pthread_barrier.h File Reference

Synchronization barriers. More...

Detailed Description

Synchronization barriers.

Note

Do not include this header file directly, but pthread.h.

Definition in file pthread_barrier.h.

#include "mutex.h"

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Data Structures
struct	pthread_barrier_waiting_node
	Internal structure to store the list of waiting threads. More...
struct	pthread_barrier_t
	A synchronization barrier. More...
struct	pthread_barrierattr_t
	Details for a pthread_barrier_t. More...
#define	PTHREAD_PROCESS_SHARED   (0)
	Share the structure with child processes (default). More...
#define	PTHREAD_PROCESS_PRIVATE   (1)
	Don't share the structure with child processes. More...
typedef struct pthread_barrier_waiting_node	pthread_barrier_waiting_node_t
	Internal structure to store the list of waiting threads.
int	pthread_barrier_init (pthread_barrier_t *barrier, const pthread_barrierattr_t *attr, unsigned int count)
	Initializes a pthread_barrier_t. More...
int	pthread_barrier_destroy (pthread_barrier_t *barrier)
	Destroys a pthread_barrier_t. More...
int	pthread_barrier_wait (pthread_barrier_t *barrier)
	Waiting on a synchronization barrier. More...
int	pthread_barrierattr_init (pthread_barrierattr_t *attr)
	Initialize a pthread_barrierattr_t. More...
int	pthread_barrierattr_destroy (pthread_barrierattr_t *attr)
	Destroy a pthread_barrierattr_t. More...
int	pthread_barrierattr_getpshared (const pthread_barrierattr_t *attr, int *pshared)
	Returns whether the barrier attribute was set to be shared. More...
int	pthread_barrierattr_setpshared (pthread_barrierattr_t *attr, int pshared)
	Set if the barrier should be shared with child processes. More...

Macro Definition Documentation

PTHREAD_PROCESS_PRIVATE

#define PTHREAD_PROCESS_PRIVATE   (1)

Don't share the structure with child processes.

Note

RIOT is a single-process OS. Setting the value of pshared does not change anything.

Definition at line 39 of file pthread_barrier.h.

PTHREAD_PROCESS_SHARED

#define PTHREAD_PROCESS_SHARED   (0)

Share the structure with child processes (default).

Note

RIOT is a single-process OS. Setting the value of pshared does not change anything.

Definition at line 32 of file pthread_barrier.h.

Function Documentation

pthread_barrier_destroy()

int pthread_barrier_destroy

(

pthread_barrier_t *

barrier

)

Destroys a pthread_barrier_t.

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.

Parameters

barrier

Barrier to destoy

Returns

0, the invocation cannot fail

pthread_barrier_init()

int pthread_barrier_init	(	pthread_barrier_t *	barrier,
		const pthread_barrierattr_t *	attr,
		unsigned int	count
	)

Initializes a pthread_barrier_t.

Parameters

barrier	Datum to initialize
attr	(unused)
count	Number of thread to wait for

Returns

0, the invocation cannot fail

pthread_barrier_wait()

int pthread_barrier_wait

(

pthread_barrier_t *

barrier

)

Waiting on a synchronization barrier.

The barrier need to be initialized with pthread_barrier_init().

Parameters

barrier

Barrier to wait for

Returns

0, the invocation cannot fail

pthread_barrierattr_destroy()

int pthread_barrierattr_destroy

(

pthread_barrierattr_t *

attr

)

Destroy a pthread_barrierattr_t.

This function does nothing.

Parameters

attr	Datum to destroy

Returns

0, the invocation cannot fail

pthread_barrierattr_getpshared()

int pthread_barrierattr_getpshared	(	const pthread_barrierattr_t *	attr,
		int *	pshared
	)

Returns whether the barrier attribute was set to be shared.

Parameters

attr	Barrier attribute to read
pshared	The value previously stored with pthread_barrierattr_setpshared().

Returns

0, the invocation cannot fail

pthread_barrierattr_init()

int pthread_barrierattr_init

(

pthread_barrierattr_t *

attr

)

Initialize a pthread_barrierattr_t.

A zeroed out datum is initialized.

Parameters

attr	Datum to initialize.

Returns

0, the invocation cannot fail

pthread_barrierattr_setpshared()

int pthread_barrierattr_setpshared	(	pthread_barrierattr_t *	attr,
		int	pshared
	)

Set if the barrier should be shared with child processes.

Since RIOT is a single process OS, pthread_barrier_init() will ignore the value.

Parameters

attr	Attribute set for pthread_barrier_init()
pshared	Either PTHREAD_PROCESS_PRIVATE or PTHREAD_PROCESS_SHARED

Returns

0, the invocation cannot fail