mirror of
https://github.com/opencv/opencv.git
synced 2024-12-06 02:29:14 +08:00
0c84b91dde
- https://github.com/uclouvain/openjpeg/releases/tag/v2.3.1 - src/lib/openjp2 - readme files
257 lines
8.4 KiB
C
257 lines
8.4 KiB
C
/*
|
|
* The copyright in this software is being made available under the 2-clauses
|
|
* BSD License, included below. This software may be subject to other third
|
|
* party and contributor rights, including patent rights, and no such rights
|
|
* are granted under this license.
|
|
*
|
|
* Copyright (c) 2016, Even Rouault
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef THREAD_H
|
|
#define THREAD_H
|
|
|
|
#include "openjpeg.h"
|
|
|
|
/**
|
|
@file thread.h
|
|
@brief Thread API
|
|
|
|
The functions in thread.c have for goal to manage mutex, conditions, thread
|
|
creation and thread pools that accept jobs.
|
|
*/
|
|
|
|
/** @defgroup THREAD THREAD - Mutex, conditions, threads and thread pools */
|
|
/*@{*/
|
|
|
|
/** @name Mutex */
|
|
/*@{*/
|
|
|
|
/** Opaque type for a mutex */
|
|
typedef struct opj_mutex_t opj_mutex_t;
|
|
|
|
/** Creates a mutex.
|
|
* @return the mutex or NULL in case of error (can for example happen if the library
|
|
* is built without thread support)
|
|
*/
|
|
opj_mutex_t* opj_mutex_create(void);
|
|
|
|
/** Lock/acquire the mutex.
|
|
* @param mutex the mutex to acquire.
|
|
*/
|
|
void opj_mutex_lock(opj_mutex_t* mutex);
|
|
|
|
/** Unlock/release the mutex.
|
|
* @param mutex the mutex to release.
|
|
*/
|
|
void opj_mutex_unlock(opj_mutex_t* mutex);
|
|
|
|
/** Destroy a mutex
|
|
* @param mutex the mutex to destroy.
|
|
*/
|
|
void opj_mutex_destroy(opj_mutex_t* mutex);
|
|
|
|
/*@}*/
|
|
|
|
/** @name Condition */
|
|
/*@{*/
|
|
|
|
/** Opaque type for a condition */
|
|
typedef struct opj_cond_t opj_cond_t;
|
|
|
|
/** Creates a condition.
|
|
* @return the condition or NULL in case of error (can for example happen if the library
|
|
* is built without thread support)
|
|
*/
|
|
opj_cond_t* opj_cond_create(void);
|
|
|
|
/** Wait for the condition to be signaled.
|
|
* The semantics is the same as the POSIX pthread_cond_wait.
|
|
* The provided mutex *must* be acquired before calling this function, and
|
|
* released afterwards.
|
|
* The mutex will be released by this function while it must wait for the condition
|
|
* and reacquired afterwards.
|
|
* In some particular situations, the function might return even if the condition is not signaled
|
|
* with opj_cond_signal(), hence the need to check with an application level
|
|
* mechanism.
|
|
*
|
|
* Waiting thread :
|
|
* \code
|
|
* opj_mutex_lock(mutex);
|
|
* while( !some_application_level_condition )
|
|
* {
|
|
* opj_cond_wait(cond, mutex);
|
|
* }
|
|
* opj_mutex_unlock(mutex);
|
|
* \endcode
|
|
*
|
|
* Signaling thread :
|
|
* \code
|
|
* opj_mutex_lock(mutex);
|
|
* some_application_level_condition = TRUE;
|
|
* opj_cond_signal(cond);
|
|
* opj_mutex_unlock(mutex);
|
|
* \endcode
|
|
*
|
|
* @param cond the condition to wait.
|
|
* @param mutex the mutex (in acquired state before calling this function)
|
|
*/
|
|
void opj_cond_wait(opj_cond_t* cond, opj_mutex_t* mutex);
|
|
|
|
/** Signal waiting threads on a condition.
|
|
* One of the thread waiting with opj_cond_wait() will be waken up.
|
|
* It is strongly advised that this call is done with the mutex that is used
|
|
* by opj_cond_wait(), in a acquired state.
|
|
* @param cond the condition to signal.
|
|
*/
|
|
void opj_cond_signal(opj_cond_t* cond);
|
|
|
|
/** Destroy a condition
|
|
* @param cond the condition to destroy.
|
|
*/
|
|
void opj_cond_destroy(opj_cond_t* cond);
|
|
|
|
/*@}*/
|
|
|
|
/** @name Thread */
|
|
/*@{*/
|
|
|
|
/** Opaque type for a thread handle */
|
|
typedef struct opj_thread_t opj_thread_t;
|
|
|
|
/** User function to execute in a thread
|
|
* @param user_data user data provided with opj_thread_create()
|
|
*/
|
|
typedef void (*opj_thread_fn)(void* user_data);
|
|
|
|
/** Creates a new thread.
