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task: add cancel method

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Add a method to have TaskMaster discard any entries in its queue, terminate
all worker threads, and prevent any new Tasks from being queued.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-12-09 00:52:38 -05:00
parent 389dd52cc1
commit 4e962172a7
2 changed files with 55 additions and 11 deletions
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16
include/crucible/task.h
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@ -55,27 +55,29 @@ namespace crucible {
class TaskMaster {
public:
// Blocks until the running thread count reaches this number
/// Blocks until the running thread count reaches this number
static void set_thread_count(size_t threads);
// Sets minimum thread count when load average tracking enabled
/// Sets minimum thread count when load average tracking enabled
static void set_thread_min_count(size_t min_threads);
// Calls set_thread_count with default
/// Calls set_thread_count with default
static void set_thread_count();
// Creates thread to track load average and adjust thread count dynamically
/// Creates thread to track load average and adjust thread count dynamically
static void set_loadavg_target(double target);
// Writes the current non-executing Task queue
/// Writes the current non-executing Task queue
static ostream & print_queue(ostream &);
// Writes the current executing Task for each worker
/// Writes the current executing Task for each worker
static ostream & print_workers(ostream &);
// Gets the current number of queued Tasks
/// Gets the current number of queued Tasks
static size_t get_queue_count();
/// Forcibly drop the queue and stop accepting new entries
static void cancel();
};
// Barrier executes waiting Tasks once the last BarrierLock