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Full Discussion: Problem with POSIX pthreads and virtual memory
Top Forums Programming Problem with POSIX pthreads and virtual memory Post 302222216 by JEscola on Wednesday 6th of August 2008 08:55:12 AM
Old 08-06-2008
Data Problem with POSIX pthreads and virtual memory
Hi, i have this code... in order to test my problem...
Code:
#include <stdio.h>
#include <iostream>
#include <pthread.h>
static void* cliente(void *datos);

int main()
{
        pthread_attr_t tattr;
        int ret;
        size_t size = PTHREAD_STACK_MIN + 0x0100;
        ret = pthread_attr_init(&tattr);
        ret = pthread_attr_setstacksize(&tattr, size);
        ret= pthread_attr_setdetachstate(&tattr,PTHREAD_CREATE_JOINABLE);
        ret=0;
        pthread_t mythread[401];
        while(ret<400)
        {
                                int error=pthread_create((pthread_t *)&mythread[ret],&tattr,cliente,NULL);
                                if(error==0)pthread_detach((pthread_t)mythread);

                ret++;
        }

        while(true)
        {}
}
static void* cliente(void *datos)
{
        char *buff=(char *)malloc(100000);
        sleep(15);
        free(buff);
        buff=NULL;
        pthread_exit(NULL);

}

this code uses aprox. 370 Mb of virtual memory, But when the threads finish it does not liberate the above mentioned memory.

Any body can help me??
Last edited by jim mcnamara; 08-06-2008 at 10:55 AM.. Reason: added code tags
 

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LEARN ABOUT CENTOS

papi_start

PAPI_start(3)							       PAPI							     PAPI_start(3)

NAME

       PAPI_start -

       Start counting hardware events in an event set.

SYNOPSIS

Detailed Description
       C Interface:
	   #include <papi.h>
	    int PAPI_start( int  EventSet );

       Parameters:
	   EventSet -- an integer handle for a PAPI event set as created by PAPI_create_eventset

       Return values:
	   PAPI_OK
	   PAPI_EINVAL -- One or more of the arguments is invalid.
	   PAPI_ESYS -- A system or C library call failed inside PAPI, see the errno variable.
	   PAPI_ENOEVST -- The EventSet specified does not exist.
	   PAPI_EISRUN -- The EventSet is currently counting events.
	   PAPI_ECNFLCT -- The underlying counter hardware can not count this event and other events in the EventSet simultaneously.
	   PAPI_ENOEVNT -- The PAPI preset is not available on the underlying hardware.

       PAPI_start starts counting all of the hardware events contained in the previously defined EventSet. All counters are implicitly set to zero
       before counting. Assumes an initialized PAPI library and a properly added event set.

       Example:

	   *  int EventSet = PAPI_NULL;
	   *  long long values[2];
	   *  int ret;
	   *
	   *  ret = PAPI_create_eventset(&EventSet);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *
	   *  // Add Total Instructions Executed to our EventSet
	   *  ret = PAPI_add_event(EventSet, PAPI_TOT_INS);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *
	   *  // Start counting
	   *  ret = PAPI_start(EventSet);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *  poorly_tuned_function();
	   *  ret = PAPI_stop(EventSet, values);
	   *  if (ret != PAPI_OK) handle_error(ret);
	   *  printf("%lld
",values[0]);
	   *

       See Also:
	   PAPI_create_eventset PAPI_add_event PAPI_stop

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014						     PAPI_start(3)
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