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Man Pages
XS_SETCTXOPT(3) Crossroads I/O Manual XS_SETCTXOPT(3)

xs_setctxopt - set Crossroads context options

int xs_setctxopt (void *context, int option_name, const void *option_value, size_t option_len);

The xs_setctxopt() function shall set the option specified by the option_name argument to the value pointed to by the option_value argument, for the Crossroads context pointed to by the context argument. The option_len argument is the size of the option value in bytes.


Caution

Context options take effect only if set with xs_setctxopt() prior to creating the first socket in a given context with xs_socket().

The following options can be set with the xs_setctxopt() function:

The XS_MAX_SOCKETS option shall set the maximum nuber of sockets that can be simultaneously active in the given context.
Option value type int
Option value unit sockets
Default value 512

The XS_IO_THREADS option shall set the size of the thread pool created by the given context to handle I/O operations. The minimum value for this option is 1.
Option value type int
Option value unit threads
Default value 1

The xs_setctxopt() function shall return zero if successful. Otherwise it shall return -1 and set errno to one of the values defined below.

EINVAL
The requested option option_name is unknown, or the requested option_len or option_value is invalid.

EFAULT

The provided context was invalid.

Setting the number of I/O threads for a context to four..

void *context = xs_init ();
int io_threads = 4;
rc = xs_setctxopt (context, XS_IO_THREADS, &io_threads, sizeof (io_threads));
assert (rc == 0);
/* The above call MUST be called before any socket is created in context */
void *socket = xs_socket (context, XS_PUB);

xs_init(3) xs(7)

The Crossroads documentation was written by Martin Sustrik <sustrik@250bpm.com[1]> and Martin Lucina <martin@lucina.net[2]>.

1.
sustrik@250bpm.com
mailto:sustrik@250bpm.com
2.
martin@lucina.net
mailto:martin@lucina.net
04/08/2022 Crossroads I/O 1.2.0

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