diff options
Diffstat (limited to 'libbuild2')
| -rw-r--r-- | libbuild2/context.cxx | 8 | ||||
| -rw-r--r-- | libbuild2/context.hxx | 7 |
2 files changed, 14 insertions, 1 deletions
diff --git a/libbuild2/context.cxx b/libbuild2/context.cxx index 80343bd..d460fa7 100644 --- a/libbuild2/context.cxx +++ b/libbuild2/context.cxx @@ -765,6 +765,8 @@ namespace build2 } else if (ctx_.phase != n) { + ++contention; + ctx_.sched.deactivate (false /* external */); for (; ctx_.phase != n; v->wait (l)) ; r = !fail_; @@ -781,6 +783,8 @@ namespace build2 { if (!lm_.try_lock ()) { + ++contention; + ctx_.sched.deactivate (false /* external */); lm_.lock (); ctx_.sched.activate (false /* external */); @@ -901,6 +905,8 @@ namespace build2 } else // phase != n { + ++contention; + ctx_.sched.deactivate (false /* external */); for (; ctx_.phase != n; v->wait (l)) ; r = !fail_; @@ -913,6 +919,8 @@ namespace build2 { if (!lm_.try_lock ()) { + ++contention; + ctx_.sched.deactivate (false /* external */); lm_.lock (); ctx_.sched.activate (false /* external */); diff --git a/libbuild2/context.hxx b/libbuild2/context.hxx index ef628c9..0595413 100644 --- a/libbuild2/context.hxx +++ b/libbuild2/context.hxx @@ -43,6 +43,11 @@ namespace build2 bool relock (run_phase unlock, run_phase lock); + // Statistics. + // + public: + size_t contention = 0; // # of contentious phase (re)locks. + private: friend class context; @@ -61,7 +66,7 @@ namespace build2 // is exclusive so we have a separate mutex to serialize it (think of it // as a second level locking). // - // When the mutex is unlocked (all three counters become zero, the phase + // When the mutex is unlocked (all three counters become zero), the phase // is always changed to load (this is also the initial state). // context& ctx_; |