|
|
* @param thread_fn Function to run in the new thread.
|
|
* @param user_data user data provided to the thread function. Might be NULL.
|
|
* @return a thread handle or NULL in case of failure (can for example happen if the library
|
|
* is built without thread support)
|
|
*/
|
|
opj_thread_t* opj_thread_create(opj_thread_fn thread_fn, void* user_data);
|
|
|
|
/** Wait for a thread to be finished and release associated resources to the
|
|
* thread handle.
|
|
* @param thread the thread to wait for being finished.
|
|
*/
|
|
void opj_thread_join(opj_thread_t* thread);
|
|
|
|
/*@}*/
|
|
|
|
/** @name Thread local storage */
|
|
/*@{*/
|
|
/** Opaque type for a thread local storage */
|
|
typedef struct opj_tls_t opj_tls_t;
|
|
|
|
/** Get a thread local value corresponding to the provided key.
|
|
* @param tls thread local storage handle
|
|
* @param key key whose value to retrieve.
|
|
* @return value associated with the key, or NULL is missing.
|
|
*/
|
|
void* opj_tls_get(opj_tls_t* tls, int key);
|
|
|
|
/** Type of the function used to free a TLS value */
|
|
typedef void (*opj_tls_free_func)(void* value);
|
|
|
|
/** Set a thread local value corresponding to the provided key.
|
|
* @param tls thread local storage handle
|
|
* @param key key whose value to set.
|
|
* @param value value to set (may be NULL).
|
|
* @param free_func function to call currently installed value.
|
|
* @return OPJ_TRUE if successful.
|
|
*/
|
|
OPJ_BOOL opj_tls_set(opj_tls_t* tls, int key, void* value,
|
|
opj_tls_free_func free_func);
|
|
|
|
/*@}*/
|
|
|
|
/** @name Thread pool */
|
|
/*@{*/
|
|
|
|
/** Opaque type for a thread pool */
|
|
typedef struct opj_thread_pool_t opj_thread_pool_t;
|
|
|
|
/** Create a new thread pool.
|
|
* num_thread must nominally be >= 1 to create a real thread pool. If num_threads
|
|
* is negative or null, then a dummy thread pool will be created. All functions
|
|
* operating on the thread pool will work, but job submission will be run
|
|
* synchronously in the calling thread.
|
|
*
|
|
* @param num_threads the number of threads to allocate for this thread pool.
|
|
* @return a thread pool handle, or NULL in case of failure (can for example happen if the library
|
|
* is built without thread support)
|
|
*/
|
|
opj_thread_pool_t* opj_thread_pool_create(int num_threads);
|
|
|
|
/** User function to execute in a thread
|
|
* @param user_data user data provided with opj_thread_create()
|
|
* @param tls handle to thread local storage
|
|
*/
|
|
typedef void (*opj_job_fn)(void* user_data, opj_tls_t* tls);
|
|
|
|
|
|
/** Submit a new job to be run by one of the thread in the thread pool.
|
|
* The job ( thread_fn, user_data ) will be added in the queue of jobs managed
|
|
* by the thread pool, and run by the first thread that is no longer busy.
|
|
*
|
|
* @param tp the thread pool handle.
|
|
* @param job_fn Function to run. Must not be NULL.
|
|
* @param user_data User data provided to thread_fn.
|
|
* @return OPJ_TRUE if the job was successfully submitted.
|
|
*/
|
|
OPJ_BOOL opj_thread_pool_submit_job(opj_thread_pool_t* tp, opj_job_fn job_fn,
|
|
void* user_data);
|
|
|
|
/** Wait that no more than max_remaining_jobs jobs are remaining in the queue of
|
|
* the thread pool. The aim of this function is to avoid submitting too many
|
|
* jobs while the thread pool cannot cope fast enough with them, which would
|
|
* result potentially in out-of-memory situations with too many job descriptions
|
|
* being queued.
|
|
*
|
|
* @param tp the thread pool handle
|
|
* @param max_remaining_jobs maximum number of jobs allowed to be queued without waiting.
|
|
*/
|
|
void opj_thread_pool_wait_completion(opj_thread_pool_t* tp,
|
|
int max_remaining_jobs);
|
|
|
|
/** Return the number of threads associated with the thread pool.
|
|
*
|
|
* @param tp the thread pool handle.
|
|
* @return number of threads associated with the thread pool.
|
|
*/
|
|
int opj_thread_pool_get_thread_count(opj_thread_pool_t* tp);
|
|
|
|
/** Destroy a thread pool.
|
|
* @param tp the thread pool handle.
|
|
*/
|
|
void opj_thread_pool_destroy(opj_thread_pool_t* tp);
|
|
|
|
/*@}*/
|
|
|
|
/*@}*/
|
|
|
|
#endif /* THREAD_H */
|