5
/* $Id: shmem.c,v 1.87.2.2 2007-09-10 23:31:32 manoj Exp $ */
6
/* System V shared memory allocation and managment
10
* char *Create_Shared_Region(long *idlist, long size, long *offset)
11
* . to be called by just one process.
12
* . calls kr_malloc, malloc-like memory allocator from the K&R book.
13
* kr_malloc inturn calls armci_allocate() that does shmget() and shmat().
14
* . idlist might be just a pointer to integer or a true array in the
15
* MULTIPLE_REGIONS versions (calling routine has to take care of it)
16
* char *Attach_Shared_Region(long *idlist, long size, long offset)
17
* . called by any other process to attach to existing shmem region or
18
* if attached just calculate the address based on the offset
19
* . has to be called after shmem region was created
20
* void Free_Shmem_Ptr(long id, long size, char* addr)
21
* . called ONLY by the process that created shmem region (id) to return
22
* pointer to kr_malloc (shmem is not destroyed)
23
* void Delete_All_Regions()
24
* . destroys all shared memory regions
25
* . can be called by any process assuming that all processes attached
26
* to alllocated shmem regions
27
* . needs to by called by cleanup procedure(s)
29
* Jarek Nieplocha, 06.13.94
40
/* For debugging purposes at the beginning of the shared memory region
41
* creator process can write a stamp which then is read by attaching processes
42
* NOTE: on clusters we cannot use it anymore since ARMCI node master
43
* uses it since Nov 99 to write the value of address it attached at
44
* This feature is used in the ARMCI memlock table.
49
#include <sys/types.h>
53
#include <sys/param.h>
58
#include "kr_malloc.h"
66
static size_t pagesize=0;
67
static int logpagesize=0;
68
/* allow only that big shared memory segment (in MB)- incresed from 128 11/02 */
69
#define MAX_ALLOC_MUNMAP 128
70
#define MAX_ALLOC_MUNMAP_ 368
71
static long max_alloc_munmap=MAX_ALLOC_MUNMAP;
78
#define SHM_UNIT (1024)
81
/* Need to determine the max shmem segment size. There are 2 alternatives:
82
* 1. use predefined SHMMAX if available or set some reasonable values, or
83
* 2. trial-and-error search for a max value (default)
84
* case a) fork a process to determine shmmax size (more accurate)
85
* case b) search w/o forking until success (less accurate)
88
/* under Myrinet GM, we cannot fork */
89
#if defined(GM) || defined(VAPI)
90
# define SHMMAX_SEARCH_NO_FORK
92
#if defined(LAPI) || defined(AIX) || defined(SHMMAX_SEARCH_NO_FORK) || defined(CRAY_XT)
93
# define NO_SHMMAX_SEARCH
96
/* Limits for the largest shmem segment are in Kilobytes to avoid passing
97
* Gigavalues to kr_malloc
98
* the limit for the KSR is lower than SHMMAX in sys/param.h because
99
* shmat would fail -- SHMMAX cannot be trusted (a bug)
101
