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Lock
Eina » Tools

This group provides thread locking and synchronization capabilities. More...

## Macros
#define | EINA_MAIN_LOOP_CHECK_RETURN_VAL(val) do {} while(0)
| Definition for the macro that doesn't do anything unless `EINA_HAVE_DEBUG_THREADS` is defined.
#define | EINA_MAIN_LOOP_CHECK_RETURN do {} while(0)
| Definition for the macro that doesn't do anything unless `EINA_HAVE_DEBUG_THREADS` is defined.

## Typedefs
typedef void(* | Eina_TLS_Delete_Cb) (void *ptr)
| A callback type for deallocation of thread level storage data.
typedef struct _Eina_Barrier | Eina_Barrier
| An opaque type for working with barrier locks.
typedef struct _Eina_Lock | Eina_Lock
| An opaque type for working with locks.
typedef struct _Eina_Condition | Eina_Condition
| An opaque type that represents a condition variable.
typedef struct _Eina_RWLock | Eina_RWLock
| An opaque type for working with read/write locks.
typedef pthread_key_t | Eina_TLS
| An opaque type for working with thread level storage.
typedef sem_t | Eina_Semaphore
| An opaque type for working with semaphores.
typedef Eina_Lock | Eina_Spinlock
| An opaque type for working with spinlocks.

## Enumerations
enum | Eina_Lock_Result { EINA_LOCK_FAIL = EINA_FALSE , EINA_LOCK_SUCCEED = EINA_TRUE , EINA_LOCK_DEADLOCK }
| Return codes for lock operations. More...

## Functions
static Eina_Bool | eina_lock_new (Eina_Lock *mutex)
| Initializes a new Eina_Lock.
static Eina_Bool | eina_lock_recursive_new (Eina_Lock *mutex)
| Initializes a new Eina_Lock that is recursive.
static void | eina_lock_free (Eina_Lock *mutex)
| Deallocates an Eina_Lock.
static Eina_Lock_Result | eina_lock_take (Eina_Lock *mutex)
| Attempts to take a lock.
static Eina_Lock_Result | eina_lock_take_try (Eina_Lock *mutex)
| Attempts to take a lock if possible.
static Eina_Lock_Result | eina_lock_release (Eina_Lock *mutex)
| Releases a lock.
EINA_API void | eina_lock_debug (const Eina_Lock *mutex)
| Prints debug information about a lock.
static Eina_Bool | eina_condition_new (Eina_Condition *cond, Eina_Lock *mutex)
| Initializes a new condition variable.
static void | eina_condition_free (Eina_Condition *cond)
| Deallocates a condition variable.
static Eina_Bool | eina_condition_wait (Eina_Condition *cond)
| Causes a thread to wait until signaled by the condition.
static Eina_Bool | eina_condition_timedwait (Eina_Condition *cond, double t)
| Causes a thread to wait until signaled by the condition or a timeout is reached.
static Eina_Bool | eina_condition_broadcast (Eina_Condition *cond)
| Signals all threads waiting for a condition.
static Eina_Bool | eina_condition_signal (Eina_Condition *cond)
| Signals a thread waiting for a condition.
static Eina_Bool | eina_rwlock_new (Eina_RWLock *mutex)
| Initializes a new Eina_RWLock.
static void | eina_rwlock_free (Eina_RWLock *mutex)
| Deallocates an Eina_RWLock.
static Eina_Lock_Result | eina_rwlock_take_read (Eina_RWLock *mutex)
| Attempts to take a read lock.
static Eina_Lock_Result | eina_rwlock_take_write (Eina_RWLock *mutex)
| Attempts to take a write lock.
static Eina_Lock_Result | eina_rwlock_release (Eina_RWLock *mutex)
| Releases a lock.
static Eina_Bool | eina_tls_new (Eina_TLS *key)
| Initializes a new Eina_TLS, or thread level storage, to store thread specific data.
static Eina_Bool | eina_tls_cb_new (Eina_TLS *key, Eina_TLS_Delete_Cb delete_cb)
| Initializes a new Eina_TLS, or thread level storage, to store thread specific data.
static void | eina_tls_free (Eina_TLS key)
| Frees an allocated Eina_TLS.
static void * | eina_tls_get (Eina_TLS key)
| Gets the value in Eina_TLS for this thread.
static Eina_Bool | eina_tls_set (Eina_TLS key, const void *data)
| Sets the value in Eina_TLS for this thread.
static Eina_Bool | eina_semaphore_new (Eina_Semaphore *sem, int count_init)
| Initializes a new Eina_Semaphore.
static Eina_Bool | eina_semaphore_free (Eina_Semaphore *sem)
| Frees an allocated Eina_Semaphore.
static Eina_Bool | eina_semaphore_lock (Eina_Semaphore *sem)
| Gets a lock on an Eina_Semaphore.
static Eina_Bool | eina_semaphore_release (Eina_Semaphore *sem, int count_release)
| Releases a lock on an Eina_Semaphore.
static Eina_Bool | eina_barrier_new (Eina_Barrier *barrier, int needed)
| Initializes a new Eina_Barrier.
static void | eina_barrier_free (Eina_Barrier *barrier)
| Frees an allocated Eina_Barrier.
static Eina_Bool | eina_barrier_wait (Eina_Barrier *barrier)
| Increments the count of threads that are waiting on `barrier`.
static Eina_Bool | eina_spinlock_new (Eina_Spinlock *spinlock)
| Initializes a new Eina_Spinlock.
static Eina_Lock_Result | eina_spinlock_take (Eina_Spinlock *spinlock)
| Attempts to take a spinlock.
static Eina_Lock_Result | eina_spinlock_take_try (Eina_Spinlock *spinlock)
| Attempts to take a spinlock if possible.
static Eina_Lock_Result | eina_spinlock_release (Eina_Spinlock *spinlock)
| Releases a spinlock.
static void | eina_spinlock_free (Eina_Spinlock *spinlock)
| Deallocates an Eina_Spinlock.

