Re: pthread_init_mutex problem

[ssundaragopalan@hss.hns.com]

hi pankaj,
      thnx for your Input...i found that your code was not taking much of
CPU after introducing a sleep for once mili sec.
i have a different scene here..i have multiple threads trying to do the
same operations as what your main does.
Please have a look at this and give me your suggestions

#include "pthread.h"
#include <assert.h>

int main()
{
     CreateThread(NULL,0,mythread1,"Thread1",0,&thrId1);
     CreateThread(NULL,0,mythread1,"Thread2",0,&thrId2);

     for(;;)
     {
          Sleep(1);
     }
  return 0;
}

DWORD WINAPI mythread1(void*ptr)
{
     int i=0;
for(i = 0; i != 1000000; i++)
     {

          pthread_mutex_t mutex;
          assert(pthread_mutex_init(&mutex, NULL) == 0);
          assert(mutex != NULL);

          assert(pthread_mutex_lock(&mutex) == 0);
          printf("Locked:%s\n",(char*)ptr);
          Sleep(1);
          assert(pthread_mutex_unlock(&mutex) == 0);
          printf("UnLocked\n");
          assert(pthread_mutex_destroy(&mutex)==0);
          printf("Destroy\n");
     }
}

regds & thnx
srikanth




pankaj bathwal <pbathwal@yahoo.com> on 05/04/2002 10:53:46 AM

To:   Srikanth Sundaragopalan/HSSBLR
cc:

Subject:  Re: pthread_init_mutex problem




hi,
i think problem is not in the pthread_mutex_init
i have tried the below code and cpu never goes above
15%.....
Use debugger to find if problem is really in the
pthread_mutex_init


#include "pthread.h"
#include <assert.h>




int main()
{

     for(int i = 0; i != 100; i++)
     {

          pthread_mutex_t mutex;
          assert(pthread_mutex_init(&mutex, NULL) == 0);
          assert(mutex != NULL);
          assert(pthread_mutex_lock(&mutex) == 0);
          assert(pthread_mutex_unlock(&mutex) == 0);
     }

  return 0;
}


cheers
pankaj




--- ssundaragopalan@hss.hns.com wrote:
>
>
> hi all,
>         i am new to this mailing list. i am using
> pthreads for windows and
> have the following problems.
> The function pthread_mutex_init is taking up CPU to
> a large extent....In
> our program we have a lock for each data structure
> and this data struture
> is initialized every time a new messsage is
> received. So under Load
> conditions the CPU utilization is reaching 100%.
> Can anyone suggest some ways to bring down this.
>
> regds,
> srikanth
>
>
>
>
>
>
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