1 /* Copyright (C) 2003,2004 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"
33 #ifdef __NR_timer_create
34 # ifndef __ASSUME_POSIX_TIMERS
35 static int compat_timer_create (clockid_t clock_id, struct sigevent *evp,
37 # define timer_create static compat_timer_create
38 # include <nptl/sysdeps/pthread/timer_create.c>
41 /* Nonzero if the system calls are not available. */
42 int __no_posix_timers attribute_hidden;
45 # ifdef timer_create_alias
46 # define timer_create timer_create_alias
51 timer_create (clock_id, evp, timerid)
57 # ifndef __ASSUME_POSIX_TIMERS
58 if (__no_posix_timers >= 0)
61 /* If the user wants notification via a thread we need to handle
64 || __builtin_expect (evp->sigev_notify != SIGEV_THREAD, 1))
66 struct sigevent local_evp;
68 /* We avoid allocating too much memory by basically
69 using struct timer as a derived class with the
70 first two elements being in the superclass. We only
71 need these two elements here. */
72 struct timer *newp = (struct timer *) malloc (offsetof (struct timer,
80 /* The kernel has to pass up the timer ID which is a
81 userlevel object. Therefore we cannot leave it up to
82 the kernel to determine it. */
83 local_evp.sigev_notify = SIGEV_SIGNAL;
84 local_evp.sigev_signo = SIGALRM;
85 local_evp.sigev_value.sival_ptr = newp;
90 kernel_timer_t ktimerid;
91 int retval = INLINE_SYSCALL (timer_create, 3, clock_id, evp,
94 # ifndef __ASSUME_POSIX_TIMERS
95 if (retval != -1 || errno != ENOSYS)
98 # ifndef __ASSUME_POSIX_TIMERS
99 __no_posix_timers = 1;
104 newp->sigev_notify = (evp != NULL
105 ? evp->sigev_notify : SIGEV_SIGNAL);
106 newp->ktimerid = ktimerid;
108 *timerid = (timer_t) newp;
112 /* Cannot allocate the timer, fail. */
122 # ifndef __ASSUME_POSIX_TIMERS
123 /* When we come here the syscall does not exist. Make sure we
124 do not try to use it again. */
125 __no_posix_timers = -1;
130 # ifndef __ASSUME_POSIX_TIMERS
131 /* Make sure we have the necessary kernel support. */
132 if (__no_posix_timers == 0)
134 INTERNAL_SYSCALL_DECL (err);
137 res = INTERNAL_SYSCALL (clock_getres, err, 2,
138 CLOCK_REALTIME, &ts);
139 __no_posix_timers = (INTERNAL_SYSCALL_ERROR_P (res, err)
143 if (__no_posix_timers > 0)
146 /* Create the helper thread. */
147 pthread_once (&__helper_once, __start_helper_thread);
148 if (__helper_tid == 0)
150 /* No resources to start the helper thread. */
151 __set_errno (EAGAIN);
156 newp = (struct timer *) malloc (sizeof (struct timer));
160 /* Copy the thread parameters the user provided. */
161 newp->sival = evp->sigev_value;
162 newp->thrfunc = evp->sigev_notify_function;
164 /* We cannot simply copy the thread attributes since the
165 implementation might keep internal information for
167 (void) pthread_attr_init (&newp->attr);
168 if (evp->sigev_notify_attributes != NULL)
170 struct pthread_attr *nattr;
171 struct pthread_attr *oattr;
173 nattr = (struct pthread_attr *) &newp->attr;
174 oattr = (struct pthread_attr *) evp->sigev_notify_attributes;
176 nattr->schedparam = oattr->schedparam;
177 nattr->schedpolicy = oattr->schedpolicy;
178 nattr->flags = oattr->flags;
179 nattr->guardsize = oattr->guardsize;
180 nattr->stackaddr = oattr->stackaddr;
181 nattr->stacksize = oattr->stacksize;
184 /* In any case set the detach flag. */
185 (void) pthread_attr_setdetachstate (&newp->attr,
186 PTHREAD_CREATE_DETACHED);
188 /* Create the event structure for the kernel timer. */
190 sev.sigev_value.sival_ptr = newp;
191 sev.sigev_signo = SIGTIMER;
192 sev.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID;
193 /* This is the thread ID of the helper thread. */
194 sev._sigev_un._pad[0] = __helper_tid;
196 /* Create the timer. */
197 INTERNAL_SYSCALL_DECL (err);
199 res = INTERNAL_SYSCALL (timer_create, err, 3, clock_id, &sev,
201 if (! INTERNAL_SYSCALL_ERROR_P (res, err))
203 *timerid = (timer_t) newp;
207 /* Free the resources. */
210 __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
217 # ifndef __ASSUME_POSIX_TIMERS
218 /* Compatibility code. */
219 return compat_timer_create (clock_id, evp, timerid);
223 # ifdef timer_create_alias
224 # define timer_create timer_create_alias
226 /* The new system calls are not available. Use the userlevel
228 # include <nptl/sysdeps/pthread/timer_create.c>