## Variables
EINA_API Eina_Error | EINA_ERROR_NOT_MAIN_LOOP
| A type definition for warning that a function was called from somewhere other than the EFL main loop.

## Detailed Description

This group provides thread locking and synchronization capabilities.

Similar to POSIX threads (pthreads), but it takes care of the platform specific details so you don't have to.

If you know how `pthreads` work, this library will look familiar to you. If you are not familiar with `pthreads`, a good overview is available here

The Eina lock functions are grouped into several categories to handle different thread locking and synchronization methods:

- eina_lock_* - Functions that implement locking.
- eina_condition_* - Functions that implement condition variables.
- eina_rwlock_* - Functions that implement read/write locks.
- eina_tls_* - Functions that implement thread level storage.
- eina_semaphore_* - Functions that implement semaphores.
- eina_barrier_* - Functions that implement barriers.
- eina_spinlock_* - Functions that implement spinlocks if they are available on the platform. If they are not available, these functions degrade to plain locks.

## Macro Definition Documentation

## ◆ EINA_MAIN_LOOP_CHECK_RETURN_VAL

#define EINA_MAIN_LOOP_CHECK_RETURN_VAL | ( |  | val | ) | do {} while(0)

Definition for the macro that doesn't do anything unless `EINA_HAVE_DEBUG_THREADS` is defined.

Parameters

  [in] | val | The value to be returned

## Enumeration Type Documentation

## ◆ Eina_Lock_Result

enum Eina_Lock_Result

Return codes for lock operations.

Enumerator
EINA_LOCK_FAIL | Indicates that the lock operation failed.
EINA_LOCK_SUCCEED | Indicates that the lock operation succeeded.
EINA_LOCK_DEADLOCK | Indicates that the lock is deadlocked.

## Function Documentation

## ◆ eina_lock_new()

static Eina_Bool eina_lock_new | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Initializes a new Eina_Lock.

Parameters

  [in] | mutex | The Eina_Lock structure to be initialized

Returns
  EINA_TRUE on success, EINA_FALSE otherwise

This function initializes an Eina_Lock with appropriate values. These values are platform dependent as is the structure of the Eina_Lock itself.

See also
  eina_lock_free()

## ◆ eina_lock_recursive_new()

static Eina_Bool eina_lock_recursive_new | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Initializes a new Eina_Lock that is recursive.

Parameters

  [in] | mutex | The Eina_Lock structure to be initialized

Returns
  EINA_TRUE on success, EINA_FALSE otherwise

This function initializes an Eina_Lock with appropriate values. These values are platform dependent as is the structure of the Eina_Lock itself.

