Re: pthread_init_mutex problem

[ssundaragopalan at hss dot hns dot com]

hi ppl,
       thnx for your valuble inputs. ..actually i have implmented critical
section as a solution and it works fine...the CPU utilization has come down
to 60% from 100%...

thnx & regds,
srikanth




5qduh001@sneakemail.com on 05/04/2002 02:42:43 PM

To:   Srikanth Sundaragopalan/HSSBLR, pthreads-win32@sources.redhat.com
cc:

Subject:  Re: pthread_init_mutex problem




I'd be interested in measurements comparing calling pthread_mutex_init()
vs. using PTHREAD_MUTEX_INITIALIZER.

I.e the code from the earlier e-mail:
pthread_mutex_t mutex;
assert(pthread_mutex_init(&mutex, NULL) == 0);

vs.

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

I haven't looked at the win32 pthread source to see what happens in either,
but I can only imagine that the latter would be more efficient if the
implementation in win32 pthreads is anything like what most other
implementations do (a linux implementation in this case), basically:

pthread_mutex_t mutex = {0, 0, 0, PTHREAD_MUTEX_FAST_NP, {0, 0}};

As I understand it, using PTHREAD_MUTEX_INITIALIZER should also allow you
to avoid the call to pthread_mutex_destroy() thus another saving.

If the PTHREAD_MUTEX_INITIALIZER is faster as I suspect, please let us know
and by roughly how much :).

Good luck,
Dave

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