Line data Source code
1 : #if FD_HAS_HOSTED
2 : #define _GNU_SOURCE
3 : #endif
4 :
5 : #include "fd_shmem_private.h"
6 :
7 : #if FD_HAS_HOSTED
8 :
9 : #include <errno.h>
10 : #include <unistd.h>
11 : #include <fcntl.h>
12 : #include <sys/mman.h>
13 : #include <sys/random.h>
14 :
15 : /* fd_shmem_private_key converts the cstr pointed to by name into a
16 : valid key and stores it at the location pointed to by key assumed
17 : valid). Returns key on success and NULL on failure (i.e. name does
18 : not point to a valid shmem region name). All bytes of key will be
19 : unambiguously initialized so there is no issue with using things like
20 : memcmp to compare keys, etc. */
21 :
22 : static inline fd_shmem_private_key_t *
23 : fd_shmem_private_key( fd_shmem_private_key_t * key,
24 2577 : char const * name ) {
25 2577 : ulong len = fd_shmem_name_len( name );
26 2577 : if( FD_UNLIKELY( !len ) ) return NULL;
27 2451 : fd_memset( key->cstr, 0, FD_SHMEM_NAME_MAX );
28 2451 : fd_memcpy( key->cstr, name, len );
29 2451 : return key;
30 2577 : }
31 :
32 : static fd_shmem_private_key_t const fd_shmem_private_key_null; /* Will be zeros at thread group start */
33 :
34 508842 : #define FD_SHMEM_PRIVATE_MAP_LG_SLOT_CNT (8)
35 502548 : #define FD_SHMEM_PRIVATE_MAP_SLOT_CNT (1UL<<FD_SHMEM_PRIVATE_MAP_LG_SLOT_CNT)
36 : FD_STATIC_ASSERT( FD_SHMEM_JOIN_MAX < FD_SHMEM_PRIVATE_MAP_SLOT_CNT, increase_lg_slot_count );
37 :
38 : #define MAP_NAME fd_shmem_private_map
39 4428 : #define MAP_T fd_shmem_join_info_t
40 6294 : #define MAP_LG_SLOT_CNT FD_SHMEM_PRIVATE_MAP_LG_SLOT_CNT
41 6294 : #define MAP_KEY_T fd_shmem_private_key_t
42 1866 : #define MAP_KEY_NULL fd_shmem_private_key_null
43 508647 : #define MAP_KEY_INVAL(k) (!((k).cstr[0]))
44 1641 : #define MAP_KEY_EQUAL(k0,k1) (!memcmp( (k0).cstr, (k1).cstr, FD_SHMEM_NAME_MAX ))
45 : #define MAP_KEY_EQUAL_IS_SLOW (1)
46 4428 : #define MAP_KEY_HASH(k) ((uint)fd_hash( 0UL, (k).cstr, FD_SHMEM_NAME_MAX ))
47 : #include "../tmpl/fd_map.c"
48 :
49 : /* fd_shmem_private_map_query_by_{join,addr} are some extra
50 : fd_shmem_private_map APIs allow looking up the join info for a region
51 : by its join handle and/or by a pointer at a byte in the region int
52 : the thread group's local address space. These aren't algorithmically
53 : efficient but aren't expected to be and are plenty fast in normal use
54 : anyway. */
55 :
56 : static inline fd_shmem_join_info_t *
57 : fd_shmem_private_map_query_by_join( fd_shmem_join_info_t * map,
58 : void const * join,
59 2373 : fd_shmem_join_info_t * def ) {
60 247113 : for( ulong slot_idx=0UL; slot_idx<FD_SHMEM_PRIVATE_MAP_SLOT_CNT; slot_idx++ )
61 247032 : if( ((!fd_shmem_private_map_key_inval( map[slot_idx].key )) & (map[slot_idx].join==join)) ) return &map[slot_idx];
62 81 : return def;
63 2373 : }
64 :
65 : static inline fd_shmem_join_info_t *
66 : fd_shmem_private_map_query_by_addr( fd_shmem_join_info_t * map,
67 : ulong a0,
68 : ulong a1, /* Assumes a1>=a0 */
69 1488 : fd_shmem_join_info_t * def ) {
70 255435 : for( ulong slot_idx=0UL; slot_idx<FD_SHMEM_PRIVATE_MAP_SLOT_CNT; slot_idx++ ) {
71 255321 : ulong j0 = (ulong)map[slot_idx].shmem;
72 255321 : ulong j1 = j0 + map[slot_idx].page_sz*map[slot_idx].page_cnt - 1UL;
73 255321 : if( ((!fd_shmem_private_map_key_inval( map[slot_idx].key )) & (a1>=j0) & (a0<=j1)) ) return &map[slot_idx];
74 255321 : }
75 114 : return def;
76 1488 : }
77 :
78 : /*
79 : * fd_shmem_private_grab_region will attempt to map a region at the passed
80 : * address with the passed size. If the return value of `mmap` equals the
81 : * passed address this means the area of memory was unmapped previously and
82 : * we have successfully "grabbed" the region. We can then call `mmap` with
83 : * MAP_FIXED over the region and be certain no corruption occurs. If the
84 : * return value of `mmap` does not return the passed address this means that
85 : * the passed region is already atleast partially mapped and we cannot grab it.