#define _SHMMAX 4*1024
103
#if defined(SUN)||defined(SOLARIS)
105
# define _SHMMAX (1024) /* memory in KB */
106
#elif defined(SGI64) || defined(AIX) || defined(CONVEX)
108
# define _SHMMAX ((unsigned long)512*1024)
109
#elif defined(SGI) && !defined(SGI64)
111
# define _SHMMAX ((unsigned long)128*1024)
114
# define _SHMMAX ((unsigned long)512*1024)
117
# define _SHMMAX ((unsigned long)64*1024)
118
#elif defined(__FreeBSD__)
120
# define _SHMMAX ((unsigned long)3*1024)
122
# if !defined(SHMMAX) /* Red Hat does not define SHMMAX */
124
# if defined(__sparc__) || defined(__powerpc__)
125
# define _SHMMAX ((unsigned long)16*1024)
126
# elif defined(__alpha__)
127
# define _SHMMAX ((unsigned long)4072)
130
# define _SHMMAX ((unsigned long)32*1024)
133
#elif defined(SHMMAX)
135
# define _SHMMAX (((unsigned long)SHMMAX)>>10)
138
static unsigned long MinShmem = _SHMMAX;
139
static unsigned long MaxShmem = MAX_REGIONS*_SHMMAX;
140
static context_t ctx_shmem; /* kr_malloc context */
141
static context_t *ctx_shmem_global; /* kr_malloc context stored in shmem */
142
static int create_call=0;
144
#ifdef SHMMAX_SEARCH_NO_FORK
145
static char *ptr_search_no_fork = (char*)0;
146
static int id_search_no_fork=0;
151
#define CLEANUP_CMD(command) sprintf(command,"/usr/bin/ipcrm shm %d",id);
152
#elif defined(SOLARIS)
153
#define CLEANUP_CMD(command) sprintf(command,"/bin/ipcrm -m %d",id);
155
#define CLEANUP_CMD(command) sprintf(command,"/usr/sbin/ipcrm -m %d",id);
157
#define CLEANUP_CMD(command) sprintf(command,"/usr/bin/ipcrm -m %d",id);
163
# include <elan/elan.h>
164
# include <elan3/elan3.h>
165
static char *armci_elan_starting_address = (char*)0;
168
# define ALLOC_MUNMAP_ALIGN 1024*1024
170
# define ALLOC_MUNMAP_ALIGN 64*1024
173
# define ALGN_MALLOC(s,a) elan_allocMain(elan_base->state, (a), (s))
175
# define ALGN_MALLOC(s,a) malloc((s))
178
static char* alloc_munmap(size_t size)
182
size_t bytes = size+pagesize-1;
184
if(armci_elan_starting_address){
185
tmp = armci_elan_starting_address;
186
armci_elan_starting_address += size;
187
# ifdef ALLOC_MUNMAP_ALIGN
188
armci_elan_starting_address += ALLOC_MUNMAP_ALIGN;
190
if(DEBUG_) {printf("%d: address for shm attachment is %p size=%ld\n",
191
armci_me,tmp,(long)size); fflush(stdout); }
193
tmp = ALGN_MALLOC(bytes, getpagesize());
195
iptr = (unsigned long)tmp + pagesize-1;
196
iptr >>= logpagesize; iptr <<= logpagesize;
197
if(DEBUG_) printf("%d:unmap ptr=%p->%p size=%d pagesize=%d\n",armci_me,
198
tmp,(char*)iptr,(int)size,pagesize);
200
if(munmap(tmp, size) == -1) armci_die("munmap failed",0);
201
if(DEBUG_){printf("%d: unmap OK\n",armci_me); fflush(stdout);}
202
}else armci_die("alloc_munmap: malloc failed",(int)size);
208
/*\ A wrapper to shmget. Just to be sure that ID is not 0.
