Fix: atomic_add_unless() returns true/false rather than prior value
authorFrancis Deslauriers <francis.deslauriers@efficios.com>
Wed, 8 Mar 2017 16:50:38 +0000 (11:50 -0500)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Wed, 8 Mar 2017 16:55:45 +0000 (11:55 -0500)
commit42e537c5128eb07e080029134e29c8e3a0c98243
tree666eafb61a2ad53355fedd40da9f90fda4b2bb60
parent225580b5f6eb2266ffe75c30c0452db141e73675
Fix: atomic_add_unless() returns true/false rather than prior value

The previous implementation assumed that `atomic_add_unless` returned
the prior value of the atomic counter when in fact it returned if the
addition was performed (true) or not performed (false).
Since `atomic_add_unless` can not return INT_MAX, the `lttng_kref_get`
always returned that the call was successful.

This issue had a low likelihood of being triggered since the two refcounts
of the counters used with this call are both bounded by the maximum
number of file descriptors on the system.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
wrapper/kref.h
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