2003-03-31 21:57:09 +02:00
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\documentclass{article}
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\usepackage[fancyhdr,pdf]{latex2man}
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\input{common.tex}
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\begin{document}
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\begin{Name}{3}{unw\_set\_caching\_policy}{David Mosberger-Tang}{Programming Library}{unw\_set\_caching\_policy}unw\_set\_caching\_policy -- set unwind caching policy
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\end{Name}
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\section{Synopsis}
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\File{\#include $<$libunwind.h$>$}\\
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\Type{int} \Func{unw\_set\_caching\_policy}(\Type{unw\_addr\_space\_t} \Var{as}, \Type{unw\_caching_policy\_t} \Var{policy});\\
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\section{Description}
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The \Func{unw\_set\_caching\_policy}() routine sets the caching policy
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of address space \Var{as} to the policy specified by argument
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\Var{policy}. The \Var{policy} argument can take one of three
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possible values:
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\begin{description}
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\item[\Const{UNW\_CACHE\_NONE}] Turns off caching completely. This
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also implicitly flushes the contents of all caches as if
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\Func{unw\_flush\_cache}() had been called.
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\item[\Const{UNW\_CACHE\_GLOBAL}] Enables caching using a global cache
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that is shared by all threads. If global caching is unavailable or
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unsupported, \Prog{libunwind} may fall back on using a per-thread
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cache, as if \Const{UNW\_CACHE\_PER\_THREAD} had been specified.
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\item[\Const{UNW\_CACHE\_PER\_THREAD}] Enables caching using
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thread-local caches. If a thread-local caching are unavailable or
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unsupported, \Prog{libunwind} may fall back on using a global cache,
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as if \Const{UNW\_CACHE\_GLOBAL} had been specified.
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\end{description}
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If caching is enabled, an application must be prepared to make
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appropriate calls to \Func{unw\_flush\_cache}() whenever the target
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changes in a way that could affect the validity of cached information.
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For example, after unloading (removing) a shared library,
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\Func{unw\_flush\_cache}() would have to be called (at least) for the
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address-range that was covered by the shared library.
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For address spaces created via \Func{unw\_create\_addr\_space}(3),
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caching is turned off by default. For the local address space
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\Func{unw\_local\_addr\_space}, caching is turned on by default.
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\section{Return Value}
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On successful completion, \Func{unw\_set\_caching\_policy}() returns 0.
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Otherwise the negative value of one of the error-codes below is
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returned.
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\section{Thread and Signal Safety}
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\Func{unw\_set\_caching\_policy}() is thread-safe but \emph{not} safe
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to use from a signal handler.
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\section{Errors}
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\begin{Description}
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\item[\Const{UNW\_ENOMEM}] The desired caching policy could not be
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established because the application is out of memory.
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\end{Description}
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\section{See Also}
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\SeeAlso{libunwind(3)},
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\SeeAlso{unw\_create\_addr\_space(3)},
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\SeeAlso{unw\_flush\_cache(3)}
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\section{Author}
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\noindent
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David Mosberger-Tang\\
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Hewlett-Packard Labs\\
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Palo-Alto, CA 94304\\
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Email: \Email{davidm@hpl.hp.com}\\
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WWW: \URL{http://www.hpl.hp.com/research/linux/libunwind/}.
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\LatexManEnd
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\end{document}
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