e5106342c6
_foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by John Birrell.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/uio.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
#pragma weak readv=_readv
|
|
|
|
ssize_t
|
|
_readv(int fd, const struct iovec * iov, int iovcnt)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
int ret;
|
|
int type;
|
|
|
|
/* Lock the file descriptor for read: */
|
|
if ((ret = _FD_LOCK(fd, FD_READ, NULL)) == 0) {
|
|
/* Get the read/write mode type: */
|
|
type = _thread_fd_table[fd]->flags & O_ACCMODE;
|
|
|
|
/* Check if the file is not open for read: */
|
|
if (type != O_RDONLY && type != O_RDWR) {
|
|
/* File is not open for read: */
|
|
errno = EBADF;
|
|
_FD_UNLOCK(fd, FD_READ);
|
|
return (-1);
|
|
}
|
|
|
|
/* Perform a non-blocking readv syscall: */
|
|
while ((ret = __sys_readv(fd, iov, iovcnt)) < 0) {
|
|
if ((_thread_fd_table[fd]->flags & O_NONBLOCK) == 0 &&
|
|
(errno == EWOULDBLOCK || errno == EAGAIN)) {
|
|
curthread->data.fd.fd = fd;
|
|
_thread_kern_set_timeout(NULL);
|
|
|
|
/* Reset the interrupted operation flag: */
|
|
curthread->interrupted = 0;
|
|
|
|
_thread_kern_sched_state(PS_FDR_WAIT,
|
|
__FILE__, __LINE__);
|
|
|
|
/*
|
|
* Check if the operation was
|
|
* interrupted by a signal
|
|
*/
|
|
if (curthread->interrupted) {
|
|
errno = EINTR;
|
|
ret = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
_FD_UNLOCK(fd, FD_READ);
|
|
}
|
|
return (ret);
|
|
}
|