See also
  eina_lock_new()
  eina_lock_free()

Since
  1.19

## ◆ eina_lock_free()

static void eina_lock_free | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Deallocates an Eina_Lock.

This function deallocates an Eina_Lock allocated by eina_lock_new() and does any platform dependent cleanup that is required.

Parameters

  [in] | mutex | The Eina_Lock structure to be deallocated

See also
  eina_lock_new()

## ◆ eina_lock_take()

static Eina_Lock_Result eina_lock_take | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Attempts to take a lock.

This function attempts to gain a lock on the indicated Eina_Lock. If the underlying Eina_Lock is locked already, this call can be blocked until the lock is released. This is appropriate in many cases, but consider using eina_lock_take_try() if you don't need to block.

Parameters

  [in] | mutex | The Eina_Lock to take

Returns
  Returns EINA_LOCK_SUCCEED on success. If the operation fails because a deadlock condition exists, it returns EINA_LOCK_DEADLOCK. If some other condition causes the take to fail, EINA_LOCK_FAIL is returned.

See also
  eina_lock_take_try()
  eina_lock_release()

## ◆ eina_lock_take_try()

static Eina_Lock_Result eina_lock_take_try | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Attempts to take a lock if possible.

This function attempts to gain a lock on the indicated Eina_Lock. Identical eina_lock_take(), but returns immediately if the lock is already taken.

Parameters

  [in] | mutex | The Eina_Lock to take

Returns
  Returns EINA_LOCK_SUCCEED on success. If the operation fails because a deadlock condition exists, it returns EINA_LOCK_DEADLOCK. If some other condition causes the take to fail, EINA_LOCK_FAIL is returned.

See also
  eina_lock_take()
  eina_lock_release()

## ◆ eina_lock_release()

static Eina_Lock_Result eina_lock_release | ( | Eina_Lock * | mutex | ) |
| inlinestatic

Releases a lock.

This function releases the lock on the indicated Eina_Lock. If successful, and `EINA_HAVE_DEBUG_THREADS` is defined, `mutex` is updated and information about the locking process is removed (e.g. thread number and backtrace for POSIX).

Parameters

  [in] | mutex | The Eina_Lock to release

Returns
  Returns EINA_LOCK_SUCCEED on success, If it fails, EINA_LOCK_FAIL is returned.

See also
  eina_lock_take()
  eina_lock_take_try()

## ◆ eina_lock_debug()

EINA_API void eina_lock_debug | ( | const Eina_Lock * | mutex | ) |

Prints debug information about a lock.

This function prints debug information for `mutex`. The information is platform dependent. On POSIX systems it prints the address of `mutex`, lock state, thread number and a backtrace.

Parameters

  [in] | mutex | The Eina_Lock to print debug info for.

Note
  If `EINA_HAVE_DEBUG_THREADS` is not defined, this function does nothing.

Since
  1.19

## ◆ eina_condition_new()

static Eina_Bool eina_condition_new | ( | Eina_Condition * | cond,
|  | Eina_Lock * | mutex
| ) |  |
| inlinestatic

Initializes a new condition variable.

This function initializes an Eina_Condition structure and associates it with an existing lock.

Parameters

  [in] | cond | The condition variable to create
  [in] | mutex | The Eina_Lock structure that controls access to this condition variable

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

Condition variables are used to coordinate actions between threads. See Condition Variable Overview for an introduction to condition variables and their use.

See also
  eina_condition_free()

## ◆ eina_condition_free()

static void eina_condition_free | ( | Eina_Condition * | cond | ) |
| inlinestatic

Deallocates a condition variable.

This function deallocates a condition variable and does any platform dependent cleanup that is required.

Parameters

  [in] | cond | The condition variable to be deallocated.

See also
  eina_condition_new()

## ◆ eina_condition_wait()

static Eina_Bool eina_condition_wait | ( | Eina_Condition * | cond | ) |
| inlinestatic

Causes a thread to wait until signaled by the condition.

This function makes a thread block until a signal is sent to it via `cond`.

Parameters

  [in] | cond | The Eina_Condition upon which the thread waits.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_condition_timedwait()

## ◆ eina_condition_timedwait()

static Eina_Bool eina_condition_timedwait | ( | Eina_Condition * | cond,
|  | double | t
| ) |  |
| inlinestatic

Causes a thread to wait until signaled by the condition or a timeout is reached.

