194 lines
4.4 KiB
ReStructuredText
194 lines
4.4 KiB
ReStructuredText
Threading
|
|
=========
|
|
|
|
Libobs provides a number of helper functions/types specifically for
|
|
threading. The threading header will additionally provide access to
|
|
pthread functions even on windows.
|
|
|
|
.. code:: cpp
|
|
|
|
#include <util/threading.h>
|
|
|
|
|
|
Threading Types
|
|
---------------
|
|
|
|
.. type:: os_event_t
|
|
.. type:: os_sem_t
|
|
|
|
|
|
General Thread Functions
|
|
------------------------
|
|
|
|
.. function:: void os_set_thread_name(const char *name)
|
|
|
|
Sets the name of the current thread.
|
|
|
|
----------------------
|
|
|
|
|
|
Event Functions
|
|
---------------
|
|
|
|
.. function:: int os_event_init(os_event_t **event, enum os_event_type type)
|
|
|
|
Creates an event object.
|
|
|
|
:param event: Pointer that receives a pointer to a new event object
|
|
:param type: Can be one of the following values:
|
|
|
|
- OS_EVENT_TYPE_AUTO - Automatically resets when
|
|
signaled
|
|
- OS_EVENT_TYPE_MANUAL - Stays signaled until the
|
|
:c:func:`os_event_reset()` function is called
|
|
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
----------------------
|
|
|
|
.. function:: void os_event_destroy(os_event_t *event)
|
|
|
|
Destroys an event.
|
|
|
|
:param event: An event object
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_event_wait(os_event_t *event)
|
|
|
|
Waits for an event to signal.
|
|
|
|
:param event: An event object
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_event_timedwait(os_event_t *event, unsigned long milliseconds)
|
|
|
|
Waits a specific duration for an event to signal.
|
|
|
|
:param event: An event object
|
|
:param milliseconds: Milliseconds to wait
|
|
:return: Can be one of the following values:
|
|
|
|
- 0 - successful
|
|
- ETIMEDOUT - Timed out
|
|
- EINVAL - An unexpected error occurred
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_event_try(os_event_t *event)
|
|
|
|
Checks for a signaled state without waiting.
|
|
|
|
:param event: An event object
|
|
:return: Can be one of the following values:
|
|
|
|
- 0 - successful
|
|
- EAGAIN - The event is not signaled
|
|
- EINVAL - An unexpected error occurred
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_event_signal(os_event_t *event)
|
|
|
|
Signals the event.
|
|
|
|
:param event: An event object
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
----------------------
|
|
|
|
.. function:: void os_event_reset(os_event_t *event)
|
|
|
|
Resets the signaled state of the event.
|
|
|
|
:param event: An event object
|
|
|
|
----------------------
|
|
|
|
|
|
Semaphore Functions
|
|
-------------------
|
|
|
|
.. function:: int os_sem_init(os_sem_t **sem, int value)
|
|
|
|
Creates a semaphore object.
|
|
|
|
:param sem: Pointer that receives a pointer to the semaphore object
|
|
:param value: Initial value of the semaphore
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
----------------------
|
|
|
|
.. function:: void os_sem_destroy(os_sem_t *sem)
|
|
|
|
Destroys a semaphore object.
|
|
|
|
:param sem: Semaphore object
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_sem_post(os_sem_t *sem)
|
|
|
|
Increments the semaphore.
|
|
|
|
:param sem: Semaphore object
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
----------------------
|
|
|
|
.. function:: int os_sem_wait(os_sem_t *sem)
|
|
|
|
Decrements the semaphore or waits until the semaphore has been
|
|
incremented.
|
|
|
|
:param sem: Semaphore object
|
|
:return: 0 if successful, negative otherwise
|
|
|
|
---------------------
|
|
|
|
|
|
Atomic Inline Functions
|
|
-----------------------
|
|
|
|
.. function:: long os_atomic_inc_long(volatile long *val)
|
|
|
|
Increments a long variable atomically.
|
|
|
|
---------------------
|
|
|
|
.. function:: long os_atomic_dec_long(volatile long *val)
|
|
|
|
Decrements a long variable atomically.
|
|
|
|
---------------------
|
|
|
|
.. function:: long os_atomic_set_long(volatile long *ptr, long val)
|
|
|
|
Sets the value of a long variable atomically.
|
|
|
|
---------------------
|
|
|
|
.. function:: long os_atomic_load_long(const volatile long *ptr)
|
|
|
|
Gets the value of a long variable atomically.
|
|
|
|
---------------------
|
|
|
|
.. function:: bool os_atomic_compare_swap_long(volatile long *val, long old_val, long new_val)
|
|
|
|
Swaps the value of a long variable atomically if its value matches.
|
|
|
|
---------------------
|
|
|
|
.. function:: bool os_atomic_set_bool(volatile bool *ptr, bool val)
|
|
|
|
Sets the value of a boolean variable atomically.
|
|
|
|
---------------------
|
|
|
|
.. function:: bool os_atomic_load_bool(const volatile bool *ptr)
|
|
|
|
Gets the value of a boolean variable atomically.
|