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opencv/modules/core/src/parallel_impl.cpp

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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "precomp.hpp"
#include "parallel_impl.hpp"
#ifdef HAVE_PTHREADS_PF
#include <pthread.h>
#include <opencv2/core/utils/configuration.private.hpp>
#include <opencv2/core/utils/logger.defines.hpp>
//#undef CV_LOG_STRIP_LEVEL
//#define CV_LOG_STRIP_LEVEL CV_LOG_LEVEL_VERBOSE + 1
#include <opencv2/core/utils/logger.hpp>
#include <opencv2/core/utils/trace.private.hpp>
//#define CV_PROFILE_THREADS 64
//#define getTickCount getCPUTickCount // use this if getTickCount() calls are expensive (and getCPUTickCount() is accurate)
//#define CV_USE_GLOBAL_WORKERS_COND_VAR // not effective on many-core systems (10+)
#include <atomic>
// Spin lock's OS-level yield
#ifdef DECLARE_CV_YIELD
DECLARE_CV_YIELD
#endif
#ifndef CV_YIELD
# include <thread>
# define CV_YIELD() std::this_thread::yield()
#endif // CV_YIELD
// Spin lock's CPU-level yield (required for Hyper-Threading)
#ifdef DECLARE_CV_PAUSE
DECLARE_CV_PAUSE
#endif
#ifndef CV_PAUSE
# if defined __GNUC__ && (defined __i386__ || defined __x86_64__)
# if !defined(__SSE2__)
static inline void cv_non_sse_mm_pause() { __asm__ __volatile__ ("rep; nop"); }
# define _mm_pause cv_non_sse_mm_pause
# endif
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { _mm_pause(); } } while (0)
# elif defined __GNUC__ && defined __aarch64__
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("yield" ::: "memory"); } } while (0)
# elif defined __GNUC__ && defined __arm__
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("" ::: "memory"); } } while (0)
# elif defined __GNUC__ && defined __mips__ && __mips_isa_rev >= 2
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("pause" ::: "memory"); } } while (0)
# elif defined __GNUC__ && defined __PPC64__
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("or 27,27,27" ::: "memory"); } } while (0)
# elif defined __GNUC__ && defined __riscv
// PAUSE HINT is not part of RISC-V ISA yet, but is under discussion now. For details see:
// https://github.com/riscv/riscv-isa-manual/pull/398
// https://github.com/riscv/riscv-isa-manual/issues/43
// # define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("pause"); } } while (0)
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("nop"); } } while (0)
# else
# warning "Can't detect 'pause' (CPU-yield) instruction on the target platform. Specify CV_PAUSE() definition via compiler flags."
# define CV_PAUSE(...) do { /* no-op: works, but not effective */ } while (0)
# endif
#endif // CV_PAUSE
namespace cv
{
static int CV_ACTIVE_WAIT_PAUSE_LIMIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_PAUSE_LIMIT", 16); // iterations
static int CV_WORKER_ACTIVE_WAIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_WORKER", 2000); // iterations
static int CV_MAIN_THREAD_ACTIVE_WAIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_MAIN", 10000); // iterations
static int CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT = (int)utils::getConfigurationParameterSizeT("OPENCV_THREAD_POOL_ACTIVE_WAIT_THREADS_LIMIT", 0); // number of real cores
class WorkerThread;
class ParallelJob;
class ThreadPool
{
public:
static ThreadPool& instance()
{
CV_SINGLETON_LAZY_INIT_REF(ThreadPool, new ThreadPool())
}
static void stop()
{
ThreadPool& manager = instance();
manager.reconfigure(0);
}
void reconfigure(unsigned new_threads_count)
