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https://github.com/holub/mame
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transformed to std::atomic (nw)
This commit is contained in:
Miodrag Milanovic
parent
4380724fb5
commit
0b4723c8cc
@ -19,6 +19,7 @@
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#endif
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#endif
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#include <mutex>
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#include <atomic>
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// MAME headers
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#include "osdcore.h"
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@ -56,7 +57,7 @@ typedef void *PVOID;
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//============================================================
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#if KEEP_STATISTICS
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#define add_to_stat(v,x) do { atomic_add32((v), (x)); } while (0)
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#define add_to_stat(v,x) do { (v) += (x); } while (0)
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#define begin_timing(v) do { (v) -= get_profile_ticks(); } while (0)
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#define end_timing(v) do { (v) += get_profile_ticks(); } while (0)
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#else
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@ -65,8 +66,8 @@ typedef void *PVOID;
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#define end_timing(v) do { } while (0)
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#endif
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template<typename _PtrType>
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static void spin_while(const volatile _PtrType * volatile ptr, const _PtrType val, const osd_ticks_t timeout, const int invert = 0)
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template<typename _AtomType, typename _MainType>
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static void spin_while(const volatile _AtomType * volatile atom, const _MainType val, const osd_ticks_t timeout, const int invert = 0)
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{
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osd_ticks_t stopspin = osd_ticks() + timeout;
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@ -74,16 +75,16 @@ static void spin_while(const volatile _PtrType * volatile ptr, const _PtrType va
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int spin = 10000;
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while (--spin)
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{
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if ((*ptr != val) ^ invert)
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if ((*atom != val) ^ invert)
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return;
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}
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} while (((*ptr == val) ^ invert) && osd_ticks() < stopspin);
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} while (((*atom == val) ^ invert) && osd_ticks() < stopspin);
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}
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template<typename _PtrType>
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static void spin_while_not(const volatile _PtrType * volatile ptr, const _PtrType val, const osd_ticks_t timeout)
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template<typename _AtomType, typename _MainType>
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static void spin_while_not(const volatile _AtomType * volatile atom, const _MainType val, const osd_ticks_t timeout)
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{
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spin_while(ptr, val, timeout, 1);
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spin_while<_AtomType, _MainType>(atom, val, timeout, 1);
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}
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@ -96,7 +97,7 @@ struct work_thread_info
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osd_work_queue * queue; // pointer back to the queue
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osd_thread * handle; // handle to the thread
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osd_event * wakeevent; // wake event for the thread
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volatile INT32 active; // are we actively processing work?
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std::atomic<INT32> active; // are we actively processing work?
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#if KEEP_STATISTICS
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INT32 itemsdone;
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@ -110,24 +111,24 @@ struct work_thread_info
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struct osd_work_queue
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{
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std::mutex *lock; // lock for protecting the queue
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osd_work_item * volatile list; // list of items in the queue
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std::mutex *lock; // lock for protecting the queue
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std::atomic<osd_work_item *> list; // list of items in the queue
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osd_work_item ** volatile tailptr; // pointer to the tail pointer of work items in the queue
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osd_work_item * volatile free; // free list of work items
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volatile INT32 items; // items in the queue
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volatile INT32 livethreads; // number of live threads
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volatile INT32 waiting; // is someone waiting on the queue to complete?
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volatile INT32 exiting; // should the threads exit on their next opportunity?
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std::atomic<osd_work_item *> free; // free list of work items
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std::atomic<INT32> items; // items in the queue
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std::atomic<INT32> livethreads; // number of live threads
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std::atomic<INT32> waiting; // is someone waiting on the queue to complete?
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std::atomic<INT32> exiting; // should the threads exit on their next opportunity?
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UINT32 threads; // number of threads in this queue
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UINT32 flags; // creation flags
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work_thread_info * thread; // array of thread information
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osd_event * doneevent; // event signalled when work is complete
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#if KEEP_STATISTICS
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volatile INT32 itemsqueued; // total items queued
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volatile INT32 setevents; // number of times we called SetEvent
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volatile INT32 extraitems; // how many extra items we got after the first in the queue loop
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volatile INT32 spinloops; // how many times spinning bought us more items
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std::atomic<INT32> itemsqueued; // total items queued
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std::atomic<INT32> setevents; // number of times we called SetEvent
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std::atomic<INT32> extraitems; // how many extra items we got after the first in the queue loop
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std::atomic<INT32> spinloops; // how many times spinning bought us more items
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#endif
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};
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@ -141,7 +142,7 @@ struct osd_work_item
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void * result; // callback result
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osd_event * event; // event signalled when complete
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UINT32 flags; // creation flags
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volatile INT32 done; // is the item done?