86 : */
87 : static void *
88 : fd_shmem_private_grab_region( ulong addr,
89 3716 : ulong size ) {
90 3716 : void * mmap_ret = mmap( (void*)addr, size, PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0 );
91 3716 : if( FD_UNLIKELY( mmap_ret == MAP_FAILED ) ) return mmap_ret;
92 :
93 3716 : if( FD_UNLIKELY( (ulong)mmap_ret != addr ) ) {
94 1820 : if( munmap( mmap_ret, size ) ) {
95 0 : FD_LOG_ERR(( "failed to unmap temporary mapping, munmap() failed (%i-%s)", errno, fd_io_strerror( errno ) ));
96 0 : }
97 1820 : return MAP_FAILED;
98 1820 : }
99 :
100 1896 : return mmap_ret;
101 3716 : }
102 :
103 : void *
104 : fd_shmem_private_map_rand( ulong size,
105 1896 : ulong align ) {
106 1896 : ulong ret_addr = 0;
107 :
108 : /* Failure is unlikely, 1000 iterations should guarantee success */
109 3716 : for( ulong i = 0; i < 1000; i++ ) {
110 3716 : long n = getrandom( &ret_addr, sizeof(ret_addr), 0 );
111 3716 : if( FD_UNLIKELY( n!=sizeof(ret_addr) ) ) FD_LOG_ERR(( "could not generate random address, getrandom() failed (%i-%s)", errno, fd_io_strerror( errno ) ));
112 :
113 : /* Assume 48-bit virtual addressing */
114 3716 : ret_addr &= 0x0000FFFFFFFFFFFFUL;
115 3716 : ret_addr = fd_ulong_align_up( ret_addr, align );
116 :
117 3716 : if( fd_shmem_private_grab_region( ret_addr, size )!=MAP_FAILED ) {
118 1896 : return (void *)ret_addr;
119 1896 : }
120 3716 : }
121 :
122 0 : FD_LOG_ERR(( "unable to find random address for memory map after 1000 attempts" ));
123 0 : }
124 :
125 : static fd_shmem_join_info_t fd_shmem_private_map[ FD_SHMEM_PRIVATE_MAP_SLOT_CNT ]; /* Empty on thread group start */
126 : static ulong fd_shmem_private_map_cnt; /* 0 on thread group start */
127 :
128 : void *
129 : fd_shmem_join( char const * name,
130 : int mode,
131 : fd_shmem_joinleave_func_t join_func,
132 : void * context,
133 2496 : fd_shmem_join_info_t * opt_info ) {
134 :
135 : /* Check input args */
136 :
137 2496 : fd_shmem_private_key_t key;
138 2496 : if( FD_UNLIKELY( !fd_shmem_private_key( &key, name ) ) ) {
139 126 : FD_LOG_WARNING(( "bad name (%s)", name ? name : "NULL" ));
140 126 : return NULL;
141 126 : }
142 :
143 2370 : if( FD_UNLIKELY( !( (mode==FD_SHMEM_JOIN_MODE_READ_ONLY) | (mode==FD_SHMEM_JOIN_MODE_READ_WRITE) ) ) ) {
144 0 : FD_LOG_WARNING(( "unsupported join mode (%i) for %s", mode, name ));
145 0 : return NULL;
146 0 : }
147 :
148 2370 : FD_SHMEM_LOCK;
149 :
150 : /* Query for an existing mapping */
151 :
152 2370 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query( fd_shmem_private_map, key, NULL );
153 2370 : if( join_info ) {
154 426 : if( FD_UNLIKELY( join_info->ref_cnt<0L ) ) {
155 0 : FD_LOG_WARNING(( "join/leave circular dependency detected for %s", name ));
156 0 : FD_SHMEM_UNLOCK;
157 0 : return NULL;
158 0 : }
159 426 : join_info->ref_cnt++;
160 :
161 426 : if( opt_info ) *opt_info = *join_info;
162 426 : FD_SHMEM_UNLOCK;
163 426 : return join_info->join;
164 426 : }
165 :
