mirror of
https://github.com/minetest/minetest.git
synced 2024-12-23 22:52:25 +01:00
Refactor Thread class to improve readability and portability
- Fix some incompatibilities with obscure platforms (AIX and WinCE) - Clean up Thread class interface - Add m_ prefix to private member variables - Simplify platform-dependent logic, reducing preprocessor conditional clauses and improving readibility - Add Thread class documentation
This commit is contained in:
kwolekr
parent
6be74d17df
commit
765a834cd0
@ -219,7 +219,7 @@ void EmergeManager::initMapgens()
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Mapgen *EmergeManager::getCurrentMapgen()
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{
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for (u32 i = 0; i != m_threads.size(); i++) {
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if (m_threads[i]->isSameThread())
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if (m_threads[i]->isCurrentThread())
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return m_threads[i]->m_mapgen;
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}
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@ -476,7 +476,7 @@ EmergeThread::EmergeThread(Server *server, int ethreadid) :
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m_emerge(NULL),
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m_mapgen(NULL)
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{
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name = "Emerge-" + itos(ethreadid);
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m_name = "Emerge-" + itos(ethreadid);
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}
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@ -26,48 +26,48 @@ DEALINGS IN THE SOFTWARE.
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#include "threading/thread.h"
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#include "threading/mutex_auto_lock.h"
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#include "log.h"
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#include "porting.h"
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#if __cplusplus >= 201103L
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#define UNUSED(expr) do { (void)(expr); } while (0)
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#if USE_CPP11_THREADS
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#include <chrono>
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#else
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#define UNUSED(expr) do { (void)(expr); } while (0)
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# ifdef _WIN32
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# ifndef _WIN32_WCE
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#include <process.h>
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# endif
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# else
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#include <ctime>
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#include <cassert>
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#include <cstdlib>
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#include <system_error>
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#elif USE_WIN_THREADS
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#ifndef _WIN32_WCE
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#include <process.h>
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#endif
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#elif USE_POSIX_THREADS
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#include <time.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/time.h>
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// For getNumberOfProcessors
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#include <unistd.h>
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# if defined(__FreeBSD__) || defined(__APPLE__)
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#include <sys/types.h>
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#include <sys/sysctl.h>
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# elif defined(_GNU_SOURCE)
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#include <sys/sysinfo.h>
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# endif
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# endif
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#if defined(__FreeBSD__) || defined(__APPLE__)
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#elif defined(_GNU_SOURCE)
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#include <sys/sysinfo.h>
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#endif
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#endif
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// For setName
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// for setName
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#if defined(linux) || defined(__linux)
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#include <sys/prctl.h>
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#elif defined(__FreeBSD__) || defined(__OpenBSD__)
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#include <pthread_np.h>
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#elif defined(_MSC_VER)
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struct THREADNAME_INFO {
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DWORD dwType; // Must be 0x1000
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LPCSTR szName; // Pointer to name (in user addr space)
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DWORD dwType; // Must be 0x1000
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LPCSTR szName; // Pointer to name (in user addr space)
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DWORD dwThreadID; // Thread ID (-1=caller thread)
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DWORD dwFlags; // Reserved for future use, must be zero
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DWORD dwFlags; // Reserved for future use, must be zero
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};
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#endif
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// For bindToProcessor
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// for bindToProcessor
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#if __FreeBSD_version >= 702106
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typedef cpuset_t cpu_set_t;
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#elif defined(__linux) || defined(linux)
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@ -78,6 +78,7 @@ DEALINGS IN THE SOFTWARE.
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#include <sys/procset.h>
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#elif defined(_AIX)
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#include <sys/processor.h>
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#include <sys/thread.h>
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#elif defined(__APPLE__)
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#include <mach/mach_init.h>
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#include <mach/thread_act.h>
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@ -85,188 +86,246 @@ DEALINGS IN THE SOFTWARE.
