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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_remove_named_event

PAPI_remove_named_event(3)					       PAPI						PAPI_remove_named_event(3)

NAME

       PAPI_remove_named_event -

       removes a named hardware event from a PAPI event set.

SYNOPSIS

Detailed Description
       A hardware event can be either a PAPI Preset or a native hardware
       event code.  For a list of PAPI preset events, see PAPI_presets or
       run the papi_avail utility in the PAPI distribution.  PAPI Presets
       can be passed to PAPI_query_event to see if they exist on the
       underlying architecture.  For a list of native events available on
       the current platform, run papi_native_avail in the PAPI distribution.

       @par C Interface:
       int PAPI_remove_event( int  EventSet, int  EventCode );

       @param[in] EventSet
	  -- an integer handle for a PAPI event set as created
		by PAPI_create_eventset
       @param[in] EventName
	  -- a defined event such as PAPI_TOT_INS or a native event.

       @retval PAPI_OK
	   Everything worked.
       @retval PAPI_EINVAL
	   One or more of the arguments is invalid.
       @retval PAPI_ENOINIT
	   The PAPI library has not been initialized.
       @retval PAPI_ENOEVST
	   The EventSet specified does not exist.
       @retval PAPI_EISRUN
	   The EventSet is currently counting events.
       @retval PAPI_ECNFLCT
	   The underlying counter hardware can not count this
		  event and other events in the EventSet simultaneously.
       @retval PAPI_ENOEVNT
	   The PAPI preset is not available on the underlying hardware.

       @par Example:

       *   char EventName = "PAPI_TOT_INS";
       *   int EventSet = PAPI_NULL;
       *   int ret;
       *
       *   // Create an empty EventSet
       *   ret = PAPI_create_eventset(&EventSet);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Add Total Instructions Executed to our EventSet
       *   ret = PAPI_add_named_event(EventSet, EventName);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Start counting
       *   ret = PAPI_start(EventSet);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Stop counting, ignore values
       *   ret = PAPI_stop(EventSet, NULL);
       *   if (ret != PAPI_OK) handle_error(ret);
       *
       *   // Remove event
       *   ret = PAPI_remove_named_event(EventSet, EventName);
       *   if (ret != PAPI_OK) handle_error(ret);
       *

       See Also:
	   PAPI_remove_event
	    PAPI_query_named_event
	    PAPI_add_named_event

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

Version 5.2.0.0 						  Tue Jun 17 2014					PAPI_remove_named_event(3)
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