Pipe

Pipe provides an approach to send a data set from C layer to script layer.

Functions

In C

int mln_lang_ctx_pipe_send(mln_lang_ctx_t *ctx, char *fmt, ...);

This function will send a data set given by ... to a specified script task by ctx.

fmt is used for the interpretation of variable parameters, fmt supports three characters:

• i integer, which should be an mln_s64_t type integer
• r real number, which should be of type double
• s string, which should correspond to the mln_string_t pointer parameter

Return value:

• 0 on success
• -1 fails

In Melang

Pipe(op);

This function is used to subscribe, unsubscribe and receive data from C layer.

op has three values:

• subscribe starts to accept data set.
• unsubscribe stop to accept data set.
• recv receive data set.

Return value:

• nil - not subscribed if call this function with op recv.
• [] - no data received.
• An array with each element in it is also an array.

Example

In C

mln_lang_ctx_pipe_send(ctx, "ir", 1, 3.14);

In Melang

sys = Import('sys');
Pipe('subscribe');
sys.print(Pipe('recv'));
Pipe('unsubscribe');

The output is:

[[1, 3.14], ]