1 /* Copyright (C) 2003,2004, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
27 #include <kernel-features.h>
28 #include <internaltypes.h>
29 #include <nptl/pthreadP.h>
30 #include "kernel-posix-timers.h"
31 #include "kernel-posix-cpu-timers.h"
34 #ifdef __NR_timer_create
35 # ifndef __ASSUME_POSIX_TIMERS
36 static int compat_timer_create (clockid_t clock_id
, struct sigevent
*evp
,
38 # define timer_create static compat_timer_create
39 # include <nptl/sysdeps/pthread/timer_create.c>
42 /* Nonzero if the system calls are not available. */
43 int __no_posix_timers attribute_hidden
;
46 # ifdef timer_create_alias
47 # define timer_create timer_create_alias
52 timer_create (clock_id
, evp
, timerid
)
58 # ifndef __ASSUME_POSIX_TIMERS
59 if (__no_posix_timers
>= 0)
62 clockid_t syscall_clockid
= (clock_id
== CLOCK_PROCESS_CPUTIME_ID
63 ? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED
)
64 : clock_id
== CLOCK_THREAD_CPUTIME_ID
65 ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED
)
68 /* If the user wants notification via a thread we need to handle
71 || __builtin_expect (evp
->sigev_notify
!= SIGEV_THREAD
, 1))
73 struct sigevent local_evp
;
75 /* We avoid allocating too much memory by basically
76 using struct timer as a derived class with the
77 first two elements being in the superclass. We only
78 need these two elements here. */
79 struct timer
*newp
= (struct timer
*) malloc (offsetof (struct timer
,
87 /* The kernel has to pass up the timer ID which is a
88 userlevel object. Therefore we cannot leave it up to
89 the kernel to determine it. */
90 local_evp
.sigev_notify
= SIGEV_SIGNAL
;
91 local_evp
.sigev_signo
= SIGALRM
;
92 local_evp
.sigev_value
.sival_ptr
= newp
;
97 kernel_timer_t ktimerid
;
98 int retval
= INLINE_SYSCALL (timer_create
, 3, syscall_clockid
, evp
,
101 # ifndef __ASSUME_POSIX_TIMERS
102 if (retval
!= -1 || errno
!= ENOSYS
)
105 # ifndef __ASSUME_POSIX_TIMERS
106 __no_posix_timers
= 1;
111 newp
->sigev_notify
= (evp
!= NULL
112 ? evp
->sigev_notify
: SIGEV_SIGNAL
);
113 newp
->ktimerid
= ktimerid
;
115 *timerid
= (timer_t
) newp
;
119 /* Cannot allocate the timer, fail. */
129 # ifndef __ASSUME_POSIX_TIMERS
130 /* When we come here the syscall does not exist. Make sure we
131 do not try to use it again. */
132 __no_posix_timers
= -1;
137 # ifndef __ASSUME_POSIX_TIMERS
138 /* Make sure we have the necessary kernel support. */
139 if (__no_posix_timers
== 0)
141 INTERNAL_SYSCALL_DECL (err
);
144 res
= INTERNAL_SYSCALL (clock_getres
, err
, 2,
145 CLOCK_REALTIME
, &ts
);
146 __no_posix_timers
= (INTERNAL_SYSCALL_ERROR_P (res
, err
)
150 if (__no_posix_timers
> 0)
153 /* Create the helper thread. */
154 pthread_once (&__helper_once
, __start_helper_thread
);
155 if (__helper_tid
== 0)
157 /* No resources to start the helper thread. */
158 __set_errno (EAGAIN
);
163 newp
= (struct timer
*) malloc (sizeof (struct timer
));
167 /* Copy the thread parameters the user provided. */
168 newp
->sival
= evp
->sigev_value
;
169 newp
->thrfunc
= evp
->sigev_notify_function
;
171 /* We cannot simply copy the thread attributes since the
172 implementation might keep internal information for
174 (void) pthread_attr_init (&newp
->attr
);
175 if (evp
->sigev_notify_attributes
!= NULL
)
177 struct pthread_attr
*nattr
;
178 struct pthread_attr
*oattr
;
180 nattr
= (struct pthread_attr
*) &newp
->attr
;
181 oattr
= (struct pthread_attr
*) evp
->sigev_notify_attributes
;
183 nattr
->schedparam
= oattr
->schedparam
;
184 nattr
->schedpolicy
= oattr
->schedpolicy
;
185 nattr
->flags
= oattr
->flags
;
186 nattr
->guardsize
= oattr
->guardsize
;
187 nattr
->stackaddr
= oattr
->stackaddr
;
188 nattr
->stacksize
= oattr
->stacksize
;
191 /* In any case set the detach flag. */
192 (void) pthread_attr_setdetachstate (&newp
->attr
,
193 PTHREAD_CREATE_DETACHED
);
195 /* Create the event structure for the kernel timer. */
196 struct sigevent sev
=
197 { .sigev_value
.sival_ptr
= newp
,
198 .sigev_signo
= SIGTIMER
,
199 .sigev_notify
= SIGEV_SIGNAL
| SIGEV_THREAD_ID
,
200 ._sigev_un
= { ._pad
= { [0] = __helper_tid
} } };
202 /* Create the timer. */
203 INTERNAL_SYSCALL_DECL (err
);
205 res
= INTERNAL_SYSCALL (timer_create
, err
, 3,
206 syscall_clockid
, &sev
, &newp
->ktimerid
);
207 if (! INTERNAL_SYSCALL_ERROR_P (res
, err
))
209 /* Add to the queue of active timers with thread
211 pthread_mutex_lock (&__active_timer_sigev_thread_lock
);
212 newp
->next
= __active_timer_sigev_thread
;
213 __active_timer_sigev_thread
= newp
;
214 pthread_mutex_unlock (&__active_timer_sigev_thread_lock
);
216 *timerid
= (timer_t
) newp
;
220 /* Free the resources. */
223 __set_errno (INTERNAL_SYSCALL_ERRNO (res
, err
));
230 # ifndef __ASSUME_POSIX_TIMERS
231 /* Compatibility code. */
232 return compat_timer_create (clock_id
, evp
, timerid
);
236 # ifdef timer_create_alias
237 # define timer_create timer_create_alias
239 /* The new system calls are not available. Use the userlevel
241 # include <nptl/sysdeps/pthread/timer_create.c>