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std::atomic<INT32> done; // is the item done?
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};
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//============================================================
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@ -301,7 +302,7 @@ int osd_work_queue_wait(osd_work_queue *queue, osd_ticks_t timeout)
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{
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// spin until we're done
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begin_timing(thread->spintime);
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spin_while_not(&queue->items, 0, timeout);
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spin_while_not<std::atomic<int>,int>(&queue->items, 0, timeout);
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end_timing(thread->spintime);
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begin_timing(thread->waittime);
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@ -312,10 +313,10 @@ int osd_work_queue_wait(osd_work_queue *queue, osd_ticks_t timeout)
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// reset our done event and double-check the items before waiting
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osd_event_reset(queue->doneevent);
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atomic_exchange32(&queue->waiting, TRUE);
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queue->waiting = TRUE;
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if (queue->items != 0)
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osd_event_wait(queue->doneevent, timeout);
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atomic_exchange32(&queue->waiting, FALSE);
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queue->waiting = FALSE;
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// return TRUE if we actually hit 0
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return (queue->items == 0);
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@ -340,7 +341,7 @@ void osd_work_queue_free(osd_work_queue *queue)
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}
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// signal all the threads to exit
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atomic_exchange32(&queue->exiting, TRUE);
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queue->exiting = TRUE;
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for (threadnum = 0; threadnum < queue->threads; threadnum++)
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{
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work_thread_info *thread = &queue->thread[threadnum];
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@ -396,7 +397,7 @@ void osd_work_queue_free(osd_work_queue *queue)
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osd_event_free(queue->doneevent);
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// free all items in the free list
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while (queue->free != NULL)
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while (queue->free.load() != nullptr)
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{
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osd_work_item *item = (osd_work_item *)queue->free;
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queue->free = item->next;
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@ -406,7 +407,7 @@ void osd_work_queue_free(osd_work_queue *queue)
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}
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// free all items in the active list
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while (queue->list != NULL)
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while (queue->list.load() != nullptr)
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{
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osd_work_item *item = (osd_work_item *)queue->list;
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queue->list = item->next;
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@ -449,7 +450,7 @@ osd_work_item *osd_work_item_queue_multiple(osd_work_queue *queue, osd_work_call
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do
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{
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item = (osd_work_item *)queue->free;
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} while (item != NULL && compare_exchange_ptr((PVOID volatile *)&queue->free, item, item->next) != item);
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} while (item != NULL && !queue->free.compare_exchange_weak(item, item->next, std::memory_order_release, std::memory_order_relaxed));
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queue->lock->unlock();
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}
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@ -466,7 +467,7 @@ osd_work_item *osd_work_item_queue_multiple(osd_work_queue *queue, osd_work_call
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}
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else
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{
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atomic_exchange32(&item->done, FALSE); // needs to be set this way to prevent data race/usage of uninitialized memory on Linux
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item->done = FALSE; // needs to be set this way to prevent data race/usage of uninitialized memory on Linux
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}
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// fill in the basics
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@ -492,8 +493,8 @@ osd_work_item *osd_work_item_queue_multiple(osd_work_queue *queue, osd_work_call
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}
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// increment the number of items in the queue
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atomic_add32(&queue->items, numitems);
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add_to_stat(&queue->itemsqueued, numitems);
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queue->items += numitems;
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add_to_stat(queue->itemsqueued, numitems);
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// look for free threads to do the work
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if (queue->livethreads < queue->threads)
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@ -509,7 +510,7 @@ osd_work_item *osd_work_item_queue_multiple(osd_work_queue *queue, osd_work_call
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if (!thread->active)
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{
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osd_event_set(thread->wakeevent);
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add_to_stat(&queue->setevents, 1);
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add_to_stat(queue->setevents, 1);
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// for non-shared, the first one we find is good enough
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if (--numitems == 0)
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@ -554,7 +555,7 @@ int osd_work_item_wait(osd_work_item *item, osd_ticks_t timeout)
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if (item->event == NULL)
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{
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// TODO: do we need to measure the spin time here as well? and how can we do it?
