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// File: lzham_task_pool_win32.cpp
// See Copyright Notice and license at the end of include/lzham.h
#include "lzham_core.h"
#include "lzham_win32_threading.h"
#include "lzham_timer.h"
#include <process.h>
#if LZHAM_USE_WIN32_API
namespace lzham {
task_pool::task_pool()
: m_num_threads(0),
m_tasks_available(0, 32767),
m_num_outstanding_tasks(0),
m_exit_flag(false) {
utils::zero_object(m_threads);
}
task_pool::task_pool(uint num_threads)
: m_num_threads(0),
m_tasks_available(0, 32767),
m_num_outstanding_tasks(0),
m_exit_flag(false) {
utils::zero_object(m_threads);
bool status = init(num_threads);
LZHAM_VERIFY(status);
}
task_pool::~task_pool() {
deinit();
}
bool task_pool::init(uint num_threads) {
LZHAM_ASSERT(num_threads <= cMaxThreads);
num_threads = math::minimum<uint>(num_threads, cMaxThreads);
deinit();
bool succeeded = true;
m_num_threads = 0;
while (m_num_threads < num_threads) {
m_threads[m_num_threads] = (HANDLE)_beginthreadex(NULL, 32768, thread_func, this, 0, NULL);
LZHAM_ASSERT(m_threads[m_num_threads] != 0);
if (!m_threads[m_num_threads]) {
succeeded = false;
break;
}
m_num_threads++;
}
if (!succeeded) {
deinit();
return false;
}
return true;
}
void task_pool::deinit() {
if (m_num_threads) {
join();
atomic_exchange32(&m_exit_flag, true);
m_tasks_available.release(m_num_threads);
for (uint i = 0; i < m_num_threads; i++) {
if (m_threads[i]) {
for (;;) {
DWORD result = WaitForSingleObject(m_threads[i], 30000);
if ((result == WAIT_OBJECT_0) || (result == WAIT_ABANDONED))
break;
}
CloseHandle(m_threads[i]);
m_threads[i] = NULL;
}
}
m_num_threads = 0;
atomic_exchange32(&m_exit_flag, false);
}
m_task_stack.clear();
m_num_outstanding_tasks = 0;
}
bool task_pool::queue_task(task_callback_func pFunc, uint64 data, void* pData_ptr) {
LZHAM_ASSERT(m_num_threads);
LZHAM_ASSERT(pFunc);
task tsk;
tsk.m_callback = pFunc;
tsk.m_data = data;
tsk.m_pData_ptr = pData_ptr;
tsk.m_flags = 0;
if (!m_task_stack.try_push(tsk))
return false;
atomic_increment32(&m_num_outstanding_tasks);
m_tasks_available.release(1);
return true;
}
// It's the object's responsibility to delete pObj within the execute_task() method, if needed!
bool task_pool::queue_task(executable_task* pObj, uint64 data, void* pData_ptr) {
LZHAM_ASSERT(m_num_threads);
LZHAM_ASSERT(pObj);
task tsk;
tsk.m_pObj = pObj;
tsk.m_data = data;
tsk.m_pData_ptr = pData_ptr;
tsk.m_flags = cTaskFlagObject;
if (!m_task_stack.try_push(tsk))
return false;
atomic_increment32(&m_num_outstanding_tasks);
m_tasks_available.release(1);
return true;
}
void task_pool::process_task(task& tsk) {
if (tsk.m_flags & cTaskFlagObject)
tsk.m_pObj->execute_task(tsk.m_data, tsk.m_pData_ptr);
else
tsk.m_callback(tsk.m_data, tsk.m_pData_ptr);
atomic_decrement32(&m_num_outstanding_tasks);
}
void task_pool::join() {
while (atomic_add32(&m_num_outstanding_tasks, 0) > 0) {
task tsk;
if (m_task_stack.pop(tsk)) {
process_task(tsk);
} else {
lzham_sleep(1);
}
}
}
unsigned __stdcall task_pool::thread_func(void* pContext) {
task_pool* pPool = static_cast<task_pool*>(pContext);
for (;;) {
if (!pPool->m_tasks_available.wait())
break;
if (pPool->m_exit_flag)
break;
task tsk;
if (pPool->m_task_stack.pop(tsk)) {
pPool->process_task(tsk);
}
}
_endthreadex(0);
return 0;
}
static uint g_num_processors;
uint lzham_get_max_helper_threads() {
if (!g_num_processors) {
SYSTEM_INFO system_info;
GetSystemInfo(&system_info);
g_num_processors = system_info.dwNumberOfProcessors;
}
if (g_num_processors > 1) {
// use all CPU's
return LZHAM_MIN(task_pool::cMaxThreads, g_num_processors - 1);
}
return 0;
}
} // namespace lzham
#endif // LZHAM_USE_WIN32_API
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