/**************************************************************************
*
- * Copyright 2011 Jose Fonseca
+ * Copyright 2011-2012 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
**************************************************************************/
/*
- * Simple OS abstraction.
+ * OS native thread abstraction.
*
- * Mimics C++11 / boost threads.
+ * Mimics C++11 threads.
*/
#ifndef _OS_THREAD_HPP_
#include <pthread.h>
#endif
+
+/*
+ * This feature is not supported on Windows XP
+ */
+#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(HAVE_COMPILER_TLS)
+# define OS_THREAD_SPECIFIC_PTR(_type) HAVE_COMPILER_TLS _type *
+#else
+# define OS_THREAD_SPECIFIC_PTR(_type) os::thread_specific_ptr< _type >
+#endif
+
+
namespace os {
/**
- * Same interface as boost::thread_specific_ptr.
+ * Same interface as std::unique_lock;
*/
+ template< class Mutex >
+ class unique_lock
+ {
+ public:
+ typedef Mutex mutex_type;
+
+ inline explicit
+ unique_lock(mutex_type & mutex) :
+ _mutex(&mutex)
+ {
+ _mutex->lock();
+ }
+
+ inline
+ ~unique_lock() {
+ _mutex->unlock();
+ }
+
+ inline void
+ lock() {
+ _mutex->lock();
+ }
+
+ inline void
+ unlock() {
+ _mutex->unlock();
+ }
+
+ mutex_type *
+ mutex() const {
+ return _mutex;
+ }
+
+ protected:
+ mutex_type *_mutex;
+ };
+
+
+ /**
+ * Same interface as std::condition_variable
+ */
+ class condition_variable
+ {
+ 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
+ }
+
+ inline void
+ wait(unique_lock<mutex> & lock) {
+ mutex::native_handle_type & mutex_native_handle = lock.mutex()->native_handle();
+#ifdef _WIN32
+# 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
+ }
+ };
+
+
template <typename T>
class thread_specific_ptr
{
DWORD dwTlsIndex;
#else
pthread_key_t key;
-
- static void destructor(void *ptr) {
- delete static_cast<T *>(ptr);
- }
#endif
public:
#ifdef _WIN32
dwTlsIndex = TlsAlloc();
#else
- pthread_key_create(&key, &destructor);
+ pthread_key_create(&key, NULL);
#endif
}
#endif
}
- T* get(void) const {
+ inline T *
+ get(void) const {
void *ptr;
#ifdef _WIN32
ptr = TlsGetValue(dwTlsIndex);
return static_cast<T*>(ptr);
}
- T* operator -> (void) const
+ inline
+ operator T * (void) const
+ {
+ return get();
+ }
+
+ inline T *
+ operator -> (void) const
{
return get();
}
- T& operator * (void) const
+ inline T *
+ operator = (T * new_value)
{
- return *get();
+ set(new_value);
+ return new_value;
}
- void reset(T* new_value=0) {
- T * old_value = get();
+ inline void
+ set(T* new_value) {
#ifdef _WIN32
TlsSetValue(dwTlsIndex, new_value);
#else
pthread_setspecific(key, new_value);
#endif
- if (old_value) {
- delete old_value;
- }
}
};
+ /**
+ * Same interface as std::thread
+ */
+ class thread {
+ public:
+#ifdef _WIN32
+ typedef HANDLE native_handle_type;
+#else
+ typedef pthread_t native_handle_type;
+#endif
+
+ inline
+ thread() :
+ _native_handle(0)
+ {
+ }
+
+ inline
+ thread(const thread &other) :
+ _native_handle(other._native_handle)
+ {
+ }
+
+ inline
+ ~thread() {
+ }
+
+ template< class Function, class Arg >
+ explicit thread( Function& f, Arg arg ) {
+#ifdef _WIN32
+ DWORD id = 0;
+ _native_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)f, (LPVOID)arg, 0, &id);
+#else
+ pthread_create(&_native_handle, NULL, (void *(*) (void *))f, (void *)arg);
+#endif
+ }
+
+ inline thread &
+ operator =(const thread &other) {
+ _native_handle = other._native_handle;
+ return *this;
+ }
+
+ inline bool
+ joinable(void) const {
+ return _native_handle != 0;
+ }
+
+ inline void
+ join() {
+#ifdef _WIN32
+ WaitForSingleObject(_native_handle, INFINITE);
+#else
+ pthread_join(_native_handle, NULL);
+#endif
+ }
+
+ private:
+ native_handle_type _native_handle;
+
+#if 0
+#ifdef _WIN32
+ template< class Function, class Arg >
+ static DWORD WINAPI
+ ThreadProc(LPVOID lpParameter) {
+
+ );
+#endif
+#endif
+ };
+
} /* namespace os */
#endif /* _OS_THREAD_HPP_ */
projects / apitrace / blobdiff