aio_suspend - wait for asynchronous I/O operation or timeout
int aio_suspend(const struct aiocb * const aiocb_list, int nitems, const struct timespec *timeout);
Link with -lrt.
The aio_suspend() function suspends the calling thread until one of the following occurs:
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.)
|*||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).)|
If CLOCK_MONOTONIC is supported, this clock is used to measure the timeout interval (see clock_gettime(3)).
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.
|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.|
The aio_suspend() function is available since glibc 2.1.
For an explanation of the terms used in this section, see attributes(7).
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.
The glibc implementation of aio_suspend() is not async-signal-safe, in violation of the requirements of POSIX.1.
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