note 30891 added to ref.sem

If you going to work with semaphore, which was created by some external program, you can try the following code for this program (C example): #define SVSEM_MODE (SEM_R | SEM_A | SEM_R>>3 | SEM_R>>6) /* 0644 */ #define PHP_SEM_NEED_NUMBER 3 /*.......*/ int semid, semflag = SVSEM_MODE | IPC_CREAT | IPC_EXCL; struct sembuf semptr; union semun semopts; /*.......*/ if( (semid = semget(sempath, PHP_SEM_NEED_NUMBER, semflag)) >= 0 ) { semopts.val = 1; /* initial value for sem */ if( semctl( semid, 0, SETVAL, semopts) < 0 ) {/*error*/} if( semctl( semid, 1, SETVAL, semopts) < 0 ) {/*error*/} /* PHP wanna zero for its own semget at third sem. * look at ./PHP_SOURCE_PATH/ext/sysvsem/sysvsem.c */ semopts.val = 0; if( semctl( semid, 2, SETVAL, semopts) < 0 ) {/*error*/} } else if(errno == EEXIST) { /* connect only */ if( (semid = semget(sempath, PHP_SEM_NEED_NUMBER, SVSEM_MODE | IPC_CREAT)) < 0 ) {/*error*/} } else {/*error*/} /*.......*/ /* If you want acquire the sem */ semptr.sem_num = 0; semptr.sem_op = -1; /* lock it */ semptr.sem_flg = SEM_UNDO; while( semop(semid, &semptr, 1) < 0 ) {/*error*/} /*.......*/ Thanks, Roma -- http://www.php.net/manual/en/ref.sem.php http://master.php.net/manage/user-notes.php?action=edit+30891 http://master.php.net/manage/user-notes.php?action=delete+30891 http://master.php.net/manage/user-notes.php?action=reject+30891