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Thread::Thread(const std::string &name) :
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name(name),
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retval(NULL),
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request_stop(false),
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running(false)
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#if __cplusplus >= 201103L
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, thread(NULL)
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#elif !defined(_WIN32)
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, started(false)
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#endif
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{}
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void Thread::wait()
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m_name(name),
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m_retval(NULL),
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m_request_stop(false),
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m_running(false)
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{
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#if __cplusplus >= 201103L
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if (!thread || !thread->joinable())
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return;
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thread->join();
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#elif defined(_WIN32)
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if (!running)
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return;
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WaitForSingleObject(thread, INFINITE);
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#else // pthread
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void *status;
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if (!started)
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return;
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int ret = pthread_join(thread, &status);
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assert(!ret);
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UNUSED(ret);
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started = false;
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#ifdef _AIX
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m_kernel_thread_id = -1;
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#endif
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#if USE_CPP11_THREADS
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m_thread_obj = NULL;
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#endif
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}
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Thread::~Thread()
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{
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kill();
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}
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bool Thread::start()
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{
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if (running)
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MutexAutoLock lock(m_continue_mutex);
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if (m_running)
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return false;
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request_stop = false;
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#if __cplusplus >= 201103L
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MutexAutoLock l(continue_mutex);
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thread = new std::thread(theThread, this);
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#elif defined(_WIN32)
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MutexAutoLock l(continue_mutex);
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# ifdef _WIN32_WCE
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thread = CreateThread(NULL, 0, theThread, this, 0, &thread_id);
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# else
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thread = (HANDLE)_beginthreadex(NULL, 0, theThread, this, 0, &thread_id);
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# endif
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if (!thread)
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cleanup();
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#if USE_CPP11_THREADS
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try {
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m_thread_obj = new std::thread(threadProc, this);
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m_thread_id = m_thread->get_id();
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m_thread_handle = m_thread->native_handle();
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} except (const std::system_error &e) {
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return false;
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#else
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int status;
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}
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MutexAutoLock l(continue_mutex);
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#elif USE_WIN_THREADS
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status = pthread_create(&thread, NULL, theThread, this);
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m_thread_handle = CreateThread(NULL, 0, threadProc, this, 0, &m_thread_id);
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if (!m_thread_handle)
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return false;
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#elif USE_POSIX_THREADS
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int status = pthread_create(&m_thread_handle, NULL, threadProc, this);
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if (status)
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return false;
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m_thread_id = m_thread_handle;
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#endif
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#if __cplusplus < 201103L
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// Wait until running
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while (!running) {
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# ifdef _WIN32
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Sleep(1);
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}
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# else
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struct timespec req, rem;
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req.tv_sec = 0;
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req.tv_nsec = 1000000;
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nanosleep(&req, &rem);
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}
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started = true;
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# endif
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#endif
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while (!m_running)
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sleep_ms(1);
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return true;
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}
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bool Thread::stop()
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{
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m_request_stop = true;
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return true;
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}
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void Thread::wait()
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{
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if (!m_running)
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return;
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#if USE_CPP11_THREADS
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m_thread_obj->join();
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#elif USE_WIN_THREADS
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int ret == WaitForSingleObject(m_thread_handle, INFINITE);
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assert(ret == WAIT_OBJECT_0);
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UNUSED(ret);
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#elif USE_POSIX_THREADS
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int ret = pthread_join(m_thread_handle, NULL);
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assert(ret == 0);
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UNUSED(ret);
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#endif
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assert(m_running == false);
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return;
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}
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bool Thread::kill()
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{
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#ifdef _WIN32
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if (!running)
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return false;
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TerminateThread(getThreadHandle(), 0);
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CloseHandle(getThreadHandle());
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#else
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if (!running) {
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if (!m_running) {
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wait();
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return false;
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}
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#ifdef _WIN32
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TerminateThread(m_thread_handle, 0);
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#else
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// We need to pthread_kill instead on Android since NDKv5's pthread
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// implementation is incomplete.
