);
|
|
_thr_cancel_leave(curthread, ret == -1);
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
_sigwait(const sigset_t *set, int *sig)
|
|
{
|
|
sigset_t newset;
|
|
|
|
return (__sys_sigwait(thr_remove_thr_signals(set, &newset), sig));
|
|
}
|
|
|
|
/*
|
|
* Cancellation behavior:
|
|
* Thread may be canceled at start, if thread got signal,
|
|
* it is not canceled.
|
|
*/
|
|
int
|
|
___sigwait(const sigset_t *set, int *sig)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
sigset_t newset;
|
|
int ret;
|
|
|
|
do {
|
|
_thr_cancel_enter(curthread);
|
|
ret = __sys_sigwait(thr_remove_thr_signals(set, &newset), sig);
|
|
_thr_cancel_leave(curthread, (ret != 0));
|
|
} while (ret == EINTR);
|
|
return (ret);
|
|
}
|
|
|
|
__weak_reference(_setcontext, setcontext);
|
|
int
|
|
_setcontext(const ucontext_t *ucp)
|
|
{
|
|
ucontext_t uc;
|
|
|
|
(void) memcpy(&uc, ucp, sizeof(uc));
|
|
remove_thr_signals(&uc.uc_sigmask);
|
|
return __sys_setcontext(&uc);
|
|
}
|
|
|
|
__weak_reference(_swapcontext, swapcontext);
|
|
int
|
|
_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
|
|
{
|
|
ucontext_t uc;
|
|
|
|
(void) memcpy(&uc, ucp, sizeof(uc));
|
|
remove_thr_signals(&uc.uc_sigmask);
|
|
return __sys_swapcontext(oucp, &uc);
|
|
}
|