This patch allows subsystems to create their own private queues with associated pools of threads.
Signed-off-by: Arun R Bharadwaj <a...@linux.vnet.ibm.com> --- qemu-threadlets.c | 75 ++++++++++++++++++++++++++++++++++++++--------------- qemu-threadlets.h | 4 +++ 2 files changed, 58 insertions(+), 21 deletions(-) diff --git a/qemu-threadlets.c b/qemu-threadlets.c index 42dd3d1..4df79b8 100644 --- a/qemu-threadlets.c +++ b/qemu-threadlets.c @@ -99,6 +99,25 @@ static void spawn_threadlet(ThreadletQueue *queue) } /** + * submit_work_to_queue: Submit a new task to a private queue to be + * executed asynchronously. + * @queue: Per-subsystem private queue to which the new task needs + * to be submitted. + * @work: Contains information about the task that needs to be submitted. + */ +void submit_work_to_queue(ThreadletQueue *queue, ThreadletWork *work) +{ + qemu_mutex_lock(&queue->lock); + if (queue->idle_threads == 0 && queue->cur_threads < queue->max_threads) { + spawn_threadlet(queue); + } else { + qemu_cond_signal(&queue->cond); + } + QTAILQ_INSERT_TAIL(&queue->request_list, work, node); + qemu_mutex_unlock(&queue->lock); +} + +/** * submit_work: Submit to the global queue a new task to be executed * asynchronously. * @work: Contains information about the task that needs to be submitted. @@ -106,26 +125,26 @@ static void spawn_threadlet(ThreadletQueue *queue) void submit_work(ThreadletWork *work) { if (!globalqueue_init) { - globalqueue.cur_threads = 0; - globalqueue.idle_threads = 0; - globalqueue.max_threads = MAX_GLOBAL_THREADS; - globalqueue.min_threads = MIN_GLOBAL_THREADS; - QTAILQ_INIT(&globalqueue.request_list); - qemu_mutex_init(&globalqueue.lock); - qemu_cond_init(&globalqueue.cond); - + threadlet_queue_init(&globalqueue, MAX_GLOBAL_THREADS, + MIN_GLOBAL_THREADS); globalqueue_init = 1; } - qemu_mutex_lock(&globalqueue.lock); - if (globalqueue.idle_threads == 0 && - globalqueue.cur_threads < globalqueue.max_threads) { - spawn_threadlet(&globalqueue); - } else { - qemu_cond_signal(&globalqueue.cond); - } - QTAILQ_INSERT_TAIL(&globalqueue.request_list, work, node); - qemu_mutex_unlock(&globalqueue.lock); + submit_work_to_queue(&globalqueue, work); +} + +/** + * dequeue_work_on_queue: Cancel a task queued on a Queue. + * @queue: The queue containing the task to be cancelled. + * @work: Contains the information of the task that needs to be cancelled. + */ +int dequeue_work_on_queue(ThreadletQueue *queue, ThreadletWork *work) +{ + qemu_mutex_lock(&queue->lock); + QTAILQ_REMOVE(&queue->request_list, work, node); + qemu_mutex_unlock(&queue->lock); + + return 0; } /** @@ -134,9 +153,23 @@ void submit_work(ThreadletWork *work) */ int dequeue_work(ThreadletWork *work) { - qemu_mutex_lock(&globalqueue.lock); - QTAILQ_REMOVE(&globalqueue.request_list, work, node); - qemu_mutex_unlock(&globalqueue.lock); + return dequeue_work_on_queue(&globalqueue, work); +} - return 0; +/** + * threadlet_queue_init: Initialize a threadlet queue. + * @queue: The threadlet queue to be initialized. + * @max_threads: Maximum number of threads processing the queue. + * @min_threads: Minimum number of threads processing the queue. + */ +void threadlet_queue_init(ThreadletQueue *queue, + int max_threads, int min_threads) +{ + queue->cur_threads = 0; + queue->idle_threads = 0; + queue->max_threads = max_threads; + queue->min_threads = min_threads; + QTAILQ_INIT(&queue->request_list); + qemu_mutex_init(&queue->lock); + qemu_cond_init(&queue->cond); } diff --git a/qemu-threadlets.h b/qemu-threadlets.h index 03bb86b..993d7ab 100644 --- a/qemu-threadlets.h +++ b/qemu-threadlets.h @@ -37,7 +37,11 @@ typedef struct ThreadletWork void (*func)(struct ThreadletWork *work); } ThreadletWork; +void submit_work_to_queue(ThreadletQueue *queue, ThreadletWork *work); void submit_work(ThreadletWork *work); +int dequeue_work_on_queue(ThreadletQueue *queue, ThreadletWork *work); int dequeue_work(ThreadletWork *work); void threadlet_init(void); +void threadlet_queue_init(ThreadletQueue *queue, int max_threads, + int min_threads); #endif