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# ifdef __ANDROID__
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pthread_kill(getThreadHandle(), SIGKILL);
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pthread_kill(m_thread_handle, SIGKILL);
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# else
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pthread_cancel(getThreadHandle());
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pthread_cancel(m_thread_handle);
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# endif
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wait();
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#endif
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#if __cplusplus >= 201103L
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delete thread;
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#endif
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running = false;
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cleanup();
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return true;
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}
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bool Thread::isSameThread()
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void Thread::cleanup()
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{
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#if __cplusplus >= 201103L
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return thread->get_id() == std::this_thread::get_id();
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#elif defined(_WIN32)
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return GetCurrentThreadId() == thread_id;
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#else
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return pthread_equal(pthread_self(), thread);
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#if USE_CPP11_THREADS
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delete m_thread_obj;
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m_thread_obj = NULL;
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#elif USE_WIN_THREADS
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CloseHandle(m_thread_handle);
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m_thread_handle = NULL;
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m_thread_id = -1;
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#elif USE_POSIX_THREADS
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// Can't do any cleanup for pthreads
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#endif
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m_name = "";
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m_retval = NULL;
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m_running = false;
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m_request_stop = false;
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}
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#if __cplusplus >= 201103L
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void Thread::theThread(Thread *th)
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bool Thread::getReturnValue(void **ret)
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{
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if (m_running)
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return false;
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*ret = m_retval;
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return true;
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}
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bool Thread::isCurrentThread()
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{
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return thr_is_current_thread(m_thread_id);
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}
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#if USE_CPP11_THREADS || USE_POSIX_THREADS
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void *(Thread::threadProc)(void *param)
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#elif defined(_WIN32_WCE)
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DWORD WINAPI Thread::theThread(void *param)
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DWORD (Thread::threadProc)(LPVOID param)
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#elif defined(_WIN32)
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UINT __stdcall Thread::theThread(void *param)
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#else
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void *Thread::theThread(void *param)
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DWORD WINAPI (Thread::threadProc)(LPVOID param)
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#endif
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{
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#if __cplusplus < 201103L
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Thread *th = static_cast<Thread *>(param);
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Thread *thr = (Thread *)param;
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#ifdef _AIX
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m_kernel_thread_id = thread_self();
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#endif
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th->running = true;
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th->setName();
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g_logger.registerThread(th->name);
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thr->setName(thr->m_name);
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th->retval = th->run();
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g_logger.registerThread(thr->m_name);
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thr->m_running = true;
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thr->m_retval = thr->run();
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thr->m_running = false;
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g_logger.deregisterThread();
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th->running = false;
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#if __cplusplus < 201103L
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# ifdef _WIN32
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CloseHandle(th->thread);
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# endif
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return NULL;
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#endif
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}
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void Thread::setName(const std::string &name)
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{
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#if defined(linux) || defined(__linux)
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/* It would be cleaner to do this with pthread_setname_np,
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* which was added to glibc in version 2.12, but some major
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* distributions are still runing 2.11 and previous versions.
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*/
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// It would be cleaner to do this with pthread_setname_np,
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// which was added to glibc in version 2.12, but some major
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// distributions are still runing 2.11 and previous versions.
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prctl(PR_SET_NAME, name.c_str());
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#elif defined(__FreeBSD__) || defined(__OpenBSD__)
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pthread_set_name_np(pthread_self(), name.c_str());
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#elif defined(__NetBSD__)
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pthread_setname_np(pthread_self(), name.c_str());
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#elif defined(__APPLE__)
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pthread_setname_np(name.c_str());
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#elif defined(_MSC_VER)
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// Windows itself doesn't support thread names,
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// but the MSVC debugger does...
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THREADNAME_INFO info;
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info.dwType = 0x1000;
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info.szName = name.c_str();
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info.dwThreadID = -1;
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info.dwFlags = 0;
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__try {
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RaiseException(0x406D1388, 0, sizeof(info) / sizeof(DWORD), (ULONG_PTR *)&info);
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RaiseException(0x406D1388, 0,
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sizeof(info) / sizeof(DWORD), (ULONG_PTR *)&info);
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} __except (EXCEPTION_CONTINUE_EXECUTION) {
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}
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#elif defined(_WIN32) || defined(__GNU__)
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// These platforms are known to not support thread names.
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// Silently ignore the request.
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#else
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#warning "Unrecognized platform, thread names will not be available."