{
if (new_threads_count == threads.size())
return;
pthread_mutex_lock(&mutex);
reconfigure_(new_threads_count);
pthread_mutex_unlock(&mutex);
}
bool reconfigure_(unsigned new_threads_count); // internal implementation
void run(const Range& range, const ParallelLoopBody& body, double nstripes);
size_t getNumOfThreads();
void setNumOfThreads(unsigned n);
ThreadPool();
~ThreadPool();
unsigned num_threads;
pthread_mutex_t mutex; // guards fields (job/threads) from non-worker threads (concurrent parallel_for calls)
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_t cond_thread_wake;
#endif
pthread_mutex_t mutex_notify;
pthread_cond_t cond_thread_task_complete;
std::vector< Ptr<WorkerThread> > threads;
Ptr<ParallelJob> job;
#ifdef CV_PROFILE_THREADS
double tickFreq;
int64 jobSubmitTime;
struct ThreadStatistics
{
ThreadStatistics() : threadWait(0)
{
reset();
}
void reset()
{
threadWake = 0;
threadExecuteStart = 0;
threadExecuteStop = 0;
executedTasks = 0;
keepActive = false;
threadPing = getTickCount();
}
int64 threadWait; // don't reset by default
int64 threadPing; // don't reset by default
int64 threadWake;
int64 threadExecuteStart;
int64 threadExecuteStop;
int64 threadFree;
unsigned executedTasks;
bool keepActive;
int64 dummy_[8]; // separate cache lines
void dump(int id, int64 baseTime, double tickFreq)
{
if (id < 0)
std::cout << "Main: ";
else
printf("T%03d: ", id + 2);
printf("wait=% 10.1f ping=% 6.1f",
threadWait > 0 ? (threadWait - baseTime) / tickFreq * 1e6 : -0.0,
threadPing > 0 ? (threadPing - baseTime) / tickFreq * 1e6 : -0.0);
if (threadWake > 0)
printf(" wake=% 6.1f",
(threadWake > 0 ? (threadWake - baseTime) / tickFreq * 1e6 : -0.0));
if (threadExecuteStart > 0)
{
printf(" exec=% 6.1f - % 6.1f tasksDone=%5u free=% 6.1f",
(threadExecuteStart > 0 ? (threadExecuteStart - baseTime) / tickFreq * 1e6 : -0.0),
(threadExecuteStop > 0 ? (threadExecuteStop - baseTime) / tickFreq * 1e6 : -0.0),
executedTasks,
(threadFree > 0 ? (threadFree - baseTime) / tickFreq * 1e6 : -0.0));
if (id >= 0)
printf(" active=%s\n", keepActive ? "true" : "false");
else
printf("\n");
}
else
printf(" ------------------------------------------------------------------------------\n");
}
};
ThreadStatistics threads_stat[CV_PROFILE_THREADS]; // 0 - main thread, 1..N - worker threads
#endif
};
class WorkerThread
{
public:
ThreadPool& thread_pool;
const unsigned id;
pthread_t posix_thread;
bool is_created;
std::atomic<bool> stop_thread;
std::atomic<bool> has_wake_signal;
Ptr<ParallelJob> job;
pthread_mutex_t mutex;
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
volatile bool isActive;
pthread_cond_t cond_thread_wake;
#endif
WorkerThread(ThreadPool& thread_pool_, unsigned id_) :
thread_pool(thread_pool_),
id(id_),
posix_thread(0),
is_created(false),
stop_thread(false),
has_wake_signal(false)
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
, isActive(true)
#endif
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: initializing new worker: " << id);
int res = pthread_mutex_init(&mutex, NULL);
if (res != 0)
{
CV_LOG_ERROR(NULL, id << ": Can't create thread mutex: res = " << res);
return;
}
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
res = pthread_cond_init(&cond_thread_wake, NULL);
if (res != 0)
{
CV_LOG_ERROR(NULL, id << ": Can't create thread condition variable: res = " << res);
return;
}
#endif
res = pthread_create(&posix_thread, NULL, thread_loop_wrapper, (void*)this);
if (res != 0)
{