166 : /* Not currently mapped. See if we have enough room. */
167 :
168 1944 : if( FD_UNLIKELY( fd_shmem_private_map_cnt>=FD_SHMEM_JOIN_MAX ) ) {
169 0 : FD_SHMEM_UNLOCK;
170 0 : FD_LOG_WARNING(( "too many concurrent joins for %s", name ));
171 0 : return NULL;
172 0 : }
173 :
174 : /* We have enough room for it. Try to map the memory. */
175 :
176 1944 : fd_shmem_info_t shmem_info[1];
177 1944 : if( FD_UNLIKELY( fd_shmem_info( name, 0UL, shmem_info ) ) ) {
178 48 : FD_SHMEM_UNLOCK;
179 48 : FD_LOG_WARNING(( "unable to query region \"%s\"\n\tprobably does not exist or bad permissions", name ));
180 48 : return NULL;
181 48 : }
182 1896 : ulong page_sz = shmem_info->page_sz;
183 1896 : ulong page_cnt = shmem_info->page_cnt;
184 1896 : ulong sz = page_sz*page_cnt;
185 1896 : int rw = (mode==FD_SHMEM_JOIN_MODE_READ_WRITE);
186 :
187 : /* Map the region into our address space. */
188 :
189 1896 : char path[ FD_SHMEM_PRIVATE_PATH_BUF_MAX ];
190 1896 : int fd = open( fd_shmem_private_path( name, page_sz, path ), rw ? O_RDWR : O_RDONLY, (mode_t)0 );
191 1896 : if( FD_UNLIKELY( fd==-1 ) ) {
192 0 : FD_SHMEM_UNLOCK;
193 0 : FD_LOG_WARNING(( "open(\"%s\",%s,0) failed (%i-%s)", path, rw ? "O_RDWR" : "O_RDONLY", errno, fd_io_strerror( errno ) ));
194 0 : return NULL;
195 0 : }
196 :
197 : /* Generate a random address that we are guaranteed to be able to map */
198 1896 : void * const map_addr = fd_shmem_private_map_rand( sz, page_sz );
199 1896 : if( FD_UNLIKELY( map_addr==MAP_FAILED ) ) FD_LOG_ERR(( "fd_shmem_private_map_rand failed" ));
200 :
201 : /* Note that MAP_HUGETLB and MAP_HUGE_* are implied by the mount point */
202 1896 : void * shmem = mmap( map_addr, sz, PROT_READ|( rw?PROT_WRITE:0 ) , MAP_SHARED|MAP_FIXED, fd, (off_t)0 );
203 :
204 1896 : int mmap_errno = errno;
205 1896 : if( FD_UNLIKELY( close( fd ) ) )
206 0 : FD_LOG_WARNING(( "close(\"%s\") failed (%i-%s); attempting to continue", path, errno, fd_io_strerror( errno ) ));
207 :
208 : /* Validate the mapping */
209 :
210 1896 : if( FD_UNLIKELY( shmem==MAP_FAILED ) ) {
211 0 : FD_SHMEM_UNLOCK;
212 0 : FD_LOG_WARNING(( "mmap(%p,%lu KiB,%s,MAP_SHARED,\"%s\",0) failed (%i-%s)",
213 0 : map_addr, sz>>10, rw ? "PROT_READ|PROT_WRITE" : "PROT_READ", path, mmap_errno, fd_io_strerror( mmap_errno ) ));
214 0 : return NULL;
215 0 : }
216 :
217 1896 : if( FD_UNLIKELY( !fd_ulong_is_aligned( (ulong)shmem, page_sz ) ) ) {
218 0 : if( FD_UNLIKELY( munmap( shmem, sz ) ) )
219 0 : FD_LOG_WARNING(( "munmap(\"%s\",%lu KiB) failed (%i-%s); attempting to continue",
220 0 : path, sz>>10, errno, fd_io_strerror( errno ) ));
221 0 : FD_SHMEM_UNLOCK;
222 0 : FD_LOG_WARNING(( "misaligned memory mapping for \"%s\"\n\t"
223 0 : "This thread group's hugetlbfs mount path (--shmem-path / FD_SHMEM_PATH):\n\t"
224 0 : "\t%s\n\t"
225 0 : "has probably been corrupted and needs to be redone.\n\t"
226 0 : "See 'bin/fd_shmem_cfg help' for more information.",
227 0 : path, fd_shmem_private_base ));
228 0 : return NULL;
229 0 : }
230 :