210
int armci_shmget(size_t size,char *from)
214
id = shmget(IPC_PRIVATE, size, (IPC_CREAT | 00600));
216
/*attaching with id 0 somehow fails (Seen on pentium4+linux24+gm163)
217
*so if id=0, shmget again. */
219
/* free id=0 and get a new one */
220
if(shmctl((int)id,IPC_RMID,(struct shmid_ds *)NULL)) {
221
fprintf(stderr,"id=%d \n",id);
222
armci_die("allocate: failed to _delete_ shared region ",id);
224
id = shmget(IPC_PRIVATE, size, (IPC_CREAT | 00600));
227
printf("\n%d:armci_shmget sz=%ld caller=%s id=%d\n",armci_me,(long)size,
235
Semget(key_t key,int nsems,int semflg) {
238
if((ret = semget(key,nsems,semflg)) == -1) {
240
case EACCES: fprintf(stdout," semget errno=EACCES.\n"); break;
241
case EINVAL: fprintf(stdout," semget errno=EINVAL.\n"); break;
242
case ENOENT: fprintf(stdout," semget errno=ENOENT.\n"); break;
243
case ENOSPC: fprintf(stdout," semget errno=ENOSPC -- check system limit for sysv semaphores.\n"); break;
244
case ENOMEM: fprintf(stdout," semget errno=ENOMEM.\n"); break;
245
case EEXIST: fprintf(stdout," semget errno=EEXIST.\n"); break;
247
fprintf(stdout," unusual semget errno=%d\n",errno); break;
249
armci_die("semget failed",errno);
256
int armci_semget(int count)
259
id = Semget(IPC_PRIVATE,2,0600);
263
int armci_semrm(int id)
265
semctl(id,0,IPC_RMID);
268
int armci_shmrm(int id)
271
if((ret = shmctl(id,IPC_RMID,NULL)) != 0) {
272
fprintf(stdout,"[cp]: shmctl return an error.\n");
275
fprintf(stdout," Error EINVAL: shmid is not a valid shared memory segment.\n");
278
fprintf(stdout," Error EFAULT: argument 3 is not a valid struct shmid_ds.\n");
281
fprintf(stdout," Error EPREM: permission to access/change shared mem segment denied.\n");
284
fprintf(stdout," unusual shmctl errno=%d\n",errno); break;
287
armci_die("error deleting shmid",id);
292
/*\ test is a shared memory region of a specified size can be allocated
293
* return 0 (no) or 1 (yes)
295
int armci_test_allocate(long size)
298
int id = armci_shmget((size_t)size,"armci_test_allocate");
301
/* attach to segment */
302
ptr = shmat(id, (char *) NULL, 0);
304
/* delete segment id */
305
if(shmctl( id, IPC_RMID, (struct shmid_ds *)NULL))
306
fprintf(stderr,"failed to remove shm id=%d\n",id);
309
if (((long)ptr) == -1L) return 0;
314
/*\ try to allocate a shared memory region of a specified size; return pointer
316
static int armci_shmalloc_try(long size)
318
#ifdef SHMMAX_SEARCH_NO_FORK
320
int id = armci_shmget((size_t) size,"armci_shmalloc_try");
323
/* attach to segment */
324
ptr = shmat(id, (char *) NULL, 0);
327
if (((long)ptr) == -1L) return 0;
329
ptr_search_no_fork = ptr;
330
id_search_no_fork = id;
338
/* parameters that define range and granularity of search for shm segment size
339
* UBOUND is chosen to be < 2GB to avoid overflowing on 32-bit systems
340
* smaller PAGE gives more accurate results but with more search steps
341
* LBOUND is set to minimum amount for our purposes
342
* change UBOUND=512MB if you need larger arrays than 512 MB
344
#define PAGE (16*65536L)
345
#define LBOUND 1048576L
346
#if defined(MULTI_CTX) && defined(QUADRICS)
347
#define UBOUND 256*LBOUND
349
#define UBOUND 512*LBOUND
352
static long get_user_shmmax()
356
uval = getenv("ARMCI_DEFAULT_SHMMAX");
358
sscanf(uval,"%ld",&x);
