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80 lines
1.9 KiB
Plaintext
80 lines
1.9 KiB
Plaintext
.TH "PAPI_attach" 3 "Wed Jun 25 2025 19:30:48" "Version 7.2.0.0" "PAPI" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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PAPI_attach \- Attach PAPI event set to the specified thread id\&.
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.SH SYNOPSIS
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.br
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.PP
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.SH "Detailed Description"
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.PP
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.PP
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\fBC Interface:\fP
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.RS 4
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#include <\fBpapi\&.h\fP>
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.br
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int PAPI_attach( int EventSet, unsigned long tid );
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.RE
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.PP
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\fBPAPI_attach\fP is a wrapper function that calls \fBPAPI_set_opt\fP to allow PAPI to monitor performance counts on a thread other than the one currently executing\&. This is sometimes referred to as third party monitoring\&. \fBPAPI_attach\fP connects the specified EventSet to the specified thread; \fBPAPI_detach\fP breaks that connection and restores the EventSet to the original executing thread\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIEventSet\fP An integer handle for a PAPI EventSet as created by \fBPAPI_create_eventset\fP\&.
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.br
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\fItid\fP A thread id as obtained from, for example, \fBPAPI_list_threads\fP or \fBPAPI_thread_id\fP\&.
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.RE
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.PP
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\fBReturn values\fP
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.RS 4
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\fIPAPI_ECMP\fP This feature is unsupported on this component\&.
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.br
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\fIPAPI_EINVAL\fP One or more of the arguments is invalid\&.
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.br
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\fIPAPI_ENOEVST\fP The event set specified does not exist\&.
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.br
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\fIPAPI_EISRUN\fP The event set is currently counting events\&.
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.RE
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.PP
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\fBExamples:\fP
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.RS 4
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.PP
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.nf
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int EventSet = PAPI_NULL;
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unsigned long pid;
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pid = fork( );
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if ( pid <= 0 )
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exit( 1 );
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if ( PAPI_create_eventset( &EventSet ) != PAPI_OK )
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exit( 1 );
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// Add Total Instructions Executed to our EventSet
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if ( PAPI_add_event( EventSet, PAPI_TOT_INS ) != PAPI_OK )
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exit( 1 );
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// Attach this EventSet to the forked process
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if ( PAPI_attach( EventSet, pid ) != PAPI_OK )
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exit( 1 );
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.fi
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.PP
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBPAPI_set_opt\fP
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.PP
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\fBPAPI_list_threads\fP
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.PP
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\fBPAPI_thread_id\fP
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.PP
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\fBPAPI_thread_init\fP
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.RE
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.PP
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.SH "Author"
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.PP
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Generated automatically by Doxygen for PAPI from the source code\&.
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