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- /* Copyright (C) 2003,2004, 2007, 2009 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, see <http://www.gnu.org/licenses/>. */
- #include <errno.h>
- #include <pthread.h>
- #include <signal.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <sysdep.h>
- #include <bits/kernel-features.h>
- #include <internaltypes.h>
- #include <pthreadP.h>
- #include "kernel-posix-timers.h"
- #include "kernel-posix-cpu-timers.h"
- #ifdef __NR_timer_create
- # ifndef __ASSUME_POSIX_TIMERS
- static int compat_timer_create (clockid_t clock_id, struct sigevent *evp,
- timer_t *timerid);
- # define timer_create static compat_timer_create
- # include <nptl/sysdeps/pthread/timer_create.c>
- # undef timer_create
- /* Nonzero if the system calls are not available. */
- int __no_posix_timers attribute_hidden;
- # endif
- # ifdef timer_create_alias
- # define timer_create timer_create_alias
- # endif
- int
- timer_create (
- clockid_t clock_id,
- struct sigevent *evp,
- timer_t *timerid)
- {
- # undef timer_create
- # ifndef __ASSUME_POSIX_TIMERS
- if (__no_posix_timers >= 0)
- # endif
- {
- clockid_t syscall_clockid = (clock_id == CLOCK_PROCESS_CPUTIME_ID
- ? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
- : clock_id == CLOCK_THREAD_CPUTIME_ID
- ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
- : clock_id);
- /* If the user wants notification via a thread we need to handle
- this special. */
- if (evp == NULL
- || __builtin_expect (evp->sigev_notify != SIGEV_THREAD, 1))
- {
- struct sigevent local_evp;
- /* We avoid allocating too much memory by basically
- using struct timer as a derived class with the
- first two elements being in the superclass. We only
- need these two elements here. */
- struct timer *newp = (struct timer *) malloc (offsetof (struct timer,
- thrfunc));
- if (newp == NULL)
- /* No more memory. */
- return -1;
- if (evp == NULL)
- {
- /* The kernel has to pass up the timer ID which is a
- userlevel object. Therefore we cannot leave it up to
- the kernel to determine it. */
- local_evp.sigev_notify = SIGEV_SIGNAL;
- local_evp.sigev_signo = SIGALRM;
- local_evp.sigev_value.sival_ptr = newp;
- evp = &local_evp;
- }
- kernel_timer_t ktimerid;
- int retval = INLINE_SYSCALL (timer_create, 3, syscall_clockid, evp,
- &ktimerid);
- # ifndef __ASSUME_POSIX_TIMERS
- if (retval != -1 || errno != ENOSYS)
- # endif
- {
- # ifndef __ASSUME_POSIX_TIMERS
- __no_posix_timers = 1;
- # endif
- if (retval != -1)
- {
- newp->sigev_notify = (evp != NULL
- ? evp->sigev_notify : SIGEV_SIGNAL);
- newp->ktimerid = ktimerid;
- *timerid = (timer_t) newp;
- }
- else
- {
- /* Cannot allocate the timer, fail. */
- free (newp);
- retval = -1;
- }
- return retval;
- }
- free (newp);
- # ifndef __ASSUME_POSIX_TIMERS
- /* When we come here the syscall does not exist. Make sure we
- do not try to use it again. */
- __no_posix_timers = -1;
- # endif
- }
- else
- {
- # ifndef __ASSUME_POSIX_TIMERS
- /* Make sure we have the necessary kernel support. */
- if (__no_posix_timers == 0)
- {
- INTERNAL_SYSCALL_DECL (err);
- struct timespec ts;
- int res;
- #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_getres_time64)
- res = INTERNAL_SYSCALL (clock_getres_time64, err, 2,
- CLOCK_REALTIME, &ts);
- #else
- res = INTERNAL_SYSCALL (clock_getres, err, 2,
- CLOCK_REALTIME, &ts);
- #endif
- __no_posix_timers = (INTERNAL_SYSCALL_ERROR_P (res, err)
- ? -1 : 1);
- }
- if (__no_posix_timers > 0)
- # endif
- {
- /* Create the helper thread. */
- pthread_once (&__helper_once, __start_helper_thread);
- if (__helper_tid == 0)
- {
- /* No resources to start the helper thread. */
- __set_errno (EAGAIN);
- return -1;
- }
- struct timer *newp;
- newp = (struct timer *) malloc (sizeof (struct timer));
- if (newp == NULL)
- return -1;
- /* Copy the thread parameters the user provided. */
- newp->sival = evp->sigev_value;
- newp->thrfunc = evp->sigev_notify_function;
- newp->sigev_notify = SIGEV_THREAD;
- /* We cannot simply copy the thread attributes since the
- implementation might keep internal information for
- each instance. */
- (void) pthread_attr_init (&newp->attr);
- if (evp->sigev_notify_attributes != NULL)
- {
- struct pthread_attr *nattr;
- struct pthread_attr *oattr;
- nattr = (struct pthread_attr *) &newp->attr;
- oattr = (struct pthread_attr *) evp->sigev_notify_attributes;
- nattr->schedparam = oattr->schedparam;
- nattr->schedpolicy = oattr->schedpolicy;
- nattr->flags = oattr->flags;
- nattr->guardsize = oattr->guardsize;
- nattr->stackaddr = oattr->stackaddr;
- nattr->stacksize = oattr->stacksize;
- }
- /* In any case set the detach flag. */
- (void) pthread_attr_setdetachstate (&newp->attr,
- PTHREAD_CREATE_DETACHED);
- /* Create the event structure for the kernel timer. */
- struct sigevent sev =
- { .sigev_value.sival_ptr = newp,
- .sigev_signo = SIGTIMER,
- .sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID,
- ._sigev_un = { ._pad = { [0] = __helper_tid } } };
- /* Create the timer. */
- INTERNAL_SYSCALL_DECL (err);
- int res;
- res = INTERNAL_SYSCALL (timer_create, err, 3,
- syscall_clockid, &sev, &newp->ktimerid);
- if (! INTERNAL_SYSCALL_ERROR_P (res, err))
- {
- /* Add to the queue of active timers with thread
- delivery. */
- pthread_mutex_lock (&__active_timer_sigev_thread_lock);
- newp->next = __active_timer_sigev_thread;
- __active_timer_sigev_thread = newp;
- pthread_mutex_unlock (&__active_timer_sigev_thread_lock);
- *timerid = (timer_t) newp;
- return 0;
- }
- /* Free the resources. */
- free (newp);
- __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
- return -1;
- }
- }
- }
- # ifndef __ASSUME_POSIX_TIMERS
- /* Compatibility code. */
- return compat_timer_create (clock_id, evp, timerid);
- # endif
- }
- #else
- # ifdef timer_create_alias
- # define timer_create timer_create_alias
- # endif
- /* The new system calls are not available. Use the userlevel
- implementation. */
- # include <nptl/sysdeps/pthread/timer_create.c>
- #endif
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