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/* Copyright (C) 2003-2021 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 <https://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 <internaltypes.h>
#include <pthreadP.h>
#include "kernel-posix-timers.h"
#include "kernel-posix-cpu-timers.h"
#include <shlib-compat.h>
int
___timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
{
{
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;
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 = NULL;
evp = &local_evp;
}
kernel_timer_t ktimerid;
if (INLINE_SYSCALL_CALL (timer_create, syscall_clockid, evp,
&ktimerid) == -1)
return -1;
*timerid = kernel_timer_to_timerid (ktimerid);
}
else
{
/* Create the helper thread. */
__pthread_once (&__timer_helper_once, __timer_start_helper_thread);
if (__timer_helper_tid == 0)
{
/* No resources to start the helper thread. */
__set_errno (EAGAIN);
return -1;
}
struct timer *newp = 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;
/* We cannot simply copy the thread attributes since the
implementation might keep internal information for
each instance. */
__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. */
__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] = __timer_helper_tid } } };
/* Create the timer. */
int res;
res = INTERNAL_SYSCALL_CALL (timer_create, syscall_clockid, &sev,
&newp->ktimerid);
if (INTERNAL_SYSCALL_ERROR_P (res))
{
free (newp);
__set_errno (INTERNAL_SYSCALL_ERRNO (res));
return -1;
}
/* Add to the queue of active timers with thread delivery. */
__pthread_mutex_lock (&__timer_active_sigev_thread_lock);
newp->next = __timer_active_sigev_thread;
__timer_active_sigev_thread = newp;
__pthread_mutex_unlock (&__timer_active_sigev_thread_lock);
*timerid = timer_to_timerid (newp);
}
}
return 0;
}
versioned_symbol (libc, ___timer_create, timer_create, GLIBC_2_34);
libc_hidden_ver (___timer_create, __timer_create)
/* ABI transition from int to timer_t *. */
#if __WORDSIZE == 64 && OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)
compat_symbol (librt, ___timer_create, timer_create, GLIBC_2_3_3);
timer_t __timer_compat_list[OLD_TIMER_MAX];
int
__timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)
{
timer_t newp;
int res = __timer_create (clock_id, evp, &newp);
if (res == 0)
{
int i;
for (i = 0; i < OLD_TIMER_MAX; ++i)
if (__timer_compat_list[i] == NULL
&& ! atomic_compare_and_exchange_bool_acq (&__timer_compat_list[i],
newp, NULL))
{
*timerid = i;
break;
}
if (__glibc_unlikely (i == OLD_TIMER_MAX))
{
/* No free slot. */
(void) __timer_delete (newp);
__set_errno (EINVAL);
res = -1;
}
}
return res;
}
compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);
#else
/* The transition from int to timer_t did not change ABI because the
type sizes are the same. */
# if OTHER_SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_34)
compat_symbol (librt, ___timer_create, timer_create, GLIBC_2_2);
# endif
#endif
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