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Commit88094f2

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committed
beos fixes from Cyril VELTER
1 parent5b0740d commit88094f2

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6 files changed

+261
-222
lines changed

6 files changed

+261
-222
lines changed

‎src/backend/port/beos/sem.c‎

Lines changed: 73 additions & 55 deletions
Original file line numberDiff line numberDiff line change
@@ -13,160 +13,179 @@
1313
#include<stdio.h>
1414
#include<errno.h>
1515
#include<OS.h>
16+
#include"utils/elog.h"
17+
18+
19+
/* Control of a semaphore pool. The pool is an area in which we stored all
20+
the semIds of the pool. The first 4 bytes are the number of semaphore allocated
21+
in the pool followed by SemIds */
1622

17-
// Controle d'un pool de sémaphores
18-
// On considere que le semId utilisé correspond bien a une area de notre adress space
19-
// Les informations du pool de sémaphore sont stockés dans cette area
2023
intsemctl(intsemId,intsemNum,intflag,unionsemunsemun)
2124
{
22-
23-
// Recherche de l'adresse de base de l'area
2425
int32*Address;
2526
area_infoinfo;
26-
//printf("semctl : semid %d, semnum %d, cmd %d\n",semId,semNum,flag);
27+
28+
/* Try to find the pool */
2729
if (get_area_info(semId,&info)!=B_OK)
2830
{
29-
//printf("areanot found\n");
31+
/* pool is invalid (BeOSareaid is invalid) */
3032
errno=EINVAL;
3133
return-1;
3234
}
35+
36+
/* Get the pool address */
3337
Address=(int32*)info.address;
3438

35-
// semnum peut etre égal à 0
36-
// semun.array contient la valeur de départ du sémaphore
3739

38-
// si flag = set_all il faut définir la valeur du sémaphore sue semun.array
40+
/* semNum might be 0 */
41+
/* semun.array contain the sem initial values */
42+
43+
/* Fix the count of all sem of the pool to semun.array */
3944
if (flag==SETALL)
4045
{
4146
longi;
42-
//printf("setall %d\n",Address[0]);
4347
for (i=0;i<Address[0];i++)
4448
{
4549
int32cnt;
50+
/* Get the current count */
4651
get_sem_count(Address[i+1],&cnt);
47-
//printf("Set de ALl %d %d = %d\n",Address[i+1],semun.array[i],cnt);
52+
53+
/* Compute and set the new count (relative to the old one) */
4854
cnt-=semun.array[i];
4955
if (cnt>0)
50-
acquire_sem_etc(Address[i+1],cnt,0,0);
56+
while(acquire_sem_etc(Address[i+1],cnt,0,0)==B_INTERRUPTED);
5157
if (cnt<0)
5258
release_sem_etc(Address[i+1],-cnt,0);
5359
}
5460
return1;
5561
}
5662

57-
/*si flag = SET_VAL il faut définir la valeur du sémaphore sursemun.val*/
63+
/*Fix the count of one semaphore tosemun.val*/
5864
if (flag==SETVAL)
5965
{
6066
int32cnt;
67+
/* Get the current count */
6168
get_sem_count(Address[semNum+1],&cnt);
62-
//printf("semctl set val id : %d val : %d = %d\n",semId,semun.val,cnt);
69+
70+
/* Compute and set the new count (relative to the old one) */
6371
cnt-=semun.val;
6472
if (cnt>0)
65-
acquire_sem_etc(Address[semNum+1],cnt,0,0);
73+
while(acquire_sem_etc(Address[semNum+1],cnt,0,0)==B_INTERRUPTED);
6674
if (cnt<0)
6775
release_sem_etc(Address[semNum+1],-cnt,0);
6876
return1;
6977
}
7078

71-
/*si flag=rm_id il faut supprimer le sémaphore*/
79+
/*Delete the pool*/
7280
if (flag==IPC_RMID)
7381
{
7482
longi;
75-
// Suppression des sémaphores (ils appartienent au kernel maintenant)
83+
7684
thread_infoti;
77-
//printf("remove set\n");
7885
get_thread_info(find_thread(NULL),&ti);
86+
87+
/* Loop over all semaphore to delete them */
7988
for (i=0;i<Address[0];i++)
8089
{
90+
/* Don't remember why I do that */
8191
set_sem_owner(Address[i+1],ti.team);
92+
93+
/* Delete the semaphore */
8294
delete_sem(Address[i+1]);
95+
96+
/* Reset to an invalid semId (in case other process try to get the infos from a cloned area */
97+
Address[i+1]=0;
8398
}
84-
// Il faudrait supprimer en boucle toutes les area portant le même nom
99+
100+
/* Set the semaphore count to 0 */
101+
Address[0]=0;
102+
103+
/* Delete the area (it might be cloned by other process. Let them live with it,
104+
in all cases semIds are 0 so if another process try to use it, it will fail */
85105
delete_area(semId);
106+
86107
return1;
87108
}
88109

89-
/*si flag = GETNCNT il faut renvoyer lesemaphore count*/
110+
/*Get the currentsemaphore count*/
90111
if (flag==GETNCNT)
91112
{
92-
//printf("getncnt : impossible sur BeOS\n");
93-
return0;// a faire (peut etre impossible sur Beos)
113+
/* TO BE IMPLEMENTED */
114+
elog(ERROR,"beos : semctl error : GETNCNT not implemented");
115+
return0;
94116
}
95117