CV_LOG_ERROR(NULL, id << ": Can't spawn new thread: res = " << res);
}
else
{
is_created = true;
}
}
~WorkerThread()
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: destroy worker thread: " << id);
if (is_created)
{
if (!stop_thread)
{
pthread_mutex_lock(&mutex); // to avoid signal miss due pre-check
stop_thread = true;
pthread_mutex_unlock(&mutex);
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_broadcast(&thread_pool.cond_thread_wake);
#else
pthread_cond_signal(&cond_thread_wake);
#endif
}
pthread_join(posix_thread, NULL);
}
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_destroy(&cond_thread_wake);
#endif
pthread_mutex_destroy(&mutex);
}
void thread_body();
static void* thread_loop_wrapper(void* thread_object)
{
#ifdef OPENCV_WITH_ITT
__itt_thread_set_name(cv::format("OpenCVThread-%03d", cv::utils::getThreadID()).c_str());
#endif
((WorkerThread*)thread_object)->thread_body();
return 0;
}
};
class ParallelJob
{
public:
ParallelJob(const ThreadPool& thread_pool_, const Range& range_, const ParallelLoopBody& body_, int nstripes_) :
thread_pool(thread_pool_),
body(body_),
range(range_),
nstripes((unsigned)nstripes_),
is_completed(false)
{
CV_LOG_VERBOSE(NULL, 5, "ParallelJob::ParallelJob(" << (void*)this << ")");
current_task.store(0, std::memory_order_relaxed);
active_thread_count.store(0, std::memory_order_relaxed);
completed_thread_count.store(0, std::memory_order_relaxed);
dummy0_[0] = 0, dummy1_[0] = 0, dummy2_[0] = 0; // compiler warning
}
~ParallelJob()
{
CV_LOG_VERBOSE(NULL, 5, "ParallelJob::~ParallelJob(" << (void*)this << ")");
}
unsigned execute(bool is_worker_thread)
{
unsigned executed_tasks = 0;
const int task_count = range.size();
const int remaining_multiplier = std::min(nstripes,
std::max(
std::min(100u, thread_pool.num_threads * 4),
thread_pool.num_threads * 2
)); // experimental value
for (;;)
{
int chunk_size = std::max(1, (task_count - current_task) / remaining_multiplier);
int id = current_task.fetch_add(chunk_size, std::memory_order_seq_cst);
if (id >= task_count)
break; // no more free tasks
executed_tasks += chunk_size;
int start_id = id;
int end_id = std::min(task_count, id + chunk_size);
CV_LOG_VERBOSE(NULL, 9, "Thread: job " << start_id << "-" << end_id);
//TODO: if (not pending exception)
{
body.operator()(Range(range.start + start_id, range.start + end_id));
}
if (is_worker_thread && is_completed)
{
CV_LOG_ERROR(NULL, "\t\t\t\tBUG! Job: " << (void*)this << " " << id << " " << active_thread_count << " " << completed_thread_count);
CV_Assert(!is_completed); // TODO Dbg this
}
}
return executed_tasks;
}
const ThreadPool& thread_pool;
const ParallelLoopBody& body;
const Range range;
const unsigned nstripes;
std::atomic<int> current_task; // next free part of job
int64 dummy0_[8]; // avoid cache-line reusing for the same atomics
std::atomic<int> active_thread_count; // number of threads worked on this job
int64 dummy1_[8]; // avoid cache-line reusing for the same atomics
std::atomic<int> completed_thread_count; // number of threads completed any activities on this job
int64 dummy2_[8]; // avoid cache-line reusing for the same atomics
std::atomic<bool> is_completed;
// TODO exception handling
};
// Disable thread sanitization check when CV_USE_GLOBAL_WORKERS_COND_VAR is not
// set because it triggers as the main thread reads isActive while the children
// thread writes it (but it all works out because a mutex is locked in the main
// thread and isActive re-checked).
// This is to solve issue #19463.
