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| author | Boris Kolpackov <boris@codesynthesis.com> | 2024-05-09 11:56:11 +0200 |
|---|---|---|
| committer | Boris Kolpackov <boris@codesynthesis.com> | 2024-05-09 11:56:11 +0200 |
| commit | c54e434be71e3cb8e71436cd7397bc4ab9957a7f (patch) | |
| tree | c9d4bc755011e1b5d05f7036d9197037ea63ac23 /libbuild2 | |
| parent | 2f191a6c6cf1c7802c31fc73e01c5bac17a7f4f1 (diff) | |
Try to improve deadlock detection accuracy (GH issue 319)
Diffstat (limited to 'libbuild2')
| -rw-r--r-- | libbuild2/scheduler.cxx | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/libbuild2/scheduler.cxx b/libbuild2/scheduler.cxx index e3fbcc1..69673e6 100644 --- a/libbuild2/scheduler.cxx +++ b/libbuild2/scheduler.cxx @@ -97,6 +97,10 @@ namespace build2 { // Note: assume non-serial execution. + // Note: increment progress before/after every wait. + // + progress_.fetch_add (1, memory_order_relaxed); + lock l (move (rl)); // Make sure unlocked on exception. active_--; @@ -135,6 +139,10 @@ namespace build2 { // Note: assume non-serial execution. + // Note: increment progress before/after every wait. + // + progress_.fetch_add (1, memory_order_relaxed); + lock l (mutex_); if (collision) @@ -1053,7 +1061,9 @@ namespace build2 // Re-check active/external counts for good measure (in case we were // spinning too fast). // - if (np == op && s.active_ == 0 && s.external_ == 0 && !s.shutdown_) + if (np == op && + s.active_ == 0 && s.external_ == 0 && !s.shutdown_ && + s.progress_.load (memory_order_consume) == op) { // Shutting things down cleanly is tricky: we could have handled it // in the scheduler (e.g., by setting a flag and then waking |