如何删除共享内存

lee_scs

如何删除共享内存？

我现在只知道建立一个共享内存，也会用ipcs去查看，但如何删除呢？

莫愁

ipcrm
man shmctl

liubinbj

The shmctl (“SHared Memory ConTroL”) call returns information about a shared
memory segment and can modify it.The first parameter is a shared memory segment
identifier.
   To obtain information about a shared memory segment, pass IPC_STAT as the
second argument and a pointer to a struct shmid_ds.
   To remove a segment, pass IPC_RMID as the second argument, and pass NULL as the
third argument.The segment is removed when the last process that has attached it
finally detaches it.
   Each shared memory segment should be explicitly deallocated using shmctl when
you’re finished with it, to avoid violating the systemwide limit on the total number of
shared memory segments. Invoking exit and exec detaches memory segments but
does not deallocate them.

这个够详细了把。

lee_scs

不好意思，弱弱地问一下

shmctl 是程序里写的吧。

ipcrm后面跟什么参数？是不是shmid

删除共享内存是把这段内存释放出来可供其它程序用？还是把里面的内容都删掉

莫愁

原帖由 lee_scs 于 2006-5-12 14:48 发表
不好意思，弱弱地问一下

shmctl 是程序里写的吧。

ipcrm后面跟什么参数？是不是shmid

删除共享内存是把这段内存释放出来可供其它程序用？还是把里面的内容都删掉

man ipcrm

stiandao

/* 初始化共享内存 */
   key=0x00111111;
   shmid=shmget(key,1024,0666);
   shmctl(shmid,IPC_RMID,0);

zengjin8310

昏倒, 几乎无语
先ipcs -m 看看那些shmid该删
然后ipcrm -m shmid