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authorLennart Poettering <lennart@poettering.net>2016-08-15 18:12:01 +0200
committerLennart Poettering <lennart@poettering.net>2016-08-22 16:14:21 +0200
commit05a98afd3e0513de50c5949b7fa50ff0989d68bc (patch)
tree74ef3320a2f75dac4285843098b2b33e5e0c817c /src/shared/gcrypt-util.h
parentecddb2b586d1b69e5538fb85262d2b9e6d253ac0 (diff)
core: add Ref()/Unref() bus calls for units
This adds two (privileged) bus calls Ref() and Unref() to the Unit interface. The two calls may be used by clients to pin a unit into memory, so that various runtime properties aren't flushed out by the automatic GC. This is necessary to permit clients to race-freely acquire runtime results (such as process exit status/code or accumulated CPU time) on successful service termination. Ref() and Unref() are fully recursive, hence act like the usual reference counting concept in C. Taking a reference is a privileged operation, as this allows pinning units into memory which consumes resources. Transient units may also gain a reference at the time of creation, via the new AddRef property (that is only defined for transient units at the time of creation).
Diffstat (limited to 'src/shared/gcrypt-util.h')
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