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Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/timer_create.c')
-rw-r--r--nptl/sysdeps/unix/sysv/linux/timer_create.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/timer_create.c b/nptl/sysdeps/unix/sysv/linux/timer_create.c
new file mode 100644
index 0000000000..637d925168
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/timer_create.c
@@ -0,0 +1,235 @@
+/* Copyright (C) 2003 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 <errno.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sysdep.h>
+#include <kernel-features.h>
+#include <internaltypes.h>
+#include "kernel-posix-timers.h"
+
+
+#ifdef __NR_timer_create
+# ifndef __ASSUME_POSIX_TIMERS
+# 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 (clock_id, evp, timerid)
+ clockid_t clock_id;
+ struct sigevent *evp;
+ timer_t *timerid;
+{
+# undef timer_create
+# ifndef __ASSUME_POSIX_TIMERS
+ if (__no_posix_timers >= 0)
+# endif
+ {
+ /* 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))
+ {
+ kernel_timer_t ktimerid;
+ int retval = INLINE_SYSCALL (timer_create, 3, clock_id, evp,
+ &ktimerid);
+
+# ifndef __ASSUME_POSIX_TIMERS
+ if (retval != -1 || errno != ENOSYS)
+# endif
+ {
+# ifndef __ASSUME_POSIX_TIMERS
+ __no_posix_timers = 1;
+#endif
+
+ if (retval != -1)
+ {
+ struct timer *newp;
+
+ /* 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. */
+ newp = (struct timer *) malloc (offsetof (struct timer,
+ thrfunc));
+ if (newp != NULL)
+ {
+ newp->sigev_notify = (evp != NULL
+ ? evp->sigev_notify
+ : SIGEV_SIGNAL);
+ newp->ktimerid = ktimerid;
+
+ *timerid = (timer_t) newp;
+ }
+ else
+ {
+ /* No memory. Free the kernel timer. */
+ INTERNAL_SYSCALL_DECL (err);
+ (void) INTERNAL_SYSCALL (timer_delete, err, 1, ktimerid);
+
+ retval = -1;
+ }
+ }
+
+ return retval;
+ }
+ }
+ 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 = INTERNAL_SYSCALL (clock_getres, err, 1, &ts);
+ __no_posix_timers = (INTERNAL_SYSCALL_ERROR_P (res, err)
+ ? -1 : 1);
+ }
+
+ if (__no_posix_timers > 0)
+#endif
+ {
+ sigset_t ss;
+ sigemptyset (&ss);
+ sigaddset (&ss, TIMER_SIG);
+ pthread_sigmask (SIG_BLOCK, &ss, NULL);
+ 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;
+
+ /* 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);
+
+ /* Set up the barrier for sychronization. */
+ (void) pthread_barrier_init (&newp->bar, NULL, 2);
+
+ /* The helper thread needs only very little resources
+ and should go away automatically when canceled. */
+ pthread_attr_t attr;
+ (void) pthread_attr_init (&attr);
+ (void) pthread_attr_setdetachstate (&attr,
+ PTHREAD_CREATE_DETACHED);
+ (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
+
+ /* Create the helper thread for this timer. */
+ int res = pthread_create (&newp->th, &attr,
+ __timer_helper_thread, newp);
+ if (res != 0)
+ goto err_out;
+
+ /* No need for the attribute anymore. */
+ (void) pthread_attr_destroy (&attr);
+
+ /* Create the event structure for the kernel timer. */
+ struct sigevent sev;
+ sev.sigev_value.sival_ptr = newp;
+ sev.sigev_signo = TIMER_SIG;
+ sev.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID;
+ /* This is the thread ID of the helper thread. */
+ sev._sigev_un._pad[0] = ((struct pthread *) newp->th)->tid;
+
+ /* Wait until the helper thread is set up. */
+ (void) pthread_barrier_wait (&newp->bar);
+
+ /* No need for the barrier anymore. */
+ (void) pthread_barrier_destroy (&newp->bar);
+
+ /* Create the timer. */
+ INTERNAL_SYSCALL_DECL (err);
+ res = INTERNAL_SYSCALL (timer_create, err, 3, clock_id, &sev,
+ &newp->ktimerid);
+ if (! INTERNAL_SYSCALL_ERROR_P (res, err))
+ {
+ *timerid = (timer_t) newp;
+ return 0;
+ }
+
+ /* Something went wrong. Kill the thread. */
+ pthread_cancel (newp->th);
+ /* Free the resources. */
+ res = INTERNAL_SYSCALL_ERRNO (res, err);
+ err_out:
+ free (newp);
+ __set_errno (res);
+ return -1;
+ }
+ }
+
+# 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
+ }
+
+# 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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