96-
/*si flag = GETVAL il faut renvoyer la valeur du sémaphore*/
118+
/*Get the current semaphore count of the first semaphore in the pool*/
97119
if (flag==GETVAL)
98120
{
99121
int32cnt;
100122
get_sem_count(Address[semNum+1],&cnt);
101-
//printf("semctl getval id : %d cnt : %d\n",semId,cnt);
102123
returncnt;
103124
}
104-
//printf("semctl erreur\n");
125+
126+
elog(ERROR,"beos : semctl error : unknown flag");
127+
105128
return0;
106129
}
107130

108-
// L'area dans laquelle est stockée lepoolest identifiée par son nom (convention à moi : SYSV_IPC_SEM : "semId)
131+
/* Find apoolid based on IPC key */
109132
intsemget(intsemKey,intsemNum,intflags)
110133
{
111134
charNom[50];
112135
area_idparea;
113136
void*Address;
114137

115-
//printf("semget get k: %d n: %d fl:%d\n",semKey,semNum,flags);
116-
// Construction du nom que doit avoir l'area
138+
/* Name of the area to find */
117139
sprintf(Nom,"SYSV_IPC_SEM : %d",semKey);
118140

119-
// Recherche de l'area
141+
/* findarea */
120142
parea=find_area(Nom);
121143

122-
// L'areaexiste
144+
/* Test ofareaexistance */
123145
if (parea!=B_NAME_NOT_FOUND)
124146
{
125-
//printf("area found\n");
126-
// On demande une creatrion d'un pool existant : erreur
147+
/* Area exist and creation is requested, error */
127148
if ((flags&IPC_CREAT)&&(flags&IPC_EXCL))
128149
{
129-
//printf("creat asking exist\n");
130150
errno=EEXIST;
131151
return-1;
132152
}
133153

134-
// Clone de l'area et renvoi de son ID
154+
/* Get an area clone (in case it's not in our address space) */
155+
/* TODO : a check of address space might be done to avoid duplicate areas in the same address space*/
135156
parea=clone_area(Nom,&Address,B_ANY_ADDRESS,B_READ_AREA |B_WRITE_AREA,parea);
136157
returnparea;
137158
}
138-
// L'area n'existe pas
139159
else
140160
{
141-
//printf("set don't exist\n");
142-
// Demande de creation
161+
/* Area does not exist, but creation is requested, so create it */
143162
if (flags&IPC_CREAT)
144163
{
145164
int32*Address;
146-
thread_infoti;
147165
void*Ad;
148166
longi;
149167

150-
//printf("create set\n");
151-
// On ne peut pas creer plus de 500 semaphores dans un pool (limite tout à fait arbitraire de ma part)
168+
/* Limit to 500 semaphore in a pool */
152169
if (semNum>500)
153170
{
154171
errno=ENOSPC;
155172
return-1;
156173
}
157-
158-
// Creation de la zone de mémoire partagée
174+
175+
/* Create the shared memory area which will hold the pool */
159176
parea=create_area(Nom,&Ad,B_ANY_ADDRESS,4096,B_NO_LOCK,B_READ_AREA |B_WRITE_AREA);
160177
if ((parea==B_BAD_VALUE)|| (parea==B_NO_MEMORY)||(parea==B_ERROR))
161178
{
162179
errno=ENOMEM;
163180
return-1;
164181
}
182+
183+
/* fill up informations (sem number and sem ids) */
165184
Address=(int32*)Ad;
166185
Address[0]=semNum;
167186
for (i=1;i<=Address[0];i++)
168187
{
169-
// Creation des sémaphores 1 par 1
188+
/* Create the semaphores */
170189
Address[i]=create_sem(0,Nom);
171190

172191
if ((Address[i]==B_BAD_VALUE)|| (Address[i]==B_NO_MEMORY)||(Address[i]==B_NO_MORE_SEMS))
@@ -176,44 +195,43 @@ int semget(int semKey, int semNum, int flags)
176195
}
177196
}
178197

179-
//printf("returned %d\n",parea);
180198
returnparea;
181199
}
182-
// Le pool n'existe pas et pas de demande de création
183200
else
184201
{
185-
//printf("setdoes not exist nocreatrequested\n");
202+
/* Areadoes not existandnocreation isrequested */
186203
errno=ENOENT;
187204
return-1;
188205
}
189206
}
190207
}
191208

192-
// Opération sur le pool de sémaphores
209+
/* Acquire or release in the semaphore pool */
193210
intsemop(intsemId,structsembuf*sops,intnsops)
194211
{
195-
// Recherche de l'adresse du pool
196-
int32*Address;
212+
int32*Address;/*Pool address*/
197213
area_infoinfo;
198214
longi;
199215

200-
//printf("semop id : %d n: %d\n",semId,sops->sem_op);
216+
/* Get the pool address (semId IS an area id) */
201217
get_area_info(semId,&info);
202218
Address=(int32*)info.address;
219+
220+
/* Check the validity of semId (it should be an area id) */
203221
if ((semId==B_BAD_VALUE)||(semId==B_NO_MEMORY)||(semId==B_ERROR))
204222
{
205223
errno=EINVAL;
206224
return-1;
207225
}
208226

209-
// Execution de l'action
227+
/* Perform acquire or release */
210228
for(i=0;i<nsops;i++)
211229
{
212-
213-
//printf("semid %d, n %d\n",Address[sops[i].sem_num+1],sops[i].sem_op);
230+
/* For each sem in the pool, check the operation to perform */
214231
if (sops[i].sem_op<0)
215232
{
216-
acquire_sem_etc(Address[sops[i].sem_num+1],-sops[i].sem_op,0,0);
233+
/* Try acuiring the semaphore till we are not inteerupted by a signal */
234+
while (acquire_sem_etc(Address[sops[i].sem_num+1],-sops[i].sem_op,0,0)==B_INTERRUPTED);
217235
}
218236
if (sops[i].sem_op>0)
219237
{

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