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/* Copyright (C) 2003, 2007, 2012 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,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <sys/types.h>
/* Nonzero if the system calls are not available. */
extern int __no_posix_timers attribute_hidden;
/* Callback to start helper thread. */
extern void __start_helper_thread (void) attribute_hidden;
/* Control variable for helper thread creation. */
extern pthread_once_t __helper_once attribute_hidden;
/* TID of the helper thread. */
extern pid_t __helper_tid attribute_hidden;
/* List of active SIGEV_THREAD timers. */
extern struct timer *__active_timer_sigev_thread attribute_hidden;
/* Lock for the __active_timer_sigev_thread. */
extern pthread_mutex_t __active_timer_sigev_thread_lock attribute_hidden;
/* Type of timers in the kernel. */
typedef int kernel_timer_t;
/* Internal representation of timer. */
struct timer
{
/* Notification mechanism. */
int sigev_notify;
/* Timer ID returned by the kernel. */
kernel_timer_t ktimerid;
/* All new elements must be added after ktimerid. And if the thrfunc
element is not the third element anymore the memory allocation in
timer_create needs to be changed. */
/* Parameters for the thread to be started for SIGEV_THREAD. */
void (*thrfunc) (sigval_t);
sigval_t sival;
pthread_attr_t attr;
/* Next element in list of active SIGEV_THREAD timers. */
struct timer *next;
};
extern struct timer *__all_timers[TIMER_MAX];
static inline struct timer *
__kfreebsd_timer_alloc (void)
{
unsigned int i;
struct timer *timer = malloc (sizeof (struct timer));
if (timer == NULL)
goto fail;
/* Find a free slot (and reserve it atomically). */
for (i = 0; i < TIMER_MAX; i++)
if (atomic_compare_and_exchange_val_acq (&__all_timers[i],
timer, NULL) == NULL)
return timer;
free (timer);
fail:
errno = EAGAIN;
return NULL;
}
static inline struct timer *
__kfreebsd_timer_id2ptr (timer_t id)
{
void *ret = NULL;
if (id >= 0 && id < TIMER_MAX)
ret = __all_timers[id];
if (! ret)
errno = EINVAL;
return ret;
}
static inline timer_t
__kfreebsd_timer_ptr2id (struct timer *ptr)
{
unsigned int i;
for (i = 0; i < TIMER_MAX; i++)
if (__all_timers[i] == ptr)
return i;
return -1;
}
void static inline
__kfreebsd_timer_free (struct timer *ptr)
{
__all_timers[__kfreebsd_timer_ptr2id (ptr)] = NULL;
free (ptr);
}
/* used syscalls */
int __syscall_ktimer_create (clockid_t clockid, struct sigevent *evp, kernel_timer_t *timerid);
int __syscall_ktimer_delete (kernel_timer_t timerid);
int __syscall_ktimer_getoverrun (kernel_timer_t timerid);
int __syscall_ktimer_gettime (kernel_timer_t timerid, struct itimerspec *value);
int __syscall_ktimer_settime (kernel_timer_t timerid, int flags, const struct itimerspec *value, struct itimerspec *ovalue);
libc_hidden_proto (__syscall_ktimer_create)
libc_hidden_proto (__syscall_ktimer_delete)
libc_hidden_proto (__syscall_ktimer_getoverrun)
libc_hidden_proto (__syscall_ktimer_gettime)
libc_hidden_proto (__syscall_ktimer_settime)
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