diff options
Diffstat (limited to 'nptl/pthread_cond_timedwait.c')
| -rw-r--r-- | nptl/pthread_cond_timedwait.c | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/nptl/pthread_cond_timedwait.c b/nptl/pthread_cond_timedwait.c deleted file mode 100644 index 711a51de20..0000000000 --- a/nptl/pthread_cond_timedwait.c +++ /dev/null @@ -1,268 +0,0 @@ -/* Copyright (C) 2003-2016 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Martin Schwidefsky <schwidefsky@de.ibm.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; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <endian.h> -#include <errno.h> -#include <sysdep.h> -#include <lowlevellock.h> -#include <pthread.h> -#include <pthreadP.h> -#include <sys/time.h> -#include <kernel-features.h> - -#include <shlib-compat.h> - -#ifndef HAVE_CLOCK_GETTIME_VSYSCALL -# undef INTERNAL_VSYSCALL -# define INTERNAL_VSYSCALL INTERNAL_SYSCALL -# undef INLINE_VSYSCALL -# define INLINE_VSYSCALL INLINE_SYSCALL -#else -# include <libc-vdso.h> -#endif - -/* Cleanup handler, defined in pthread_cond_wait.c. */ -extern void __condvar_cleanup (void *arg) - __attribute__ ((visibility ("hidden"))); - -struct _condvar_cleanup_buffer -{ - int oldtype; - pthread_cond_t *cond; - pthread_mutex_t *mutex; - unsigned int bc_seq; -}; - -int -__pthread_cond_timedwait (pthread_cond_t *cond, pthread_mutex_t *mutex, - const struct timespec *abstime) -{ - struct _pthread_cleanup_buffer buffer; - struct _condvar_cleanup_buffer cbuffer; - int result = 0; - - /* Catch invalid parameters. */ - if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) - return EINVAL; - - int pshared = (cond->__data.__mutex == (void *) ~0l) - ? LLL_SHARED : LLL_PRIVATE; - -#if (defined lll_futex_timed_wait_requeue_pi \ - && defined __ASSUME_REQUEUE_PI) - int pi_flag = 0; -#endif - - /* Make sure we are alone. */ - lll_lock (cond->__data.__lock, pshared); - - /* Now we can release the mutex. */ - int err = __pthread_mutex_unlock_usercnt (mutex, 0); - if (err) - { - lll_unlock (cond->__data.__lock, pshared); - return err; - } - - /* We have one new user of the condvar. */ - ++cond->__data.__total_seq; - ++cond->__data.__futex; - cond->__data.__nwaiters += 1 << COND_NWAITERS_SHIFT; - - /* Work around the fact that the kernel rejects negative timeout values - despite them being valid. */ - if (__glibc_unlikely (abstime->tv_sec < 0)) - goto timeout; - - /* Remember the mutex we are using here. If there is already a - different address store this is a bad user bug. Do not store - anything for pshared condvars. */ - if (cond->__data.__mutex != (void *) ~0l) - cond->__data.__mutex = mutex; - - /* Prepare structure passed to cancellation handler. */ - cbuffer.cond = cond; - cbuffer.mutex = mutex; - - /* Before we block we enable cancellation. Therefore we have to - install a cancellation handler. */ - __pthread_cleanup_push (&buffer, __condvar_cleanup, &cbuffer); - - /* The current values of the wakeup counter. The "woken" counter - must exceed this value. */ - unsigned long long int val; - unsigned long long int seq; - val = seq = cond->__data.__wakeup_seq; - /* Remember the broadcast counter. */ - cbuffer.bc_seq = cond->__data.__broadcast_seq; - - while (1) - { -#if (!defined __ASSUME_FUTEX_CLOCK_REALTIME \ - || !defined lll_futex_timed_wait_bitset) - struct timespec rt; - { -# ifdef __NR_clock_gettime - INTERNAL_SYSCALL_DECL (err); - (void) INTERNAL_VSYSCALL (clock_gettime, err, 2, - (cond->__data.