diff options
Diffstat (limited to 'gdbsupport')
| -rw-r--r-- | gdbsupport/parallel-for.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gdbsupport/parallel-for.h b/gdbsupport/parallel-for.h index b565676a0d0..de9ebb15746 100644 --- a/gdbsupport/parallel-for.h +++ b/gdbsupport/parallel-for.h @@ -70,6 +70,12 @@ public: return result; } + /* Resize the results to N. */ + void resize (size_t n) + { + m_futures.resize (n); + } + private: /* A vector of futures coming from the tasks run in the @@ -108,6 +114,12 @@ public: } } + /* Resize the results to N. */ + void resize (size_t n) + { + m_futures.resize (n); + } + private: std::vector<gdb::future<void>> m_futures; @@ -232,6 +244,24 @@ parallel_for_each (unsigned n, RandomIt first, RandomIt last, end = j; remaining_size -= chunk_size; } + + /* This case means we don't have enough elements to really + distribute them. Rather than ever submit a task that does + nothing, we short-circuit here. */ + if (first == end) + end = last; + + if (end == last) + { + /* We're about to dispatch the last batch of elements, which + we normally process in the main thread. So just truncate + the result list here. This avoids submitting empty tasks + to the thread pool. */ + count = i; + results.resize (count); + break; + } + if (parallel_for_each_debug) { debug_printf (_("Parallel for: elements on worker thread %i\t: %zu"), |