This function makes a thread block until either a signal is sent to it via `cond` or `t` seconds have passed.

Parameters

  [in] | cond | The Eina_Condition upon which the thread waits.
  [in] | t | The maximum amount of time to wait, in seconds.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise. If the operation timed out, eina error will be set to `ETIMEDOUT`.

See also
  eina_condition_wait()

## ◆ eina_condition_broadcast()

static Eina_Bool eina_condition_broadcast | ( | Eina_Condition * | cond | ) |
| inlinestatic

Signals all threads waiting for a condition.

This function sends a signal to all the threads waiting on the condition `cond`. If you know for sure that there is only one thread waiting, use eina_condition_signal() instead to gain a little optimization.

Parameters

  [in] | cond | The Eina_Condition that signals all its waiting threads.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_condition_signal()

## ◆ eina_condition_signal()

static Eina_Bool eina_condition_signal | ( | Eina_Condition * | cond | ) |
| inlinestatic

Signals a thread waiting for a condition.

This function sends a signal to a thread waiting on the condition `cond`. If you do not know for sure that there is only one thread waiting, use eina_condition_broadcast() instead.

Parameters

  [in] | cond | The Eina_Condition that signals its waiting thread.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

Note
  If there is more than one thread waiting on this condition, one of them is signaled, but which one is undefined.

See also
  eina_condition_broadcast()

## ◆ eina_rwlock_new()

static Eina_Bool eina_rwlock_new | ( | Eina_RWLock * | mutex | ) |
| inlinestatic

Initializes a new Eina_RWLock.

This function initializes an Eina_RWLock with appropriate values. These values are platform dependent as is the structure of the Eina_RWLock itself.

Parameters

  [in] | mutex | The Eina_RWLock to be initialized.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_rwlock_free()

## ◆ eina_rwlock_free()

static void eina_rwlock_free | ( | Eina_RWLock * | mutex | ) |
| inlinestatic

Deallocates an Eina_RWLock.

This function deallocates an Eina_RWLock and does any platform dependent cleanup that is required.

Parameters

  [in] | mutex | The Eina_RWLock structure to be deallocated.

See also
  eina_rwlock_new()

## ◆ eina_rwlock_take_read()

static Eina_Lock_Result eina_rwlock_take_read | ( | Eina_RWLock * | mutex | ) |
| inlinestatic

Attempts to take a read lock.

This function attempts to gain a read lock on the indicated Eina_RWLock. If the Eina_RWLock is write locked, this call can be blocked until the lock is released.

Parameters

  [in] | mutex | The Eina_RWLock to take.

Returns
  Returns EINA_LOCK_SUCCEED on success, EINA_LOCK_FAIL on failure.

Note
  This function never returns EINA_LOCK_DEADLOCK.

See also
  eina_rwlock_release()

## ◆ eina_rwlock_take_write()

static Eina_Lock_Result eina_rwlock_take_write | ( | Eina_RWLock * | mutex | ) |
| inlinestatic

Attempts to take a write lock.

This function attempts to gain a write lock on the indicated Eina_RWLock. If the Eina_RWLock is locked for reading or writing, this call can be blocked until the lock is released.

Parameters

  [in] | mutex | The Eina_RWLock to take.

Returns
  Returns EINA_LOCK_SUCCEED on success, EINA_LOCK_FAIL on failure.

Note
  This function never returns EINA_LOCK_DEADLOCK.

See also
  eina_rwlock_release()

## ◆ eina_rwlock_release()

static Eina_Lock_Result eina_rwlock_release | ( | Eina_RWLock * | mutex | ) |
| inlinestatic

Releases a lock.

This function releases the lock on the indicated Eina_RWLock.

Parameters

  [in] | mutex | The Eina_RWLock to release.

Returns
  Returns EINA_LOCK_SUCCEED on success. If it fails, EINA_LOCK_FAIL is returned.

See also
  eina_rwlock_take_read()
  eina_rwlock_take_write()

## ◆ eina_tls_new()

static Eina_Bool eina_tls_new | ( | Eina_TLS * | key | ) |
| inlinestatic

Initializes a new Eina_TLS, or thread level storage, to store thread specific data.

This function initializes an Eina_TLS with `key` but does not set a callback to deallocate `key` when the thread exits. The implementation is platform dependent as is the structure of the Eina_TLS itself.

