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/*
* Copyright (C) 2014 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup pthread
* @{
* @file
* @brief Synchronization barriers.
* @note Do not include this header file directly, but pthread.h.
*/
#ifndef SYS__POSIX__PTHREAD_BARRIER__H
#define SYS__POSIX__PTHREAD_BARRIER__H
#include "mutex.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @def PTHREAD_PROCESS_SHARED
* @brief Share the structure with child processes (default).
* @note RIOT is a single-process OS.
* Setting the value of `pshared` does not change anything.
*/
#define PTHREAD_PROCESS_SHARED (0)
/**
* @def PTHREAD_PROCESS_PRIVATE
* @brief Don't share the structure with child processes.
* @note RIOT is a single-process OS.
* Setting the value of `pshared` does not change anything.
*/
#define PTHREAD_PROCESS_PRIVATE (1)
/**
* @brief Internal structure to store the list of waiting threads.
*/
typedef struct pthread_barrier_waiting_node
{
struct pthread_barrier_waiting_node *next; /**< The next waiting thread. */
kernel_pid_t pid; /**< The current thread to wake up. */
volatile int cont; /**< 0 = spurious wake up, 1 = wake up */
} pthread_barrier_waiting_node_t;
/**
* @brief A synchronization barrier.
* @details Initialize with pthread_barrier_init().
* For a zeroed out datum you do not need to call the initializer,
* it is enough to set pthread_barrier_t::count.
*/
typedef struct
{
struct pthread_barrier_waiting_node *next; /**< The first waiting thread. */
mutex_t mutex; /**< Mutex to unlock to wake the thread up. */
volatile int count; /**< Wait for N more threads before waking everyone up. */
} pthread_barrier_t;
/**
* @brief Details for a pthread_barrier_t.
* @details RIOT does not need this structure, because it is a single process OS.
* This is only here to POSIX compatibility.
*/
typedef struct
{
int pshared; /**< See pthread_barrierattr_setpshared() and pthread_barrierattr_getpshared(). */
} pthread_barrierattr_t;
/**
* @brief Initializes a pthread_barrier_t
* @param barrier Datum to initialize
* @param attr (unused)
* @param count Number of thread to wait for
* @returns 0, the invocation cannot fail
*/
int pthread_barrier_init(pthread_barrier_t *barrier,
const pthread_barrierattr_t *attr,
unsigned int count);
/**
* @brief Destroys a pthread_barrier_t
* @details To use the barrier again you will need to call pthread_barrier_init() again.
* Destroying a barrier while threads are currently waiting for it causes indefined behavior.
* @param barrier Barrier to destoy
* @returns 0, the invocation cannot fail
*/
int pthread_barrier_destroy(pthread_barrier_t *barrier);
/**
* @brief Waiting on a synchronization barrier
* @details The barrier need to be initialized with pthread_barrier_init().
* @param barrier Barrier to wait for
* @returns 0, the invocation cannot fail
*/
int pthread_barrier_wait(pthread_barrier_t *barrier);
/**
* @brief Initialize a pthread_barrierattr_t
* @details A zeroed out datum is initialized.
* @param attr Datum to initialize.
* @returns 0, the invocation cannot fail
*/
int pthread_barrierattr_init(pthread_barrierattr_t *attr);
/**
* @brief Destroy a pthread_barrierattr_t
* @details This function does nothing.
* @param attr Datum to destroy
* @returns 0, the invocation cannot fail
*/
int pthread_barrierattr_destroy(pthread_barrierattr_t *attr);
/**
* @brief Returns whether the barrier attribute was set to be shared
* @param attr Barrier attribute to read
* @param pshared The value previously stored with pthread_barrierattr_setpshared().
* @returns 0, the invocation cannot fail
*/
int pthread_barrierattr_getpshared(const pthread_barrierattr_t *attr, int *pshared);
/**
* @brief Set if the barrier should be shared with child processes
* @details Since RIOT is a single process OS, pthread_barrier_init() wil ignore the value.
* @param attr Attribute set for pthread_barrier_init()
* @param pshared Either #PTHREAD_PROCESS_PRIVATE or #PTHREAD_PROCESS_SHARED
* @returns 0, the invocation cannot fail
*/
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared);
#ifdef __cplusplus
}
#endif
#endif /* SYS__POSIX__PTHREAD_BARRIER__H */
/**
* @}
*/
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