231 : /* Lock this region in DRAM to prevent it going to swap and (try) to
232 : keep the virtual to physical DRAM mapping fixed for the join
233 : duration. Also advise the kernel to not dump this region to avoid
234 : large shared mappings in concurrent use by multiple processes
235 : destroying the system with core files if a bunch of thread using
236 : this mapping seg fault concurrently. */
237 :
238 1896 : if( FD_UNLIKELY( fd_numa_mlock( shmem, sz ) ) )
239 0 : FD_LOG_WARNING(( "fd_numa_mlock(\"%s\",%lu KiB) failed (%i-%s); attempting to continue",
240 1896 : path, sz>>10, errno, fd_io_strerror( errno ) ));
241 :
242 1896 : if( FD_UNLIKELY( madvise( shmem, sz, MADV_DONTDUMP ) ) )
243 0 : FD_LOG_WARNING(( "madvise(\"%s\",%lu KiB) failed (%i-%s); attempting to continue",
244 1896 : path, sz>>10, errno, fd_io_strerror( errno ) ));
245 :
246 : /* We have mapped the region. Try to complete the join. Note:
247 : map_query above and map_insert could be combined to improve
248 : efficiency further here (and eliminate the paranoid if check in the
249 : process). */
250 :
251 1896 : join_info = fd_shmem_private_map_insert( fd_shmem_private_map, key );
252 1896 : if( FD_UNLIKELY( !join_info ) ) /* should be impossible */
253 0 : FD_LOG_ERR(( "unable to insert region \"%s\" (internal error)", name ));
254 1896 : fd_shmem_private_map_cnt++;
255 :
256 1896 : join_info->ref_cnt = -1L; /* Mark join/leave in progress so we can detect circular join/leave dependencies */
257 1896 : join_info->join = NULL; /* Overridden below */
258 1896 : join_info->shmem = shmem;
259 1896 : join_info->page_sz = page_sz;
260 1896 : join_info->page_cnt = page_cnt;
261 1896 : join_info->mode = mode;
262 : /* join_info->hash handled by insert */
263 : /* join_info->name " */
264 : /* join_info->key " */
265 :
266 1896 : void * join = join_func ? join_func( context, join_info ): shmem; /* Reset by the join func if provided */
267 1896 : if( FD_UNLIKELY( !join ) ) {
268 0 : fd_shmem_private_map_remove( fd_shmem_private_map, join_info );
269 0 : fd_shmem_private_map_cnt--;
270 0 : if( FD_UNLIKELY( munmap( shmem, sz ) ) )
271 0 : FD_LOG_WARNING(( "munmap(\"%s\",%lu KiB) failed (%i-%s); attempting to continue",
272 0 : name, sz>>10, errno, fd_io_strerror( errno ) ));
273 0 : FD_SHMEM_UNLOCK;
274 0 : FD_LOG_WARNING(( "unable to join region \"%s\"", name ));
275 0 : return NULL;
276 0 : }
277 1896 : join_info->ref_cnt = 1UL;
278 1896 : join_info->join = join;
279 :
280 1896 : if( opt_info ) *opt_info = *join_info;
281 1896 : FD_SHMEM_UNLOCK;
282 1896 : return join;
283 1896 : }
284 :
285 : int
286 : fd_shmem_leave( void * join,
287 : fd_shmem_joinleave_func_t leave_func,
288 2235 : void * context ) {
289 2235 : if( FD_UNLIKELY( !join ) ) { FD_LOG_WARNING(( "NULL join" )); return 1; }
290 :
291 2235 : FD_SHMEM_LOCK;
292 :
293 2235 : if( FD_UNLIKELY( !fd_shmem_private_map_cnt ) ) {
294 3 : FD_SHMEM_UNLOCK;
295 3 : FD_LOG_WARNING(( "join is not a current join" ));