Parameters

  [in] | key | The Eina_TLS to be initialized.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

Note
  use eina_tls_cb_new() instead to set a callback for deallocating `key`.

See also
  eina_tls_cb_new()
  eina_tls_free()

## ◆ eina_tls_cb_new()

static Eina_Bool eina_tls_cb_new | ( | Eina_TLS * | key,
|  | Eina_TLS_Delete_Cb | delete_cb
| ) |  |
| inlinestatic

Initializes a new Eina_TLS, or thread level storage, to store thread specific data.

This function initializes an Eina_TLS with `key` and sets a callback to deallocate `key` when the thread exits. The implementation is platform dependent as is the structure of the Eina_TLS itself.

Parameters

  [in] | key | The Eina_TLS to be initialized.
  [in] | delete_cb | A pointer to a function that deallocates `key`.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_tls_new()
  eina_tls_free()

## ◆ eina_tls_free()

static void eina_tls_free | ( | Eina_TLS | key | ) |
| inlinestatic

Frees an allocated Eina_TLS.

This function frees the Eina_TLS `key`. The implementation is platform dependent.

Parameters

  [in] | key | The Eina_TLS to be freed.

See also
  eina_tls_new()
  eina_tls_cb_new()

## ◆ eina_tls_get()

static void * eina_tls_get | ( | Eina_TLS | key | ) |
| inlinestatic

Gets the value in Eina_TLS for this thread.

This function gets a pointer to the data associated with Eina_TLS `key` for this thread. The implementation is platform dependent.

Parameters

  [in] | key | The Eina_TLS to be retrieved.

Returns
  A pointer to the data associated with `key`.

See also
  eina_tls_set()

## ◆ eina_tls_set()

static Eina_Bool eina_tls_set | ( | Eina_TLS | key,
|  | const void * | data
| ) |  |
| inlinestatic

Sets the value in Eina_TLS for this thread.

This function sets the value associated with `key` to the pointer to the data `data`. The implementation is platform dependent.

Parameters

  [in] | key | The Eina_TLS to be set.
  [in] | data | A pointer to the data to be stored.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_tls_get()

## ◆ eina_semaphore_new()

static Eina_Bool eina_semaphore_new | ( | Eina_Semaphore * | sem,
|  | int | count_init
| ) |  |
| inlinestatic

Initializes a new Eina_Semaphore.

This function initializes an unnamed Eina_Semaphore with appropriate values. These values are platform dependent.

Parameters

  [in] | sem | The Eina_Semaphore to be initialized.
  [in] | count_init | Indicates the initial count of threads waiting on this semaphore.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_semaphore_free()

## ◆ eina_semaphore_free()

static Eina_Bool eina_semaphore_free | ( | Eina_Semaphore * | sem | ) |
| inlinestatic

Frees an allocated Eina_Semaphore.

This function frees the Eina_Semaphore `sem`. The implementation is platform dependent.

Parameters

  [in] | sem | The Eina_Semaphore to be freed.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_semaphore_new()

## ◆ eina_semaphore_lock()

static Eina_Bool eina_semaphore_lock | ( | Eina_Semaphore * | sem | ) |
| inlinestatic

Gets a lock on an Eina_Semaphore.

This function locks the Eina_Semaphore `sem`. The implementation is platform dependent.

Parameters

  [in] | sem | The Eina_Semaphore to lock.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_semaphore_release()

## ◆ eina_semaphore_release()

static Eina_Bool eina_semaphore_release | ( | Eina_Semaphore * | sem,
|  | int | count_release
| ) |  |
| inlinestatic

Releases a lock on an Eina_Semaphore.

This function releases a lock on the Eina_Semaphore `sem`. The implementation is platform dependent.

Parameters

  [in] | sem | The Eina_Semaphore to release.
  [in] | count_release | Not used.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_semaphore_lock()

## ◆ eina_barrier_new()

static Eina_Bool eina_barrier_new | ( | Eina_Barrier * | barrier,
|  | int | needed
| ) |  |
| inlinestatic

Initializes a new Eina_Barrier.

This function initializes a new Eina_Barrier. It sets the `needed` flag to the value of `needed`, sets the barrier's `count` member to 0 and creates new Eina_Lock and Eina_Condition objects for the barrier.

