From 09402f5bc1d87787c84dbf75d41777c87b1ce40e Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 25 Mar 2003 20:41:26 +0000 Subject: Update. 2003-03-25 Ulrich Drepper * csu/tst-atomic.c: Adjust tests to what atomic_add_negative and atomic_add_zero were supposed to do. * include/atomic.h: Adjust atomic_add_negative and atomic_add_zero to x86 behavior. * sysdeps/generic/bits/typesizes.h (__TIMER_T_TYPE): Define as void*. This matches the new timer implementation. * sysdeps/unix/sysv/linux/bits/siginfo.h (struct siginfo): Adjust timer info for what the kernel provides these days. (struct sigevent): Add _tid field. Define SIGEV_THREAD_ID. * Versions.def (librt): Add GLIBC_2.3.3. * abilist/libpthread.abilist: Update for nptl. --- nptl/sysdeps/unix/sysv/linux/timer_create.c | 235 ++++++++++++++++++++++++++++ 1 file changed, 235 insertions(+) create mode 100644 nptl/sysdeps/unix/sysv/linux/timer_create.c (limited to 'nptl/sysdeps/unix/sysv/linux/timer_create.c') 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 , 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include "kernel-posix-timers.h" + + +#ifdef __NR_timer_create +# ifndef __ASSUME_POSIX_TIMERS +# define timer_create static compat_timer_create +# include +# 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 +#endif -- cgit 1.4.1