svsem/binary_sems.h

This is svsem/binary_sems.h (Listing 47-9, page 989), an example from the book, The Linux Programming Interface.

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#ifndef BINARY_SEMS_H           /* Prevent accidental double inclusion */
#define BINARY_SEMS_H

#include "tlpi_hdr.h"

/* Variables controlling operation of functions below */

extern Boolean bsUseSemUndo;            /* Use SEM_UNDO during semop()? */
extern Boolean bsRetryOnEintr;          /* Retry if semop() interrupted by
                                           signal handler? */

int initSemAvailable(int semId, int semNum);

int initSemInUse(int semId, int semNum);

int reserveSem(int semId, int semNum);

int releaseSem(int semId, int semNum);

#endif

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