359
if(x<1L || x> 2048L){
360
fprintf(stderr,"incorrect ARMCI_DEFAULT_SHMMAX should be <1,2048>mb and 2^N Found=%ld\n",x);
364
return x*1048576; /* return value in bytes */
367
/*\ determine the max shmem segment size using bisection
369
int armci_shmem_test()
373
long upper_bound=UBOUND;
376
x = get_user_shmmax();
377
if(!x) x = upper_bound;
380
if(DEBUG_){printf("%d: x = %ld upper_bound=%ld\n",armci_me, x, upper_bound); fflush(stdout);}
384
rc = armci_test_allocate(x);
386
printf("%d:test %d size=%ld bytes status=%d\n",armci_me,i,x,rc);
389
step = (upper_bound -x)>>1;
390
if(step < PAGE) break;
394
step = (x-lower_bound)>>1;
398
/* round it up to a full base-2 MB */
405
/* try if can get LBOUND - necessary if search starts from UBOUND */
407
rc = armci_test_allocate(lower_bound);
411
if(DEBUG_) printf("%ld bytes segment size, %d calls \n",lower_bound,i);
412
return (int)( lower_bound>>20); /* return shmmax in mb */
416
#ifdef SHMMAX_SEARCH_NO_FORK
417
/*\ determine the max shmem segment size by halving
419
static int armci_shmem_test_no_fork()
423
long lower_bound=_SHMMAX*SHM_UNIT;
424
#define UBOUND_SEARCH_NO_FORK (256*SHM_UNIT*SHM_UNIT)
426
x = get_user_shmmax();
427
if(!x) x = UBOUND_SEARCH_NO_FORK;
431
rc = armci_shmalloc_try(x);
433
printf("%d:test by halving size=%ld bytes rc=%d\n",armci_me,x,rc);
440
if(x<lower_bound) break;
444
if(DEBUG_) printf("%ld: shmax test no fork: bytes segment size, %d calls \n",lower_bound,i);
445
return (int)( lower_bound>>20); /* return shmmax in mb */
451
void armci_nattach_preallocate_info(int* segments, int *segsize)
455
uval = getenv("LIBELAN_NATTACH");
457
sscanf(uval,"%d",&x);
458
if(x<2 || x>8) armci_die("Error in LIBELAN_NATTACH <8, >1 ",(int)x);
460
armci_die("Inconsistent configuration: ARMCI needs LIBELAN_NATTACH",0);
462
*segsize = (int) (SHM_UNIT * MinShmem);
467
/* Create shared region to store kr_malloc context in shared memory */
468
void armci_krmalloc_init_ctxshmem() {
470
long idlist[SHMIDLEN];
472
int offset = sizeof(void*)/sizeof(int);
474
/* to store shared memory context and myptr */
475
size = SHMEM_CTX_MEM;
477
if(armci_me == armci_master ){
478
myptr = Create_Shared_Region(idlist+1,size,idlist);
479
if(!myptr && size>0 ) armci_die("armci_krmalloc_init_ctxshmem: could not create", (int)(size>>10));
480
if(size) *(volatile void**)myptr = myptr;
482
printf("%d:armci_krmalloc_init_ctxshmem addr mptr=%p ref=%p size=%ld\n", armci_me, myptr, *(void**)myptr, size);
486
/* Bootstrapping: allocate storage for ctx_shmem_global. NOTE:there is
487
offset,as master places its address at begining for others to see */
488
ctx_shmem_global = (context_t*) ( ((int*)myptr)+offset );
489
*ctx_shmem_global = ctx_shmem; /*master copies ctx into shared region */
492
/* broadcast shmem id to other processes on the same cluster node */
493
armci_msg_clus_brdcst(idlist, SHMIDLEN*sizeof(long));
495
if(armci_me != armci_master){
496
myptr=(double*)Attach_Shared_Region(idlist+1,size,idlist[0]);
497
if(!myptr)armci_die("armci_krmalloc_init_ctxshmem: could not attach", (int)(size>>10));
499
/* now every process in a SMP node needs to find out its offset
500
* w.r.t. master - this offset is necessary to use memlock table
502
if(size) armci_set_mem_offset(myptr);
