#include "SkCondVar.h"
+#if defined(SK_BUILD_FOR_WIN32)
+ static void (WINAPI *initialize_condition_variable)(PCONDITION_VARIABLE);
+ static BOOL (WINAPI *sleep_condition_variable)(PCONDITION_VARIABLE, PCRITICAL_SECTION, DWORD);
+ static void (WINAPI *wake_condition_variable)(PCONDITION_VARIABLE);
+ static void (WINAPI *wake_all_condition_variable)(PCONDITION_VARIABLE);
+
+ template <typename T>
+ static void set_fn_ptr(T* ptr, FARPROC fn) { *ptr = reinterpret_cast<T>(fn); }
+#endif
+
+bool SkCondVar::Supported() {
+#ifdef SK_USE_POSIX_THREADS
+ return true;
+#elif defined(SK_BUILD_FOR_WIN32)
+ // If we're >= Vista we'll find these functions. Otherwise (XP) SkCondVar is not supported.
+ HMODULE kernel32 = GetModuleHandleA("kernel32.dll");
+ set_fn_ptr(&initialize_condition_variable,
+ GetProcAddress(kernel32, "InitializeConditionVariable"));
+ set_fn_ptr(&sleep_condition_variable,
+ GetProcAddress(kernel32, "SleepConditionVariableCS"));
+ set_fn_ptr(&wake_condition_variable,
+ GetProcAddress(kernel32, "WakeConditionVariable"));
+ set_fn_ptr(&wake_all_condition_variable,
+ GetProcAddress(kernel32, "WakeAllConditionVariable"));
+ return initialize_condition_variable
+ && sleep_condition_variable
+ && wake_condition_variable
+ && wake_all_condition_variable;
+#else
+ return false;
+#endif
+}
+
SkCondVar::SkCondVar() {
#ifdef SK_USE_POSIX_THREADS
pthread_mutex_init(&fMutex, NULL /* default mutex attr */);
pthread_cond_init(&fCond, NULL /* default cond attr */);
#elif defined(SK_BUILD_FOR_WIN32)
InitializeCriticalSection(&fCriticalSection);
- InitializeConditionVariable(&fCondition);
+ SkASSERT(initialize_condition_variable);
+ initialize_condition_variable(&fCondition);
#endif
}
#ifdef SK_USE_POSIX_THREADS
pthread_cond_wait(&fCond, &fMutex);
#elif defined(SK_BUILD_FOR_WIN32)
- SleepConditionVariableCS(&fCondition, &fCriticalSection, INFINITE);
+ SkASSERT(sleep_condition_variable);
+ sleep_condition_variable(&fCondition, &fCriticalSection, INFINITE);
#endif
}
#ifdef SK_USE_POSIX_THREADS
pthread_cond_signal(&fCond);
#elif defined(SK_BUILD_FOR_WIN32)
- WakeConditionVariable(&fCondition);
+ SkASSERT(wake_condition_variable);
+ wake_condition_variable(&fCondition);
#endif
}
#ifdef SK_USE_POSIX_THREADS
pthread_cond_broadcast(&fCond);
#elif defined(SK_BUILD_FOR_WIN32)
- WakeAllConditionVariable(&fCondition);
+ SkASSERT(wake_all_condition_variable);
+ wake_all_condition_variable(&fCondition);
#endif
}