Re: pthreads slows computer & kills program

Ian Semmel <anyone@xxxxxxxxxxxxxxxxx> wrote:


"Rainer Weikusat" <rweikusat@xxxxxxxxxxx> wrote in message
news:87abjfmq2s.fsf@xxxxxxxxxxxxxxxxx:

"Ian Semmel" <anyone@xxxxxxxxxxxxxxxxx> writes:

[...]


If you read my post, you might see what the real question was.


Quoting this:

,----
| I basically have
|
| pthread_mutex_init ( & mutex, 0 );
| pthread_cond_init ( & cond, 0 );
| pthread_mutex_lock ( & mutex );
| cerr << "Ready to call cond_wait" << endl; // does this
| pthread_cond_wait(& cond, & mutex);
| cerr << "Got past cond_wait " << rc << endl; // doesn't get here
|
| Computer just slows down and eventually a 'Killed' message is displayed
`----

Expanded into something which actually compiles:

#include <pthread.h>
#include <stdio.h>

int main(void)
{
pthread_mutex_t mutex;
pthread_cond_t cond;
int rc;

pthread_mutex_init ( & mutex, 0 );
pthread_cond_init ( & cond, 0 );
pthread_mutex_lock ( & mutex );

fputs("Ready to call cond_wait\n", stderr);

rc = pthread_cond_wait(& cond, & mutex);

fprintf(stderr, "Got past cond wait: %d\n", rc);
return 0;
}

Compiling this with gcc a.c -lpthread yields an exectuable which just
blocks, consuming no CPU time at all.

Conclusion: Your problem is that you believe to be suffering harmful
effects caused by phenomena which are demonstrably absent. Consider
consulting a psychatrist.

HTH.

Well, that is what it is supposed to do until it is signalled. It is in
a thread.

I suppose I could have included the 12000 lines or so of the program in
the post but I thought I was dealing with experienced programmers.

I should have known better.

You might lost the attitude. You're _asking_ people to help you with
your problem, they aren't getting _paid_ to help you, and you haven't
asked a recognizable question, just posted some code with prceious
little explanation. I'd suggest you actually _read_ some of the
references on how to ask an _intelligent_ question.

Jerry

.

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