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#endif
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@ -276,59 +335,96 @@ void Thread::setName(const std::string &name)
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unsigned int Thread::getNumberOfProcessors()
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{
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#if __cplusplus >= 201103L
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return std::thread::hardware_concurrency();
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#elif defined(_SC_NPROCESSORS_ONLN)
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return sysconf(_SC_NPROCESSORS_ONLN);
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#elif defined(__FreeBSD__) || defined(__APPLE__)
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unsigned int len, count;
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len = sizeof(count);
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return sysctlbyname("hw.ncpu", &count, &len, NULL, 0);
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#elif defined(__FreeBSD__) || defined(__NetBSD__) || \
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defined(__DragonFly__) || defined(__APPLE__)
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unsigned int num_cpus = 1;
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size_t len = sizeof(num_cpus);
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int mib[2];
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mib[0] = CTL_HW;
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mib[1] = HW_NCPU;
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sysctl(mib, 2, &num_cpus, &len, NULL, 0);
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return num_cpus;
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#elif defined(_GNU_SOURCE)
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return get_nprocs();
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#elif defined(_WIN32)
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SYSTEM_INFO sysinfo;
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GetSystemInfo(&sysinfo);
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return sysinfo.dwNumberOfProcessors;
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#elif defined(PTW32_VERSION) || defined(__hpux)
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return pthread_num_processors_np();
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#else
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return 1;
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#endif
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}
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bool Thread::bindToProcessor(unsigned int num)
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bool Thread::bindToProcessor(unsigned int proc_number)
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{
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#if defined(__ANDROID__)
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return false;
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#elif defined(_WIN32)
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return SetThreadAffinityMask(getThreadHandle(), 1 << num);
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return SetThreadAffinityMask(m_thread_handle, 1 << proc_number);
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#elif __FreeBSD_version >= 702106 || defined(__linux) || defined(linux)
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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CPU_SET(num, &cpuset);
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return pthread_setaffinity_np(getThreadHandle(), sizeof(cpuset),
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&cpuset) == 0;
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CPU_SET(proc_number, &cpuset);
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return pthread_setaffinity_np(m_thread_handle, sizeof(cpuset), &cpuset) == 0;
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#elif defined(__sun) || defined(sun)
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return processor_bind(P_LWPID, MAKE_LWPID_PTHREAD(getThreadHandle()),
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num, NULL) == 0
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return processor_bind(P_LWPID, P_MYID, proc_number, NULL) == 0
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#elif defined(_AIX)
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return bindprocessor(BINDTHREAD, (tid_t) getThreadHandle(), pnumber) == 0;
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return bindprocessor(BINDTHREAD, m_kernel_thread_id, proc_number) == 0;
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#elif defined(__hpux) || defined(hpux)
|
||||
|
||||
pthread_spu_t answer;
|
||||
|
||||
return pthread_processor_bind_np(PTHREAD_BIND_ADVISORY_NP,
|
||||
&answer, num, getThreadHandle()) == 0;
|
||||
&answer, proc_number, m_thread_handle) == 0;
|
||||
|
||||
#elif defined(__APPLE__)
|
||||
|
||||
struct thread_affinity_policy tapol;
|
||||
|
||||
thread_port_t threadport = pthread_mach_thread_np(getThreadHandle());
|
||||
tapol.affinity_tag = num + 1;
|
||||
thread_port_t threadport = pthread_mach_thread_np(m_thread_handle);
|
||||
tapol.affinity_tag = proc_number + 1;
|
||||
return thread_policy_set(threadport, THREAD_AFFINITY_POLICY,
|
||||
(thread_policy_t)&tapol,
|
||||
THREAD_AFFINITY_POLICY_COUNT) == KERN_SUCCESS;
|
||||
|
||||
#else
|
||||
|
||||
return false;
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
@ -336,19 +432,23 @@ bool Thread::bindToProcessor(unsigned int num)
|
||||
bool Thread::setPriority(int prio)
|
||||
{
|
||||
#if defined(_WIN32)
|
||||
return SetThreadPriority(getThreadHandle(), prio);
|
||||
|
||||
return SetThreadPriority(m_thread_handle, prio);
|
||||
|
||||
#else
|
||||
|
||||
struct sched_param sparam;
|
||||
int policy;
|
||||
|
||||
if (pthread_getschedparam(getThreadHandle(), &policy, &sparam) != 0)
|
||||
if (pthread_getschedparam(m_thread_handle, &policy, &sparam) != 0)
|
||||
return false;
|
||||
|
||||
int min = sched_get_priority_min(policy);
|
||||
int max = sched_get_priority_max(policy);
|
||||
|
||||
sparam.sched_priority = min + prio * (max - min) / THREAD_PRIORITY_HIGHEST;
|
||||
return pthread_setschedparam(getThreadHandle(), policy, &sparam) == 0;
|
||||
return pthread_setschedparam(m_thread_handle, policy, &sparam) == 0;
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
@ -28,91 +28,136 @@ DEALINGS IN THE SOFTWARE.