504
printf("%d:armci_krmalloc_init_ctxshmem attached addr mptr=%p ref=%p size=%ld\n", armci_me,myptr, *(void**)myptr,size); fflush(stdout);
506
/* store context info */
507
ctx_shmem_global = (context_t*) ( ((int*)myptr)+offset );
509
printf("%d:armci_krmalloc_init_ctxshmem: shmid=%d off=%ld size=%ld\n", armci_me, ctx_shmem_global->shmid, ctx_shmem_global->shmoffset,
510
(long)ctx_shmem_global->shmsize);
516
void armci_shmem_init()
521
#if defined(QUADRICS)
522
# if (defined(__ia64__) || defined(__alpha)) && !defined(DECOSF)
524
/* this is to determine size of Elan Main memory allocator for munmap */
527
uval = getenv("LIBELAN_ALLOC_SIZE");
529
sscanf(uval,"%ld",&x);
530
if((x>80000000) && (x< 4*1024*1024*1024L)){
531
max_alloc_munmap = (x>>20) - 72;
533
printf("%d: max_alloc_munmap is %ld\n",armci_me,max_alloc_munmap);
539
/* an alternative approach is to use MMAP area where we get
540
the address from the Elan environment variable in qsnetlibs 1.4+ */
541
uval = getenv("LIBELAN3_MMAPBASE");
543
sscanf(uval,"%p",&armci_elan_starting_address);
547
# if defined(__ia64__)
548
/* need aligment on 1MB boundary rather than the actual pagesize */
549
pagesize = 1024*1024;
552
/* determine log2(pagesize) needed for address alignment */
555
pagesize = getpagesize();
556
if(tp>pagesize)armci_die("armci_shmem_init:pagesize",pagesize);
562
if(tp!=pagesize)armci_die("armci_shmem_init:pagesize pow 2",pagesize);
566
printf("page size =%d log=%d\n",pagesize,logpagesize); fflush(stdout); }
571
if(armci_me == armci_master){
572
#if !defined(NO_SHMMAX_SEARCH) || defined(SHMMAX_SEARCH_NO_FORK)
573
# ifdef SHMMAX_SEARCH_NO_FORK
574
int x = armci_shmem_test_no_fork();
576
int x = armci_child_shmem_init();
580
armci_die("no usable amount of shared memory available: only got \n",
583
# if defined(ALLOC_MUNMAP)
584
/* cap down for special memory allocator unless ARMCI_DEFAULT_SHMMAX
585
not set - the user knows what is doing*/
586
# if !defined(REGION_ALLOC)
587
if(!getenv("ARMCI_DEFAULT_SHMMAX"))
588
if(x>max_alloc_munmap && !armci_elan_starting_address) x=max_alloc_munmap;
595
printf("%d:shmem_init: %d mbytes max segment size\n",armci_me,x);fflush(stdout);}
597
MinShmem = (long)(x<<10); /* make sure it is in kb: mb <<10 */
598
MaxShmem = MAX_REGIONS*MinShmem;
599
# ifdef REPORT_SHMMAX
600
printf("%d using x=%d SHMMAX=%ldKB\n", armci_me,x, MinShmem);
605
/* nothing to do here - limits were given */
610
armci_krmalloc_init_ctxshmem();
611
if(DEBUG_)printf("%d: out of shmem_init\n",armci_me);
615
/*\ application can reset the upper limit (bytes) for memory allocation
617
void armci_set_shmem_limit(unsigned long shmemlimit)
619
unsigned long kbytes;
620
kbytes = (shmemlimit + SHM_UNIT -1)/SHM_UNIT;
621
if(MaxShmem > kbytes) MaxShmem = kbytes;
622
if(MinShmem > kbytes) MinShmem = kbytes;
626
static void shmem_errmsg(size_t size)
629
printf("******************* ARMCI INFO ************************\n");
630
printf("The application attempted to allocate a shared memory segment ");
631
printf("of %ld bytes in size. This might be in addition to segments ",sz);
632
printf("that were allocated succesfully previously. ");
633
printf("The current system configuration does not allow enough ");
634