296 3 : return 1;
297 3 : }
298 2232 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query_by_join( fd_shmem_private_map, join, NULL );
299 2232 : if( FD_UNLIKELY( !join_info ) ) {
300 0 : FD_SHMEM_UNLOCK;
301 0 : FD_LOG_WARNING(( "join is not a current join" ));
302 0 : return 1;
303 0 : }
304 :
305 2232 : long ref_cnt = join_info->ref_cnt;
306 2232 : if( join_info->ref_cnt>1L ) {
307 426 : join_info->ref_cnt = ref_cnt-1L;
308 426 : FD_SHMEM_UNLOCK;
309 426 : return 0;
310 426 : }
311 :
312 1806 : if( join_info->ref_cnt==-1L ) {
313 0 : FD_SHMEM_UNLOCK;
314 0 : FD_LOG_WARNING(( "join/leave circular dependency detected for %s", join_info->name ));
315 0 : return 1;
316 0 : }
317 :
318 1806 : if( FD_UNLIKELY( join_info->ref_cnt!=1L ) ) /* Should be impossible */
319 0 : FD_LOG_WARNING(( "unexpected ref count for %s; attempting to continue", join_info->name ));
320 :
321 1806 : char const * name = join_info->name; /* Just in case leave_func clobbers */
322 1806 : void * shmem = join_info->shmem; /* " */
323 1806 : ulong page_sz = join_info->page_sz; /* " */
324 1806 : ulong page_cnt = join_info->page_cnt; /* " */
325 :
326 1806 : if( leave_func ) {
327 1746 : join_info->ref_cnt = -1L; /* Mark join/leave is in progress so we can detect join/leave circular dependencies */
328 1746 : leave_func( context, join_info );
329 1746 : }
330 :
331 1806 : int error = 0;
332 1806 : ulong sz = page_sz*page_cnt;
333 1806 : if( FD_UNLIKELY( munmap( shmem, sz ) ) ) {
334 0 : FD_LOG_WARNING(( "munmap(\"%s\",%lu KiB) failed (%i-%s); attempting to continue",
335 0 : name, sz>>10, errno, fd_io_strerror( errno ) ));
336 0 : error = 1;
337 0 : }
338 :
339 1806 : fd_shmem_private_map_remove( fd_shmem_private_map, join_info );
340 1806 : fd_shmem_private_map_cnt--;
341 1806 : FD_SHMEM_UNLOCK;
342 1806 : return error;
343 1806 : }
344 :
345 : int
346 : fd_shmem_join_query_by_name( char const * name,
347 0 : fd_shmem_join_info_t * opt_info ) {
348 0 : fd_shmem_private_key_t key;
349 0 : if( FD_UNLIKELY( !fd_shmem_private_key( &key, name ) ) ) return EINVAL;
350 :
351 0 : FD_SHMEM_LOCK;
352 :
353 0 : if( !fd_shmem_private_map_cnt ) { FD_SHMEM_UNLOCK; return ENOENT; }
354 0 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query( fd_shmem_private_map, key, NULL );
355 0 : if( !join_info ) { FD_SHMEM_UNLOCK; return ENOENT; }
356 0 : if( opt_info ) *opt_info = *join_info;
357 :
358 0 : FD_SHMEM_UNLOCK;
359 0 : return 0;
360 0 : }
361 :
362 : int
363 : fd_shmem_join_query_by_join( void const * join,
364 0 : fd_shmem_join_info_t * opt_info ) {
365 0 : if( FD_UNLIKELY( !join ) ) return EINVAL;
366 :
367 0 : FD_SHMEM_LOCK;
368 :
369 0 : if( !fd_shmem_private_map_cnt ) { FD_SHMEM_UNLOCK; return ENOENT; }
370 0 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query_by_join( fd_shmem_private_map, join, NULL );
371 0 : if( FD_UNLIKELY( !join_info ) ) { FD_SHMEM_UNLOCK; return ENOENT; }
372 0 : if( opt_info ) *opt_info = *join_info;
373 :