|
||||
|
||||
#include "threading/atomic.h"
|
||||
#include "threading/mutex.h"
|
||||
#include "threads.h"
|
||||
|
||||
#include <string>
|
||||
#if __cplusplus >= 201103L
|
||||
#if USE_CPP11_THREADS
|
||||
#include <thread>
|
||||
#endif
|
||||
|
||||
#ifndef _WIN32
|
||||
enum {
|
||||
THREAD_PRIORITY_LOWEST,
|
||||
THREAD_PRIORITY_BELOW_NORMAL,
|
||||
THREAD_PRIORITY_NORMAL,
|
||||
THREAD_PRIORITY_ABOVE_NORMAL,
|
||||
THREAD_PRIORITY_HIGHEST,
|
||||
};
|
||||
/*
|
||||
* On platforms using pthreads, these five priority classes correlate to
|
||||
* even divisions between the minimum and maximum reported thread priority.
|
||||
*/
|
||||
#if !defined(_WIN32)
|
||||
#define THREAD_PRIORITY_LOWEST 0
|
||||
#define THREAD_PRIORITY_BELOW_NORMAL 1
|
||||
#define THREAD_PRIORITY_NORMAL 2
|
||||
#define THREAD_PRIORITY_ABOVE_NORMAL 3
|
||||
#define THREAD_PRIORITY_HIGHEST 4
|
||||
#endif
|
||||
|
||||
|
||||
class Thread
|
||||
{
|
||||
class Thread {
|
||||
public:
|
||||
Thread(const std::string &name="Unnamed");
|
||||
virtual ~Thread() { kill(); }
|
||||
|
||||
bool start();
|
||||
inline void stop() { request_stop = true; }
|
||||
bool kill();
|
||||
|
||||
inline bool isRunning() { return running; }
|
||||
inline bool stopRequested() { return request_stop; }
|
||||
void *getReturnValue() { return running ? NULL : retval; }
|
||||
bool isSameThread();
|
||||
|
||||
static unsigned int getNumberOfProcessors();
|
||||
bool bindToProcessor(unsigned int);
|
||||
bool setPriority(int);
|
||||
Thread(const std::string &name="");
|
||||
virtual ~Thread();
|
||||
|
||||
/*
|
||||
* Wait for thread to finish.
|
||||
* Note: this does not stop a thread, you have to do this on your own.
|
||||
* Begins execution of a new thread at the pure virtual method Thread::run().
|
||||
* Execution of the thread is guaranteed to have started after this function
|
||||
* returns.
|
||||
*/
|
||||
bool start();
|
||||
|
||||
/*
|
||||
* Requests that the thread exit gracefully.
|
||||
* Returns immediately; thread execution is guaranteed to be complete after
|
||||
* a subsequent call to Thread::wait.
|
||||
*/
|
||||
bool stop();
|
||||
|
||||
/*
|
||||
* Immediately terminates the thread.
|
||||
* This should be used with extreme caution, as the thread will not have
|
||||
* any opportunity to release resources it may be holding (such as memory
|
||||
* or locks).
|
||||
*/
|
||||
bool kill();
|
||||
|
||||
/*
|
||||
* Waits for thread to finish.
|
||||
* Note: This does not stop a thread, you have to do this on your own.
|
||||
* Returns immediately if the thread is not started.
|
||||
*/
|
||||
void wait();
|
||||
|
||||
/*
|
||||
* Returns true if the calling thread is this Thread object.
