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glibc/sysdeps/nptl/aio_misc.h
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/* Copyright (C) 2006-2014 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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/>. */ | |
/* We define a special synchronization primitive for AIO. POSIX | |
conditional variables would be ideal but the pthread_cond_*wait | |
operations do not return on EINTR. This is a requirement for | |
correct aio_suspend and lio_listio implementations. */ | |
#include <assert.h> | |
#include <pthreadP.h> | |
#include <lowlevellock.h> | |
#define DONT_NEED_AIO_MISC_COND 1 | |
#define AIO_MISC_NOTIFY(waitlist) \ | |
do { \ | |
if (*waitlist->counterp > 0 && --*waitlist->counterp == 0) \ | |
lll_futex_wake (waitlist->counterp, 1, LLL_PRIVATE); \ | |
} while (0) | |
#define AIO_MISC_WAIT(result, futex, timeout, cancel) \ | |
do { \ | |
volatile int *futexaddr = &futex; \ | |
int oldval = futex; \ | |
\ | |
if (oldval != 0) \ | |
{ \ | |
pthread_mutex_unlock (&__aio_requests_mutex); \ | |
\ | |
int oldtype; \ | |
if (cancel) \ | |
oldtype = LIBC_CANCEL_ASYNC (); \ | |
\ | |
int status; \ | |
do \ | |
{ \ | |
status = lll_futex_timed_wait (futexaddr, oldval, timeout, \ | |
LLL_PRIVATE); \ | |
if (status != -EWOULDBLOCK) \ | |
break; \ | |
\ | |
oldval = *futexaddr; \ | |
} \ | |
while (oldval != 0); \ | |
\ | |
if (cancel) \ | |
LIBC_CANCEL_RESET (oldtype); \ | |
\ | |
if (status == -EINTR) \ | |
result = EINTR; \ | |
else if (status == -ETIMEDOUT) \ | |
result = EAGAIN; \ | |
else \ | |
assert (status == 0 || status == -EWOULDBLOCK); \ | |
\ | |
pthread_mutex_lock (&__aio_requests_mutex); \ | |
} \ | |
} while (0) | |
#include_next <aio_misc.h> |