libjava/include/win32-threads.h

   1 // -*- c++ -*-
   2 // win32-threads.h - Defines for using Win32 threads.
   3
   4 /* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software
   5    Foundation
   6
   7    This file is part of libgcj.
   8
   9 This software is copyrighted work licensed under the terms of the
  10 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
  11 details.  */
  12
  13 #ifndef __JV_WIN32_THREADS__
  14 #define __JV_WIN32_THREADS__
  15
  16 #define WIN32_LEAN_AND_MEAN
  17 #include <windows.h>
  18
  19 //
  20 // Typedefs.
  21 //
  22
  23 typedef struct
  24 {
  25   // ev[0] (signal) is a Win32 auto-reset event for _Jv_CondNotify
  26   // ev[1] (broadcast) is a Win32 manual-reset event for _Jv_CondNotifyAll
  27   HANDLE ev[2];
  28
  29   // Number of threads waiting on this condition variable
  30   int blocked_count;
  31
  32   // Protects access to the blocked_count variable
  33   CRITICAL_SECTION count_mutex;
  34
  35 } _Jv_ConditionVariable_t;
  36
  37 typedef struct
  38 {
  39   // The thread-id of the owner thread if any, 0 otherwise
  40   DWORD owner;
  41
  42   // Track nested mutex acquisitions by the same thread
  43   int refcount;
  44
  45   // The actual Windows construct used to implement this mutex
  46   CRITICAL_SECTION cs;
  47
  48 } _Jv_Mutex_t;
  49
  50 typedef struct
  51 {
  52   int flags;            // Flags are defined in implementation.
  53   HANDLE handle;        // Actual handle to the thread
  54
  55   // Protects access to the thread's interrupt_flag and
  56   // interrupt_event variables within this module.
  57   CRITICAL_SECTION interrupt_mutex;
  58
  59   // A Win32 auto-reset event for thread interruption
  60   HANDLE interrupt_event;
  61
  62   java::lang::Thread *thread_obj;
  63 } _Jv_Thread_t;
  64
  65 typedef DWORD _Jv_ThreadId_t;
  66
  67 inline _Jv_ThreadId_t
  68 _Jv_ThreadSelf (void)
  69 {
  70   return GetCurrentThreadId();
  71 }
  72
  73 typedef void _Jv_ThreadStartFunc (java::lang::Thread *);
  74
  75 //
  76 // Condition variables.
  77 //
  78
  79 #define _Jv_HaveCondDestroy
  80 int _Jv_CondWait (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos);
  81 void _Jv_CondInit (_Jv_ConditionVariable_t *cv);
  82 void _Jv_CondDestroy (_Jv_ConditionVariable_t *cv);
  83 int _Jv_CondNotify (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *);
  84 int _Jv_CondNotifyAll (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *);
  85
  86 //
  87 // Mutexes.
  88 // We use CRITICAL_SECTIONs instead of CreateMutex() for better performance
  89 //
  90
  91 // Returns 0 if the mutex lock is held by the current thread, and 1 otherwise.
  92 inline int _Jv_MutexCheckMonitor (_Jv_Mutex_t *mu)
  93 {
  94   return (mu->owner != GetCurrentThreadId ( ));
  95 }
  96
  97 inline void _Jv_MutexInit (_Jv_Mutex_t *mu)
  98 {
  99   mu->owner = 0UL;
 100   mu->refcount = 0;
 101   InitializeCriticalSection (&(mu->cs));
 102 }
 103
 104 #define _Jv_HaveMutexDestroy
 105 inline void _Jv_MutexDestroy (_Jv_Mutex_t *mu)
 106 {
 107   mu->owner = 0UL;
 108   mu->refcount = 0;
 109   DeleteCriticalSection (&(mu->cs));
 110   mu = NULL;
 111 }
 112
 113 inline int _Jv_MutexUnlock (_Jv_Mutex_t *mu)
 114 {
 115   if (mu->owner == GetCurrentThreadId ( ))
 116     {
 117       mu->refcount--;
 118       if (mu->refcount == 0)
 119         mu->owner = 0UL;
 120       LeaveCriticalSection (&(mu->cs));
 121       return 0;
 122     }
 123   else
 124     return 1;
 125 }
 126
 127 inline int _Jv_MutexLock (_Jv_Mutex_t *mu)
 128 {
 129   EnterCriticalSection (&(mu->cs));
 130   mu->owner = GetCurrentThreadId ( );
 131   mu->refcount++;
 132   return 0;
 133 }
 134
 135 //
 136 // Thread creation and manipulation.
 137 //
 138
 139 void _Jv_InitThreads (void);
 140 _Jv_Thread_t *_Jv_ThreadInitData (java::lang::Thread *thread);
 141 void _Jv_ThreadDestroyData (_Jv_Thread_t *data);
 142
 143 inline java::lang::Thread* _Jv_ThreadCurrent (void)
 144 {
 145   extern DWORD _Jv_ThreadKey;
 146   return (java::lang::Thread *) TlsGetValue(_Jv_ThreadKey);
 147 }
 148
 149 inline _Jv_Thread_t *_Jv_ThreadCurrentData(void)
 150 {
 151   extern DWORD _Jv_ThreadDataKey;
 152   return (_Jv_Thread_t *) TlsGetValue(_Jv_ThreadDataKey);
 153 }
 154
 155 inline void _Jv_ThreadYield (void)
 156 {
 157   Sleep (0);
 158 }
 159
 160 void _Jv_ThreadRegister (_Jv_Thread_t *data);
 161 void _Jv_ThreadUnRegister ();
 162
 163 void _Jv_ThreadSetPriority (_Jv_Thread_t *data, jint prio);
 164 void _Jv_ThreadStart (java::lang::Thread *thread, _Jv_Thread_t *data,
 165                       _Jv_ThreadStartFunc *meth);
 166 void _Jv_ThreadWait (void);
 167 void _Jv_ThreadInterrupt (_Jv_Thread_t *data);
 168
 169 //
 170 // Thread interruption support
 171 //
 172
 173 // Gets the auto-reset event for the current thread which is
 174 // signalled by _Jv_ThreadInterrupt. The caller can wait on this
 175 // event in addition to other waitable objects.
 176 //
 177 // NOTE: After waiting on this event with WaitForMultipleObjects,
 178 // you should ALWAYS use the return value of WaitForMultipleObjects
 179 // to test whether this event was signalled and whether thread
 180 // interruption has occurred. You should do this instead of checking
 181 // the thread's interrupted_flag, because someone could have reset
 182 // this flag in the interval of time between the return of
 183 // WaitForMultipleObjects and the time you query interrupted_flag.
 184 // See java/lang/natWin32Process.cc (waitFor) for an example.
 185 HANDLE _Jv_Win32GetInterruptEvent (void);
 186
 187 // Remove defines from <windows.h> that conflict with various things in libgcj code
 188
 189 #undef TRUE
 190 #undef FALSE
 191 #undef MAX_PRIORITY
 192 #undef MIN_PRIORITY
 193 #undef min
 194 #undef max
 195 #undef interface
 196 #undef STRICT
 197 #undef VOID
 198
 199 #endif /* __JV_WIN32_THREADS__ */