__nwaiters - & ((1 << COND_NWAITERS_SHIFT) - 1)), - &rt); - /* Convert the absolute timeout value to a relative timeout. */ - rt.tv_sec = abstime->tv_sec - rt.tv_sec; - rt.tv_nsec = abstime->tv_nsec - rt.tv_nsec; -# else - /* Get the current time. So far we support only one clock. */ - struct timeval tv; - (void) __gettimeofday (&tv, NULL); - - /* Convert the absolute timeout value to a relative timeout. */ - rt.tv_sec = abstime->tv_sec - tv.tv_sec; - rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; -# endif - } - if (rt.tv_nsec < 0) - { - rt.tv_nsec += 1000000000; - --rt.tv_sec; - } - /* Did we already time out? */ - if (__glibc_unlikely (rt.tv_sec < 0)) - { - if (cbuffer.bc_seq != cond->__data.__broadcast_seq) - goto bc_out; - - goto timeout; - } -#endif - - unsigned int futex_val = cond->__data.__futex; - - /* Prepare to wait. Release the condvar futex. */ - lll_unlock (cond->__data.__lock, pshared); - - /* Enable asynchronous cancellation. Required by the standard. */ - cbuffer.oldtype = __pthread_enable_asynccancel (); - -/* REQUEUE_PI was implemented after FUTEX_CLOCK_REALTIME, so it is sufficient - to check just the former. */ -#if (defined lll_futex_timed_wait_requeue_pi \ - && defined __ASSUME_REQUEUE_PI) - /* If pi_flag remained 1 then it means that we had the lock and the mutex - but a spurious waker raced ahead of us. Give back the mutex before - going into wait again. */ - if (pi_flag) - { - __pthread_mutex_cond_lock_adjust (mutex); - __pthread_mutex_unlock_usercnt (mutex, 0); - } - pi_flag = USE_REQUEUE_PI (mutex); - - if (pi_flag) - { - unsigned int clockbit = (cond->__data.__nwaiters & 1 - ? 0 : FUTEX_CLOCK_REALTIME); - err = lll_futex_timed_wait_requeue_pi (&cond->__data.__futex, - futex_val, abstime, clockbit, - &mutex->__data.__lock, - pshared); - pi_flag = (err == 0); - } - else -#endif - - { -#if (!defined __ASSUME_FUTEX_CLOCK_REALTIME \ - || !defined lll_futex_timed_wait_bitset) - /* Wait until woken by signal or broadcast. */ - err = lll_futex_timed_wait (&cond->__data.__futex, - futex_val, &rt, pshared); -#else - unsigned int clockbit = (cond->__data.__nwaiters & 1 - ? 0 : FUTEX_CLOCK_REALTIME); - err = lll_futex_timed_wait_bitset (&cond->__data.__futex, futex_val, - abstime, clockbit, pshared); -#endif - } - - /* Disable asynchronous cancellation. */ - __pthread_disable_asynccancel (cbuffer.oldtype); - - /* We are going to look at shared data again, so get the lock. */ - lll_lock (cond->__data.__lock, pshared); - - /* If a broadcast happened, we are done. */ - if (cbuffer.bc_seq != cond->__data.__broadcast_seq) - goto bc_out; - - /* Check whether we are eligible for wakeup. */ - val = cond->__data.__wakeup_seq; - if (val != seq && cond->__data.__woken_seq != val) - break; - - /* Not woken yet. Maybe the time expired? */ - if (__glibc_unlikely (err == -ETIMEDOUT)) - { - timeout: - /* Yep. Adjust the counters. */ - ++cond->__data.__wakeup_seq; - ++cond->__data.__futex; - - /* The error value. */ - result = ETIMEDOUT; - break; - } - } - - /* Another thread woken up. */ - ++cond->__data.__woken_seq; - - bc_out: - - cond->__data.__nwaiters -= 1 << COND_NWAITERS_SHIFT; - - /* If pthread_cond_destroy was called on this variable already, - notify the pthread_cond_destroy caller all waiters have left - and it can be successfully destroyed. */ - if (cond->__data.__total_seq == -1ULL - && cond->__data.__nwaiters < (1 << COND_NWAITERS_SHIFT)) - lll_futex_wake (&cond->__data.__nwaiters, 1, pshared); - - /* We are done with the condvar. */ - lll_unlock (cond->__data.__lock, pshared); - - /* The cancellation handling is back to normal, remove the handler. */ - __pthread_cleanup_pop (&buffer, 0); - - /* Get the mutex before returning. */ -#if (defined lll_futex_timed_wait_requeue_pi \ - && defined __ASSUME_REQUEUE_PI) - if (pi_flag) - { - __pthread_mutex_cond_lock_adjust (mutex); - err = 0; - } - else -#endif - err = __pthread_mutex_cond_lock (mutex); - - return err ?: result; -} - -versioned_symbol (libpthread, __pthread_cond_timedwait, pthread_cond_timedwait, - GLIBC_2_3_2); |