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR) && defined(__clang__) && defined(__has_feature)
#if __has_feature(thread_sanitizer)
__attribute__((no_sanitize("thread")))
#endif
#endif
void WorkerThread::thread_body()
{
(void)cv::utils::getThreadID(); // notify OpenCV about new thread
CV_LOG_VERBOSE(NULL, 5, "Thread: new thread: " << id);
bool allow_active_wait = true;
#ifdef CV_PROFILE_THREADS
ThreadPool::ThreadStatistics& stat = thread_pool.threads_stat[id + 1];
#endif
while (!stop_thread)
{
CV_LOG_VERBOSE(NULL, 5, "Thread: ... loop iteration: allow_active_wait=" << allow_active_wait << " has_wake_signal=" << has_wake_signal);
if (allow_active_wait && CV_WORKER_ACTIVE_WAIT > 0)
{
allow_active_wait = false;
for (int i = 0; i < CV_WORKER_ACTIVE_WAIT; i++)
{
if (has_wake_signal)
break;
if (CV_ACTIVE_WAIT_PAUSE_LIMIT > 0 && (i < CV_ACTIVE_WAIT_PAUSE_LIMIT || (i & 1)))
CV_PAUSE(16);
else
CV_YIELD();
}
}
pthread_mutex_lock(&mutex);
#ifdef CV_PROFILE_THREADS
stat.threadWait = getTickCount();
#endif
while (!has_wake_signal) // to handle spurious wakeups
{
//CV_LOG_VERBOSE(NULL, 5, "Thread: wait (sleep) ...");
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_wait(&thread_pool.cond_thread_wake, &mutex);
#else
isActive = false;
pthread_cond_wait(&cond_thread_wake, &mutex);
isActive = true;
#endif
CV_LOG_VERBOSE(NULL, 5, "Thread: wake ... (has_wake_signal=" << has_wake_signal << " stop_thread=" << stop_thread << ")")
}
#ifdef CV_PROFILE_THREADS
stat.threadWake = getTickCount();
#endif
CV_LOG_VERBOSE(NULL, 5, "Thread: checking for new job");
if (CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT == 0)
allow_active_wait = true;
Ptr<ParallelJob> j_ptr; swap(j_ptr, job);
has_wake_signal = false;
pthread_mutex_unlock(&mutex);
if (!stop_thread)
{
ParallelJob* j = j_ptr;
if (j)
{
CV_LOG_VERBOSE(NULL, 5, "Thread: job size=" << j->range.size() << " done=" << j->current_task);
if (j->current_task < j->range.size())
{
int other = j->active_thread_count.fetch_add(1, std::memory_order_seq_cst);
CV_LOG_VERBOSE(NULL, 5, "Thread: processing new job (with " << other << " other threads)"); CV_UNUSED(other);
#ifdef CV_PROFILE_THREADS
stat.threadExecuteStart = getTickCount();
stat.executedTasks = j->execute(true);
stat.threadExecuteStop = getTickCount();
#else
j->execute(true);
#endif
int completed = j->completed_thread_count.fetch_add(1, std::memory_order_seq_cst) + 1;
int active = j->active_thread_count.load(std::memory_order_acquire);
if (CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT > 0)
{
allow_active_wait = true;
if (active >= CV_WORKER_ACTIVE_WAIT_THREADS_LIMIT && (id & 1) == 0) // turn off a half of threads
allow_active_wait = false;
}
CV_LOG_VERBOSE(NULL, 5, "Thread: completed job processing: " << active << " " << completed);
if (active == completed)
{
bool need_signal = !j->is_completed;
j->is_completed = true;
j = NULL; j_ptr.release();
if (need_signal)
{
CV_LOG_VERBOSE(NULL, 5, "Thread: job finished => notifying the main thread");
pthread_mutex_lock(&thread_pool.mutex_notify); // to avoid signal miss due pre-check condition
// empty
pthread_mutex_unlock(&thread_pool.mutex_notify);
pthread_cond_broadcast/*pthread_cond_signal*/(&thread_pool.cond_thread_task_complete);
}
}
}
else
{
CV_LOG_VERBOSE(NULL, 5, "Thread: no free job tasks");
}
}
}
#ifdef CV_PROFILE_THREADS
stat.threadFree = getTickCount();
stat.keepActive = allow_active_wait;
#endif
}
}
ThreadPool::ThreadPool()
{
#ifdef CV_PROFILE_THREADS
tickFreq = getTickFrequency();
#endif
int res = 0;
res |= pthread_mutex_init(&mutex, NULL);
res |= pthread_mutex_init(&mutex_notify, NULL);
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