374 0 : FD_SHMEM_UNLOCK;
375 0 : return 0;
376 0 : }
377 :
378 : int
379 : fd_shmem_join_query_by_addr( void const * addr,
380 : ulong sz,
381 1419 : fd_shmem_join_info_t * opt_info ) {
382 1419 : if( FD_UNLIKELY( !sz ) ) return ENOENT; /* empty range */
383 1419 : ulong a0 = (ulong)addr;
384 1419 : ulong a1 = a0+sz-1UL;
385 1419 : if( FD_UNLIKELY( a1<a0 ) ) return EINVAL; /* cyclic wrap range */
386 :
387 1419 : FD_SHMEM_LOCK;
388 :
389 1419 : if( !fd_shmem_private_map_cnt ) { FD_SHMEM_UNLOCK; return ENOENT; }
390 1407 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query_by_addr( fd_shmem_private_map, a0, a1, NULL );
391 1407 : if( FD_UNLIKELY( !join_info ) ) { FD_SHMEM_UNLOCK; return ENOENT; }
392 1374 : if( opt_info ) *opt_info = *join_info;
393 :
394 1374 : FD_SHMEM_UNLOCK;
395 1374 : return 0;
396 1407 : }
397 :
398 : int
399 : fd_shmem_join_anonymous( char const * name,
400 : int mode,
401 : void * join,
402 : void * mem,
403 : ulong page_sz,
404 81 : ulong page_cnt ) {
405 :
406 : /* Check input args */
407 :
408 81 : fd_shmem_private_key_t key;
409 81 : if( FD_UNLIKELY( !fd_shmem_private_key( &key, name ) ) ) {
410 0 : FD_LOG_WARNING(( "bad name (%s)", name ? name : "NULL" ));
411 0 : return EINVAL;
412 0 : }
413 :
414 81 : if( FD_UNLIKELY( !( (mode==FD_SHMEM_JOIN_MODE_READ_ONLY) | (mode==FD_SHMEM_JOIN_MODE_READ_WRITE) ) ) ) {
415 0 : FD_LOG_WARNING(( "unsupported join mode (%i) for %s", mode, name ));
416 0 : return EINVAL;
417 0 : }
418 :
419 81 : if( FD_UNLIKELY( !join ) ) {
420 0 : FD_LOG_WARNING(( "NULL join" ));
421 0 : return EINVAL;
422 0 : }
423 :
424 81 : if( FD_UNLIKELY( !mem ) ) {
425 0 : FD_LOG_WARNING(( "NULL mem" ));
426 0 : return EINVAL;
427 0 : }
428 :
429 81 : if( FD_UNLIKELY( !fd_shmem_is_page_sz( page_sz ) ) ) {
430 0 : FD_LOG_WARNING(( "unsupported page_sz (%lu)", page_sz ));
431 0 : return EINVAL;
432 0 : }
433 :
434 81 : if( FD_UNLIKELY( !fd_ulong_is_aligned( (ulong)mem, page_sz ) ) ) {
435 0 : FD_LOG_WARNING(( "misaligned mem" ));
436 0 : return EINVAL;
437 0 : }
438 :
439 81 : if( FD_UNLIKELY( !page_cnt ) ) {
440 0 : FD_LOG_WARNING(( "unsupported page_sz (%lu)", page_sz ));
441 0 : return EINVAL;
442 0 : }
443 :
444 81 : if( FD_UNLIKELY( page_cnt > (ULONG_MAX/page_sz) ) ) {
445 0 : FD_LOG_WARNING(( "too large page cnt (%lu)", page_cnt ));
446 0 : return EINVAL;
447 0 : }
448 :
449 81 : ulong sz = page_cnt*page_sz;
450 81 : ulong a0 = (ulong)mem;
451 81 : ulong a1 = a0 + sz-1UL;
452 81 : if( FD_UNLIKELY( a1<a0 ) ) {
453 0 : FD_LOG_WARNING(( "bad mem range" ));
454 0 : return EINVAL;
455 0 : }
456 :
457 81 : FD_SHMEM_LOCK;
458 :
459 : /* Query for an existing mapping */
460 :
461 81 : fd_shmem_join_info_t * join_info;
462 :
463 81 : join_info = fd_shmem_private_map_query( fd_shmem_private_map, key, NULL );
464 81 : if( FD_UNLIKELY( join_info ) ) {
465 0 : FD_SHMEM_UNLOCK;
466 0 : FD_LOG_WARNING(( "%s already joined", name ));
467 0 : return EINVAL;
468 0 : }
469 :
