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NAME | C SYNOPSIS | CAVEAT | DESCRIPTION | RETURN VALUES | SEE ALSO | COLOPHON |
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PMCONTEXTWALK(3) Library Functions Manual PMCONTEXTWALK(3)
__pmContextWalk - traversal of all PMAPI contexts
#include "pmapi.h"
#include "libpcp.h"
void (*__pmContextWalkCallback)(void *handle, __pmContext *ctxp);
int __pmContextWalk(void *handle, __pmContextWalkCallback
callback,
cc ... -lpcp
This documentation is intended for internal Performance Co-Pilot
(PCP) developer use.
These interfaces are not part of the PCP APIs that are guaranteed
to remain fixed across releases, and they may not work, or may
provide different semantics at some point in the future.
__pmContextWalk provides a thread-safe and lock-safe way of pro‐
cessing each active PMAPI context in turn.
For each valid PMAPI context, callback is called with handle
passed in from the __pmContextWalk caller and ctxp pointing to a
context for which the c_lock lock has been acquired. The handle
argument is a pointer to an arbitrary object that may be shared
between the __pmContextWalk caller and the callback routine, but
is not otherwise accessed by __pmContextWalk, so could be NULL.
The per-context c_lock is released by __pmContextWalk after call‐
back is called and should not be unlocked by callback.
For the duration of the call to __pmContextWalk all context initi‐
ation (via pmNewContext(3), pmDupContext(3) or
pmReconnectContext(3)) and teardown (via pmDestroyContext(3)) is
blocked.
__pmContextWalk returns the number of contexts processed and hence
the number of times callback was called, else a negative value
suitable for reporting with pmErrStr(3).
PMAPI(3), pmDestroyContext(3), pmDupContext(3), pmErrStr(3),
pmNewContext(3) and pmReconnectContext(3).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
pcp@groups.io. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2026-01-16. (At that time, the date of the most recent commit
that was found in the repository was 2026-01-16.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
Performance Co-Pilot PCP PMCONTEXTWALK(3)
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HTML rendering created 2026-01-16 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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