#include <sys/types.h>

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Macros
#define	SEM_KEY 2222
	Semaphore key (used for set creation) More...

#define	SEM_OPT_NO_FLAG 0
	Time out time in seconds, waiting on semaphore write. More...

#define	SEM_TIMEOUT_READ 3
	Time out time in seconds, waiting on semaphore read. More...

#define	SEM_TIMEOUT_WRITE 1
	Time out time in seconds, waiting on semaphore write. More...

#define	SEM_SEM_COUNT 2
	Total number of semaphores in set. More...

#define	SEM_INDEX_DATA 0
	Index of the data semaphore (protects shared memory accesses) More...

#define	SEM_INDEX_WAIT 1
	Index of the wait semaphore (blocks until new data is available) More...

Functions
int	sem_create (key_t key, int count)

int	sem_remove (int id)

int	sem_open (key_t key, int count)

int	sem_wait (int id, int index, int timeout)

int	sem_set (int id, int index, int value)

int	sem_get (int id, int index)

Macro Definition Documentation

◆ SEM_INDEX_DATA

#define SEM_INDEX_DATA 0

Index of the data semaphore (protects shared memory accesses)

Definition at line 49 of file sem.h.

◆ SEM_INDEX_WAIT

#define SEM_INDEX_WAIT 1

Index of the wait semaphore (blocks until new data is available)

Definition at line 51 of file sem.h.

◆ SEM_KEY

#define SEM_KEY 2222

Semaphore key (used for set creation)

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Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

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 HOLDER 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.

Definition at line 38 of file sem.h.

◆ SEM_OPT_NO_FLAG

#define SEM_OPT_NO_FLAG 0

Time out time in seconds, waiting on semaphore write.

Definition at line 40 of file sem.h.

◆ SEM_SEM_COUNT

#define SEM_SEM_COUNT 2

Total number of semaphores in set.

Definition at line 47 of file sem.h.

◆ SEM_TIMEOUT_READ

#define SEM_TIMEOUT_READ 3

Time out time in seconds, waiting on semaphore read.

Definition at line 42 of file sem.h.

◆ SEM_TIMEOUT_WRITE

#define SEM_TIMEOUT_WRITE 1

Time out time in seconds, waiting on semaphore write.

Definition at line 44 of file sem.h.

Function Documentation

◆ sem_create()

int sem_create	(	key_t	key,
		int	count
	)

Create RocketLogger semaphore set.

Parameters

key	The key identifying the semaphore set to create
count	The number of semaphores in the set to create

Returns: ID of created set on success, negative on failure with errno set accordingly

Definition at line 49 of file sem.c.

References rl_log(), and RL_LOG_ERROR.

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◆ sem_get()

int sem_get	(	int	id,
		int	index
	)

Get value of a semaphore.

Parameters

id	ID of semaphore set
index	Index of semaphore in set

Returns: The semaphore count, or negative on failure with errno set accordingly

Definition at line 129 of file sem.c.

References rl_log(), and RL_LOG_ERROR.

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◆ sem_open()

int sem_open	(	key_t	key,
		int	count
	)

Open existing RocketLogger semaphore set.

Parameters

key	The key identifying the semaphore set
count	The number of semaphores in the set

Returns: ID of opened set, negative on failure with errno set accordingly

Definition at line 68 of file sem.c.

References rl_log(), and RL_LOG_ERROR.

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◆ sem_remove()

int sem_remove ( int id )

Remove semaphore set.

Parameters

id	ID of set to remove

Returns: Returns 0 on success, negative on failure with errno set accordingly

Definition at line 58 of file sem.c.

References rl_log(), RL_LOG_ERROR, and SUCCESS.

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◆ sem_set()

int sem_set	(	int	id,
		int	index,
		int	value
	)

Set value to semaphore.

Parameters

id	ID of semaphore set
index	Index of semaphore in set
value	Value to be set to semaphore

Returns: Returns 0 on success, negative on failure with errno set accordingly

Definition at line 108 of file sem.c.

References rl_log(), RL_LOG_ERROR, SEM_OPT_NO_FLAG, SEM_TIMEOUT_WRITE, and SUCCESS.

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◆ sem_wait()

int sem_wait	(	int	id,
		int	index,
		int	timeout
	)

Wait on a semaphore until access granted.

Parameters

id	ID of semaphore set
index	Index of semaphore in set
timeout	Maximum waiting time before failing in seconds

Returns: Returns 0 on success, negative on failure with errno set accordingly

Definition at line 78 of file sem.c.

References rl_log(), RL_LOG_ERROR, SEM_OPT_NO_FLAG, and SUCCESS.

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Macros

Functions

Macro Definition Documentation

◆ SEM_INDEX_DATA

◆ SEM_INDEX_WAIT

◆ SEM_KEY

◆ SEM_OPT_NO_FLAG

◆ SEM_SEM_COUNT

◆ SEM_TIMEOUT_READ

◆ SEM_TIMEOUT_WRITE

Function Documentation

◆ sem_create()

◆ sem_get()

◆ sem_open()

◆ sem_remove()

◆ sem_set()

◆ sem_wait()