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04277e02d7
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177 lines
5.0 KiB
C
177 lines
5.0 KiB
C
/* Copyright (C) 2003-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sysdep.h>
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#include <internaltypes.h>
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#include <nptl/pthreadP.h>
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#include "kernel-posix-timers.h"
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#include "kernel-posix-cpu-timers.h"
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#ifdef timer_create_alias
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# define timer_create timer_create_alias
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#endif
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int
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timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
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{
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#undef timer_create
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{
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clockid_t syscall_clockid = (clock_id == CLOCK_PROCESS_CPUTIME_ID
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? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
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: clock_id == CLOCK_THREAD_CPUTIME_ID
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? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
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: clock_id);
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/* If the user wants notification via a thread we need to handle
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this special. */
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if (evp == NULL
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|| __builtin_expect (evp->sigev_notify != SIGEV_THREAD, 1))
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{
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struct sigevent local_evp;
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/* We avoid allocating too much memory by basically
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using struct timer as a derived class with the
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first two elements being in the superclass. We only
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need these two elements here. */
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struct timer *newp = (struct timer *) malloc (offsetof (struct timer,
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thrfunc));
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if (newp == NULL)
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/* No more memory. */
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return -1;
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if (evp == NULL)
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{
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/* The kernel has to pass up the timer ID which is a
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userlevel object. Therefore we cannot leave it up to
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the kernel to determine it. */
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local_evp.sigev_notify = SIGEV_SIGNAL;
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local_evp.sigev_signo = SIGALRM;
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local_evp.sigev_value.sival_ptr = newp;
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evp = &local_evp;
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}
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kernel_timer_t ktimerid;
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int retval = INLINE_SYSCALL (timer_create, 3, syscall_clockid, evp,
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&ktimerid);
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if (retval != -1)
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{
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newp->sigev_notify = (evp != NULL
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? evp->sigev_notify : SIGEV_SIGNAL);
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newp->ktimerid = ktimerid;
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*timerid = (timer_t) newp;
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}
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else
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{
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/* Cannot allocate the timer, fail. */
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free (newp);
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retval = -1;
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}
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return retval;
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}
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else
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{
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/* Create the helper thread. */
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pthread_once (&__helper_once, __start_helper_thread);
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if (__helper_tid == 0)
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{
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/* No resources to start the helper thread. */
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__set_errno (EAGAIN);
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return -1;
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}
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struct timer *newp;
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newp = (struct timer *) malloc (sizeof (struct timer));
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if (newp == NULL)
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return -1;
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/* Copy the thread parameters the user provided. */
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newp->sival = evp->sigev_value;
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newp->thrfunc = evp->sigev_notify_function;
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newp->sigev_notify = SIGEV_THREAD;
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/* We cannot simply copy the thread attributes since the
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implementation might keep internal information for
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each instance. */
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(void) pthread_attr_init (&newp->attr);
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if (evp->sigev_notify_attributes != NULL)
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{
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struct pthread_attr *nattr;
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struct pthread_attr *oattr;
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nattr = (struct pthread_attr *) &newp->attr;
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oattr = (struct pthread_attr *) evp->sigev_notify_attributes;
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nattr->schedparam = oattr->schedparam;
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nattr->schedpolicy = oattr->schedpolicy;
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nattr->flags = oattr->flags;
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nattr->guardsize = oattr->guardsize;
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nattr->stackaddr = oattr->stackaddr;
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nattr->stacksize = oattr->stacksize;
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}
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/* In any case set the detach flag. */
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(void) pthread_attr_setdetachstate (&newp->attr,
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PTHREAD_CREATE_DETACHED);
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/* Create the event structure for the kernel timer. */
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struct sigevent sev =
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{ .sigev_value.sival_ptr = newp,
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.sigev_signo = SIGTIMER,
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.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID,
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._sigev_un = { ._pad = { [0] = __helper_tid } } };
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/* Create the timer. */
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INTERNAL_SYSCALL_DECL (err);
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int res;
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res = INTERNAL_SYSCALL (timer_create, err, 3,
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syscall_clockid, &sev, &newp->ktimerid);
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if (! INTERNAL_SYSCALL_ERROR_P (res, err))
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{
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/* Add to the queue of active timers with thread
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delivery. */
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pthread_mutex_lock (&__active_timer_sigev_thread_lock);
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newp->next = __active_timer_sigev_thread;
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__active_timer_sigev_thread = newp;
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pthread_mutex_unlock (&__active_timer_sigev_thread_lock);
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*timerid = (timer_t) newp;
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return 0;
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}
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/* Free the resources. */
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free (newp);
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__set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
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return -1;
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}
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}
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}
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