printf("shared memory to be allocated to the application.\n");
635
printf("This is most often caused by:\n1) system parameter SHMMAX ");
636
printf("(largest shared memory segment) being too small or\n");
637
printf("2) insufficient swap space.\n");
638
printf("Please ask your system administrator to verify if SHMMAX ");
639
printf("matches the amount of memory needed by your application and ");
640
printf("the system has sufficient amount of swap space. ");
641
printf("Most UNIX systems can be easily reconfigured ");
642
printf("to allow larger shared memory segments,\n");
643
printf("see http://www.emsl.pnl.gov/docs/global/support.html\n");
644
printf("In some cases, the problem might be caused by insufficient swap space.\n");
645
printf("*******************************************************\n");
649
static struct shm_region_list{
654
}region_list[MAX_REGIONS];
655
static int alloc_regions=0;
656
static long occup_blocks=0;
659
* region - actual piece of shared memory allocated from OS
660
* block - a part of allocated shmem that is given to the requesting process
664
static int last_allocated=-1;
667
unsigned long armci_max_region()
673
int find_regions(char *addrp, long* id, int *region)
677
if(last_allocated!=-1){
682
for(reg=-1,nreg=0;nreg<alloc_regions; nreg++)
684
if(addrp >= region_list[nreg].addr &&
685
addrp < (region_list[nreg].addr + region_list[nreg].sz))
693
armci_die("find_regions: failed to locate shared region", 0L);
697
*id = region_list[reg].id;
702
/* returns the shmem info based on the addr */
703
int armci_get_shmem_info(char *addrp, int* shmid, long *shmoffset,
708
find_regions(addrp, &id, ®ion);
710
*shmoffset = (long)(addrp - region_list[region].addr);
711
*shmsize = region_list[region].sz;
716
long armci_shm_reg_size(int i, long id)
718
if(i<0 || i>= MAX_REGIONS)armci_die("armci_shmem_reg_size: bad i",i);
719
return region_list[i].sz;
722
void* armci_shm_reg_ptr(int i)
724
if(i<0 || i>= MAX_REGIONS)armci_die("armci_shmem_reg_ptr: bad i",i);
725
return (void *)region_list[i].addr;
728
Header *armci_get_shmem_ptr(int shmid, long shmoffset, size_t shmsize)
730
/* returns, address of the shared memory region based on shmid, offset.
731
* (i.e. return_addr = stating address of shmid + offset)*/
732
long idlist[SHMIDLEN];
735
idlist[1] = (long)shmid;
736
idlist[0] = shmoffset;
737
idlist[IDLOC+1] = shmsize; /* CHECK : idlist in CreateShmem????*/
739
if(!(p=(Header*)Attach_Shared_Region(idlist+1, shmsize, idlist[0])))
740
armci_die("kr_malloc:could not attach",(int)(p->s.shmsize>>10));
742
printf("%d: armci_get_shmem_ptr: %d %ld %ld %p\n",
743
armci_me, idlist[1], idlist[0], shmsize, p);
750
char *Attach_Shared_Region(id, size, offset)
751
long *id, offset, size;
753
int reg, found, shmflag=0;
756
if(alloc_regions>=MAX_REGIONS)
757
armci_die("Attach_Shared_Region: to many regions ",0);
760
printf("%d:AttachSharedRegion %d:size=%ld id=%ld\n",
761
armci_me, create_call++, size,*id);
766
/* under Linux we can get valid id=0 */
768
if(!*id) armci_die("Attach_Shared_Region: shmem ID=0 ",(int)*id);
771
/* first time needs to initialize region_list structure */
773
for(reg=0;reg<MAX_REGIONS;reg++){
774
region_list[reg].addr=(char*)0;
775
region_list[reg].attached=0;
776
region_list[reg].id=0;
778
MinShmem= id[SHMIDLEN-2];
