**************************************************************************/
/*
- * Simple OS abstraction.
+ * OS native thread abstraction.
*
- * Mimics C++11 / boost threads.
+ * Mimics C++11 threads.
*/
#ifndef _OS_THREAD_HPP_
#include <pthread.h>
#endif
+
+#define USE_WIN32_CONDITION_VARIABLES 0
+
+
+/**
+ * Compiler TLS.
+ *
+ * See also:
+ * - http://gcc.gnu.org/onlinedocs/gcc-4.6.3/gcc/Thread_002dLocal.html
+ * - http://msdn.microsoft.com/en-us/library/9w1sdazb.aspx
+ */
+#if defined(_MSC_VER)
+# define thread_specific __declspec(thread)
+#elif defined(__GNUC__)
+# define thread_specific __thread
+#else
+# define thread_specific
+# error "Unsupported compiler"
+#endif
+
+
namespace os {
*/
class condition_variable
{
- public:
+ private:
#ifdef _WIN32
+# if USE_WIN32_CONDITION_VARIABLES
+ // XXX: Only supported on Vista an higher. Not yet supported by WINE.
typedef CONDITION_VARIABLE native_handle_type;
+ native_handle_type _native_handle;
+#else
+ // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
+ LONG cWaiters;
+ HANDLE hEvent;
+#endif
#else
typedef pthread_cond_t native_handle_type;
+ native_handle_type _native_handle;
#endif
+ public:
condition_variable() {
#ifdef _WIN32
+# if USE_WIN32_CONDITION_VARIABLES
InitializeConditionVariable(&_native_handle);
+# else
+ cWaiters = 0;
+ hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
+# endif
#else
pthread_cond_init(&_native_handle, NULL);
#endif
~condition_variable() {
#ifdef _WIN32
+# if USE_WIN32_CONDITION_VARIABLES
/* No-op */
+# else
+ CloseHandle(hEvent);
+# endif
#else
pthread_cond_destroy(&_native_handle);
#endif
inline void
signal(void) {
#ifdef _WIN32
+# if USE_WIN32_CONDITION_VARIABLES
WakeConditionVariable(&_native_handle);
+# else
+ if (cWaiters) {
+ SetEvent(hEvent);
+ }
+# endif
#else
pthread_cond_signal(&_native_handle);
#endif
wait(unique_lock<mutex> & lock) {
mutex::native_handle_type & mutex_native_handle = lock.mutex()->native_handle();
#ifdef _WIN32
- /* FIXME */
+# if USE_WIN32_CONDITION_VARIABLES
SleepConditionVariableCS(&_native_handle, &mutex_native_handle, INFINITE);
+# else
+ InterlockedIncrement(&cWaiters);
+ LeaveCriticalSection(&mutex_native_handle);
+ WaitForSingleObject(hEvent, INFINITE);
+ EnterCriticalSection(&mutex_native_handle);
+ InterlockedDecrement(&cWaiters);
+# endif
#else
pthread_cond_wait(&_native_handle, &mutex_native_handle);
#endif
}
-
- protected:
- native_handle_type _native_handle;
};
/**
- * Same interface as boost::thread_specific_ptr.
+ * Same interface as std::thread
*/
- template <typename T>
- class thread_specific_ptr
- {
- private:
-#ifdef _WIN32
- DWORD dwTlsIndex;
-#else
- pthread_key_t key;
-
- static void destructor(void *ptr) {
- delete static_cast<T *>(ptr);
- }
-#endif
-
+ class thread {
public:
- thread_specific_ptr(void) {
-#ifdef _WIN32
- dwTlsIndex = TlsAlloc();
-#else
- pthread_key_create(&key, &destructor);
-#endif
- }
-
- ~thread_specific_ptr() {
#ifdef _WIN32
- TlsFree(dwTlsIndex);
-#else
- pthread_key_delete(key);
-#endif
- }
-
- T* get(void) const {
- void *ptr;
-#ifdef _WIN32
- ptr = TlsGetValue(dwTlsIndex);
+ typedef HANDLE native_handle_type;
#else
- ptr = pthread_getspecific(key);
+ typedef pthread_t native_handle_type;
#endif
- return static_cast<T*>(ptr);
- }
- T* operator -> (void) const
+ inline
+ thread() :
+ _native_handle(0)
{
- return get();
}
- T& operator * (void) const
+ inline
+ thread(const thread &other) :
+ _native_handle(other._native_handle)
{
- return *get();
}
- void reset(T* new_value=0) {
- T * old_value = get();
- set(new_value);
- if (old_value) {
- delete old_value;
- }
- }
-
- T* release (void) {
- T * old_value = get();
- set(0);
- return old_value;
- }
-
-private:
- void set(T* new_value) {
-#ifdef _WIN32
- TlsSetValue(dwTlsIndex, new_value);
-#else
- pthread_setspecific(key, new_value);
-#endif
- }
- };
-
-
- /**
- * Same interface as std::thread
- */
- class thread {
- public:
-#ifdef _WIN32
- typedef HANDLE native_handle_type;
-#else
- typedef pthread_t native_handle_type;
-#endif
-
template< class Function, class Arg >
- explicit thread( Function& f, Arg & arg ) {
+ explicit thread( Function& f, Arg arg ) {
#ifdef _WIN32
- /* FIXME */
DWORD id = 0;
_native_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)f, (LPVOID)arg, 0, &id);
#else
- pthread_create(&_native_handle, NULL, f, arg);
+ pthread_create(&_native_handle, NULL, (void *(*) (void *))f, (void *)arg);
#endif
}
+ inline bool
+ joinable(void) const {
+ return _native_handle != 0;
+ }
+
inline void
join() {
#ifdef _WIN32