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Loop

Event loop interface. More...

Files

file  spa/include/spa/support/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...
 

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 More...
 
#define spa_loop_update_source(l, ...)   spa_loop_method(l,update_source,0,##__VA_ARGS__)
 update the source io mask More...
 
#define spa_loop_remove_source(l, ...)   spa_loop_method(l,remove_source,0,##__VA_ARGS__)
 remove a source from the loop More...
 
#define spa_loop_invoke(l, ...)   spa_loop_method(l,invoke,0,##__VA_ARGS__)
 invoke a function in the context of this loop More...
 
#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. More...
 
#define spa_loop_control_enter(l)   spa_loop_control_method_v(l,enter,0)
 Enter a loop. More...
 
#define spa_loop_control_leave(l)   spa_loop_control_method_v(l,leave,0)
 Leave a loop. More...
 
#define spa_loop_control_iterate(l, ...)   spa_loop_control_method_r(l,iterate,0,__VA_ARGS__)
 Perform one iteration of the loop. More...
 
#define spa_loop_control_check(l)   spa_loop_control_method_r(l,check,1)
 Check context of the loop. More...
 
#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. 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)
 

Detailed Description

Event loop interface.

Macro Definition Documentation

◆ SPA_TYPE_INTERFACE_Loop

◆ SPA_TYPE_INTERFACE_DataLoop

◆ SPA_VERSION_LOOP

#define SPA_VERSION_LOOP   0

◆ SPA_TYPE_INTERFACE_LoopControl

◆ 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)

◆ 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
ctrlthe control to change
hooksthe 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
ctrlthe 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
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
ctrlthe control

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

See also
spa_loop_control_methods.leave
Examples
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
ctrlthe control
timeoutan 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
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
ctrlthe 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__)

◆ spa_loop_utils_update_io

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

◆ spa_loop_utils_add_idle

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

◆ spa_loop_utils_enable_idle

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

◆ spa_loop_utils_add_event

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

◆ spa_loop_utils_signal_event

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

◆ spa_loop_utils_add_timer

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

◆ spa_loop_utils_update_timer

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

◆ spa_loop_utils_add_signal

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

◆ 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

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)