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您好, 在使用OMAPL138 evm过程中,我使用了MessageQ和ringIO来传输数据。利用ipcs -l ,情况如下:6 I; f/ s( v8 ~/ m
root@tl:~# ipcs -l& Q. B( u0 \' U4 r
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------ Shared Memory Limits --------; ?$ n$ I5 J, Q; ^& P
max number of segments = 40965 ^1 Q. ]$ o' ` L4 r$ e
max seg size (kbytes) = 32768
; u3 w" w% f4 omax total shared memory (kbytes) = 83886081 o6 ^3 I0 B1 {6 l" L; L, Y3 i2 G
min seg size (bytes) = 1
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% r d: ?2 i6 J W0 ]------ Semaphore Limits --------9 `; U) h( M; Q0 Y5 d- G
max number of arrays = 128
8 F3 n) G# ^( U( Zmax semaphores per array = 2505 U, s* C& Y+ Z9 X: z J& U
max semaphores system wide = 32000
5 f; t W" |( Mmax ops per semop call = 32
9 n" [ ~4 P1 asemaphore max value = 32767. t7 r: A6 R4 r( q- l, V( D8 F
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------ Messages Limits --------
8 s3 o, K; d8 s1 V/ K8 Omax queues system wide = 1787 X7 j# l* k# Q1 a) h' |7 y# E6 S
max size of message (bytes) = 8192
7 i1 R/ D4 i/ ?8 u: bdefault max size of queue (bytes) = 16384
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但是,用ipcs -a ! e+ h3 v O' c0 X& u, [( A, O
root@tl:~# ipcs -a# Z4 h# I+ N3 K9 s
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------ Shared Memory Segments --------
! N% K+ m3 ?- f( F# T& ?0 U/ W4 okey shmid owner perms bytes nattch status
- G; E8 K: O4 L' J1 ^0x00000000 0 root 600 1024 1 dest 9 a. |6 {' }5 b9 x/ `0 Z
0x00000000 196609 root 600 1024 1 dest
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# ~; {; d' U% ~8 @$ r/ h$ b K------ Semaphore Arrays --------
& G! @- d* E) t2 L9 x' I# Wkey semid owner perms nsems
' Z) A8 a; E8 u W+ q$ Q* }9 }0x6411074d 0 root 600 1
1 [# u6 l; m l. g0x64110957 163841 root 600 1
- W/ k" `6 [ @' `3 D+ f, C9 I0 k0 T0x641109a1 196610 root 600 1
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7 J: G4 u. O) f2 ~8 S% R% l$ j0 J------ Message Queues --------
6 }. v h+ A) q9 Lkey msqid owner perms used-bytes messages 2 J! o( l& Z! N6 W) G
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请问,我的共享内存使用大小为 (float *)ring_buffer_acquired(ad->buffer, 2320 * sizeof(float)*18); 远大于1024BYTE ,请问为什么?! k9 O) D- e! v& e! L X6 f( [* B
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