Parameters

  [in] | barrier | The Eina_Barrier to be initialized.
  [in] | needed | The number of thread waits that causes this barrier to be reset.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

See also
  eina_barrier_free()

## ◆ eina_barrier_free()

static void eina_barrier_free | ( | Eina_Barrier * | barrier | ) |
| inlinestatic

Frees an allocated Eina_Barrier.

This function frees the Eina_Barrier `barrier`.

Parameters

  [in] | barrier | The Eina_Barrier to be freed.

See also
  eina_barrier_new()

## ◆ eina_barrier_wait()

static Eina_Bool eina_barrier_wait | ( | Eina_Barrier * | barrier | ) |
| inlinestatic

Increments the count of threads that are waiting on `barrier`.

When the count of threads reaches the `needed` value for the barrier, all waiting threads are notified via eina_condition_broadcast().

Parameters

  [in] | barrier | The Eina_Barrier to be incremented.

Returns
  EINA_TRUE on success, else EINA_FALSE otherwise.

## ◆ eina_spinlock_new()

static Eina_Bool eina_spinlock_new | ( | Eina_Spinlock * | spinlock | ) |
| inlinestatic

Initializes a new Eina_Spinlock.

This function initializes a new Eina_Spinlock, if spinlocks are available. If spinlocks are not available, it creates a new Eina_Lock.

Parameters

  [in] | spinlock | The Eina_Spinlock to be initialized.

Returns
  EINA_TRUE on success, EINA_FALSE otherwise.

Note
  Spinlocks are only implemented on the POSIX platform and are only available if `EINA_HAVE_POSIX_SPINLOCK` is defined. You get a new Eina_Lock on All other platforms.

See also
  eina_spinlock_free()

## ◆ eina_spinlock_take()

static Eina_Lock_Result eina_spinlock_take | ( | Eina_Spinlock * | spinlock | ) |
| inlinestatic

Attempts to take a spinlock.

This function attempts to gain a lock on the indicated Eina_Spinlock. If the underlying Eina_Spinlock is locked already, this call can be blocked until the lock is released. This is appropriate in many cases, but consider using eina_spinlock_take_try() if you don't need to block.

Parameters

  [in] | spinlock | The Eina_Spinlock to take.

Returns
  Returns EINA_LOCK_SUCCEED on success. If the operation fails because a deadlock condition exists, it returns EINA_LOCK_DEADLOCK. If some other condition causes the take to fail, EINA_LOCK_FAIL is returned.

See also
  eina_spinlock_take_try()
  eina_spinlock_release()

## ◆ eina_spinlock_take_try()

static Eina_Lock_Result eina_spinlock_take_try | ( | Eina_Spinlock * | spinlock | ) |
| inlinestatic

Attempts to take a spinlock if possible.

This function attempts to gain a lock on the indicated Eina_Spinlock. Identical to eina_lock_take(), but returns immediately if the lock is already taken.

Parameters

  [in] | spinlock | The Eina_Spinlock to take.

Returns
  Returns EINA_LOCK_SUCCEED on success. If the operation fails because a deadlock condition exists, it returns EINA_LOCK_DEADLOCK. If some other condition causes the take to fail, EINA_LOCK_FAIL is returned.

See also
  eina_spinlock_take_try()
  eina_spinlock_release()

## ◆ eina_spinlock_release()

static Eina_Lock_Result eina_spinlock_release | ( | Eina_Spinlock * | spinlock | ) |
| inlinestatic

Releases a spinlock.

This function will release the lock on the indicated Eina_Spinlock. If successful, and `EINA_HAVE_DEBUG_THREADS` is defined, `mutex` is updated and information about the locking process is removed (e.g. thread number and backtrace for POSIX).

Parameters

  [in] | spinlock | The Eina_Spinlock to release.

Returns
  Returns EINA_LOCK_SUCCEED on success, EINA_LOCK_FAIL otherwise.

See also
  eina_spinlock_take()
  eina_spinlock_take_try()

## ◆ eina_spinlock_free()

static void eina_spinlock_free | ( | Eina_Spinlock * | spinlock | ) |
| inlinestatic

Deallocates an Eina_Spinlock.

This function deallocates an Eina_Spinlock and does any platform dependent cleanup that is required.

Parameters

  [in] | spinlock | The Eina_Spinlock to be deallocated.