780
printf("%d:attach: allocation unit: %ldK\n",armci_me,MinShmem);
785
/* search region_list for the current shmem id */
786
for(found = 0, reg=0; reg < MAX_REGIONS;reg++)
787
if((found=(region_list[reg].id == *id)))break;
791
region_list[reg].id =*id;
795
/* we need to use the actual shared memory segment not user req size */
798
/* attach if not attached yet */
799
if(!region_list[reg].attached){
802
char *pref_addr = alloc_munmap((size_t) (size));
804
char *pref_addr = (char*)0;
806
if ( (long) (temp = shmat((int) *id, pref_addr, shmflag)) == -1L){
807
fprintf(stderr,"%d:attach error:id=%ld off=%ld seg=%ld\n",armci_me,*id,offset,MinShmem);
808
shmem_errmsg((size_t)MinShmem*1024);
809
armci_die("Attach_Shared_Region:failed to attach to segment id=",(int)*id);
812
printf("%d:attached: id=%d address=%p\n",armci_me,(int)*id, temp);
815
POST_ALLOC_CHECK(temp,size);
816
region_list[reg].addr = temp;
817
region_list[reg].attached = 1;
818
region_list[reg].sz= size;
820
printf("\n%d:%s:new memory region\n",armci_me,__FUNCTION__);fflush(stdout);
826
/* check stamp to make sure that we are attached in the right place */
827
if(*((int*)(region_list[reg].addr+ offset))!= alloc_regions-1)
828
armci_die("Attach_Shared_Region: wrong stamp value !",
829
*((int*)(region_list[reg].addr+ offset)));
831
return (region_list[reg].addr+ offset);
835
extern void armci_region_register_shm(void *start, long size);
838
/*\ allocates shmem, to be called by krmalloc that is called by process that
839
* creates shmem region
841
void *armci_allocate(long size)
845
size_t sz = (size_t)size;
847
char *pref_addr = alloc_munmap((size_t) (MinShmem*SHM_UNIT));
849
char *pref_addr = (char*)0;
851
#if defined(SGI_N32) && defined(SHM_SGI_ANYADDR)
852
shmflag= SHM_SGI_ANYADDR;
856
printf("%d:allocate: Shmem allocate size %ld bytes\n",armci_me,size);
860
if( alloc_regions >= MAX_REGIONS)
861
armci_die("Create_Shared_Region:allocate:too many regions allocated ",0);
863
last_allocated = alloc_regions;
865
#ifdef SHMMAX_SEARCH_NO_FORK
866
if (ptr_search_no_fork){
867
temp = ptr_search_no_fork;
868
id = id_search_no_fork;
869
ptr_search_no_fork = (char*)0; /* do not look at it again */
873
if ( (id = armci_shmget(sz,"armci_allocate")) < 0 ) {
874
fprintf(stderr,"id=%d size=%ld\n",id, size);
876
armci_die("allocate: failed to create shared region ",id);
879
if ( (long)( (temp = shmat(id, pref_addr, shmflag))) == -1L){
881
CLEANUP_CMD(command);
882
if(system(command) == -1)
883
printf("Please clean shared memory (id=%d): see man ipcrm\n",id);
884
armci_die("allocate: failed to attach to shared region id=",id);
887
printf("%d:allocate:attach:id=%d paddr=%p size=%ld\n",armci_me,id,temp,size);
891
/* delete segment id so that OS cleans it when all attached processes are gone */
892
if(shmctl( id, IPC_RMID, (struct shmid_ds *)NULL))
893
fprintf(stderr,"failed to remove shm id=%d\n",id);
897
POST_ALLOC_CHECK(temp,sz);
899
region_list[alloc_regions].addr = temp;
900
region_list[alloc_regions].id = id;
901
region_list[alloc_regions].attached=1;
902
region_list[alloc_regions].sz=sz;
906
printf("%d:allocate:id=%d addr=%p size=%ld\n",armci_me,id,temp,size);
910
return (void*) (temp);
913
/******************** common code for the two versions *********************/
