122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
#include "MessageLoop.h"
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#include <assert.h>
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lifo_t nu::MessageLoop::message_cache = {0,};
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lifo_t nu::MessageLoop::cache_bases= {0,};
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#define MESSAAGE_CACHE_SEED 64
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typedef uint8_t message_data_t[64]; // ensure all messages are this size
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nu::MessageLoop::MessageLoop()
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{
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mpscq_init(&message_queue);
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message_notification = CreateEvent(0, FALSE, FALSE, 0);
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}
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nu::MessageLoop::~MessageLoop()
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{
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CloseHandle(message_notification);
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}
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void nu::MessageLoop::RefillCache()
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{
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message_data_t *cache_seed = (message_data_t *)_aligned_malloc(MESSAAGE_CACHE_SEED*sizeof(message_data_t), 64);
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if (cache_seed)
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{
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int i=MESSAAGE_CACHE_SEED;
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while (--i)
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{
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lifo_push(&message_cache, (queue_node_t *)&cache_seed[i]);
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}
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lifo_push(&cache_bases, (queue_node_t *)cache_seed);
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}
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else
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{
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Sleep(0); // yield and hope that someone else pops something off soon
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}
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}
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nu::message_node_t *nu::MessageLoop::AllocateMessage()
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{
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message_node_t *apc = 0;
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do
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{
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apc = (message_node_t *)lifo_pop(&message_cache);
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if (!apc)
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RefillCache();
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} while (!apc);
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return apc;
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}
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void nu::MessageLoop::PostMessage(nu::message_node_t *message)
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{
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if (mpscq_push(&message_queue, message) == 0)
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SetEvent(message_notification);
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}
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void nu::MessageLoop::FreeMessage(nu::message_node_t *message)
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{
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lifo_push(&message_cache, message);
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}
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nu::message_node_t *nu::MessageLoop::GetMessage()
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{
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message_node_t *message = PeekMessage();
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if (message)
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{
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return message;
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}
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while (WaitForSingleObject(message_notification, INFINITE) == WAIT_OBJECT_0)
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{
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message = PeekMessage();
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if (message)
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{
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return message;
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}
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}
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return 0;
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}
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nu::message_node_t *nu::MessageLoop::PeekMessage()
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{
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for (;;) // loop because we need to handle 'busy' from the queue
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{
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message_node_t *message = (message_node_t *)mpscq_pop(&message_queue);
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if (message == (message_node_t *)1) /* special return value that indicates a busy list */
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{
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// benski> although it's tempting to return 0 here, doing so will mess up the Event logic
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Sleep(0); // yield so that the thread that got pre-empted during push can finish
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}
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else
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{
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if (message)
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{
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return message;
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}
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else
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{
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return 0;
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}
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}
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}
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}
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nu::message_node_t *nu::MessageLoop::PeekMessage(unsigned int milliseconds)
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{
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message_node_t *message = PeekMessage();
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if (message)
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return message;
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if (WaitForSingleObject(message_notification, milliseconds) == WAIT_OBJECT_0)
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{
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message = PeekMessage();
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if (message)
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return message;
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}
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return 0;
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}
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