|
||||
*/
|
||||
bool isCurrentThread();
|
||||
|
||||
inline bool isRunning() { return m_running; }
|
||||
inline bool stopRequested() { return m_request_stop; }
|
||||
inline threadid_t getThreadId() { return m_thread_id; }
|
||||
inline threadhandle_t getThreadHandle() { return m_thread_handle; }
|
||||
|
||||
/*
|
||||
* Gets the thread return value.
|
||||
* Returns true if the thread has exited and the return value was available,
|
||||
* or false if the thread has yet to finish.
|
||||
*/
|
||||
bool getReturnValue(void **ret);
|
||||
|
||||
/*
|
||||
* Binds (if possible, otherwise sets the affinity of) the thread to the
|
||||
* specific processor specified by proc_number.
|
||||
*/
|
||||
bool bindToProcessor(unsigned int proc_number);
|
||||
|
||||
/*
|
||||
* Sets the thread priority to the specified priority.
|
||||
*
|
||||
* prio can be one of: THREAD_PRIORITY_LOWEST, THREAD_PRIORITY_BELOW_NORMAL,
|
||||
* THREAD_PRIORITY_NORMAL, THREAD_PRIORITY_ABOVE_NORMAL, THREAD_PRIORITY_HIGHEST.
|
||||
* On Windows, any of the other priorites as defined by SetThreadPriority
|
||||
* are supported as well.
|
||||
*
|
||||
* Note that it may be necessary to first set the threading policy or
|
||||
* scheduling algorithm to one that supports thread priorities if not
|
||||
* supported by default, otherwise this call will have no effect.
|
||||
*/
|
||||
bool setPriority(int prio);
|
||||
|
||||
/*
|
||||
* Sets the currently executing thread's name to where supported; useful
|
||||
* for debugging.
|
||||
*/
|
||||
static void setName(const std::string &name);
|
||||
|
||||
/*
|
||||
* Returns the number of processors/cores configured and active on this machine.
|
||||
*/
|
||||
static unsigned int getNumberOfProcessors();
|
||||
|
||||
protected:
|
||||
std::string name;
|
||||
std::string m_name;
|
||||
|
||||
virtual void *run() = 0;
|
||||
|
||||
private:
|
||||
void setName() { setName(name); }
|
||||
void *m_retval;
|
||||
Atomic<bool> m_request_stop;
|
||||
Atomic<bool> m_running;
|
||||
Mutex m_continue_mutex;
|
||||
|
||||
void *retval;
|
||||
Atomic<bool> request_stop;
|
||||
Atomic<bool> running;
|
||||
Mutex continue_mutex;
|
||||
threadid_t m_thread_id;
|
||||
threadhandle_t m_thread_handle;
|
||||
|
||||
#if __cplusplus >= 201103L
|
||||
static void theThread(Thread *th);
|
||||
void cleanup();
|
||||
|
||||
std::thread *thread;
|
||||
std::thread::native_handle_type getThreadHandle() const
|
||||
{ return thread->native_handle(); }
|
||||
#else
|
||||
# if defined(WIN32) || defined(_WIN32_WCE)
|
||||
# ifdef _WIN32_WCE
|
||||
DWORD thread_id;
|
||||
static DWORD WINAPI theThread(void *param);
|
||||
# else
|
||||
UINT thread_id;
|
||||
static UINT __stdcall theThread(void *param);
|
||||
# endif
|
||||
static ThreadStartFunc threadProc;
|
||||
|
||||
HANDLE thread;
|
||||
HANDLE getThreadHandle() const { return thread; }
|
||||
# else // pthread
|
||||
static void *theThread(void *param);
|
||||
|
||||
pthread_t thread;
|
||||
pthread_t getThreadHandle() const { return thread; }
|
||||
|
||||
Atomic<bool> started;
|
||||
# endif
|
||||
#ifdef _AIX
|
||||
// For AIX, there does not exist any mapping from pthread_t to tid_t
|
||||
// available to us, so we maintain one ourselves. This is set on thread start.
|
||||
tid_t m_kernel_thread_id;
|
||||
#endif
|
||||
|
||||
#if USE_CPP11_THREADS
|
||||
std::thread *m_thread_obj;
|
||||
#endif
|
||||
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user