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/*
* Copyright (C) 2009 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup thread thread
* @{ @ingroup threading
*/
#ifndef THREADING_THREAD_H_
#define THREADING_THREAD_H_
#include <utils/utils.h>
typedef struct thread_t thread_t;
/**
* Main function of a thread.
*
* @param arg argument provided to constructor
* @return value provided to threads joining the terminating thread
*/
typedef void *(*thread_main_t)(void *arg);
/**
* Cleanup callback function for a thread.
*
* @param arg argument provided to thread_cleanup_push
*/
typedef void (*thread_cleanup_t)(void *arg);
/**
* Thread wrapper implements simple, portable and advanced thread functions.
*
* @note All threads other than the main thread need either to be joined or
* detached by calling the corresponding method.
*/
struct thread_t {
/**
* Cancel this thread.
*/
void (*cancel)(thread_t *this);
/**
* Send a signal to this thread.
*
* @param sig the signal to be sent to this thread
*/
void (*kill)(thread_t *this, int sig);
/**
* Detach this thread, this automatically destroys the thread object after
* the thread returned from its main function.
*
* @note Calling detach is like calling destroy on other objects.
*/
void (*detach)(thread_t *this);
/**
* Join this thread, this automatically destroys the thread object
* afterwards.
*
* @note Calling join is like calling destroy on other objects.
*
* @return the value returned from the thread's main function or
* a call to exit.
*/
void *(*join)(thread_t *this);
};
/**
* Create a new thread instance.
*
* @param main thread main function
* @param arg argument provided to the main function
* @return thread instance
*/
thread_t *thread_create(thread_main_t main, void *arg);
/**
* Get a thread object for the current thread.
*
* @return thread instance
*/
thread_t *thread_current();
/**
* Get the ID of the current thread.
*
* Depending on the build configuration thread IDs are either assigned
* incrementally starting from 1, or equal the value returned by an appropriate
* syscall (like gettid() or GetCurrentThreadId()), if available.
*
* @return ID of the current thread
*/
u_int thread_current_id();
/**
* Push a function onto the current thread's cleanup handler stack.
* The callback function is called whenever the thread is cancelled, exits or
* thread_cleanup_pop is called with TRUE as execute argument.
*
* @param cleanup function called on thread exit
* @param arg argument provided to the callback
*/
void thread_cleanup_push(thread_cleanup_t cleanup, void *arg);
/**
* Remove the top function from the current thread's cleanup handler stack
* and optionally execute it.
*
* @param execute TRUE to execute the function
*/
void thread_cleanup_pop(bool execute);
/**
* Pop and execute all cleanup handlers in reverse order of registration.
*
* This function is for very special purposes only, where the caller exactly
* knows which cleanup handlers have been pushed. For regular use, a caller
* should thread_cleanup_pop() exactly the number of handlers it pushed
* using thread_cleanup_push().
*/
void thread_cleanup_popall();
/**
* Enable or disable the cancelability of the current thread. The current
* value is returned.
*
* @param enable TRUE to enable cancelability
* @return the current state of the cancelability
*/
bool thread_cancelability(bool enable);
/**
* Force creation of a cancellation point in the calling thread.
*
* This temporarily enables thread cancelability, tests for a pending
* cancellation request and then disables cancelability again if it was
* disabled before the call to thread_cancellation_point().
*/
void thread_cancellation_point();
/**
* Exit the current thread.
*
* @param val value provided to threads joining the current thread
*/
void thread_exit(void *val);
/**
* Called by the main thread to initialize the thread management.
*/
void threads_init();
/**
* Called by the main thread to deinitialize the thread management.
*/
void threads_deinit();
#endif /** THREADING_THREAD_H_ @} */
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