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Red Hat Bugzilla – Attachment 591718 Details for
Bug 831900
system call sys_semget costs more time
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calls semget in a while(1) statement
b.c (text/x-csrc), 944 bytes, created by
slh
on 2012-06-14 03:17:53 UTC
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Description:
calls semget in a while(1) statement
Filename:
MIME Type:
Creator:
slh
Created:
2012-06-14 03:17:53 UTC
Size:
944 bytes
patch
obsolete
>#include <stdio.h> >#include <stdlib.h> >#include <errno.h> >#include <sys/ipc.h> >#include <sys/sem.h> >#include <sys/time.h> > >int InitSem(const key_t key, const int nsems) >{ > int i = 0; > if( (key <= 0) || (nsems <= 0) ) > { > return (-1); > } > > int sem_id = semget(key, 0, 0); > if( sem_id < 0 ) > { > sem_id = semget(key, nsems, IPC_CREAT|IPC_EXCL|0666); > if ( sem_id < 0) > { > if( errno == EEXIST ) > { > sem_id = semget(key, 0, 0); > return (sem_id); > } > else > { > return (-1); > } > } > else > { > for( i = 0; i < nsems; ++i ) > { > int status = semctl(sem_id, i, SETVAL); > if( status < 0 ) > { > return (-1); > } > } > > return (sem_id); > } > } > > return (sem_id); >} > > >int main(int argc ,char ** argv) >{ > key_t key = 6225; > int nsems = 2; > int sem_id = 0; > sem_id = InitSem(key, nsems); > > while(1) > { > sem_id = semget(key, 0, 0); > } > >}
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