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sysv_sem.c (11626) sysv_sem.c (12819)
1/* $Id: sysv_sem.c,v 1.9 1995/09/09 18:10:07 davidg Exp $ */
1/* $Id: sysv_sem.c,v 1.10 1995/10/21 19:49:59 bde Exp $ */
2
3/*
4 * Implementation of SVID semaphores
5 *
6 * Author: Daniel Boulet
7 *
8 * This software is provided ``AS IS'' without any warranties of any kind.
9 */

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21
22struct semctl_args;
23static int semctl __P((struct proc *p, struct semctl_args *uap, int *retval));
24struct semget_args;
25static int semget __P((struct proc *p, struct semget_args *uap, int *retval));
26struct semop_args;
27static int semop __P((struct proc *p, struct semop_args *uap, int *retval));
28struct semconfig_args;
2
3/*
4 * Implementation of SVID semaphores
5 *
6 * Author: Daniel Boulet
7 *
8 * This software is provided ``AS IS'' without any warranties of any kind.
9 */

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21
22struct semctl_args;
23static int semctl __P((struct proc *p, struct semctl_args *uap, int *retval));
24struct semget_args;
25static int semget __P((struct proc *p, struct semget_args *uap, int *retval));
26struct semop_args;
27static int semop __P((struct proc *p, struct semop_args *uap, int *retval));
28struct semconfig_args;
29static int semconfig __P((struct proc *p, struct semconfig_args *uap, int *retval));
29static int semconfig __P((struct proc *p, struct semconfig_args *uap,
30 int *retval));
30
31
31struct sem_undo *semu_alloc __P((struct proc *p));
32int semundo_adjust __P((struct proc *p, struct sem_undo **supptr, int semid, int semnum, int adjval));
33void semundo_clear __P((int semid, int semnum));
34void semexit __P((struct proc *p));
32static struct sem_undo *semu_alloc __P((struct proc *p));
33static int semundo_adjust __P((struct proc *p, struct sem_undo **supptr,
34 int semid, int semnum, int adjval));
35static void semundo_clear __P((int semid, int semnum));
36static void semexit __P((struct proc *p));
35
36/* XXX casting to (sy_call_t *) is bogus, as usual. */
37
38/* XXX casting to (sy_call_t *) is bogus, as usual. */
37sy_call_t *semcalls[] = {
39static sy_call_t *semcalls[] = {
38 (sy_call_t *)semctl, (sy_call_t *)semget,
39 (sy_call_t *)semop, (sy_call_t *)semconfig
40};
41
40 (sy_call_t *)semctl, (sy_call_t *)semget,
41 (sy_call_t *)semop, (sy_call_t *)semconfig
42};
43
42int semtot = 0;
44static int semtot = 0;
43struct semid_ds *sema; /* semaphore id pool */
44struct sem *sem; /* semaphore pool */
45struct semid_ds *sema; /* semaphore id pool */
46struct sem *sem; /* semaphore pool */
45struct map *semmap; /* semaphore allocation map */
46struct sem_undo *semu_list; /* list of active undo structures */
47static struct map *semmap; /* semaphore allocation map */
48static struct sem_undo *semu_list; /* list of active undo structures */
47int *semu; /* undo structure pool */
48
49static struct proc *semlock_holder = NULL;
50
51void
52seminit(dummy)
53 void *dummy;
54{

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143 return(eval);
144}
145
146/*
147 * Allocate a new sem_undo structure for a process
148 * (returns ptr to structure or NULL if no more room)
149 */
150
49int *semu; /* undo structure pool */
50
51static struct proc *semlock_holder = NULL;
52
53void
54seminit(dummy)
55 void *dummy;
56{

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145 return(eval);
146}
147
148/*
149 * Allocate a new sem_undo structure for a process
150 * (returns ptr to structure or NULL if no more room)
151 */
152
151struct sem_undo *
153static struct sem_undo *
152semu_alloc(p)
153 struct proc *p;
154{
155 register int i;
156 register struct sem_undo *suptr;
157 register struct sem_undo **supptr;
158 int attempt;
159

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213 }
214 return (NULL);
215}
216
217/*
218 * Adjust a particular entry for a particular proc
219 */
220
154semu_alloc(p)
155 struct proc *p;
156{
157 register int i;
158 register struct sem_undo *suptr;
159 register struct sem_undo **supptr;
160 int attempt;
161

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215 }
216 return (NULL);
217}
218
219/*
220 * Adjust a particular entry for a particular proc
221 */
222
221int
223static int
222semundo_adjust(p, supptr, semid, semnum, adjval)
223 register struct proc *p;
224 struct sem_undo **supptr;
225 int semid, semnum;
226 int adjval;
227{
228 register struct sem_undo *suptr;
229 register struct undo *sunptr;

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280 suptr->un_cnt++;
281 sunptr->un_adjval = adjval;
282 sunptr->un_id = semid; sunptr->un_num = semnum;
283 } else
284 return(EINVAL);
285 return(0);
286}
287
224semundo_adjust(p, supptr, semid, semnum, adjval)
225 register struct proc *p;
226 struct sem_undo **supptr;
227 int semid, semnum;
228 int adjval;
229{
230 register struct sem_undo *suptr;
231 register struct undo *sunptr;

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282 suptr->un_cnt++;
283 sunptr->un_adjval = adjval;
284 sunptr->un_id = semid; sunptr->un_num = semnum;
285 } else
286 return(EINVAL);
287 return(0);
288}
289
288void
290static void
289semundo_clear(semid, semnum)
290 int semid, semnum;
291{
292 register struct sem_undo *suptr;
293
294 for (suptr = semu_list; suptr != NULL; suptr = suptr->un_next) {
295 register struct undo *sunptr = &suptr->un_ent[0];
296 register int i = 0;

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858 *retval = 0;
859 return(0);
860}
861
862/*
863 * Go through the undo structures for this process and apply the adjustments to
864 * semaphores.
865 */
291semundo_clear(semid, semnum)
292 int semid, semnum;
293{
294 register struct sem_undo *suptr;
295
296 for (suptr = semu_list; suptr != NULL; suptr = suptr->un_next) {
297 register struct undo *sunptr = &suptr->un_ent[0];
298 register int i = 0;

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860 *retval = 0;
861 return(0);
862}
863
864/*
865 * Go through the undo structures for this process and apply the adjustments to
866 * semaphores.
867 */
866void
868static void
867semexit(p)
868 struct proc *p;
869{
870 register struct sem_undo *suptr;
871 register struct sem_undo **supptr;
872 int did_something;
873
874 /*

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870 struct proc *p;
871{
872 register struct sem_undo *suptr;
873 register struct sem_undo **supptr;
874 int did_something;
875
876 /*

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