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spin_while(&item->done, 0, timeout);
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spin_while<std::atomic<int>,int>(&item->done, 0, timeout);
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}
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// otherwise, block on the event until done
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@ -593,7 +594,7 @@ void osd_work_item_release(osd_work_item *item)
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{
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next = (osd_work_item *)item->queue->free;
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item->next = next;
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} while (compare_exchange_ptr((PVOID volatile *)&item->queue->free, next, item) != next);
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} while (!item->queue->free.compare_exchange_weak(next, item, std::memory_order_release, std::memory_order_relaxed));
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item->queue->lock->unlock();
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}
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@ -659,8 +660,8 @@ static void *worker_thread_entry(void *param)
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break;
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// indicate that we are live
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atomic_exchange32(&thread->active, TRUE);
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atomic_increment32(&queue->livethreads);
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thread->active = TRUE;
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++queue->livethreads;
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// process work items
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for ( ;; )
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@ -669,23 +670,23 @@ static void *worker_thread_entry(void *param)
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worker_thread_process(queue, thread);
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// if we're a high frequency queue, spin for a while before giving up
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if (queue->flags & WORK_QUEUE_FLAG_HIGH_FREQ && queue->list == NULL)
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if (queue->flags & WORK_QUEUE_FLAG_HIGH_FREQ && queue->list.load() == nullptr)
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{
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// spin for a while looking for more work
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begin_timing(thread->spintime);
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spin_while(&queue->list, (osd_work_item *)NULL, SPIN_LOOP_TIME);
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spin_while<std::atomic<osd_work_item *>, osd_work_item *>(&queue->list, (osd_work_item *)nullptr, SPIN_LOOP_TIME);
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end_timing(thread->spintime);
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}
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// if nothing more, release the processor
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if (!queue_has_list_items(queue))
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break;
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add_to_stat(&queue->spinloops, 1);
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add_to_stat(queue->spinloops, 1);
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}
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// decrement the live thread count
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atomic_exchange32(&thread->active, FALSE);
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atomic_decrement32(&queue->livethreads);
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thread->active = FALSE;
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--queue->livethreads;
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}
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#if defined(SDLMAME_MACOSX)
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@ -716,7 +717,7 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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// use a critical section to synchronize the removal of items
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{
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queue->lock->lock();
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if (queue->list == NULL)
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if (queue->list.load() == nullptr)
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{
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end_loop = true;
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}
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@ -727,7 +728,7 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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if (item != NULL)
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{
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queue->list = item->next;
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if (queue->list == NULL)
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if (queue->list.load() == nullptr)
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queue->tailptr = (osd_work_item **)&queue->list;
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}
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}
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@ -746,9 +747,9 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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end_timing(thread->actruntime);
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// decrement the item count after we are done
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atomic_decrement32(&queue->items);
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atomic_exchange32(&item->done, TRUE);
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add_to_stat(&thread->itemsdone, 1);
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--queue->items;
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item->done = TRUE;
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add_to_stat(thread->itemsdone, 1);
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// if it's an auto-release item, release it
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if (item->flags & WORK_ITEM_FLAG_AUTO_RELEASE)
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@ -761,14 +762,14 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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if (item->event != NULL)
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{
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osd_event_set(item->event);
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add_to_stat(&item->queue->setevents, 1);
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add_to_stat(item->queue->setevents, 1);
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}
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queue->lock->unlock();
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}
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// if we removed an item and there's still work to do, bump the stats
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if (queue_has_list_items(queue))
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add_to_stat(&queue->extraitems, 1);
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add_to_stat(queue->extraitems, 1);
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}
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}
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@ -776,7 +777,7 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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if (queue->waiting)
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{
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osd_event_set(queue->doneevent);
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add_to_stat(&queue->setevents, 1);
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add_to_stat(queue->setevents, 1);
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}
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end_timing(thread->runtime);
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@ -785,7 +786,7 @@ static void worker_thread_process(osd_work_queue *queue, work_thread_info *threa
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bool queue_has_list_items(osd_work_queue *queue)
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{
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queue->lock->lock();
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bool has_list_items = (queue->list != NULL);
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bool has_list_items = (queue->list.load() != nullptr);
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queue->lock->unlock();
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return has_list_items;
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}
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