#ifndef Py_INTERNAL_CONDVAR_H #define Py_INTERNAL_CONDVAR_H #ifndef Py_BUILD_CORE # error "this header requires Py_BUILD_CORE define" #endif #ifndef _POSIX_THREADS /* This means pthreads are not implemented in libc headers, hence the macro not present in unistd.h. But they still can be implemented as an external library (e.g. gnu pth in pthread emulation) */ # ifdef HAVE_PTHREAD_H # include <pthread.h> /* _POSIX_THREADS */ # endif #endif #ifdef _POSIX_THREADS /* * POSIX support */ #define Py_HAVE_CONDVAR #ifdef HAVE_PTHREAD_H # include <pthread.h> #endif #define PyMUTEX_T pthread_mutex_t #define PyCOND_T pthread_cond_t #elif defined(NT_THREADS) /* * Windows (XP, 2003 server and later, as well as (hopefully) CE) support * * Emulated condition variables ones that work with XP and later, plus * example native support on VISTA and onwards. */ #define Py_HAVE_CONDVAR /* include windows if it hasn't been done before */ #define WIN32_LEAN_AND_MEAN #include <windows.h> /* options */ /* non-emulated condition variables are provided for those that want * to target Windows Vista. Modify this macro to enable them. */ #ifndef _PY_EMULATED_WIN_CV #define _PY_EMULATED_WIN_CV 1 /* use emulated condition variables */ #endif /* fall back to emulation if not targeting Vista */ #if !defined NTDDI_VISTA || NTDDI_VERSION < NTDDI_VISTA #undef _PY_EMULATED_WIN_CV #define _PY_EMULATED_WIN_CV 1 #endif #if _PY_EMULATED_WIN_CV typedef CRITICAL_SECTION PyMUTEX_T; /* The ConditionVariable object. From XP onwards it is easily emulated with a Semaphore. Semaphores are available on Windows XP (2003 server) and later. We use a Semaphore rather than an auto-reset event, because although an auto-reset event might appear to solve the lost-wakeup bug (race condition between releasing the outer lock and waiting) because it maintains state even though a wait hasn't happened, there is still a lost wakeup problem if more than one thread are interrupted in the critical place. A semaphore solves that, because its state is counted, not Boolean. Because it is ok to signal a condition variable with no one waiting, we need to keep track of the number of waiting threads. Otherwise, the semaphore's state could rise without bound. This also helps reduce the number of "spurious wakeups" that would otherwise happen. */ typedef struct _PyCOND_T { HANDLE sem; int waiting; /* to allow PyCOND_SIGNAL to be a no-op */ } PyCOND_T; #else /* !_PY_EMULATED_WIN_CV */ /* Use native Win7 primitives if build target is Win7 or higher */ /* SRWLOCK is faster and better than CriticalSection */ typedef SRWLOCK PyMUTEX_T; typedef CONDITION_VARIABLE PyCOND_T; #endif /* _PY_EMULATED_WIN_CV */ #endif /* _POSIX_THREADS, NT_THREADS */ #endif /* Py_INTERNAL_CONDVAR_H */