.TH "PAPI_start_counters" 3 "Fri Feb 22 2019" "Version 5.7.0.0" "PAPI" \" -*- nroff -*-
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.SH NAME
PAPI_start_counters \- 
.PP
Start counting hardware events\&.  

.SH SYNOPSIS
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.SH "Detailed Description"
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.nf
@par C Interface:
\#include <papi.h> @n
int PAPI_start_counters( int *events, int array_len );

.fi
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\fBParameters:\fP
.RS 4
\fI*events\fP an array of codes for events such as PAPI_INT_INS or a native event code 
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\fIarray_len\fP the number of items in the *events array
.RE
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\fBReturn values:\fP
.RS 4
\fIPAPI_EINVAL\fP One or more of the arguments is invalid\&. 
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\fIPAPI_EISRUN\fP Counters have already been started, you must call \fBPAPI_stop_counters()\fP before you call this function again\&. 
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\fIPAPI_ESYS\fP A system or C library call failed inside PAPI, see the errno variable\&. 
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\fIPAPI_ENOMEM\fP Insufficient memory to complete the operation\&. 
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\fIPAPI_ECNFLCT\fP The underlying counter hardware cannot count this event and other events in the EventSet simultaneously\&. 
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\fIPAPI_ENOEVNT\fP The PAPI preset is not available on the underlying hardware\&.
.RE
.PP
\fBPAPI_start_counters()\fP starts counting the events named in the *events array\&. This function cannot be called if the counters have already been started\&. The user must call \fBPAPI_stop_counters()\fP to stop the events explicitly if he/she wants to call this function again\&. It is the user's responsibility to choose events that can be counted simultaneously by reading the vendor's documentation\&. The length of the *events array should be no longer than the value returned by \fBPAPI_num_counters()\fP\&.
.PP
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.nf
if( PAPI_start_counters( Events, num_hwcntrs ) != PAPI_OK )
    handle_error(1);
 *  
.fi
.PP
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\fBSee Also:\fP
.RS 4
\fBPAPI_stop_counters()\fP \fBPAPI_add_event()\fP \fBPAPI_create_eventset()\fP 
.RE
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.SH "Author"
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Generated automatically by Doxygen for PAPI from the source code\&.