res |= pthread_cond_init(&cond_thread_wake, NULL);
#endif
res |= pthread_cond_init(&cond_thread_task_complete, NULL);
if (0 != res)
{
CV_LOG_FATAL(NULL, "Failed to initialize ThreadPool (pthreads)");
}
num_threads = defaultNumberOfThreads();
}
bool ThreadPool::reconfigure_(unsigned new_threads_count)
{
if (new_threads_count == threads.size())
return false;
if (new_threads_count < threads.size())
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: reduce worker pool: " << threads.size() << " => " << new_threads_count);
std::vector< Ptr<WorkerThread> > release_threads(threads.size() - new_threads_count);
for (size_t i = new_threads_count; i < threads.size(); ++i)
{
pthread_mutex_lock(&threads[i]->mutex); // to avoid signal miss due pre-check
threads[i]->stop_thread = true;
threads[i]->has_wake_signal = true;
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_mutex_unlock(&threads[i]->mutex);
pthread_cond_broadcast/*pthread_cond_signal*/(&threads[i]->cond_thread_wake); // wake thread
#else
pthread_mutex_unlock(&threads[i]->mutex);
#endif
std::swap(threads[i], release_threads[i - new_threads_count]);
}
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
CV_LOG_VERBOSE(NULL, 1, "MainThread: notify worker threads about termination...");
pthread_cond_broadcast(&cond_thread_wake); // wake all threads
#endif
threads.resize(new_threads_count);
release_threads.clear(); // calls thread_join which want to lock mutex
return false;
}
else
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: upgrade worker pool: " << threads.size() << " => " << new_threads_count);
for (size_t i = threads.size(); i < new_threads_count; ++i)
{
threads.push_back(Ptr<WorkerThread>(new WorkerThread(*this, (unsigned)i))); // spawn more threads
}
}
return false;
}
ThreadPool::~ThreadPool()
{
reconfigure(0);
pthread_cond_destroy(&cond_thread_task_complete);
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_destroy(&cond_thread_wake);
#endif
pthread_mutex_destroy(&mutex);
pthread_mutex_destroy(&mutex_notify);
}
void ThreadPool::run(const Range& range, const ParallelLoopBody& body, double nstripes)
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: new parallel job: num_threads=" << num_threads << " range=" << range.size() << " nstripes=" << nstripes << " job=" << (void*)job);
#ifdef CV_PROFILE_THREADS
jobSubmitTime = getTickCount();
threads_stat[0].reset();
threads_stat[0].threadWait = jobSubmitTime;
threads_stat[0].threadWake = jobSubmitTime;
#endif
if (getNumOfThreads() > 1 &&
job == NULL &&
(range.size() * nstripes >= 2 || (range.size() > 1 && nstripes <= 0))
)
{
pthread_mutex_lock(&mutex);
if (job != NULL)
{
pthread_mutex_unlock(&mutex);
body(range);
return;
}
reconfigure_(num_threads - 1);
{
CV_LOG_VERBOSE(NULL, 1, "MainThread: initialize parallel job: " << range.size());
job = Ptr<ParallelJob>(new ParallelJob(*this, range, body, nstripes));
pthread_mutex_unlock(&mutex);
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake worker threads...");
for (size_t i = 0; i < threads.size(); ++i)
{
WorkerThread& thread = *(threads[i].get());
if (
#if defined(__clang__) && defined(__has_feature)
#if __has_feature(thread_sanitizer)
1 || // Robust workaround to avoid data race warning of `thread.job`
#endif
#endif
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
thread.isActive ||
#endif
thread.has_wake_signal
|| !thread.job.empty() // #10881
)
{
pthread_mutex_lock(&thread.mutex);
thread.job = job;
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
bool isActive = thread.isActive;
#endif
thread.has_wake_signal = true;
#ifdef CV_PROFILE_THREADS
threads_stat[i + 1].reset();
#endif
pthread_mutex_unlock(&thread.mutex);
