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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LEARN ABOUT CENTOS
papi_remove_event
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)