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Loop
SPA » Support

Event loop interface More...

## Files
file | loop.h
| `spa/support/loop.h`

## Data Structures
struct | spa_loop
struct | spa_loop_control
struct | spa_loop_utils
struct | spa_source
struct | spa_loop_methods
| Register sources and work items to an event loop. More...
struct | spa_loop_control_hooks
| Control hooks. More...
struct | spa_loop_control_methods
| Control an event loop. More...
struct | spa_loop_utils_methods
| Create sources for an event loop. More...

## Typedefs
typedef void(* | spa_source_func_t) (struct spa_source *source)
typedef int(* | spa_invoke_func_t) (struct spa_loop *loop, bool async, uint32_t seq, const void *data, size_t size, void *user_data)
typedef void(* | spa_source_io_func_t) (void *data, int fd, uint32_t mask)
typedef void(* | spa_source_idle_func_t) (void *data)
typedef void(* | spa_source_event_func_t) (void *data, uint64_t count)
typedef void(* | spa_source_timer_func_t) (void *data, uint64_t expirations)
typedef void(* | spa_source_signal_func_t) (void *data, int signal_number)

## Macros
#define | SPA_TYPE_INTERFACE_Loop SPA_TYPE_INFO_INTERFACE_BASE "Loop"
#define | SPA_TYPE_INTERFACE_DataLoop SPA_TYPE_INFO_INTERFACE_BASE "DataLoop"
#define | SPA_VERSION_LOOP 0
#define | SPA_TYPE_INTERFACE_LoopControl SPA_TYPE_INFO_INTERFACE_BASE "LoopControl"
#define | SPA_VERSION_LOOP_CONTROL 1
#define | SPA_TYPE_INTERFACE_LoopUtils SPA_TYPE_INFO_INTERFACE_BASE "LoopUtils"
#define | SPA_VERSION_LOOP_UTILS 0
#define | SPA_VERSION_LOOP_METHODS 0
#define | spa_loop_method(o, method, version, ...)
#define | spa_loop_add_source(l, ...) spa_loop_method(l,add_source,0,##__VA_ARGS__)
| add a source to the loop
#define | spa_loop_update_source(l, ...) spa_loop_method(l,update_source,0,##__VA_ARGS__)
| update the source io mask
#define | spa_loop_remove_source(l, ...) spa_loop_method(l,remove_source,0,##__VA_ARGS__)
| remove a source from the loop
#define | spa_loop_invoke(l, ...) spa_loop_method(l,invoke,0,##__VA_ARGS__)
| invoke a function in the context of this loop
#define | SPA_VERSION_LOOP_CONTROL_HOOKS 0
#define | spa_loop_control_hook_before(l)
#define | spa_loop_control_hook_after(l)
#define | SPA_VERSION_LOOP_CONTROL_METHODS 1
#define | spa_loop_control_method_v(o, method, version, ...)
#define | spa_loop_control_method_r(o, method, version, ...)
#define | spa_loop_control_method_fast_r(o, method, version, ...)
#define | spa_loop_control_get_fd(l) spa_loop_control_method_r(l,get_fd,0)
#define | spa_loop_control_add_hook(l, ...) spa_loop_control_method_v(l,add_hook,0,__VA_ARGS__)
| Add a hook.
#define | spa_loop_control_enter(l) spa_loop_control_method_v(l,enter,0)
| Enter a loop.
#define | spa_loop_control_leave(l) spa_loop_control_method_v(l,leave,0)
| Leave a loop.
#define | spa_loop_control_iterate(l, ...) spa_loop_control_method_r(l,iterate,0,__VA_ARGS__)
| Perform one iteration of the loop.
#define | spa_loop_control_check(l) spa_loop_control_method_r(l,check,1)
| Check context of the loop.
#define | spa_loop_control_iterate_fast(l, ...) spa_loop_control_method_fast_r(l,iterate,0,__VA_ARGS__)
#define | SPA_VERSION_LOOP_UTILS_METHODS 0
#define | spa_loop_utils_method_v(o, method, version, ...)
#define | spa_loop_utils_method_r(o, method, version, ...)
#define | spa_loop_utils_method_s(o, method, version, ...)
#define | spa_loop_utils_add_io(l, ...) spa_loop_utils_method_s(l,add_io,0,__VA_ARGS__)
#define | spa_loop_utils_update_io(l, ...) spa_loop_utils_method_r(l,update_io,0,__VA_ARGS__)
#define | spa_loop_utils_add_idle(l, ...) spa_loop_utils_method_s(l,add_idle,0,__VA_ARGS__)
#define | spa_loop_utils_enable_idle(l, ...) spa_loop_utils_method_r(l,enable_idle,0,__VA_ARGS__)
#define | spa_loop_utils_add_event(l, ...) spa_loop_utils_method_s(l,add_event,0,__VA_ARGS__)
#define | spa_loop_utils_signal_event(l, ...) spa_loop_utils_method_r(l,signal_event,0,__VA_ARGS__)
#define | spa_loop_utils_add_timer(l, ...) spa_loop_utils_method_s(l,add_timer,0,__VA_ARGS__)
#define | spa_loop_utils_update_timer(l, ...) spa_loop_utils_method_r(l,update_timer,0,__VA_ARGS__)
#define | spa_loop_utils_add_signal(l, ...) spa_loop_utils_method_s(l,add_signal,0,__VA_ARGS__)
#define | spa_loop_utils_destroy_source(l, ...) spa_loop_utils_method_v(l,destroy_source,0,__VA_ARGS__)
| destroy a source allocated with this interface.

