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aio_suspend(2) [freebsd man page]

AIO_SUSPEND(2)						      BSD System Calls Manual						    AIO_SUSPEND(2)

NAME
aio_suspend -- suspend until asynchronous I/O operations or timeout complete (REALTIME) LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <aio.h> int aio_suspend(const struct aiocb *const iocbs[], int niocb, const struct timespec *timeout); DESCRIPTION
The aio_suspend() system call suspends the calling process until at least one of the specified asynchronous I/O requests have completed, a signal is delivered, or the timeout has passed. The iocbs argument is an array of niocb pointers to asynchronous I/O requests. Array members containing null pointers will be silently ignored. If timeout is not a null pointer, it specifies a maximum interval to suspend. If timeout is a null pointer, the suspend blocks indefinitely. To effect a poll, the timeout should point to a zero-value timespec structure. RETURN VALUES
If one or more of the specified asynchronous I/O requests have completed, aio_suspend() returns 0. Otherwise it returns -1 and sets errno to indicate the error, as enumerated below. ERRORS
The aio_suspend() system call will fail if: [EAGAIN] the timeout expired before any I/O requests completed. [EINVAL] The iocbs argument contains more than AIO_LISTIO_MAX asynchronous I/O requests, or at least one of the requests is not valid. [EINTR] the suspend was interrupted by a signal. SEE ALSO
aio_cancel(2), aio_error(2), aio_return(2), aio_waitcomplete(2), aio_write(2), aio(4) STANDARDS
The aio_suspend() system call is expected to conform to the IEEE Std 1003.1 (``POSIX.1'') standard. HISTORY
The aio_suspend() system call first appeared in FreeBSD 3.0. AUTHORS
This manual page was written by Wes Peters <wes@softweyr.com>. BSD
June 2, 1999 BSD

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AIO_SUSPEND(3)						     Linux Programmer's Manual						    AIO_SUSPEND(3)

NAME
aio_suspend - wait for asynchronous I/O operation or timeout SYNOPSIS
#include <aio.h> int aio_suspend(const struct aiocb * const aiocb_list[], int nitems, const struct timespec *timeout); Link with -lrt. DESCRIPTION
The aio_suspend() function suspends the calling thread until one of the following occurs: * One or more of the asynchronous I/O requests in the list aiocb_list has completed. * A signal is delivered. * timeout is not NULL and the specified time interval has passed. (For details of the timespec structure, see nanosleep(2).) The nitems argument specifies the number of items in aiocb_list. Each item in the list pointed to by aiocb_list must be either NULL (and then is ignored), or a pointer to a control block on which I/O was initiated using aio_read(3), aio_write(3), or lio_listio(3). (See aio(7) for a description of the aiocb structure.) If CLOCK_MONOTONIC is supported, this clock is used to measure the timeout interval (see clock_gettime(3)). RETURN VALUE
If this function returns after completion of one of the I/O requests specified in aiocb_list, 0 is returned. Otherwise, -1 is returned, and errno is set to indicate the error. ERRORS
EAGAIN The call timed out before any of the indicated operations had completed. EINTR The call was ended by signal (possibly the completion signal of one of the operations we were waiting for); see signal(7). ENOSYS aio_suspend() is not implemented. VERSIONS
The aio_suspend() function is available since glibc 2.1. CONFORMING TO
POSIX.1-2001, POSIX.1-2008. NOTES
One can achieve polling by using a non-NULL timeout that specifies a zero time interval. If one or more of the asynchronous I/O operations specified in aiocb_list has already completed at the time of the call to aio_suspend(), then the call returns immediately. To determine which I/O operations have completed after a successful return from aio_suspend(), use aio_error(3) to scan the list of aiocb structures pointed to by aiocb_list. SEE ALSO
aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_write(3), lio_listio(3), aio(7), time(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2012-05-08 AIO_SUSPEND(3)
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