// win32-threads.cc - interface between libjava and Win32 threads. /* Copyright (C) 1998, 1999 Red Hat, Inc. This file is part of libgcj. This software is copyrighted work licensed under the terms of the Libgcj License. Please consult the file "LIBGCJ_LICENSE" for details. */ #include <config.h> // If we're using the Boehm GC, then we need to override some of the // thread primitives. This is fairly gross. #ifdef HAVE_BOEHM_GC extern "C" { #include <boehm-config.h> #include <gc.h> }; #endif /* HAVE_BOEHM_GC */ #include <gcj/cni.h> #include <jvm.h> #include <java/lang/Thread.h> #include <java/lang/System.h> #include <errno.h> #ifndef ETIMEDOUT #define ETIMEDOUT 116 #endif // This is used to implement thread startup. struct starter { _Jv_ThreadStartFunc *method; java::lang::Thread *object; _Jv_Thread_t *data; }; // Controls access to the variable below static HANDLE daemon_mutex; static HANDLE daemon_cond; // Number of non-daemon threads - _Jv_ThreadWait returns when this is 0 static int non_daemon_count; // TLS key get Java object representing the thread DWORD _Jv_ThreadKey; // TLS key to get _Jv_Thread_t* representing the thread DWORD _Jv_ThreadDataKey; // // These are the flags that can appear in _Jv_Thread_t. // // Thread started. #define FLAG_START 0x01 // Thread is daemon. #define FLAG_DAEMON 0x02 // // Condition variables. // int _Jv_CondWait (_Jv_ConditionVariable_t *cv, _Jv_Mutex_t *mu, jlong millis, jint nanos) { DWORD time; DWORD rval; // FIXME: check for mutex ownership? _Jv_MutexUnlock (mu); if((millis == 0) && (nanos > 0)) time = 1; else if(millis == 0) time = INFINITE; else time = millis; rval = WaitForSingleObject (*cv, time); _Jv_MutexLock (mu); if (rval == WAIT_FAILED) return _JV_NOT_OWNER; // FIXME? else return 0; } // // Mutexes. // int _Jv_MutexLock (_Jv_Mutex_t *mu) { DWORD rval; // FIXME: Are Win32 mutexs recursive? Should we use critical section objects rval = WaitForSingleObject (*mu, INFINITE); if (rval == WAIT_FAILED) return GetLastError (); // FIXME: Map to errno? else if (rval == WAIT_TIMEOUT) return ETIMEDOUT; else return 0; } // // Threads. // void _Jv_InitThreads (void) { _Jv_ThreadKey = TlsAlloc(); _Jv_ThreadDataKey = TlsAlloc(); daemon_mutex = CreateMutex(NULL, 0, NULL); daemon_cond = CreateEvent(NULL, 0, 0, NULL); non_daemon_count = 0; } _Jv_Thread_t * _Jv_ThreadInitData (java::lang::Thread *) { _Jv_Thread_t *data = new _Jv_Thread_t; data->flags = 0; return data; } void _Jv_ThreadDestroyData (_Jv_Thread_t *data) { delete data; } void _Jv_ThreadSetPriority (_Jv_Thread_t *data, jint prio) { int actual = THREAD_PRIORITY_NORMAL; if (data->flags & FLAG_START) { switch (prio) { case 10: actual = THREAD_PRIORITY_TIME_CRITICAL; break; case 9: actual = THREAD_PRIORITY_HIGHEST; break; case 8: case 7: actual = THREAD_PRIORITY_ABOVE_NORMAL; break; case 6: case 5: actual = THREAD_PRIORITY_NORMAL; break; case 4: case 3: actual = THREAD_PRIORITY_BELOW_NORMAL; break; case 2: actual = THREAD_PRIORITY_LOWEST; break; case 1: actual = THREAD_PRIORITY_IDLE; break; } SetThreadPriority(data->handle, actual); } } // This function is called when a thread is started. We don't arrange // to call the `run' method directly, because this function must // return a value. static DWORD __stdcall really_start (void* x) { struct starter *info = (struct starter *) x; TlsSetValue (_Jv_ThreadKey, info->object); TlsSetValue (_Jv_ThreadDataKey, info->data); info->method (info->object); if (! (info->data->flags & FLAG_DAEMON)) { WaitForSingleObject (daemon_mutex, INFINITE); non_daemon_count--; if (! non_daemon_count) PulseEvent (daemon_cond); ReleaseMutex (daemon_mutex); } return 0; } void _Jv_ThreadStart (java::lang::Thread *thread, _Jv_Thread_t *data, _Jv_ThreadStartFunc *meth) { DWORD id; struct starter *info; // Do nothing if thread has already started if (data->flags & FLAG_START) return; data->flags |= FLAG_START; // FIXME: handle marking the info object for GC. info = (struct starter *) _Jv_AllocBytes (sizeof (struct starter)); info->method = meth; info->object = thread; info->data = data; if (! thread->isDaemon ()) { WaitForSingleObject (daemon_mutex, INFINITE); non_daemon_count++; ReleaseMutex (daemon_mutex); } else data->flags |= FLAG_DAEMON; HANDLE h = CreateThread(NULL, 0, really_start, info, 0, &id); _Jv_ThreadSetPriority(data, thread->getPriority()); //if (!h) //JvThrow (); } void _Jv_ThreadWait (void) { WaitForSingleObject(daemon_mutex, INFINITE); if(non_daemon_count) SignalObjectAndWait(daemon_mutex, daemon_cond, INFINITE, 0); ReleaseMutex(daemon_mutex); } void _Jv_ThreadInterrupt (_Jv_Thread_t *data) { MessageBox(NULL, "Unimplemented", "win32-threads.cc:_Jv_ThreadInterrupt", MB_OK); // FIXME: }