916
/*\ Allocate a block of shared memory - called by master process
918
char *Create_Shared_Region(long *id, long size, long *offset)
921
int reg, refreg=0,nreg;
923
if(alloc_regions>=MAX_REGIONS)
924
armci_die("Create_Shared_Region: to many regions ",0);
927
printf("%d:CreateSharedRegion %d:size=%ld\n",armci_me,create_call++,size);
931
/*initialization: 1st allocation request */
933
for(reg=0;reg<MAX_REGIONS;reg++){
934
region_list[reg].addr=(char*)0;
935
region_list[reg].attached=0;
936
region_list[reg].id=0;
939
printf("%d:1st CreateSharedRegion: allocation unit:%ldK,shmax:%ldK\n",
940
armci_me,MinShmem,MaxShmem);
944
kr_malloc_init(SHM_UNIT, (size_t)MinShmem, (size_t)MaxShmem,
945
armci_allocate, 0, &ctx_shmem);
946
ctx_shmem.ctx_type = KR_CTX_SHMEM;
947
id[SHMIDLEN-2]=MinShmem;
950
if(!alloc_regions) temp = kr_malloc((size_t)size, &ctx_shmem,0, NULL, NULL);
951
else temp = kr_malloc((size_t)size, ctx_shmem_global,0,NULL,NULL);
953
if(temp == (char*)0 )
954
armci_die("CreateSharedRegion:kr_malloc failed KB=",(int)size>>10);
956
if(!(nreg=find_regions(temp,id,®)))
957
armci_die("CreateSharedRegion: allocation inconsitent",0);
959
#ifndef MULTIPLE_REGIONS
963
if(STAMP) *((int*)temp) = alloc_regions-1;
964
*offset = (long) (temp - region_list[refreg].addr);
965
id[IDLOC]=region_list[reg].sz; /* elan post check */
969
printf("%d:CreateShmReg:reg=%d id=%ld off=%ld ptr=%p adr=%p s=%d n=%d sz=%ld\n",
970
armci_me,reg,region_list[reg].id,*offset,region_list[reg].addr,
971
temp,(int)size,nreg,id[IDLOC]);
980
/*\ only process that created shared region returns the pointer to kr_malloc
982
void Free_Shmem_Ptr( id, size, addr)
986
kr_free(addr, ctx_shmem_global);
990
void Delete_All_Regions()
996
for(reg = 0; reg < MAX_REGIONS; reg++){
997
if(region_list[reg].addr != (char*)0){
998
code += shmctl((int)region_list[reg].id,IPC_RMID,(struct shmid_ds *)NULL);
999
region_list[reg].addr = (char*)0;
1000
region_list[reg].attached = 0;
1002
fprintf(stderr,"%d Delete_All_Regions id=%d code=%d\n",armci_me,
1003
(int)region_list[reg].id, code);
1010
Semop(int semid,struct sembuf *opers,size_t nops) {
1013
if((ret = semop(semid,opers,nops)) == -1) {
1014
printf("%d: semop error performing %i operation(s) on semid %i.\n",armci_me,(int) nops,semid);
1016
case EFBIG: printf(" semop errno=EFBIG.\n"); break;
1017
case E2BIG: printf(" semop errno=E2BIG.\n"); break;
1018
case EINTR: printf(" semop errno=EINTR.\n"); break;
1019
case EINVAL: printf(" semop errno=EINVAL.\n"); break;
1020
case EACCES: printf(" semop errno=EACCES.\n"); break;
1021
case EAGAIN: printf(" semop errno=EAGAIN.\n"); break;
1022
case ENOSPC: printf(" semop errno=ENOSPC.\n"); break;
1023
case ERANGE: printf(" semop errno=ERANGE.\n"); break;
1024
case EFAULT: printf(" semop errno=EFAULT.\n"); break;
1026
printf(" unusual semop errno=%d\n",errno); break;
1028
armci_die("semaphore error",911);
1036
semaphoreOperation(int semid,int semnum,int semop) {
1039
op.sem_num = semnum;
1041
return Semop(semid,&op,1);
1046
semaphoreAcquire(int semid, int semnum,int access) {
1048
op.sem_op = -access;
1049
op.sem_num = semnum;
1056
semaphoreRelease(int semid,int semnum,int access) {
1059
op.sem_num = semnum;
1065
what are doing here ?