sem.h File Reference

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include "log.h"
#include "types.h"

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Macros
#define	_GNU_SOURCE

Functions
int	create_sem (void)
int	remove_sem (int sem_id)
int	open_sem (void)
int	wait_sem (int sem_id, int sem_num, int time_out)
int	set_sem (int sem_id, int sem_num, int val)

Macro Definition Documentation

#define _GNU_SOURCE

Copyright (c) 2016-2017, ETH Zurich, Computer Engineering Group

Definition at line 5 of file sem.h.

Function Documentation

int create_sem

(

void

)

Copyright (c) 2016-2017, ETH Zurich, Computer Engineering Group Create RocketLogger semaphore set

Returns

ID of created set

Definition at line 11 of file sem.c.

References ERROR, NUM_SEMS, rl_log(), sem_id, and SEM_KEY.

Referenced by pru_sample().

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int open_sem

(

void

)

Open existing RocketLogger semaphore set

Returns

ID of opened set

Definition at line 37 of file sem.c.

References ERROR, NUM_SEMS, rl_log(), sem_id, and SEM_KEY.

Referenced by main().

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int remove_sem

(

int

sem_id

)

Remove semaphore set

Parameters

sem_id

ID of set to remove

Returns

SUCCESS on success, FAILURE otherwise

Definition at line 24 of file sem.c.

References DATA_SEM, ERROR, FAILURE, rl_log(), and SUCCESS.

Referenced by pru_sample().

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int set_sem	(	int	sem_id,
		int	sem_num,
		int	val
	)

Set value to semaphore

Parameters

sem_id	ID of semaphore set
sem_num	Number of semaphore in set
val	Value to be set to semaphore

Returns

SUCCESS on success (access granted), TIME_OUT on time out, FAILURE otherwise

Definition at line 85 of file sem.c.

References ERROR, FAILURE, NO_FLAG, rl_log(), SEM_SET_TIME_OUT, SUCCESS, and TIME_OUT.

Referenced by handle_data_buffer(), main(), print_data(), and pru_sample().

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int wait_sem	(	int	sem_id,
		int	sem_num,
		int	time_out
	)

Wait on a semaphore until access granted

Parameters

sem_id	ID of semaphore set
sem_num	Number of semaphore in set
time_out	Maximum waiting time

Returns

SUCCESS on success (access granted), TIME_OUT on time out, FAILURE otherwise

Definition at line 52 of file sem.c.

References ERROR, FAILURE, INFO, NO_FLAG, rl_log(), SUCCESS, TIME_OUT, and WARNING.

Referenced by handle_data_buffer(), main(), and print_data().

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