// -*- c++ -*-
// win32-threads.h - Defines for using Win32 threads.
-/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2006 Free Software
+ Foundation
This file is part of libgcj.
#ifndef __JV_WIN32_THREADS__
#define __JV_WIN32_THREADS__
+#define WIN32_LEAN_AND_MEAN
#include <windows.h>
//
// Typedefs.
//
-typedef struct _Jv_ConditionVariable_t {
+typedef struct
+{
+ // ev[0] (signal) is a Win32 auto-reset event for _Jv_CondNotify
+ // ev[1] (broadcast) is a Win32 manual-reset event for _Jv_CondNotifyAll
HANDLE ev[2];
- CRITICAL_SECTION count_mutex;
+
+ // Number of threads waiting on this condition variable
int blocked_count;
-};
-typedef CRITICAL_SECTION _Jv_Mutex_t;
+ // Protects access to the blocked_count variable
+ CRITICAL_SECTION count_mutex;
+
+} _Jv_ConditionVariable_t;
typedef struct
+{
+ // The thread-id of the owner thread if any, 0 otherwise
+ DWORD owner;
+
+ // Track nested mutex acquisitions by the same thread
+ int refcount;
+
+ // The actual Windows construct used to implement this mutex
+ CRITICAL_SECTION cs;
+
+} _Jv_Mutex_t;
+
+typedef struct _Jv_Thread_t
{
int flags; // Flags are defined in implementation.
HANDLE handle; // Actual handle to the thread
+
+ // Protects access to the thread's interrupt_flag and
+ // interrupt_event variables within this module.
+ CRITICAL_SECTION interrupt_mutex;
+
+ // A Win32 auto-reset event for thread interruption
+ HANDLE interrupt_event;
+
java::lang::Thread *thread_obj;
} _Jv_Thread_t;
+typedef DWORD _Jv_ThreadId_t;
+
+inline _Jv_ThreadId_t
+_Jv_ThreadSelf (void)
+{
+ return GetCurrentThreadId();
+}
+
typedef void _Jv_ThreadStartFunc (java::lang::Thread *);
+// Type identifying a win32 thread.
+typedef HANDLE _Jv_ThreadDesc_t;
+
+inline _Jv_ThreadDesc_t
+_Jv_GetPlatformThreadID(_Jv_Thread_t *t)
+{
+ return t->handle;
+}
+
//
// Condition variables.
//
+#define _Jv_HaveCondDestroy
int _Jv_CondWait (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos);
void _Jv_CondInit (_Jv_ConditionVariable_t *cv);
void _Jv_CondDestroy (_Jv_ConditionVariable_t *cv);
// We use CRITICAL_SECTIONs instead of CreateMutex() for better performance
//
+// Returns 0 if the mutex lock is held by the current thread, and 1 otherwise.
+inline int _Jv_MutexCheckMonitor (_Jv_Mutex_t *mu)
+{
+ return (mu->owner != GetCurrentThreadId ( ));
+}
+
inline void _Jv_MutexInit (_Jv_Mutex_t *mu)
{
- InitializeCriticalSection(mu);
+ mu->owner = 0UL;
+ mu->refcount = 0;
+ InitializeCriticalSection (&(mu->cs));
}
#define _Jv_HaveMutexDestroy
inline void _Jv_MutexDestroy (_Jv_Mutex_t *mu)
{
- DeleteCriticalSection(mu);
+ mu->owner = 0UL;
+ mu->refcount = 0;
+ DeleteCriticalSection (&(mu->cs));
mu = NULL;
}
inline int _Jv_MutexUnlock (_Jv_Mutex_t *mu)
{
- LeaveCriticalSection(mu);
- return 0;
+ if (mu->owner == GetCurrentThreadId ( ))
+ {
+ mu->refcount--;
+ if (mu->refcount == 0)
+ mu->owner = 0UL;
+ LeaveCriticalSection (&(mu->cs));
+ return 0;
+ }
+ else
+ return 1;
}
inline int _Jv_MutexLock (_Jv_Mutex_t *mu)
{
- EnterCriticalSection(mu);
+ EnterCriticalSection (&(mu->cs));
+ mu->owner = GetCurrentThreadId ( );
+ mu->refcount++;
return 0;
}
inline void _Jv_ThreadYield (void)
{
- // FIXME: win98 freezes hard (OS hang) when we use this --
- // for now, we simply don't yield
- // Sleep (0);
+ Sleep (0);
}
void _Jv_ThreadRegister (_Jv_Thread_t *data);
void _Jv_ThreadWait (void);
void _Jv_ThreadInterrupt (_Jv_Thread_t *data);
+//
+// Thread interruption support
+//
+
+// Gets the auto-reset event for the current thread which is
+// signalled by _Jv_ThreadInterrupt. The caller can wait on this
+// event in addition to other waitable objects.
+//
+// NOTE: After waiting on this event with WaitForMultipleObjects,
+// you should ALWAYS use the return value of WaitForMultipleObjects
+// to test whether this event was signalled and whether thread
+// interruption has occurred. You should do this instead of checking
+// the thread's interrupted_flag, because someone could have reset
+// this flag in the interval of time between the return of
+// WaitForMultipleObjects and the time you query interrupted_flag.
+// See java/lang/natWin32Process.cc (waitFor) for an example.
+HANDLE _Jv_Win32GetInterruptEvent (void);
+
+// park() / unpark() support
+
+struct ParkHelper
+{
+ // We use LONG instead of obj_addr_t to avoid pulling in locks.h,
+ // which depends on size_t, ...
+ volatile LONG permit;
+
+ // The critical section is used for lazy initialization of our event
+ CRITICAL_SECTION cs;
+ HANDLE event;
+
+ void init ();
+ void deactivate ();
+ void destroy ();
+ void park (jboolean isAbsolute, jlong time);
+ void unpark ();
+
+private:
+ void init_event();
+};
+
// Remove defines from <windows.h> that conflict with various things in libgcj code
#undef TRUE
#undef interface
#undef STRICT
#undef VOID
+#undef TEXT
#endif /* __JV_WIN32_THREADS__ */