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# libtuberia
libtuberia: a library to implement a pipeline
A pipeline would be:
*[Source] -> [queue_1] -> [Stage_1] -> [Queue_2] -> [Stage_2] -> [...] -> [Sink]*
Each source, stage, and sink runs in a thread, reads from its imput queue and
write to the output queue
You can ommit the source and sink, and inject or retrive elements from the
pipeline
## Building, Compiling, Installing
If you don't have a ./configure file, run:
- `autoreconf -fi`
When you have the ./configure file, run:
- `./configure`
- `make`
- `make install`
You can see some configuration options with:
- `./configure --help`
## Using this library
Include tuberia.h, and link libtuberia.a and pthread: `-ltuberia -lpthread`
You can also use: `pkg-config --cflags --libs --static tuberia`
## Quick Guide
See the files `example/simple.c` and `example/decode_resize_encode.c`
(function `do_tuberia()` in particular)
Create a source with `tube_source_alloc()`.
If you set fetch to something, there will be a thread running fetch to inject
elements into the pipeline.
If you set fetch to NULL, you have to inject the elements with `tube_inject()`.
Create as many stages as you need with `tube_stage_alloc()`, and append them
to the source with `tube_stage_append()`.
Build the pipeline with `tube_alloc()`. If you set sink to something,
there will be a thread running sink to get the elements from the pipeline.
If you set sink to NULL, you have to retrieve the elements with
`tube_retrieve()`.
The `tube_alloc()` function copies the source and all the appended stages,
so you can free the source and stages with `tube_source_and_stages_free()`.
Or, you can reutilize the same `tube_source` to build more pipelines.
Start the pipeline with `tube_start()`.
Free the pipeline with `tube_free()`.
### Quick example
See `examples/simple.c`
Compile with: `gcc -o simple simple.c -ltuberia -lpthread`
Or with: ``gcc -o simple simple.c `pkg-config --cflags --libs --static tuberia```
```C
#include <stdio.h>
#include <stdlib.h>
#include <tuberia.h>
void *stage_one(void *element, void *opaque)
{
int *i = element;
*i += 5;
return i;
}
void *stage_two(void *element, void *opaque)
{
int *i = element;
*i *= 10;
return i;
}
void sink(void *element, void *opaque)
{
int *i = element;
printf("sink: %d\n", *i);
free(i);
}
int main(void)
{
tube *ctx;
tube_source *source;
int *element, n;
source = tube_source_alloc(2, NULL, NULL, free);
tube_stage_append(source, tube_stage_alloc(2, stage_one, NULL, free));
tube_stage_append(source, tube_stage_alloc(2, stage_two, NULL, free));
ctx = tube_alloc(source, sink, NULL);
tube_source_and_stages_free(&source);
tube_start(ctx);
while (scanf("%d", &n) == 1) {
element = malloc(sizeof(*element));
*element = n;
tube_inject(ctx, 1000, element);
}
tube_free(&ctx);
return 0;
}
```
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