470 81 : join_info = fd_shmem_private_map_query_by_join( fd_shmem_private_map, join, NULL );
471 81 : if( FD_UNLIKELY( join_info ) ) {
472 0 : FD_SHMEM_UNLOCK;
473 0 : FD_LOG_WARNING(( "%s join handle already in use", name ));
474 0 : return EINVAL;
475 0 : }
476 :
477 81 : join_info = fd_shmem_private_map_query_by_addr( fd_shmem_private_map, a0, a1, NULL );
478 81 : if( FD_UNLIKELY( join_info ) ) {
479 0 : FD_SHMEM_UNLOCK;
480 0 : FD_LOG_WARNING(( "%s join memory already mapped", name ));
481 0 : return EINVAL;
482 0 : }
483 :
484 : /* Not currently mapped. See if we have enough room. */
485 :
486 81 : if( FD_UNLIKELY( fd_shmem_private_map_cnt>=FD_SHMEM_JOIN_MAX ) ) {
487 0 : FD_SHMEM_UNLOCK;
488 0 : FD_LOG_WARNING(( "too many concurrent joins for %s", name ));
489 0 : return EINVAL;
490 0 : }
491 :
492 : /* We have enough room for it. Try to "map" the memory. */
493 :
494 81 : fd_shmem_info_t shmem_info[1];
495 81 : if( FD_UNLIKELY( !fd_shmem_info( name, 0UL, shmem_info ) ) )
496 0 : FD_LOG_WARNING(( "anonymous join to %s will shadow an existing shared memory region in this thread group; "
497 81 : "attempting to continue", name ));
498 :
499 81 : join_info = fd_shmem_private_map_insert( fd_shmem_private_map, key );
500 81 : if( FD_UNLIKELY( !join_info ) ) /* should be impossible */
501 0 : FD_LOG_ERR(( "unable to insert region \"%s\" (internal error)", name ));
502 81 : fd_shmem_private_map_cnt++;
503 :
504 81 : join_info->ref_cnt = 1L;
505 81 : join_info->join = join;
506 81 : join_info->shmem = mem;
507 81 : join_info->page_sz = page_sz;
508 81 : join_info->page_cnt = page_cnt;
509 81 : join_info->mode = mode;
510 : /* join_info->hash handled by insert */
511 : /* join_info->name " */
512 : /* join_info->key " */
513 :
514 81 : FD_SHMEM_UNLOCK;
515 81 : return 0;
516 81 : }
517 :
518 : int
519 : fd_shmem_leave_anonymous( void * join,
520 66 : fd_shmem_join_info_t * opt_info ) {
521 :
522 66 : if( FD_UNLIKELY( !join ) ) {
523 3 : FD_LOG_WARNING(( "NULL join" ));
524 3 : return EINVAL;
525 3 : }
526 :
527 63 : FD_SHMEM_LOCK;
528 :
529 63 : if( FD_UNLIKELY( !fd_shmem_private_map_cnt ) ) {
530 3 : FD_SHMEM_UNLOCK;
531 3 : FD_LOG_WARNING(( "join is not a current join" ));
532 3 : return EINVAL;
533 3 : }
534 :
535 60 : fd_shmem_join_info_t * join_info = fd_shmem_private_map_query_by_join( fd_shmem_private_map, join, NULL );
536 60 : if( FD_UNLIKELY( !join_info ) ) {
537 0 : FD_SHMEM_UNLOCK;
538 0 : FD_LOG_WARNING(( "join is not a current join" ));
539 0 : return EINVAL;
540 0 : }
541 :
542 60 : if( FD_UNLIKELY( join_info->ref_cnt!=1L ) ) {
543 0 : FD_SHMEM_UNLOCK;
544 0 : FD_LOG_WARNING(( "join ref_cnt is not 1" ));
545 0 : return EINVAL;
546 0 : }
547 :
548 60 : if( opt_info ) {
549 60 : *opt_info = *join_info;
550 60 : opt_info->ref_cnt = 0L;
551 60 : }
552 :
553 60 : fd_shmem_private_map_remove( fd_shmem_private_map, join_info );
554 60 : fd_shmem_private_map_cnt--;
555 60 : FD_SHMEM_UNLOCK;
556 60 : return 0;
557 60 : }
558 :
559 : #endif
|
