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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:( u3 R1 M% k/ S' a) Z" Q
root@tl:~# ipcs -l7 P) I5 V4 M! O( b1 [- b
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------ Shared Memory Limits --------
. V, d8 U- ` T4 P' E5 ]max number of segments = 4096
# m5 f; b3 c4 o5 L: kmax seg size (kbytes) = 32768- X1 I, Z' I; ~0 C9 b
max total shared memory (kbytes) = 83886087 D' Z. V/ k1 [; n
min seg size (bytes) = 1
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% u: K3 C6 _ E------ Semaphore Limits --------
& Q- T% [) `) Q2 P, ~" Umax number of arrays = 128 Q5 D3 u; f( g% [2 q
max semaphores per array = 250) R C( J: m# e- x7 H
max semaphores system wide = 32000
/ o8 y/ t+ y" A! \. V6 i; pmax ops per semop call = 32
) [' t0 k1 `" c' }7 U* G: tsemaphore max value = 32767. K1 k: H. o/ k y
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------ Messages Limits --------
3 _: {2 K3 D. a! r* J! i1 cmax queues system wide = 178+ e" _$ b2 ]0 X6 l2 H7 V: {; v
max size of message (bytes) = 8192
% V( l% c0 b, H7 @( s3 L! l1 C/ fdefault max size of queue (bytes) = 16384" E1 }, S. c, @5 R. \/ _$ ^3 q- z
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但是,用ipcs -a
8 ]! t) Q2 h) s) A: e3 v4 troot@tl:~# ipcs -a/ [% d* Q2 O3 K2 q9 Y
n, J+ U0 G& ], `( @' c, E3 n------ Shared Memory Segments --------" p, m) k5 d+ H& _1 |
key shmid owner perms bytes nattch status
6 I9 Y8 @, c2 {4 m8 I0x00000000 0 root 600 1024 1 dest 3 z# {7 x. j7 }- F4 h1 }
0x00000000 196609 root 600 1024 1 dest 9 H% Y5 J; T6 x. B4 Y4 d- J) s8 ~
5 T) `' u9 l3 F/ P1 j2 V2 u- O0 ^------ Semaphore Arrays --------( F$ ~( ]1 K8 z; E
key semid owner perms nsems
; h: v: Y% u( s- r0x6411074d 0 root 600 1
6 H( p1 v( a5 |7 j& M0x64110957 163841 root 600 1 2 n3 Y% F) a: D# l1 R* Q3 `
0x641109a1 196610 root 600 1 $ }' U1 ?" R+ H1 J; v4 @* I" x
. K* H" e9 c' Q/ b+ n( y+ T------ Message Queues --------. @; f; u. i4 E9 B1 u+ \/ W, `7 `
key msqid owner perms used-bytes messages ' @- k# W; g! a O0 C6 O1 |2 O8 t
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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?% B% R' N ]6 W6 Z
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