## Detailed Description

Event loop interface

## Typedef Documentation

## ◆ spa_source_func_t

typedef void(* spa_source_func_t) (struct spa_source *source)

## ◆ spa_invoke_func_t

typedef int(* spa_invoke_func_t) (struct spa_loop *loop, bool async, uint32_t seq, const void *data, size_t size, void *user_data)

## ◆ spa_source_io_func_t

typedef void(* spa_source_io_func_t) (void *data, int fd, uint32_t mask)

## ◆ spa_source_idle_func_t

typedef void(* spa_source_idle_func_t) (void *data)

## ◆ spa_source_event_func_t

typedef void(* spa_source_event_func_t) (void *data, uint64_t count)

## ◆ spa_source_timer_func_t

typedef void(* spa_source_timer_func_t) (void *data, uint64_t expirations)

## ◆ spa_source_signal_func_t

typedef void(* spa_source_signal_func_t) (void *data, int signal_number)

## Macro Definition Documentation

## ◆ SPA_TYPE_INTERFACE_Loop

#define SPA_TYPE_INTERFACE_Loop SPA_TYPE_INFO_INTERFACE_BASE "Loop"

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ SPA_TYPE_INTERFACE_DataLoop

#define SPA_TYPE_INTERFACE_DataLoop SPA_TYPE_INFO_INTERFACE_BASE "DataLoop"

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ SPA_VERSION_LOOP

#define SPA_VERSION_LOOP 0

## ◆ SPA_TYPE_INTERFACE_LoopControl

#define SPA_TYPE_INTERFACE_LoopControl SPA_TYPE_INFO_INTERFACE_BASE "LoopControl"

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ SPA_VERSION_LOOP_CONTROL

#define SPA_VERSION_LOOP_CONTROL 1

## ◆ SPA_TYPE_INTERFACE_LoopUtils

#define SPA_TYPE_INTERFACE_LoopUtils SPA_TYPE_INFO_INTERFACE_BASE "LoopUtils"

## ◆ SPA_VERSION_LOOP_UTILS

#define SPA_VERSION_LOOP_UTILS 0

## ◆ SPA_VERSION_LOOP_METHODS

#define SPA_VERSION_LOOP_METHODS 0

## ◆ spa_loop_method

#define spa_loop_method | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_add_source

#define spa_loop_add_source | ( |  | l,
|  |  | ... ) spa_loop_method(l,add_source,0,##__VA_ARGS__)

add a source to the loop

See also
  spa_loop_methods.add_source

## ◆ spa_loop_update_source

#define spa_loop_update_source | ( |  | l,
|  |  | ... ) spa_loop_method(l,update_source,0,##__VA_ARGS__)

update the source io mask

See also
  spa_loop_methods.update_source

## ◆ spa_loop_remove_source

#define spa_loop_remove_source | ( |  | l,
|  |  | ... ) spa_loop_method(l,remove_source,0,##__VA_ARGS__)

remove a source from the loop

See also
  spa_loop_methods.remove_source

## ◆ spa_loop_invoke

#define spa_loop_invoke | ( |  | l,
|  |  | ... ) spa_loop_method(l,invoke,0,##__VA_ARGS__)

invoke a function in the context of this loop

See also
  spa_loop_methods.invoke

## ◆ SPA_VERSION_LOOP_CONTROL_HOOKS

#define SPA_VERSION_LOOP_CONTROL_HOOKS 0

## ◆ spa_loop_control_hook_before

#define spa_loop_control_hook_before | ( |  | l | ) |

## ◆ spa_loop_control_hook_after

#define spa_loop_control_hook_after | ( |  | l | ) |

## ◆ SPA_VERSION_LOOP_CONTROL_METHODS

#define SPA_VERSION_LOOP_CONTROL_METHODS 1

## ◆ spa_loop_control_method_v

#define spa_loop_control_method_v | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_control_method_r

#define spa_loop_control_method_r | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_control_method_fast_r

#define spa_loop_control_method_fast_r | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_control_get_fd

#define spa_loop_control_get_fd | ( |  | l | ) | spa_loop_control_method_r(l,get_fd,0)

See also
  spa_loop_control_methods.get_fd

## ◆ spa_loop_control_add_hook

#define spa_loop_control_add_hook | ( |  | l,
|  |  | ... ) spa_loop_control_method_v(l,add_hook,0,__VA_ARGS__)

Add a hook.