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
if (!isActive)
{
pthread_cond_broadcast/*pthread_cond_signal*/(&thread.cond_thread_wake); // wake thread
}
#endif
}
else
{
CV_Assert(thread.job.empty());
thread.job = job;
thread.has_wake_signal = true;
#ifdef CV_PROFILE_THREADS
threads_stat[i + 1].reset();
#endif
#if !defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_broadcast/*pthread_cond_signal*/(&thread.cond_thread_wake); // wake thread
#endif
}
}
#ifdef CV_PROFILE_THREADS
threads_stat[0].threadPing = getTickCount();
#endif
#if defined(CV_USE_GLOBAL_WORKERS_COND_VAR)
pthread_cond_broadcast(&cond_thread_wake); // wake all threads
#endif
#ifdef CV_PROFILE_THREADS
threads_stat[0].threadWake = getTickCount();
#endif
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake worker threads... (done)");
{
ParallelJob& j = *(this->job);
#ifdef CV_PROFILE_THREADS
threads_stat[0].threadExecuteStart = getTickCount();
threads_stat[0].executedTasks = j.execute(false);
threads_stat[0].threadExecuteStop = getTickCount();
#else
j.execute(false);
#endif
CV_Assert(j.current_task >= j.range.size());
CV_LOG_VERBOSE(NULL, 5, "MainThread: complete self-tasks: " << j.active_thread_count << " " << j.completed_thread_count);
if (job->is_completed || j.active_thread_count == 0)
{
job->is_completed = true;
CV_LOG_VERBOSE(NULL, 5, "MainThread: no WIP worker threads");
}
else
{
if (CV_MAIN_THREAD_ACTIVE_WAIT > 0)
{
for (int i = 0; i < CV_MAIN_THREAD_ACTIVE_WAIT; i++) // don't spin too much in any case (inaccurate getTickCount())
{
if (job->is_completed)
{
CV_LOG_VERBOSE(NULL, 5, "MainThread: job finalize (active wait) " << j.active_thread_count << " " << j.completed_thread_count);
break;
}
if (CV_ACTIVE_WAIT_PAUSE_LIMIT > 0 && (i < CV_ACTIVE_WAIT_PAUSE_LIMIT || (i & 1)))
CV_PAUSE(16);
else
CV_YIELD();
}
}
if (!job->is_completed)
{
CV_LOG_VERBOSE(NULL, 5, "MainThread: prepare wait " << j.active_thread_count << " " << j.completed_thread_count);
pthread_mutex_lock(&mutex_notify);
for (;;)
{
if (job->is_completed)
{
CV_LOG_VERBOSE(NULL, 5, "MainThread: job finalize (wait) " << j.active_thread_count << " " << j.completed_thread_count);
break;
}
CV_LOG_VERBOSE(NULL, 5, "MainThread: wait completion (sleep) ...");
pthread_cond_wait(&cond_thread_task_complete, &mutex_notify);
CV_LOG_VERBOSE(NULL, 5, "MainThread: wake");
}
pthread_mutex_unlock(&mutex_notify);
}
}
}
#ifdef CV_PROFILE_THREADS
threads_stat[0].threadFree = getTickCount();
std::cout << "Job: sz=" << range.size() << " nstripes=" << nstripes << " Time: " << (threads_stat[0].threadFree - jobSubmitTime) / tickFreq * 1e6 << " usec" << std::endl;
for (int i = 0; i < (int)threads.size() + 1; i++)
{
threads_stat[i].dump(i - 1, jobSubmitTime, tickFreq);
}
#endif
if (job)
{
pthread_mutex_lock(&mutex);
CV_LOG_VERBOSE(NULL, 5, "MainThread: job release");
CV_Assert(job->is_completed);
job.release();
pthread_mutex_unlock(&mutex);
}
}
}
else
{
body(range);
}
}
size_t ThreadPool::getNumOfThreads()
{
return num_threads;
}
void ThreadPool::setNumOfThreads(unsigned n)
{
if (n != num_threads)
{
num_threads = n;
if (n == 1)
if (job == NULL) reconfigure(0); // stop worker threads immediately
}
}
size_t parallel_pthreads_get_threads_num()
{
return ThreadPool::instance().getNumOfThreads();
}
void parallel_pthreads_set_threads_num(int num)
{
if(num < 0)
{
ThreadPool::instance().setNumOfThreads(0);
}
else
{
ThreadPool::instance().setNumOfThreads(unsigned(num));
}
}
void parallel_for_pthreads(const Range& range, const ParallelLoopBody& body, double nstripes)
{
ThreadPool::instance().run(range, body, nstripes);
}
}
#endif
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