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 #include <windows.h>
  17
  18 //
  19 // Typedefs.
  20 //
  21
  22 typedef struct
  23 {
  24   // ev[0] (signal) is a Win32 auto-reset event for _Jv_CondNotify
  25   // ev[1] (broadcast) is a Win32 manual-reset event for _Jv_CondNotifyAll
  26   HANDLE ev[2];
  27
  28   // Number of threads waiting on this condition variable
  29   int blocked_count;
  30
  31   // Protects access to the blocked_count variable
  32   CRITICAL_SECTION count_mutex;
  33
  34 } _Jv_ConditionVariable_t;
  35
  36 typedef struct
  37 {
  38   // The thread-id of the owner thread if any, 0 otherwise
  39   DWORD owner;
  40
  41   // Track nested mutex acquisitions by the same thread
  42   int refcount;
  43
  44   // The actual Windows construct used to implement this mutex
  45   CRITICAL_SECTION cs;
  46
  47 } _Jv_Mutex_t;
  48
  49 typedef struct
  50 {
  51   int flags;            // Flags are defined in implementation.
  52   HANDLE handle;        // Actual handle to the thread
  53   java::lang::Thread *thread_obj;
  54 } _Jv_Thread_t;
  55
  56 typedef DWORD _Jv_ThreadId_t;
  57
  58 inline _Jv_ThreadId_t
  59 _Jv_ThreadSelf (void)
  60 {
  61   return GetCurrentThreadId();
  62 }
  63
  64 typedef void _Jv_ThreadStartFunc (java::lang::Thread *);
  65
  66 //
  67 // Condition variables.
  68 //
  69
  70 int _Jv_CondWait (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos);
  71 void _Jv_CondInit (_Jv_ConditionVariable_t *cv);
  72 void _Jv_CondDestroy (_Jv_ConditionVariable_t *cv);
  73 int _Jv_CondNotify (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *);
  74 int _Jv_CondNotifyAll (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *);
  75
  76 //
  77 // Mutexes.
  78 // We use CRITICAL_SECTIONs instead of CreateMutex() for better performance
  79 //
  80
  81 inline void _Jv_MutexInit (_Jv_Mutex_t *mu)
  82 {
  83   mu->owner = 0UL;
  84   mu->refcount = 0;
  85   InitializeCriticalSection (&(mu->cs));
  86 }
  87
  88 #define _Jv_HaveMutexDestroy
  89 inline void _Jv_MutexDestroy (_Jv_Mutex_t *mu)
  90 {
  91   mu->owner = 0UL;
  92   mu->refcount = 0;
  93   DeleteCriticalSection (&(mu->cs));
  94   mu = NULL;
  95 }
  96
  97 inline int _Jv_MutexUnlock (_Jv_Mutex_t *mu)
  98 {
  99   if (mu->owner == GetCurrentThreadId ( ))
 100     {
 101       mu->refcount--;
 102       if (mu->refcount == 0)
 103         mu->owner = 0UL;
 104       LeaveCriticalSection (&(mu->cs));
 105       return 0;
 106     }
 107   else
 108     return 1;
 109 }
 110
 111 inline int _Jv_MutexLock (_Jv_Mutex_t *mu)
 112 {
 113   EnterCriticalSection (&(mu->cs));
 114   mu->owner = GetCurrentThreadId ( );
 115   mu->refcount++;
 116   return 0;
 117 }
 118
 119 //
 120 // Thread creation and manipulation.
 121 //
 122
 123 void _Jv_InitThreads (void);
 124 _Jv_Thread_t *_Jv_ThreadInitData (java::lang::Thread *thread);
 125 void _Jv_ThreadDestroyData (_Jv_Thread_t *data);
 126
 127 inline java::lang::Thread* _Jv_ThreadCurrent (void)
 128 {
 129   extern DWORD _Jv_ThreadKey;
 130   return (java::lang::Thread *) TlsGetValue(_Jv_ThreadKey);
 131 }
 132
 133 inline _Jv_Thread_t *_Jv_ThreadCurrentData(void)
 134 {
 135   extern DWORD _Jv_ThreadDataKey;
 136   return (_Jv_Thread_t *) TlsGetValue(_Jv_ThreadDataKey);
 137 }
 138
 139 inline void _Jv_ThreadYield (void)
 140 {
 141   Sleep (0);
 142 }
 143
 144 void _Jv_ThreadRegister (_Jv_Thread_t *data);
 145 void _Jv_ThreadUnRegister ();
 146
 147 void _Jv_ThreadSetPriority (_Jv_Thread_t *data, jint prio);
 148 void _Jv_ThreadStart (java::lang::Thread *thread, _Jv_Thread_t *data,
 149                       _Jv_ThreadStartFunc *meth);
 150 void _Jv_ThreadWait (void);
 151 void _Jv_ThreadInterrupt (_Jv_Thread_t *data);
 152
 153 // Remove defines from <windows.h> that conflict with various things in libgcj code
 154
 155 #undef TRUE
 156 #undef FALSE
 157 #undef MAX_PRIORITY
 158 #undef MIN_PRIORITY
 159 #undef min
 160 #undef max
 161 #undef interface
 162 #undef STRICT
 163 #undef VOID
 164
 165 #endif /* __JV_WIN32_THREADS__ */