Parameters

  ctrl | the control to change
  hooks | the hooks to add

Adds hooks to the loop controlled by ctrl.

See also
  spa_loop_control_methods.add_hook

## ◆ spa_loop_control_enter

#define spa_loop_control_enter | ( |  | l | ) | spa_loop_control_method_v(l,enter,0)

Enter a loop.

Parameters

  ctrl | the control

Start an iteration of the loop. This function should be called before calling iterate and is typically used to capture the thread that this loop will run in.

See also
  spa_loop_control_methods.enter

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ spa_loop_control_leave

#define spa_loop_control_leave | ( |  | l | ) | spa_loop_control_method_v(l,leave,0)

Leave a loop.

Parameters

  ctrl | the control

Ends the iteration of a loop. This should be called after calling iterate.

See also
  spa_loop_control_methods.leave

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ spa_loop_control_iterate

#define spa_loop_control_iterate | ( |  | l,
|  |  | ... ) spa_loop_control_method_r(l,iterate,0,__VA_ARGS__)

Perform one iteration of the loop.

Parameters

  ctrl | the control
  timeout | an optional timeout in milliseconds. 0 for no timeout, -1 for infinite timeout.

This function will block up to timeout milliseconds and then dispatch the fds with activity. The number of dispatched fds is returned.

See also
  spa_loop_control_methods.iterate

Examples
  local-v4l2.c, spa/examples/adapter-control.c, spa/examples/example-control.c, spa/examples/local-libcamera.c, and spa/examples/local-v4l2.c.

## ◆ spa_loop_control_check

#define spa_loop_control_check | ( |  | l | ) | spa_loop_control_method_r(l,check,1)

Check context of the loop.

Parameters

  ctrl | the control

This function will check if the current thread is currently the one that did the enter call. Since version 1:1.

returns 1 on success, 0 or negative errno value on error.

See also
  spa_loop_control_methods.check

## ◆ spa_loop_control_iterate_fast

#define spa_loop_control_iterate_fast | ( |  | l,
|  |  | ... ) spa_loop_control_method_fast_r(l,iterate,0,__VA_ARGS__)

## ◆ SPA_VERSION_LOOP_UTILS_METHODS

#define SPA_VERSION_LOOP_UTILS_METHODS 0

## ◆ spa_loop_utils_method_v

#define spa_loop_utils_method_v | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_utils_method_r

#define spa_loop_utils_method_r | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_utils_method_s

#define spa_loop_utils_method_s | ( |  | o,
|  |  | method,
|  |  | version,
|  |  | ... )

## ◆ spa_loop_utils_add_io

#define spa_loop_utils_add_io | ( |  | l,
|  |  | ... ) spa_loop_utils_method_s(l,add_io,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.add_io

## ◆ spa_loop_utils_update_io

#define spa_loop_utils_update_io | ( |  | l,
|  |  | ... ) spa_loop_utils_method_r(l,update_io,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.update_io

## ◆ spa_loop_utils_add_idle

#define spa_loop_utils_add_idle | ( |  | l,
|  |  | ... ) spa_loop_utils_method_s(l,add_idle,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.add_idle

## ◆ spa_loop_utils_enable_idle

#define spa_loop_utils_enable_idle | ( |  | l,
|  |  | ... ) spa_loop_utils_method_r(l,enable_idle,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.enable_idle

## ◆ spa_loop_utils_add_event

#define spa_loop_utils_add_event | ( |  | l,
|  |  | ... ) spa_loop_utils_method_s(l,add_event,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.add_event

## ◆ spa_loop_utils_signal_event

#define spa_loop_utils_signal_event | ( |  | l,
|  |  | ... ) spa_loop_utils_method_r(l,signal_event,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.signal_event

## ◆ spa_loop_utils_add_timer

#define spa_loop_utils_add_timer | ( |  | l,
|  |  | ... ) spa_loop_utils_method_s(l,add_timer,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.add_timer

## ◆ spa_loop_utils_update_timer

#define spa_loop_utils_update_timer | ( |  | l,
|  |  | ... ) spa_loop_utils_method_r(l,update_timer,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.update_timer

## ◆ spa_loop_utils_add_signal

#define spa_loop_utils_add_signal | ( |  | l,
|  |  | ... ) spa_loop_utils_method_s(l,add_signal,0,__VA_ARGS__)

See also
  spa_loop_utils_methods.add_signal

## ◆ spa_loop_utils_destroy_source

#define spa_loop_utils_destroy_source | ( |  | l,
|  |  | ... ) spa_loop_utils_method_v(l,destroy_source,0,__VA_ARGS__)

destroy a source allocated with this interface.

This function should only be called when the loop is not running or from the context of the running loop

See also
  spa_loop_utils_methods.destroy_source