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Full Discussion: scheduling a process
Top Forums Programming scheduling a process Post 47033 by a25khan on Sunday 1st of February 2004 06:48:18 PM
Old 02-01-2004
scheduling a process

hi there i m having a confusion here with the looping in this example below. can someone help me out!?



#include<stdio.h>
main()
{
char it = 'a';
char stop = 'z';
int x,ret;

for(; it<'f';it++)
{
// for(x=0; x<32000;x++)
write(1,&it,1);
}

x=fork();

if(x);
{
it='F'; stop = 'Z';
}
write(1,&it,1);
write(1,&stop,1);

for(; it<=stop;it++)
{
for(x=0;x<32000;x++);
write(1,&it,1);
}

}
=======================
heres my output
: abcdeFZFGHIJKLMNOPQRSTUVWXYZFZFGHIJKLMNOPQRSTUVWXYZ

for this example i have, the text says it is an example of "sheduling of a process". i can't really sort out why does it say so?
can someone tell me whats the difference between having

for(; it<'f';it++)
{
for(x=0; x<32000;x++)
write(1,&it,1);
}

and

for(; it<'f';it++)
{
for(x=0; x<32000;x++); //i don't get this part!
write(1,&it,1); //how does write work
}


also a similar question

if(x);
{
any code
}

and
if(x)
{
any code
}

Thank you
 

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PAPI_remove_event(3)						       PAPI						      PAPI_remove_event(3)

NAME
PAPI_remove_event - removes a 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] EventCode -- 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_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: * 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_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); * * // Stop counting, ignore values * ret = PAPI_stop(EventSet, NULL); * if (ret != PAPI_OK) handle_error(ret); * * // Remove event * ret = PAPI_remove_event(EventSet, PAPI_TOT_INS); * if (ret != PAPI_OK) handle_error(ret); * See Also: PAPI_cleanup_eventset PAPI_destroy_eventset PAPI_event_name_to_code PAPI_presets PAPI_add_event PAPI_add_events Author Generated automatically by Doxygen for PAPI from the source code. Version 5.2.0.0 Tue Jun 17 2014 PAPI_remove_event(3)
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